Do I need a permit for a small shed or storage building?

Most sheds under 120 square feet are exempt from permits if they're not used for human occupancy and don't contain utilities. Anything larger, or any shed with electrical, plumbing, or HVAC, requires a permit. Even an exempt shed still needs to meet setback rules and foundation requirements — you can't place a 6x20 shed 2 feet from the property line without approval. Call the Building Department before you build.

What if I hire a contractor — do they pull the permit or do I?

The contractor typically pulls the permit; it's almost always their responsibility and part of the bid. You pay for it (it's rolled into the cost), but they file and manage inspections. Get the permit number in writing before work starts. If a contractor tells you the permit isn't necessary or suggests doing work 'without the paperwork,' that's a red flag — find a different contractor.

How long does a typical Denver permit take from application to final inspection?

Routine permits (fences, decks, electrical subpermits) typically take 2-3 weeks for plan review plus 1-2 weeks for scheduling inspections — total 3-4 weeks from submission to final approval. More complex projects (additions, basement remodels) run 4-6 weeks for plan review alone. If the Building Department rejects plans and asks for revisions, add another 1-2 weeks.

What happens if I do work without a permit?

If the Building Department finds out — through a complaint, a sale, an insurance claim, or a property inspection — they'll issue a stop-work order and require you to get the work inspected retroactively. Unpermitted work can fail inspection if it doesn't meet code, which means you'll have to tear it out and redo it. More immediately, unpermitted work can void your homeowner's insurance claim if there's a loss (fire, wind damage, injury). If you're selling, the buyer's title company or appraiser will often flag unpermitted work and require it to be permitted or bonded. Do it right the first time — the permit fee is a fraction of the cost of remediation.

Are there projects I can do without a permit in Denver?

Very few. Interior painting, drywall finishing, flooring, and landscaping under 4 feet don't require permits. Fences under 6 feet in rear yards, and ground-level patios without footings, are sometimes exempt — but check with the Building Department first because setbacks still apply. Anything structural, anything involving the foundation, electrical, plumbing, HVAC, roofing, or any change to the exterior envelope requires a permit. When in doubt, a 5-minute call to the Building Department costs nothing and saves weeks of headache later.

My deck or foundation is cracking — do I need a permit to repair it?

Repairs are often exempt, but if the repair involves structural changes or you're replacing more than 25% of the original work, a permit may be required. Concrete spalling or small cracks can be patched without a permit. Replacing deck boards or re-fastening joists usually doesn't need a permit. Replacing the entire foundation system or reinforcing structural elements does. When in doubt, get a contractor to assess and ask the Building Department whether your specific repair needs a permit.

Does Denver require permits for roof replacement?

Yes. Any roof replacement or new roof installation requires a permit, regardless of size. The Building Department inspects for proper fastening, uplift resistance (Denver's wind loads are real), flashing details, and ventilation. Expect one inspection at completion. If you're also upgrading insulation or venting, expect a second inspection for energy code compliance.

Building Permits in Denver, CO (2026)

Do I need a permit in Denver, Colorado?

Denver's permit system is straightforward on paper but has real local quirks that catch homeowners off guard. The City of Denver Building Department administers permits for all residential work within city limits, and they're reasonably efficient — most routine permits move through in 2-3 weeks. But Denver's unique geography and soil conditions create extra requirements that don't exist in flatter, more stable regions. The Front Range sits at 5,300 feet elevation with 30-42 inch frost depths and expansive bentonite clay that shifts seasonally. That means deck footings, basement foundations, and retaining walls all need engineering or careful design to avoid cracking and settling. The Building Department has seen decades of frost-heave damage and soil movement — they enforce the rules hard because they work. Colorado's 2021 Code Update (based on the 2018 International Building Code) is the current standard adopted by Denver, with state amendments for wind loads and seismic risk. If you're planning any structural work, water-related work, electrical, plumbing, HVAC, or anything involving the foundation, you'll almost certainly need a permit. Even modest projects like decks, fences, and sheds often trigger permits here. The safe assumption is that if you're changing the structure or systems of your home, you need to call the Building Department first.

