Most structural, electrical, plumbing, and gas work needs a permit; cosmetic work usually doesn't. Rules vary by city—here's how to check yours.
Key takeaways
- Electrical panel work, added or moved plumbing and gas lines, structural walls, and most decks over roughly 30 inches high need a permit almost everywhere.
- Painting, flooring, and swapping a fixture on an existing line usually don't—but the dollar and square-footage thresholds that decide it vary by city.
- Skip a required permit and the real risk shows up later: a denied insurance claim if the unpermitted work caused the damage, a stalled home sale, or an order to open the walls back up.
- Call your local building department before you assume—permit rules are set city by city, not by a national code you can look up once.
- A general contractor typically pulls the permit and is on the hook for inspections; if you self-permit as an owner-builder, you take on that liability yourself.
- Ask every contractor bid whether the price includes the permit fee and who is named as the applicant—skip this and you may find out the hard way that no one pulled it.
Most renovations that touch structure, electrical, plumbing, or gas lines need a permit; most purely cosmetic work—paint, flooring, cabinet swaps on existing lines—usually doesn’t. But “usually” is doing real work in that sentence: permit rules are set by your city or county building department, not by a single national code, so the only way to know for certain is to call them and describe your specific project. This page covers the projects that typically fall on each side of that line, how to actually check with your local department, what skipping a required permit costs you later, and when the contractor pulls the permit instead of you.
Common projects: permit or no permit
| Project | Typically needs a permit? | Why |
|---|---|---|
| Electrical panel replacement or upgrade | Yes | Touches the main service and overcurrent protection for the whole house—an inspector verifies the work before it’s energized |
| Water heater replacement | Often yes | Many jurisdictions require a permit for venting, gas line, or electrical connection changes, even on a like-for-like swap |
| Deck construction or replacement over roughly 30 inches high | Yes | Structural support and guardrail height are safety-code items; some cities require a permit for any attached deck regardless of height |
| Adding or moving plumbing or gas lines | Yes | New or relocated lines need pressure testing and inspection before they’re closed up behind drywall |
| Removing or altering a structural (load-bearing) wall | Yes | Load path changes require an engineer or code-compliant header, verified by inspection |
| Room addition or garage conversion | Yes | Changes the building envelope, egress, and often the electrical and plumbing systems |
| Re-roofing | Often yes | Many jurisdictions require a permit for full tear-off and replacement, fewer for a partial repair |
| Painting or wallpapering | Usually no | Cosmetic only, no code system affected |
| Flooring replaced with similar material | Usually no | No structural or system change if the subfloor and load aren’t altered |
| Swapping a light fixture, faucet, or outlet cover on an existing line | Usually no | The line itself isn’t moved or added to |
| Small detached structures (shed, playhouse) under a size threshold | Often no | Many cities exempt small, non-habitable accessory structures under a specific square footage—check your city’s number |
Two real examples of how differently cities draw this line: Seattle’s SDCI exempts minor repairs and alterations valued at $6,000 or less in labor and materials over a 6-month period—but that exemption doesn’t cover any work on load-bearing supports or anything that reduces egress, light, ventilation, or fire resistance, no matter how small. New York City’s Department of Buildings exempts painting, wallpapering, flooring replaced with similar material, and fixture swaps on lines that stay in the same place, but requires a permit once plumbing or electrical lines are rearranged. Neither city’s list applies outside its own limits—they’re here to show you how much the threshold moves, not to tell you your own answer.
How to actually check with your building department
- Find your local building or planning department. Search “[your city or county] building permit” or “[your city or county] building department”—most publish an online portal or a permit-lookup tool.
- Describe the project specifically. Scope of work, square footage, whether it touches structure, electrical, plumbing, gas, or the building’s exterior envelope, and whether you’re doing the work yourself or hiring a contractor.
- Ask for the permit type by name, not just yes or no—a project can trigger a building permit, an electrical permit, a plumbing permit, and a mechanical permit as separate applications with separate inspections.
- Ask what triggers a re-inspection or a final sign-off, so you know the project isn’t closed until the inspector signs off, not just when the contractor packs up.
- Get the answer in writing or note the date and the staff member’s name if it’s a phone call—if a dispute comes up later, you want a record that you asked.
What skipping a required permit actually costs you
Skipping a permit doesn’t usually cause a problem on the day you skip it. The cost shows up later, and it’s bigger than the fee you avoided.
| Consequence | How it plays out |
|---|---|
| Insurance claim denied or reduced | If unpermitted work caused or contributed to the damage you’re claiming—an unpermitted electrical job causing a fire, for example—the insurer can deny the claim under the policy’s faulty-workmanship or code-compliance exclusion |
| Resale and inspection problems | A buyer’s inspector or appraiser flags unpermitted square footage or systems work; the buyer’s lender may require it be permitted and inspected retroactively before closing, or the buyer negotiates a price cut |
| Fines from the building department | Cities can fine for work done without a required permit, separate from any cost to bring it up to code |
| Forced rework | The department can require you to expose finished work (open a wall, uncover a slab) for inspection, or redo it to current code—more expensive than if it had been inspected as it was built |
| Higher premiums or a canceled policy | Beyond a single denied claim, an insurer that discovers unpermitted work during underwriting or a claim can raise your premium or decline to renew the policy |
On the insurance point specifically: the Insurance Information Institute recommends contacting your insurer before you remodel, in part so major changes to the structure are reflected in your coverage—a step that’s easy to skip along with the permit, and one that compounds the same problem: the insurer finds out about both the work and the missing paperwork at the worst possible time, when you’re filing a claim.
Who pulls the permit: you or the contractor
| Situation | Who typically pulls the permit | What to check |
|---|---|---|
| You hire a licensed general contractor | The contractor, as part of managing the job | The FTC notes that pulling permits and scheduling inspections is normally part of what a general contractor handles—confirm it’s in writing in your contract, not assumed |
| You hire a specialty contractor only (electrician, plumber) for one trade | That contractor, for their trade’s permit | Confirm which permit they’re pulling; a bathroom remodel with a plumber and an electrician may need separate permits from each |
| You do the work yourself (owner-builder) | You | Most jurisdictions let homeowners self-permit for work on their own home, but you take on the liability and the inspection scheduling yourself |
| A contractor tells you “we don’t need a permit for this” | Verify independently | This is a common way unpermitted work happens—confirm with the building department yourself before you agree, especially on anything structural, electrical, plumbing, or gas |
Ask every bid the same two questions before you sign: does this price include the permit fee, and who is listed as the applicant on the permit. A bid that’s noticeably lower than others is worth checking for this specifically—skipping the permit is one of the easier ways to shave time and cost off a quote, and it’s the homeowner who inherits the consequences once the contractor is gone.
When to call a professional
| Situation | Why it’s not a DIY call |
|---|---|
| Any work on the electrical panel or service line | Requires a licensed electrician and inspection before it’s energized—this is one of the clearest permit triggers on the table above |
| Adding, moving, or capping a gas line | Gas work is licensed-trade-only in most jurisdictions and carries an immediate safety risk if done wrong |
| Removing or altering a load-bearing wall | Needs an engineer or architect to specify the replacement header, and a permit-tied inspection to verify it |
| You’re not sure whether your project is “cosmetic” or “structural” | The building department, not a contractor’s guess, is the authority—call before you start, not after a wall is already open |
| A contractor pressures you to skip the permit to save time or money | A licensed, reputable contractor pulls the permits your project needs—treat resistance to permitting as a red flag, not a cost-saving tip |
Related guides
Frequently asked questions
How do I find out if my renovation needs a permit?
Call or check the website of your local building or planning department and describe the project—the scope, whether it touches structure, electrical, plumbing, or gas, and the square footage. The ICC recommends this directly: permit rules are set city by city, so a general list is a starting point, not the final word for your address.
What happens if I do renovation work without a required permit?
The most common consequences are a denied or reduced insurance claim if the unpermitted work caused the damage that you’re claiming for, problems during a home sale when a buyer’s inspector or the buyer’s lender flags unpermitted square footage, fines from the building department, and in some cases an order to expose the work for inspection or tear it out and redo it to code.
Does painting or replacing flooring need a permit?
Usually not. Cosmetic work—paint, wallpaper, flooring replaced with similar material, and swapping a fixture on an existing electrical or plumbing line without moving it—is commonly exempt, as NYC’s Department of Buildings lists explicitly. Moving a wall, adding a line, or changing the structure changes that answer.
Who is responsible for pulling the permit, me or my contractor?
On a job run by a general contractor, the FTC notes that pulling permits and scheduling inspections is typically part of what a general contractor manages. If you act as your own general contractor (an owner-builder permit in many jurisdictions), that responsibility—and the liability if something goes wrong—shifts to you.
Does a small project really need a permit, or is there a minimum dollar threshold?
Some cities set a minor-work threshold—Seattle, for example, exempts repairs and alterations valued at $6,000 or less in a 6-month period, with exceptions for anything touching load-bearing structure or egress. That threshold is a Seattle rule, not a national one; your city may set a different number or none at all.