A beam or header installation can mean anything from sistering a new joist next to an existing one to removing an entire load-bearing wall and installing a steel beam in its place. The permit requirement depends almost entirely on what you're replacing, whether the work is engineered, and whether you're adding new support posts. A like-for-like replacement of a damaged beam using the same material and span typically doesn't need a permit. A new opening through an exterior wall, a removal of a load-bearing wall, or any beam that requires engineered calculations almost always does. The IRC R105 outlines when structural work triggers a permit; the state and local amendments often add or tighten those rules. Most building departments treat beam work as a structural project, which means it needs either a licensed structural engineer's stamp or, in some jurisdictions, proof that the span and loads are within prescriptive limits. If you're removing any wall or adding support columns, get a permit application in before you demo anything. Work without a permit on a load-bearing element can trigger expensive corrections, reinspection fees, and title issues when you sell.
When beams and headers require a permit
The threshold for a beam permit is structural work. If the beam carries load from above — whether it's roof, upper-floor, or ceiling joists — it's structural. The IRC R105.1 requires a permit for 'Work associated with the construction, alteration, or repair of buildings and structures' — which includes any beam that's part of the building's structural frame. In practice, three things trigger a permit: (1) The beam is engineered by a structural engineer; (2) The work involves new support posts or columns; or (3) The work requires removing or replacing a load-bearing wall. If none of those apply and you're doing a cosmetic repair (sistering a joist, splinting a damaged header with flashing and bolts as a temporary repair), some jurisdictions will let it go without a permit. Don't count on it. Call first.
Load-bearing walls are the critical distinction. A wall is load-bearing if it runs perpendicular to floor or roof joists and carries weight from above. Corner walls and walls running perpendicular to joists are almost always load-bearing; walls running parallel to joists might not be. If you're uncertain, assume it's load-bearing and file for a permit. Removing a load-bearing wall requires a new beam to support what the wall was carrying. That beam must be engineered — no exceptions. The structural engineer calculates the beam size, material (wood, steel, or LVL), depth, and required posts based on the loads above and the span. The engineer's stamp goes on the permit drawings; the building department reviews those calculations during plan review; and the inspector verifies installation during the inspection.
New support posts or columns also require a permit. A post isn't just a vertical member — it's a structural element that must be sized for the load, fastened correctly to the beam above and the foundation below, and inspected before it's covered. If you're adding a post under a new beam or moving an existing post to a new location, that's permit work. Some jurisdictions allow posts installed in basements or crawlspaces under smaller loads to be sized by table lookup from the code (IRC R502.3 for floor posts, for example) without an engineer's stamp. Most require an engineer for anything in a living space or supporting a large span.
Engineered work always needs a permit. If a structural engineer is involved — either because you hired one or because the code requires it — the engineer produces a set of calculations and drawings that must be submitted with the permit application. The engineer's seal certifies that the design meets the code. The building department reviews those calculations, approves them or asks for revisions, and then the work can start. This is not optional and not something you can skip or 'fast-track' around. No seal, no permit approval.
Like-for-like repairs can be exempt in some jurisdictions. If a floor joist is damaged by rot or impact and you're replacing it with a new joist of the same species, grade, and dimension in the same location with the same connections, some building departments classify that as a repair exempt under IRC R105.2 and local amendments. The word 'repair' matters — it means the work restores the existing structural capacity, not improving it. A sistered joist (new joist bolted alongside the existing one) is technically an upgrade, which tips it into remodel territory and may require a permit. Some departments have a threshold: repairs under $500 or $1,000 might be exempt; anything above that needs a permit. Others require a permit for any structural work. Check with your building department before assuming a repair is exempt.
Cosmetic work on beams — like exposing a hidden beam, painting it, or adding shiplap around it — doesn't require a permit if the beam itself isn't being altered structurally. If you're removing drywall to expose a beam, that's cosmetic. If you're removing a wall to expose a beam and that wall was load-bearing, that's permit work because you're affecting the structure. The distinction is whether the work changes the load path or removes a structural element.