What's specific to Denver permits

Denver's expansive clay is the single biggest reason permits exist here. Bentonite clay swells when wet and shrinks when dry — sometimes moving several inches vertically over a season. Decks, patios, retaining walls, and foundations all fail faster in Denver than in stable-soil regions if they're not designed for that movement. The Building Department requires footing depths of 42 inches minimum on the Front Range (deeper than the standard IRC 36 inches) to get below the frost line and seasonal clay movement. If you're adding a deck, shed, or any structure with footings, expect the Building Department to ask for a footing depth calculation or a soils report. Many homeowners try to get away with 36-inch footings and get rejected at inspection. Plan for 42 inches and you'll pass the first time.

Denver's elevation and wind exposure create additional requirements that don't exist in lowland areas. Seismic design requirements are moderate but real — deck fastening, roof bracing, and foundation connections are scrutinized more closely than in some states. Wind loads also run higher than IRC baseline because of the Front Range's exposure. If you're replacing a roof, adding an addition, or building a deck, the engineered plans will reflect Denver-specific loads. Don't use a generic deck design from the internet; get plans that account for Denver's frost depth and wind.

The City of Denver uses an online permit portal (accessible through the Denver city website) for intake, fee payment, and status checks. Most routine permits can be uploaded and paid online; some complex projects still require in-person submission. Plan-check turnaround is typically 2-3 weeks for standard residential work, though complex projects with structural engineering can take 4-6 weeks. If the Building Department rejects your plans for missing information, the clock resets. Having a complete, locally-correct submission the first time saves 2-3 weeks.

Denver's permit fees are based on project valuation using a standard formula: 0.625% of project value for basic residential work, with a minimum fee of $75–$150 depending on project type. A $20,000 deck will run roughly $125–$300 in permit fees. A $5,000 fence runs $75–$100. Electrical, plumbing, and mechanical subpermits are filed separately and add $50–$200 each. Inspection fees are bundled into the permit fee — no surprise charges when the inspector shows up.

One common rejection point: site plans without clear property-line dimensions. The Building Department needs to verify setbacks, especially in corner lots and tight urban yards. Before you submit, get a survey or at minimum a property deed with clear dimensions. If your site plan is vague about where the structure sits relative to property lines, expect a rejection and resubmission cycle.

Most common Denver permit projects

These are the projects Denver homeowners tackle most often. Each has its own permit track, inspection sequence, and local gotchas. Click through to the detailed guide for your project.

Decks

Any deck over 200 square feet or more than 30 inches above grade requires a permit. Denver's 42-inch frost depth and expansive clay make footing design critical — generic plans fail here. Expect plan review for frost depth and soil bearing capacity.

Fences

Wood fences under 6 feet in rear yards are often exempt, but masonry walls over 4 feet, corner-lot fences, and retaining walls over 4 feet all require permits. Denver's clay means retaining walls need drainage design — you'll need a plan.

Electrical work

Adding circuits, replacing panels, installing new outlets, or upgrading service all require electrical permits and inspection. NEC 2020 applies (Colorado's current code). Most electricians pull the permit; some homeowners do it themselves.

HVAC

New furnace, AC, or heat pump installations require mechanical permits. Ductwork relocation and ventilation redesign also need approval. Denver's high elevation means HVAC sizing calculations must account for thinner air and lower capacity.

Room additions

Any structural addition requires a full permit with site plan, foundation design, electrical and plumbing layout, and energy-code compliance. Plan review runs 4-6 weeks. Foundation work will be scrutinized for frost depth and soil conditions.

Basement finishing

Converting an unfinished basement to living space triggers permits for egress windows, HVAC, electrical, plumbing, and ceiling height. Denver's high water table and clay soil mean foundation drainage and sump-pump placement get scrutinized. Expect at least 3 inspection points.

Do I need a building permit in Denver, CO?