You need a permit to work on your house whenever the project touches the building’s structure, electrical wiring, plumbing, gas lines, or HVAC equipment; cosmetic and minor repair work generally does not require one. The dividing line comes from the International Residential Code (IRC), which most local building departments adopt as their baseline.1International Residential Code. IRC Section R105 – Permits Your city or county may adjust specifics, but the pattern is consistent across the country: if a project could affect the safety of the building or its occupants, file for a permit before you start.
Projects That Don’t Need a Permit
IRC Section R105.2 lists work you can do without filing paperwork or scheduling an inspection. The list is shorter than most homeowners expect, but it covers the improvements people do most often:
- Interior finish work: painting, wallpapering, tiling, carpet, hanging cabinets, and replacing countertops.
- One-story detached sheds, workshops, or playhouses with a floor area of 200 square feet or less.
- Residential fences under 7 feet tall.
- Decks that are 200 square feet or smaller, sit no more than 30 inches above grade, aren’t attached to the house, and don’t serve a required exit door.
- Retaining walls under 4 feet, measured from the bottom of the footing to the top of the wall, as long as they aren’t supporting a slope or extra load above.
- Sidewalks and driveways on your own property.
- Backyard swings and playground equipment.
- Window awnings supported by the exterior wall that don’t project more than 54 inches.
The code also exempts minor utility tasks: replacing a light switch or outlet, swapping a lamp or light fixture, plugging in portable appliances, fixing a leaky faucet, clearing a drain clog, and replacing portable heating or cooling units.1International Residential Code. IRC Section R105 – Permits
One caveat worth keeping in mind. Exempt from a permit does not mean exempt from the building code. If you tile a bathroom floor and the work damages the subfloor below, you’re still responsible for doing the job correctly. The exemption just means nobody checks your work in advance.
Projects That Do Need a Permit
Structural and Load-Bearing Changes
Removing or adding a wall, widening a doorway, cutting a new window opening, or building an addition all require a permit because they change how the house carries weight from the roof down to the foundation. The IRC’s repair exemption ends the moment you cut into any wall or partition, remove a structural beam or load-bearing support, or alter a required exit path.2International Residential Code. IRC Section R105 – Permits The building department verifies that headers, beams, and footings are sized correctly for the new load path. An undersized header over a widened kitchen opening can take years to visibly fail, and by then the fix is far more expensive than the original permit would have been.
Additions and garage conversions also sit here. Anything that changes the building’s footprint or adds habitable square footage requires plan review and inspections at several stages, from the foundation pour through final framing.
Electrical, Plumbing, Gas, and HVAC Work
The general rule is simple: if you’re running new wire, new pipe, or new duct, you need a permit. That covers adding a circuit for a kitchen appliance, extending a gas line to a new range, roughing in plumbing for a bathroom remodel, or replacing your furnace or central air conditioner. The IRC requires a permit for anyone who installs, enlarges, alters, or replaces any electrical, gas, mechanical, or plumbing system regulated by the code.3Grant County, WA. 2021 International Residential Code (IRC) Section R105 Permits
Water heater replacement surprises people. Even though you’re swapping one unit for another, a permit is required because a badly installed water heater can leak carbon monoxide, catch fire, or cause water damage if the pressure relief or venting is wrong.4Hamilton County Public Health. Water Heaters – Hamilton County Public Health Furnace and air conditioner replacements follow the same logic: a mechanical permit confirms the new equipment is sized, vented, and connected correctly.
The exempt side of utility work is narrow. You can stop a leak in an existing pipe, clear a drain, replace a faucet, swap a light fixture, or plug in a portable appliance. The moment you need to replace concealed piping, rearrange existing plumbing lines, or run new wiring to an outlet that didn’t exist before, you’re back in permit territory.1International Residential Code. IRC Section R105 – Permits
Exterior and Outdoor Projects
Decks taller than 30 inches above grade, larger than 200 square feet, or attached to the house need a permit. Inspection covers footings, post connections, the ledger board attachment to the house, joist hangers, and railing height. The ledger connection is the single point of failure behind most documented deck collapses.2International Residential Code. IRC Section R105 – Permits
Detached garages, sheds over 200 square feet, and other accessory structures need permits and must comply with zoning setbacks. Roofing projects usually need a permit too, especially when you’re tearing off old layers; the department checks whether the roof structure can carry the new material and whether flashing and underlayment meet current code.5Peachtree Corners. Residential Re-roofing Building Guides for Homeowners Some jurisdictions waive the permit for a simple shingle overlay, but this varies enough that you should check before starting.
Fences under 7 feet don’t need a building permit under the IRC, but many municipalities still require a site plan for zoning review to confirm the fence respects setback lines and doesn’t block sight lines at intersections.6Greenville, SC – Official Website. Do You Need A Permit – Section: Permit Exceptions “No building permit” is not the same as “no approval needed.”
Can You Pull Your Own Permit?
Most jurisdictions let homeowners pull permits for work on a home they own and occupy as their primary residence. This is often called a homestead exemption or owner-builder permit. You apply as both owner and contractor, and the work is inspected to the same standard a licensed professional would face. The catch: some states and municipalities require a licensed professional for specific trades, especially electrical and plumbing. You may be allowed to pull the permit yourself but still need a licensed electrician or plumber to perform the actual installation. Confirm who is allowed to do the physical work before you assume you can DIY the whole project.
What Happens If You Skip the Permit
The real cost of unpermitted work usually isn’t the fine. Fines vary by jurisdiction and commonly run from a few hundred to several thousand dollars depending on the scope of the project. The more painful consequences surface later.
Stop-Work Orders and Retroactive Permits
If an inspector discovers unpermitted work in progress, the standard response is a stop-work order posted on the property. Construction halts until you apply for a retroactive permit and get the work inspected. Many jurisdictions charge a penalty multiplier for after-the-fact permits, often double the standard fee or more. If the inspector finds code violations, you’ll need to open walls, rip out work, or make corrections before passing inspection.
Insurance Claim Denials
Homeowners insurance can deny a claim if the damage is connected to unpermitted work. The classic case is an electrical fire traced to wiring that was never inspected. The insurer’s position is that the work was never verified to code, so the risk was created by the homeowner. Insurers regularly scrutinize whether major systems like electrical, plumbing, and HVAC were properly permitted when evaluating fire and water damage claims. Skipping a permit to save a couple hundred dollars can cost tens of thousands when a claim gets denied.
Resale and Appraisal Problems
Unpermitted work can reduce your home’s appraised value or kill a sale. Appraisers may refuse to count unpermitted square footage toward the home’s value, and some mortgage lenders won’t finance a purchase if they discover unpermitted additions during underwriting. If you sell a home with unpermitted work, you’re generally required to disclose it on your state’s seller disclosure statement, and failing to disclose can create legal liability after closing. Title insurance does not cover problems tied to building code violations or unpermitted work, so a buyer who inherits your unpermitted addition has no safety net.
Personal Liability
If someone is injured on a structure you built without a permit, the lack of inspection can become the centerpiece of a liability claim against you. A guest who falls through an uninspected deck, or a tenant hurt by a faulty electrical installation, creates exposure that can go beyond what insurance will cover if the insurer denies the claim.
How to Confirm What Your Town Requires
The IRC sets the baseline; your local building department is the final authority. Most jurisdictions adopt the IRC with amendments that tighten or loosen specific requirements. A shed under 200 square feet might be exempt under the model code and still require a permit in your town.
Start at your municipal or county building department website. Most publish a checklist of what needs a permit and what doesn’t. Search for your city or county name plus “building permit requirements” and you’ll usually find a downloadable guide. If the website isn’t clear, call the department and describe your project. Building officials answer these questions all day, and a five-minute phone call is cheaper than finding out mid-project that you should have filed paperwork two weeks ago.
For permitted projects, expect to submit a site plan showing your property boundaries and the location of the work, floor plans or drawings of what you’re building, and for structural work, engineering calculations stamped by a licensed professional. Simpler projects like a water heater swap or a fence might only need a one-page application and a basic sketch. Review times vary; straightforward residential permits are often processed within a few business days to a few weeks, while complex plans take longer. Permits typically expire if work isn’t started within 6 to 12 months, so don’t pull one until you’re ready to begin.
Fees are usually calculated as a percentage of the project’s estimated construction value, commonly around 1 to 2 percent, though some jurisdictions use flat fees or square-footage rates. Trade-specific permits for smaller electrical or plumbing jobs often run between $50 and $200. The fee is a fraction of the project cost and a rounding error compared to the risk of skipping the permit altogether.