How beam permit requirements vary by state and region
The IRC is the baseline, but states and some counties add their own rules. Florida requires all structural work to be designed by a licensed structural engineer or architect — no prescriptive sizing tables allowed. If you're installing a beam in Florida, it needs an engineer's seal, period. California Title 24 adds energy code requirements and has stricter rules on demolition and lateral bracing for beams in seismic zones. A steel beam in California may need to be braced differently than the same beam in Iowa. The 2021 IBC and 2021 IRC (adopted by many states) tightened the definition of 'load-bearing' and reduced some of the prescriptive table options, which means more projects now require engineered design.
Cold-climate states (Minnesota, Wisconsin, Michigan, upstate New York) often have amendments for frost depth and moisture issues. Wisconsin requires deck posts to go 48 inches below grade — that same frost depth applies to any new posts supporting a beam in a basement or crawlspace. These states also have strict rules on moisture barriers and vapor control, which affects how you install posts on concrete or treated lumber. Warm climates like Arizona and Nevada don't have frost-depth requirements, which can make post installation simpler, but they may have seismic or wind-design requirements that make the beam itself more complex.
Some states (like North Carolina) allow homeowners to pull permits for single-family detached homes without a licensed contractor on simpler projects, but structural work is almost always excluded. You'll need a licensed contractor or engineer to file. Other states (like New York) require a registered design professional for any wall removal. A few jurisdictions (notably some counties in Colorado and Utah) have adopted the 2024 IBC and have updated prescriptive tables for small-span beams that reduce the number of projects requiring engineered design. These updates flow down slowly, so always check your specific jurisdiction's code edition and amendments before assuming you can use a prescriptive table.
The permitting timeline also varies. High-growth areas (Phoenix, Austin, Atlanta) often have a 3- to 5-week plan-review backlog for structural work. Smaller jurisdictions (Bangor, Maine; Bismarck, North Dakota) might turn around a beam permit in 2 to 3 days. Seismic zones require additional peer review, which adds time. Florida's hurricane-zone requirement for structural review can add 1 to 2 weeks. When you call the building department, ask for the current plan-review timeline and whether there's an expedited option (some departments charge extra for 1-week turnaround).
Common scenarios
Replacing a rotted joist in a basement rim band with a new joist (no engineer, same size, same location)
This is the gray zone. The work is a repair — you're restoring the existing structural capacity — and many jurisdictions exempt repairs under a certain dollar threshold or certain conditions. However, some departments require a permit for any structural work, and some specify that repairs are only exempt if they're below 25% of the wall area or cost less than $500. Before you buy the joist, call your building department and describe the scope: one rotted joist, same species and dimension, same connections as the original. Ask explicitly: do you need a permit? Get the answer in writing via email, and keep that email. If the department says no permit, you're covered. If it says yes, you'll need to file a simple repair permit — usually $50 to $150 — and have an inspection before and after the work.
Removing a load-bearing wall in a first-floor kitchen to open it to the living room, replacing it with a new steel beam
This is a textbook structural permit. You're removing a load-bearing element, so the new beam must be engineered to carry the floor load and the portion of the roof load above it. Step 1: Hire a structural engineer. They'll calculate the beam size, posts, and foundation requirements ($800 to $2,500 depending on complexity). Step 2: The engineer produces calculations and a set of construction drawings showing the beam, posts, footings, connections, and temporary support. Step 3: You file a structural permit application with the engineer's drawings and stamp. The application fee will be $150 to $500, likely based on the valuation of the project. Step 4: Plan review takes 2 to 4 weeks (more in high-volume areas). The department will either approve the drawings or ask for revisions. Step 5: Once approved, you get a permit card and can begin. You'll need a temporary-support inspection before you remove the wall, a framing inspection during beam installation, and a final inspection. The entire process from engineer hire to final inspection is typically 6 to 12 weeks.
Adding a 6x6 post under an existing beam in a basement to support a sagging floor, beam is not being altered
Adding a new post is structural work and requires a permit. Even though you're not changing the beam, you're adding a structural element that must be sized and installed correctly. The post must transfer load from the beam to the foundation, and the foundation must be adequate to receive it. If the engineer determines the post can be sized from the code's prescriptive tables (IRC R502.3 or similar), you might not need an engineer's stamp — some jurisdictions will accept the contractor's responsibility. Most will require either an engineer's stamp or a detailed calculation sheet prepared by a licensed designer. The footings must be dug to frost depth (if required in your climate) and inspected before concrete is poured. A post in a basement under a sagging floor also suggests the original structure is moving or failing, which may trigger a larger investigation by the building department. File the permit early and have the inspector visit before any demo work to assess the current condition. Permit fee is typically $75 to $250.
Sistering a new 2x12 joist next to an undersized 2x10 joist to strengthen a floor, no engineer, both joists remain in place
Sistering is an upgrade to the structural capacity, which means it's remodel work and requires a permit in most jurisdictions. You're adding a structural element (the sister joist) that must be attached correctly to the existing joist and fastened to the rim band and beams. The sistering must be done with bolts (typically 1/2-inch diameter, spaced 16 to 24 inches apart), not nails. Some building departments will allow a contractor to size the bolt pattern from the code's sister-joist tables without an engineer; others require an engineer's calculations. The safest approach is to have the structural engineer provide a simple one-page design showing the bolt pattern and spacing. The permit fee is typically $100 to $300. Plan review is usually quick (3 to 5 days) because the work is straightforward. You'll need a framing inspection during the bolting and a final inspection after the work is complete.
Exposing a beam by removing drywall from the ceiling, beam is not being altered or moved
This is cosmetic work. You're not changing the beam or the loads on it, just revealing it. No permit required. However, if removing the drywall exposes issues — like the beam is undersized, cracked, or deflecting — and you decide to repair or reinforce it, then you've triggered permit work. Also, if the drywall removal exposes wiring or plumbing that you want to reroute, that's a separate electrical or plumbing permit. The beam exposure itself is fine. After you expose the beam, paint it, wrap it with shiplap, or add trim around it — all cosmetic, all permit-free.
Repairing a cracked header over a window with epoxy injection and a steel cable reinforcement
The answer depends on the location and the repair method. A cracked header in a basement wall might be classified as a repair and exempt. A cracked header over a window in an exterior wall is load-bearing and a safety issue; most building departments require a permit to inspect and approve the repair. If the repair involves only epoxy injection and no structural reinforcement (no bolts, no plates), some departments will allow it without a permit as a cosmetic repair. If you're adding reinforcement (like a steel cable, bolts, or a sister beam), that's structural work and requires a permit. The safest approach is to call the building department, describe the location and the crack (size, direction, active or stable), and ask whether a repair permit is needed. If the crack is active (growing), you definitely need a permit because the structural capacity is compromised. Plan on $100 to $300 for a repair permit and a framing inspection.
What to file and who can file
| Document | What it is | Where to get it |
|---|---|---|
| Permit application form | The local building department's standard structural work application, including project scope, estimated cost, and contractor/applicant information. Some departments have separate forms for structural work versus remodeling. | The building department's website (search '[city] structural permit application') or in person at the permit counter. If the department uses an online portal, the form is usually available there. |
| Structural engineer's plans and calculations | If the work requires an engineer, the engineer produces a signed and sealed set of drawings showing the beam layout, section details, connections, post sizes, footing requirements, and a page of calculations certifying the design meets the code. This is required for any wall removal, new posts, or engineered designs. | From the structural engineer you hire. The engineer's stamp must be original (wet signature and seal) or a certified digital seal, depending on your state's rules. Check your state's licensing board for current rules on digital seals. |
| Site plan showing property lines and building footprint | A simple drawing of your lot with the building shown and north arrow. This is usually only required for work affecting the exterior or lot lines, but some departments ask for it for all structural work to establish context. | Your survey (if you have one), a county assessor map, or a sketch you draw yourself. Most building departments accept hand-drawn site plans for interior work. |
| Existing condition photos | Before-and-after photos showing the beam location, any damage, deflection, or cracking, and the surrounding area. These help the inspector understand the scope and confirm the work after completion. | You take them. Photos should be clear and dated (your phone's timestamp is fine). |
| Contractor's license and insurance | A copy of the licensed contractor's active license and general liability insurance certificate. Required in most jurisdictions if a contractor is doing the work. If you're doing the work yourself (allowed only in some jurisdictions for single-family homes), you may not need this. | From the contractor or your state's licensing board. Insurance should be current and include general liability and workers' compensation. |
| Scope of work or project description | A written summary of what you're doing: 'Removing load-bearing wall between kitchen and dining room. Installing 6x10 steel I-beam supported by two 6x6 posts on new concrete pads. New posts tied to existing foundation with anchors.' This helps the department triage the permit and identify if special review is needed. | You write it or have the contractor write it. Keep it brief and specific. |
Who can pull: In most jurisdictions, a licensed structural engineer or registered architect must design the work, and a licensed general contractor or structural specialist must install it. Some states allow homeowners to pull structural permits for single-family homes, but almost never for work involving wall removal or engineered design. A few jurisdictions allow a homeowner to file the permit if a licensed engineer signs and seals the design. The best first move is to call your building department and ask: 'I'm planning a beam installation. Does the homeowner have to file, or does the contractor file?' The department will tell you the rule. In most cases, the contractor or the engineer files the permit on your behalf.
Why beam permits get rejected and how to fix them
- Incomplete application — missing engineer's stamp or calculations
If the work requires engineering (wall removal, new posts, or the scope is complex), the engineer's signed and sealed drawings must be submitted with the application. Unsigned drafts don't count. If you forget the stamp, the department will mark the application incomplete and return it. You'll have to resubmit. This adds 1 to 2 weeks. Before you file, confirm with the engineer that the drawings are ready for submission and the seal is original or certified digital. - Scope drawings lack required detail — no section cuts, no connection details, no footing depth
The drawings must show not just the beam itself but how it connects to the posts, how the posts connect to the footings, and how deep the footings are. A single elevation drawing is not enough. The engineer should provide at least one section cut showing the beam profile, the posts, the footings, and any bracing. Include a detail showing bolts, plates, and fasteners at critical connections. The building department reviews these details to confirm the installation meets the code. - Code citations are wrong or reference the wrong code edition
Check your jurisdiction's current building code edition. If the area adopted the 2021 IBC/IRC, the engineer should cite sections from that edition. If the jurisdiction is still using the 2018 IBC, cite that. Mismatched editions confuse the reviewer and flag the application as incomplete. Your building department can tell you which edition is in effect — usually posted on the website. The engineer should know this, but confirm before signing the drawings. - Application filed under the wrong permit type — filed as a remodeling permit instead of structural
Many jurisdictions have separate permit types: 'Remodeling,' 'Structural,' and 'Alteration.' Beam work is typically filed as Structural. If you file it as Remodeling, the department may reject it or send it to the wrong review queue, delaying approval. Check the permit type options on the application or call the permit counter and ask which type applies. If it's borderline, ask for guidance. - Contractor or engineer is not licensed or current in the jurisdiction
Verify that your contractor's license is active in your state and the engineer's PE license is current. Some states allow out-of-state engineers to file under reciprocal agreements, but this varies. If the engineer is in another state, confirm they can legally seal drawings in your state. Check the licensing board's website — most states now have online license-verification tools. An expired or inactive license will cause the department to reject the application. - Footing calculations are missing or don't account for soil bearing capacity
If the work involves new posts on footings, the engineer must calculate the post load and confirm the footing size is adequate for the soil-bearing capacity. In most cases, the engineer assumes a default soil bearing capacity (e.g., 2,000 psf for typical soil) unless a geotechnical report is provided. If the department questions the footing, they'll ask for a soil report. Provide one, or have the engineer revise the footing design to a conservative size (larger and deeper) to account for unknown soil. This is common in areas with known expansive soil, clay, or settling. - Temporary support plan is missing — no plan for holding up the structure while the wall is removed
When you remove a load-bearing wall, the joists and loads above must be temporarily supported before the wall is demo'd. The engineer should provide a temporary support plan showing temporary walls, posts, and bracing that will hold the load during the transition. Some departments require a separate temporary-support inspection before demo starts. If the engineer's drawings don't include this, ask for it. It's a safety requirement, not optional. - Beam sizing does not account for all loads above — roof, upper floor, mechanical, etc.
The engineer must identify and sum all loads above the beam: roof, upper floor, live load, snow load (if applicable), plus the weight of the beam itself and any mechanical equipment (HVAC, ducts) that will rest on it. Missing a load will undersizes the beam and trigger a rejection during plan review. Review the engineer's calculations with them before submission and confirm all loads are included.
Permit fees and typical costs
Beam permit fees vary by jurisdiction and project scope. A simple repair or sistering project might cost $50 to $150 in permit fees. A larger project involving engineered design, new posts, and a wall removal can run $200 to $500. Most jurisdictions base the permit fee on the estimated construction cost using a formula: 1.5% to 2% of valuation, with a minimum floor (usually $50 to $75). To estimate your fee, multiply your estimated construction cost by 1.5% and compare it to any stated minimum. For example, if you estimate the beam installation at $8,000, the permit fee might be $150 (1.5% of $8,000 is $120, but the minimum is $150). The engineer's design fee is separate and is paid directly to the engineer, not to the building department. Expect $800 to $3,000 for an engineer's calculations on a typical beam removal. The contractor's labor and materials are also separate. Plan-review fees are sometimes bundled into the permit fee; some jurisdictions charge extra for expedited review (e.g., $75 more for 1-week turnaround instead of 3 weeks). Inspection fees are usually included in the permit fee, but confirm. Some jurisdictions charge per inspection, which can add $50 to $100. If the department asks for a second plan-review cycle due to revisions, that's sometimes free if minor or charged as an addendum (typically $25 to $50).
| Line item | Amount | Notes |
|---|---|---|
| Permit application fee | $50–$500 | Usually 1.5–2% of construction cost, with a minimum of $50–$150. Call the building department to confirm the fee structure. |
| Structural engineer's design | $800–$3,000 | Paid directly to the engineer. Depends on complexity, number of posts, and whether a geotechnical report is needed. |
| Plan-review fee (expedited) | $0–$100 | Extra charge for 1-week turnaround instead of standard 3–4 weeks. Some jurisdictions include this in the base fee. |
| Inspection fee | $0–$150 | Usually included in the permit fee. Some jurisdictions charge per inspection (temporary-support, framing, final). Confirm with the building department. |
| Contractor labor and materials | $2,000–$15,000+ | Depends on beam material (wood, steel, LVL), span, posts, and site conditions. This is not a permit cost but is factored into the permit's valuation. |
Common questions
Do I need a structural engineer if I'm just replacing one joist in my basement?
It depends on the reason for replacement and your jurisdiction's rules. If the joist is damaged by rot or insect and you're replacing it with a new joist of the same size and grade in the same location, many jurisdictions classify it as a repair exempt from permitting. However, if the damage is extensive or you're upgrading the joist size, you'll likely need a permit and possibly an engineer's opinion on why the original joist failed (to ensure the new one won't fail the same way). Call your building department and describe the situation: the joist location, the damage, and the replacement plan. They'll tell you if a permit and engineer are needed.
Can I install a beam myself, or does it have to be done by a licensed contractor?
Structural work must be done by someone qualified — either a licensed contractor or a competent homeowner if the jurisdiction allows it. Most jurisdictions require a licensed general contractor or a structural specialist for beam work because it's complex and affects the safety of the building. However, some states allow homeowners to perform permitted work on their own single-family home. Check your state's contractor licensing law and your local building department's rules. Even if you're allowed to do the work yourself, the design must still be signed and sealed by a licensed structural engineer or architect. You can't design it yourself.
How long does it take to get a beam permit approved?
Plan review for a structural beam permit typically takes 2 to 4 weeks, depending on the jurisdiction's backlog and the complexity of the design. High-volume areas (Phoenix, Austin, Atlanta) might take 4 to 5 weeks. Small jurisdictions might turn it around in 3 to 5 days. Seismic-zone jurisdictions (California, Washington, parts of Nevada) often add 1 to 2 weeks for peer review. Once you get the permit, you can start work immediately. If the department asks for revisions (missing details, code questions), that adds another 1 to 2 weeks depending on how long it takes the engineer to respond and resubmit. The total time from engineer hire to permit approval is usually 4 to 8 weeks.
What happens if I install a beam without a permit?
If the building department discovers unpermitted structural work, they can order you to remove it and redo it under permit. You'll be fined (typically $500 to $2,000, depending on jurisdiction), and you'll have to pay for the engineer's redesign and the contractor's reinstallation under inspection. If you later sell the house, the title insurance company or a home inspector will flag the unpermitted structural work, and you'll have to either remove it, get retroactive permits, or take a discount on the home's sale price. Banks and appraisers also scrutinize unpermitted structural work. The safe move is always to get a permit before starting.
Does a structural engineer need to visit my home to design a beam, or can they do it remotely?
Many engineers work remotely, using photos, dimensions, and load information you provide. However, for complex situations (like assessing soil conditions, measuring deflection, or understanding how loads are distributed through the existing structure), an in-person visit is helpful and often worth the extra cost. A visit typically costs $200 to $500 for a 1- to 2-hour site visit. The engineer measures spans, checks existing conditions, photographs, and then returns to the office to produce the design. For simple projects (sistering a joist, sizing a single beam), a phone call and photos might be enough. Ask the engineer what approach they recommend.
Can I start the work while my permit is still in plan review?
No. You cannot start any structural work until the permit is approved and issued. Starting before approval is considered unpermitted work and can trigger a stop-work order, fines, and the requirement to undo the work. The only exception is temporary support — you might be allowed to install temporary walls or bracing before the final design is approved, but this usually requires a separate temporary-support permit or an emergency permit. Ask the building department for guidance if time is critical.
Do I need a permit to repair a cracked beam with epoxy injection?
Probably yes, but it depends on the location and the repair method. If the beam is in a basement and the crack is a hairline shrinkage crack (common in concrete beams), some jurisdictions allow epoxy injection without a permit as a cosmetic repair. If the beam is over a living space, or if the crack is structural (running across the beam or growing), most departments require a permit to verify the repair is adequate. If the repair involves adding reinforcement (bolts, sister beams, plates), that's definitely permit work. Call the building department with photos and the location of the crack. They'll tell you if a permit is needed.
What's the difference between a beam permit and a structural permit?
They're essentially the same thing, though terminology varies by jurisdiction. 'Structural permit' is the broader category covering any work that affects the structural frame: walls, beams, posts, foundations. 'Beam permit' is sometimes used as a shorthand for structural work involving a single beam replacement. Some jurisdictions have separate permit types for 'Structural Alterations' (like wall removal) versus 'Structural Repair' (replacing a damaged element). When you apply, ask the permit counter which type applies to your scope.
Do I need a permit to add a post under a sagging floor if the beam above is not being changed?
Yes. Adding a new post is a structural alteration and requires a permit, even if you're not changing the beam. The post must be properly sized to carry the load from the beam, connected securely at the top and bottom, and installed on an adequate footing (usually requiring excavation to frost depth and concrete). The building department must inspect the footing before concrete is poured and then inspect the post installation. If the floor is sagging, the underlying structure may also be failing, which the inspector will investigate. File a permit before you start any excavation.
How do I know if a wall is load-bearing?
A wall is load-bearing if it runs perpendicular to floor or roof joists above and carries weight down to the foundation. The easiest way to determine this is to look at the attic or basement directly above or below the wall. If joists sit on top of the wall or are tied to it, it's load-bearing. If joists run parallel to the wall, it's likely not load-bearing (unless it's a corner wall or a perimeter wall). Exterior walls are almost always load-bearing. Interior walls may or may not be. When in doubt, assume it's load-bearing and consult a structural engineer or call the building department. Do not assume a wall is non-load-bearing based on appearance or the fact that you want to remove it. The building department will ask you to prove the wall is not load-bearing if you claim it is not.
Ready to file your beam permit?
Start by calling your local building department and describing your project: Is it a repair, a wall removal, a new post, or an engineered installation? Ask these three questions: (1) Do I need a permit? (2) Does the work require a structural engineer's design? (3) What documents do I need to submit? Write down the answers. If a permit is needed, hire a structural engineer if required. The engineer will produce the designs and calculations. Then file the permit application with the department — either in person at the permit counter, by mail, or through the online portal if one exists. Plan for 2 to 4 weeks for plan review. Once approved, coordinate with your contractor to schedule the required inspections. The first is usually a temporary-support inspection (if you're removing a wall), followed by a framing or installation inspection, and finally a final inspection after completion. This process ensures the work is safe and meets the code.
Related permit guides
Other guides in the Basement, demo & structure category: