A permanent shipping container structure usually requires a building permit. The threshold depends on three things: what you're using it for (storage, workspace, dwelling, etc.), whether it sits on a permanent foundation, and whether it will have utilities like electricity or plumbing. A single 40-foot container used as detached storage on a concrete pad might be exempt in some jurisdictions; the same container as a permitted dwelling unit or with electrical service almost certainly requires a permit everywhere. The IRC R105 requires a permit for any permanent building or structure, with limited exemptions for detached accessory buildings under a certain size threshold that varies by jurisdiction. Shipping containers blur the line between "structure" and "building" — local zoning and building departments interpret them differently based on intended use and how they're built. Before you order a container or pour a foundation, spend 15 minutes on the phone with your local building department to confirm the permit path. You'll save money and avoid a tear-down order later.
When shipping container structures require permits
The permit decision hinges on three variables: use, foundation, and utilities. A shipping container used purely for storage on a temporary pad (no permanent foundation) might fall into an exemption for detached accessory structures — but only if your local code allows detached accessory buildings, limits their size (typically under 200 square feet or 120 square feet in some jurisdictions), and excludes any utility connections. The moment you pour a concrete foundation, add a permanent connection to the ground, or integrate utilities, you've triggered the permit requirement. Most jurisdictions have no explicit "shipping container" rule — instead, they apply their standard building code to containers as though they were any other structure.
Foundation type matters more than the container itself. A container sitting on concrete piers or a graded pad without permanent anchor bolts might qualify as a non-permanent structure in some interpretations — though this is aggressive and depends entirely on local code. A container bolted to a concrete slab or footer that extends below the frost line (per IRC R403.1 — typically 36 to 48 inches depending on climate zone) is clearly a permanent building. Your frost depth varies by region: the northern U.S. (Minnesota, Wisconsin, Michigan) freezes 48 inches or deeper; mid-Atlantic states run 30 to 36 inches; southern zones may be 12 inches or less. A permanent foundation triggers the building permit immediately.
Utilities push the project firmly into permit territory. Any electrical service — even a single 120-volt outlet wired from your house — requires a separate electrical subpermit and inspection under the National Electrical Code (NEC). Plumbing (water, sewer, gas) triggers a plumbing permit and inspections under the International Plumbing Code (IPC). HVAC or permanent heating/cooling adds mechanical permits. Lump all three utilities into one project and you're looking at four separate permit applications (building, electrical, plumbing, mechanical) with separate fees and inspections. The good news: most building departments process these as bundles on the same project application, and a professional contractor typically files them all at once.
Zoning adds another layer. Even if your container meets building code, your local zoning ordinance must allow it. Residential zones often prohibit industrial containers or limit them to a secondary structure on a certain percentage of lot coverage. Commercial and light-industrial zones are more flexible. Some progressive jurisdictions (Austin, Portland, parts of California) have relaxed zoning for container structures as affordable housing; others (wealthy suburbs in the Northeast and Midwest) ban them outright or require design reviews. Check your zoning code before pouring the foundation. A $5,000 foundation on a container that violates zoning is a tear-out waiting to happen.
The exemption for detached accessory buildings is narrow and worth understanding. Most codes exempt detached structures under a floor-area threshold (often 200 square feet, sometimes 120 square feet) if they're single-story, have no utilities, are located outside certain setback zones (typically 5 feet from side and rear property lines), and serve an accessory purpose (storage, greenhouse, garden shed) rather than a primary dwelling or business use. A single 20-foot shipping container is roughly 160 square feet interior — it could theoretically qualify as exempt if all other conditions align. But the moment you add utilities, increase the height (containers are about 8 feet 6 inches tall; taller stacking or alterations count), or use it for non-accessory purposes, the exemption vanishes. Call the building department and ask for the specific exemption criteria in writing. Don't guess.
Code sections you'll encounter: IRC R105 (general permit requirement), IRC R301 (design loads and assumptions), IRC R403 (footings and foundations — frost depth is set here), IRC R608 (exterior walls — shipping containers need structural verification that the steel frame remains intact and load-bearing), local zoning ordinance (setbacks, lot coverage, permitted uses), and the International Building Code (IBC) if your jurisdiction adopts it (many larger cities do). Some states and municipalities have adopted supplements or amendments specifically addressing container buildings — California, for instance, recognizes shipping containers under certain conditions if they meet structural and safety requirements. Your state or city building department website will list which code edition they've adopted; start there.
How shipping container permits vary by region
The most permissive jurisdictions are those actively encouraging container-based housing or workspace: Austin, Texas; Portland, Oregon; San Francisco Bay Area; and parts of Denver and Los Angeles have relaxed or streamlined container permits under inclusionary housing or affordable-workspace policies. Austin allows containers as dwelling units if they meet structural engineering and energy-code requirements; Portland has adopted specific zoning allowances for container structures in certain zones. These cities still require permits, but the path is well-defined and fees are competitive. If you're in a progressive metro area, check if your city has a published container-dwelling ordinance — if so, follow it exactly and the permit should flow smoothly.
Cold-climate jurisdictions (Minnesota, Wisconsin, Michigan, upstate New York, Pennsylvania) focus heavily on foundation depth and weatherproofing. Frost depths run 48 inches or deeper; footings must extend below that line, and containers must be fully insulated and sealed per the local energy code (often the IECC — International Energy Conservation Code). Some northern municipalities require a structural engineer's assessment of container load-bearing capacity after modification, especially if you've cut openings for doors or windows. Plan 3 to 4 weeks for review in these regions, and budget $300 to $800 for the permit depending on container size and foundation scope.
Coastal and hurricane-prone regions (Florida, coastal Carolinas, Gulf Coast, parts of California) impose wind and seismic requirements. Florida Building Code, 8th Edition, treats containers as non-residential structures and subjects them to wind loads up to 160 mph depending on location within the state. Containers must be engineered, anchored to footings with specified fasteners, and inspected before and after installation. Coastal California requires seismic design review for any permanent structure. These requirements significantly increase project cost (structural engineering is mandatory, not optional) and timeline (8 to 12 weeks for plan review). Expect permit fees of $400 to $1,200 and structural engineering costs of $1,500 to $3,500.
Conservative suburban and wealthy residential areas (much of the Northeast, wealthy Midwest suburbs, affluent California neighborhoods) often impose strict design-review requirements or prohibit industrial-looking structures outright. Even if zoning technically allows a container, your local architectural or design-review board may reject it on aesthetic grounds. These jurisdictions sometimes require container exteriors to be clad, screened, or substantially modified to look residential — which defeats the purpose for many users. Call your building department and zoning office before investing in the project; a negative preliminary response saves you time and heartbreak.
Common scenarios
Single 40-foot container for storage on a gravel pad, no utilities, 8 feet from rear property line
This scenario sits in the exemption gray zone. If your jurisdiction's code exempts detached accessory structures under 200 square feet with no utilities and it's positioned outside required setbacks, you may not need a permit. A 40-foot container is roughly 320 square feet (too large), but a 20-foot container is roughly 160 square feet (possibly under the threshold). However, a "gravel pad" is not a permanent foundation, which helps your case — but if you ever add a concrete footer or bolt the container down with anchor bolts, it becomes a permanent structure and a permit becomes mandatory. Call your building department and describe the exact scenario: container size, intended use, location on your lot, and foundation type. Ask for the exemption criteria in writing. Some jurisdictions will waive the permit for a storage container under 200 square feet on a non-permanent pad in an accessory location; others will require a permit for anything permanent. Don't assume — ask.
Single 20-foot container with permanent concrete foundation, single door opening cut in side, used as a workshop with one 120-volt outlet added by licensed electrician
This is a clear permit requirement. You have a permanent foundation (concrete pad with or without frost-depth footer — either way, it's permanent), you've modified the structure (door opening requires structural assessment to ensure the container's load-bearing frame is intact), and you have electrical service (even one outlet requires a separate NEC-compliant electrical subpermit). Plan to file: (1) a building permit for the foundation and structure, including structural drawings showing the door opening and verification that the container remains load-bearing, (2) an electrical subpermit for the 120-volt circuit. The building permit will require footing depth below your local frost line (check with your building department), setback compliance per your zoning code, and a site plan showing lot lines and container placement. The electrical permit will require the electrician to file; they'll need the building permit number. Cost: $200 to $400 for the building permit (depending on whether plan review is required), $75 to $150 for the electrical subpermit. Timeline: 2 to 4 weeks depending on whether your building department fast-tracks over-the-counter approvals or requires plan review.
