Do I Need a Permit for My Home Renovation? What Happens If My Contractor Skips It

A building permit costs $100-$400 depending on the project and your municipality. Skipping that permit can cost you $5,000-$20,000 when you try to sell your house. That's a 50x penalty, and the contractor who told you to skip it will be long gone by then.

Most homeowners don't know which projects require permits. Contractors know this. Some exploit it. "We don't need a permit for this" is one of the most common lines I hear from homeowners after a project goes wrong, and it almost always came from the contractor.

I watched a $60,000 roof-and-solar job blow up over a permit issue. The original fascia estimate was $2,000. After tear-off, the contractor piled on $6,800 for fascia "replacement" that turned out to be 40-50% paint jobs. But the bigger problem? The solar installation wasn't permitted. When the homeowner tried to refinance 8 months later, the appraiser flagged it. Lender required remediation before approving the loan.

Don't let this happen to you. Grab the free Contractor Defense Checklist for the complete permit verification process. Here's what you need to know.

Which Home Projects Require a Permit?

Permit requirements vary by municipality, but here's the general rule for most cities and counties:

The gray areas trip people up. A window replacement in the same opening might not need a permit. A window in a new opening always does. A water heater swap in the same location might not (in some cities). Moving it to a new location almost always does.

When in doubt, call your local building department. It takes 5 minutes. They'll tell you exactly what's required. Free.

Why Contractors Want to Skip the Permit

Four reasons, and none of them benefit you.

1. Inspections expose bad work. A permitted project gets inspected at critical stages. An unpermitted project doesn't. If the contractor is cutting corners on flashing, underlayment, or electrical connections, the last thing they want is a city inspector looking at it.

2. Permits cost time. The permit application takes 1-3 weeks to process in most jurisdictions. Contractors working on tight schedules don't want to wait. Your project becomes their schedule problem.

3. Permits cost money (for them). Some contractors include the permit fee in their quote. Others eat it as overhead. Either way, it's a line item they'd rather eliminate.

4. Permits create a paper trail. If the contractor does substandard work and you file a complaint with the licensing board, the permit record is evidence. No permit means no official record of who did the work or what was specified.

What Happens If Work Was Done Without a Permit?

This is where it gets expensive.

At resale: The buyer's inspector or appraiser flags unpermitted work. The buyer's lender may refuse to approve the mortgage until the work is permitted and inspected. You either retrofit the work to current code (expensive), reverse the work entirely (more expensive), or apply for a retroactive permit and pray the inspection passes.

Retroactive permits: Some jurisdictions allow you to pull a permit after the fact. But the inspection becomes more invasive because the inspector can't see behind finished walls. They may require opening walls, ceilings, or access panels to verify code compliance. Cost: $2,000-$10,000 in inspection access work alone, plus the permit fee, plus any corrections.

Insurance implications: Unpermitted work may void your homeowner's insurance coverage for that portion of the home. If an unpermitted electrical upgrade causes a fire, your insurance company has grounds to deny the claim. That's not theoretical. It happens.

What We Tested: The Permit Verification Script

Skipping the permit seems harmless in the moment. $100-$400 saved. Until it isn't.

I started telling every homeowner to use this exact script before work begins:

Say this to your contractor: "I want to confirm that all required permits will be pulled for this project. Can you include the permit numbers in your progress updates? And I'd like copies of the inspection results at each stage."

About 20% of contractors I've seen push back on this. "It's a small job, we don't need one." "The city takes forever, it'll delay your project 3 weeks." "Nobody pulls permits for this kind of work."

Every one of those responses is a screening signal. A contractor who resists permitted, inspected work is telling you something about their quality standards. Listen.

The 80% who have no problem with it? Those are the ones you want on your property.

How to Check If Previous Work Was Permitted

Buying a house? Just finished a project and not sure if the contractor pulled permits? Here's how to check:

1. Call your local building department and ask for permit history on your address
2. Many municipalities have online permit search portals. Check your city's website.
3. Compare the permit records against visible improvements. New roof in 2024 but no roofing permit? That's a gap.
4. If you find unpermitted work, get an inspection from a licensed inspector (not the contractor who did the work) to assess code compliance

Some homeowners discover unpermitted work years after purchase. If the work is sound and up to code, a retroactive permit may resolve it. If it's not up to code, you're looking at remediation costs that the previous owner should have disclosed.

The Cost of Getting It Right vs. Getting It Wrong

| Scenario | Cost | |---|---|---| | Pulling the permit upfront | $100-$400 | | Retroactive permit (work passes inspection) | $200-$800 + inspection access | | Retroactive permit (work fails inspection) | $2,000-$10,000 in corrections | | Removing unpermitted work at resale | $5,000-$20,000 | | Insurance claim denied due to unpermitted work | $10,000-$100,000+ |

The math is not close. $400 now or $20,000 later. And that's the contractor's $400, not yours (in most cases the permit fee is included in the quote).

The full permit verification process, with the script to use with your contractor and the checklist for verifying permits on previous work, is in the Contractor Defense Checklist.

Frequently Asked Questions

Can I pull the permit myself instead of the contractor? In many jurisdictions, the homeowner can pull the permit for work on their own home. But if you pull the permit, you become the responsible party for code compliance, not the contractor. Most experts recommend letting the contractor pull the permit so they bear the responsibility.

What if my contractor says no permit is needed and I'm not sure? Call your local building department directly. Describe the project. They'll tell you within minutes whether a permit is required. Never take the contractor's word as final. Contractors are not the permitting authority.

How long does a building permit take to get? Simple permits (water heater, roof replacement) are often same-day or within a week. Complex permits (additions, major remodels) can take 2-6 weeks. Express or expedited review is available in some jurisdictions for an additional fee.

Does unpermitted work always have to be disclosed when selling? In most states, sellers are required to disclose known unpermitted work. Failure to disclose can result in legal liability after the sale. Some sellers genuinely don't know about previous unpermitted improvements, which is why buyers should always check permit history.

What if the inspector finds something wrong during a permitted project? The contractor fixes it and calls for re-inspection. This is the system working as intended. A failed inspection isn't a crisis. It's quality control. It costs the contractor time but protects you from paying for work that doesn't meet code.

I share permit tips and contractor screening advice on X. Follow me at @beforeyouhire23.

If you have a project coming up, or you're wondering about work that was done without permits, the Contractor Defense Checklist has the full verification process and the confrontation scripts. Download it free here.