Two stacked 20-foot containers on a permanent foundation in a coastal area (Miami, FL), used as retail/office space with electricity, plumbing for a small bathroom, and HVAC
This is a major permit project. You have stacked containers (doubles the complexity), a coastal location (Florida Building Code wind and seismic requirements apply), permanent foundation, utilities (electrical, plumbing, mechanical), and commercial use. Filing requirements: (1) a building permit with a structural engineer's calculations showing container load capacity, stacking safety, foundation design per Florida frost depth (roughly 12 inches, but wind-uplift anchoring is the real driver), (2) an electrical subpermit with a single-line diagram, (3) a plumbing subpermit with fixtures and drains, (4) a mechanical subpermit for HVAC. You will need a registered Florida engineer to stamp all structural and MEP drawings. Plan review in Miami or another coastal Florida jurisdiction typically takes 6 to 12 weeks due to wind-code scrutiny. Costs: $600 to $1,200 for the building permit, $150 to $300 for each trade subpermit, plus $2,000 to $4,000 for structural engineering. Inspections: footing, framing/stacking, electrical rough-in, plumbing rough-in, final. This is not a DIY permit project — hire a permit expediter or contractor experienced in commercial container builds in your region.
Single container on a permanent foundation as a residential dwelling unit (accessory dwelling unit or ADU) in an urban jurisdiction that allows it, with electricity and plumbing
A container as an ADU is permitted in cities like Austin, Portland, and San Francisco if it meets specific ordinance requirements — but it requires a full residential building permit, not a simplified accessory structure exemption. You must file: (1) a building permit with architectural/structural drawings showing the container's load-bearing integrity, insulation/energy-code compliance, and egress (windows or doors meeting emergency-exit requirements per IRC R310.1), (2) electrical and plumbing subpermits, (3) potentially a design-review permit if your city requires architectural review for ADUs. A residential container also needs to meet energy code (IECC) — containers are poor insulators and you'll need substantial thermal upgrades (interior framing, insulation, air sealing) to pass. Plan review takes 4 to 8 weeks in ADU-friendly cities (they're used to them); structural engineering and energy modeling will cost $2,000 to $5,000. Permit fees: $400 to $800 for the building permit, $150 to $300 for electrical, $150 to $300 for plumbing. This project typically requires a licensed architect or engineer to prepare plans — don't attempt it without professional design help.
Replacing an existing container structure with an identical new one in the same location (same foundation, no new utilities)
This hinges on whether the original structure had a permit and what the local code says about replacements. If the original container was permitted and the new one is truly identical (same size, same location, no modifications, no new utilities), some jurisdictions allow a simplified or expedited replacement permit at a reduced fee ($50 to $100). Others require a full new permit as though it were a new construction. If the original was never permitted, you have two paths: (1) file a new permit for the replacement (and the city may not care that the original was unpermitted, or it may flag it as a violation), or (2) continue without permitting and risk a violation notice if someone complains or an inspector happens to investigate. Call your building department and describe the situation honestly — original structure, current status, replacement plan. They'll tell you whether a simplified path exists. If you can get a copy of the original permit, attach it to your new application and reference it. That makes the case for expedited review.
Documents you'll need and who files them
| Document | What it is | Where to get it |
|---|---|---|
| Site plan / Plot plan | A drawing showing your lot boundaries, property lines, setbacks, and the location of the container on the lot with dimensions to the property line and existing structures. Scale typically 1/4 inch = 1 foot or smaller. | Your architect, surveyor, or a permit-expediting service can prepare it from your property deed and a site visit. Many building departments accept a simple hand-drawn sketch if dimensions are accurate; call first and ask for requirements. |
| Structural drawings / Container certification | Drawings or engineer's letter confirming the shipping container's load-bearing capacity, foundation design, any modifications (door/window openings, interior framing changes), and how the container is anchored. If the container is unmodified, a manufacturer's specification sheet plus a brief engineer's letter may suffice. If you're cutting openings or stacking, full stamped drawings are required. | A licensed structural engineer or architect stamps these. For an unmodified single container, cost is typically $500 to $1,000; for stacked or heavily modified containers, $2,000 to $5,000+. Some container suppliers provide baseline structural documentation; start with them. |
| Foundation / Footing drawings | Details showing how the container sits on the ground: concrete slab thickness, reinforcement, frost depth, anchor bolt locations and specifications, and drainage. IRC R403 and local frost-depth requirements drive these details. | Your structural engineer or architect prepares this based on your building department's frost-depth requirement (call and ask for it by address or ZIP code). A simple detail sheet is often enough for an over-the-counter permit; major projects may need full footing plans. |
| Electrical drawings / Electrical plan (if utilities included) | A one-line diagram showing the power source, breaker/disconnect, circuit layout, and outlet/fixture locations. Must comply with NEC (National Electrical Code). Typically one page. | A licensed electrician prepares and files this as part of the electrical subpermit application. The electrician typically provides this to the building department; you don't file it separately. |
| Plumbing plan (if water/sewer/gas included) | A layout showing fixture locations, supply and drain lines, size, material, and connection points to the main water and sewer lines. Driven by IPC (International Plumbing Code). | A licensed plumber prepares this as part of the plumbing subpermit. Again, the plumber files it; you don't. |
| Energy code compliance (residential only) | If the container is a dwelling unit, you'll need documentation that the insulation, windows, doors, and air sealing meet your local energy code (IECC). Typically a summary sheet or inspection checklist. | Your architect or an energy consultant prepares this. In some jurisdictions, a simple signed statement from the contractor suffices; in others, a third-party energy audit is required. |
Who can pull: You can file for a building permit as the property owner in most jurisdictions. However, if the project includes electrical, plumbing, or mechanical systems, those subpermits must be filed by a licensed contractor in that trade — the electrician files the electrical permit, the plumber files the plumbing permit, etc. If you're acting as the general contractor and pulling multiple trades, you'll file the building permit and then coordinate with the trades to file their subpermits. Many building departments allow you to submit all applications at once (building + trades) on the same day. If you're hiring a single contractor to oversee the project, they typically handle all permit filings on your behalf and bill you for permit costs plus their expediting fee (typically $200 to $500).
Why shipping container permit applications get rejected
- Site plan missing or incomplete — no property-line dimensions, setback violations not addressed, or container placement unclear.
Redraw the site plan at scale with clear dimensions from the container to all four property lines, to the nearest structure, and to any utility easements. Show setback requirements from your local zoning code and confirm the container complies. Many rejections clear up with a corrected site plan in 2 days. - Structural drawings missing or inadequate — no verification that container modifications (doors, windows, openings) don't compromise load-bearing capacity.
If the container is unmodified, provide the manufacturer's spec sheet and a brief engineer's letter confirming structural adequacy. If you've cut openings, get a structural engineer to calculate whether the remaining frame is adequate. This is not optional for openings larger than a window — the building department will flag it and you'll have to hire an engineer anyway. Do it up front. - Footing depth insufficient for local frost line — foundation design doesn't account for local frost depth or includes no footer at all.
Call your building department and ask for the frost depth at your specific address (or ZIP code). Verify that your foundation design (concrete slab, frost-depth footer, etc.) meets or exceeds that depth. Typical northern locations run 36 to 48 inches; southern zones may be 12 to 18 inches. Redraw the footing detail and resubmit. This is a common fix. - Zoning violation — container doesn't meet setback, height, lot-coverage, or use restrictions in your local zoning code.
Pull a copy of your zoning ordinance from your city website or planning department. Find the section for your zoning district (e.g., Residential, Commercial) and confirm the container complies with setback (distance from property lines), height, lot coverage, and permitted uses. If it doesn't, you have two choices: move it, shrink it, or file for a variance or conditional-use permit (which adds 4 to 12 weeks and costs $200 to $500). Call the building or planning department before resubmitting — they'll tell you if a variance is realistic. - Trade subpermits missing or misfiled — electrical or plumbing permits not submitted, or submitted under the wrong permit type.
Confirm all subpermits (electrical, plumbing, mechanical, HVAC) are filed under the correct permit type for your jurisdiction. Some cities have a single 'electrical' permit type; others distinguish between 'service installation' and 'electrical work.' Call the permit desk and ask for the correct permit type for each trade. Resubmit with the right type. If a trade subpermit is missing, the building permit will be put on hold until it's filed — expect a rejection notice or courtesy call asking you to file it. - Energy code non-compliance (residential) — insulation, window, or air-sealing details missing or insufficient.
For a residential container (ADU, dwelling), you must show compliance with your local energy code (IECC + state/local amendments). Specify R-values for walls, roof, and foundation; U-values or SHGC for windows; air-sealing approach. If the building department rejects it as non-compliant, hire an energy consultant to model the design and provide a compliance report. This typically costs $500 to $1,500 and resolves most energy-code rejections.
Shipping container permit costs
Permit fees vary widely by jurisdiction and project scope. A single container used as unheated storage with no utilities in a permissive jurisdiction might cost $75 to $150 for a simplified or expedited permit. A residential container ADU with full utilities in a coastal area can run $800 to $2,000 in permit fees alone, plus structural engineering ($2,000 to $5,000), footing and site work ($1,000 to $3,000), and utility hookup ($2,000 to $5,000 for electrical, plumbing, HVAC combined). The permit fee itself is usually based on project valuation — jurisdictions use either a flat fee ($75 to $300 for simple accessory structures) or a percentage of valuation (typically 1.5% to 2% of construction cost). A $15,000 project might be assessed as $15,000 × 1.5% = $225 permit fee; a $50,000 residential conversion might be $50,000 × 2% = $1,000. A few progressive jurisdictions offer expedited processing or waivers for container projects in certain zoning districts — ask your building department if any apply. Most jurisdictions charge separate fees for each trade subpermit (electrical, plumbing, mechanical), typically $75 to $200 each. Plan review fees are sometimes bundled into the base permit fee and sometimes charged separately ($50 to $200 for over-the-counter review, $200 to $500 for more complex projects). Final inspections are included in the permit fee.
| Line item | Amount | Notes |
|---|---|---|
| Simple storage container (single, no utilities, exempt) | $0–$150 | Many jurisdictions exempt detached storage structures under 200 sq ft with no utilities. Some still charge a nominal land-disturbance or notification fee. |
| Single container, permanent foundation, no utilities | $150–$400 | Based on flat fee or 1.5% of construction cost. Includes footing and structure review but no trade subpermits. |
| Single container with electrical service | $50–$150 (electrical subpermit only) | Building permit fees above + separate electrical subpermit. Electrician typically files; cost is on top of building permit. |
| Single container with plumbing | $75–$200 (plumbing subpermit only) | Building permit above + separate plumbing subpermit. Plumber files. Cost depends on fixture count and complexity. |
| Single container as ADU (residential, all utilities) | $400–$1,200 (permits) + $2,000–$5,000 (structural engineering) | Building permit ($400–$800) + electrical ($75–$150) + plumbing ($100–$200) + design review ($200–$400 if applicable). Engineering is mandatory for residential. |
| Stacked or heavily modified containers (commercial, utilities) | $800–$2,000 (permits) + $2,000–$5,000 (engineering) | Coastal/hurricane-prone areas add 50–100% premium. Plan review often required (4–12 weeks). Stacking doubles structural complexity. |
Common questions
Can I put a shipping container on my property without a permit?
Only if it meets your jurisdiction's exemption criteria, which is narrow. Most permanent containers require a permit. Detached accessory structures (storage sheds, garden structures) under a certain square footage with no utilities and proper setbacks are sometimes exempt — typically under 200 square feet, single-story, at least 5 feet from side and rear property lines. But the moment you add a permanent foundation (concrete footer), utilities, or use it for non-accessory purposes, the exemption is gone. Call your building department and ask for the exemption criteria for detached structures in writing. If your container doesn't clearly fit, file for a permit. The cost is low (usually under $300); the risk of a violation notice or tear-down order is high if you skip it.
Do I need a structural engineer for a standard, unmodified shipping container?
Not always. If the container is unmodified (no openings, no interior demolition, no stacking) and sits on a basic concrete pad in a non-coastal area, many building departments accept the manufacturer's spec sheet plus a brief letter from a professional confirming structural adequacy. The cost is under $500. However, if you're cutting doors, windows, or large openings, stacking containers, modifying the interior frame, or building in a coastal/seismic area, a full structural engineer's design is mandatory — expect $2,000 to $5,000. Don't try to skip this step if your building department flags it; they'll reject the permit and you'll have to hire an engineer anyway. Build engineering costs into your project budget from the start.
What if my container is in a flood zone or near wetlands?
Flood zones add significant complexity. If your property is in a FEMA 100-year flood zone, the container's lowest floor (including any foundation or pads) must be elevated above the base flood elevation per local floodplain ordinance and the International Building Code (IBC). This typically means a raised concrete pad or piers, not a ground-level slab. Wetland proximity is governed by your state and the Army Corps of Engineers — you may need a wetland delineation and permit before you can disturb the site. Call your building department and your state's environmental or wetland agency (check your state DEC, DNR, or equivalent). These projects take 6 to 12 weeks to permit and add $2,000 to $10,000 in site work costs. Don't start excavation or foundation work until you have written approval.
Can I connect a container to my house as a lean-to or addition?
Yes, but it's a different permit classification — it becomes an addition to your primary structure, not a detached building. This requires a building permit for the addition, including new foundation design, utility integration (which ties into your home's electrical and plumbing systems), and energy-code compliance for the connected area. You'll also need to verify that adding the container doesn't exceed your lot's maximum lot coverage or create a setback violation for the new footprint. Structural connection between the container and house frame must be engineered. Plan for a standard building-addition permit (2 to 4 weeks) plus electrical and plumbing subpermits. Cost: $300 to $800 permit fees + structural engineering ($1,500 to $3,000). This is more involved than a detached container, so get a contractor or architect involved early.
How long does a shipping container permit take to get approved?
Simple permits (single, unmodified storage container with no utilities and no plan-review required) can be approved over-the-counter in 1 to 3 days. Permits that require plan review (modified containers, utilities, residential use, stacking) typically take 2 to 4 weeks in a typical jurisdiction, sometimes up to 8 weeks in busy cities or coastal areas with stricter review. Residential containers (ADUs) and coastal/hurricane-zone projects run 4 to 12 weeks due to design-review requirements and engineering scrutiny. Permitting timeline does not include construction time — once you have approval, you still need to schedule inspections (footing, framing, electrical/plumbing rough-in, final) which happen during construction. Always call your building department and ask: 'What's your typical review time for [your project type]?' They'll give you an honest estimate.
What inspections are required for a shipping container?
This depends on your project scope. A simple foundation-only project has one inspection: footing/foundation. Add a container and you'll have a framing/structural inspection (inspector verifies the container is properly anchored and unmodified openings are reinforced). Electrical systems trigger a rough-in inspection (before drywall/finish) and a final inspection. Plumbing requires a rough-in (before walls close) and final. Some jurisdictions also require a pre-foundation inspection to verify that the site is properly prepared and frost depth is marked. Expect 3 to 5 inspections over the course of construction. Your building department or permit staff will give you a detailed inspection checklist when you pick up your permit; follow it carefully. Missing an inspection can halt your project until it's scheduled and passed.
Do I need insurance or a bond to get a container permit?
For a residential dwelling container, your homeowner's insurance will need to be updated to reflect the new structure — call your agent once the permit is issued. Some insurers charge a small premium increase; others don't. For a commercial project, your contractor's general liability insurance should cover container construction, and the building department may ask to see proof of insurance before issuing the permit. Most jurisdictions don't require a performance bond for small container projects (under $25,000), but large or complex projects may trigger a surety or performance bond requirement (typically 5–10% of project cost). Call your building department and ask if a bond is required for your scope. Don't be surprised if the answer is yes — plan for it in your project budget.
What happens if I build the container structure without a permit?
You risk a violation notice, which typically includes a stop-work order and demand that you either obtain a permit immediately or demolish the structure. If the city or county issues a violation, you'll owe fines (typically $100 to $500 per day of violation), and you'll be required to bring the structure into compliance retroactively. Retroactive permits are sometimes harder and more expensive than doing it right the first time — the building department will demand more inspections, structural certifications, and documentation because you built without oversight. You may also face issues selling the property; title companies and lenders often require proof that permanent structures are permitted and inspected. Some violation situations end in a settlement where you pay fines and file a retroactive permit; others end in demolition. Don't risk it. The permit costs $150 to $500 and takes 1 to 4 weeks. A violation costs far more in fines, engineering, and headaches. File before you build.
Get a straight answer on your shipping container project
Shipping container permits depend on what you're building, where you're building it, and what utilities you're adding. Your best first move is a 10-minute phone call to your local building department. Tell them: (1) the container size and intended use (storage, workspace, dwelling, etc.), (2) the lot address and zoning, (3) whether you're pouring a permanent foundation, and (4) whether you'll have electricity or plumbing. Ask them directly: Do I need a permit? If yes, what documents do I file, what's the fee, and what's the typical review time? If they're unsure, ask for the supervisor or the code official — they'll clarify. Most jurisdictions have website contact info and online permit applications; start there. Write down the answers (with the staffer's name if possible) and keep them handy as you move forward. If you want a second opinion or help preparing drawings, a permit expediter or local architect can review the department's feedback and handle the filing for you, usually for $200 to $500. Don't pay for engineered drawings or site work until you have written permit approval — it's not a wasted step, it's the one step that prevents wasted money.
Related permit guides
Other guides in the Additions & conversions category: