How Building Permits Work

Permit rules are set locally, not nationally — here's what's usually true everywhere, and how to find the rules that actually apply to you.

Why permits exist

Permits exist so a local inspector checks that structural, electrical, plumbing, and gas work meets safety code before it's covered up by drywall or siding. It's not just paperwork — skipping a required permit can cause problems later: trouble selling the home, insurance claim denials, or being forced to redo the work.

What usually needs one

Anything touching structure (additions, load-bearing walls, decks above a certain height), electrical panel work, new circuits, plumbing rerouting, HVAC replacement, water heaters, and most roofing replacements typically require a permit. Requirements vary — this is the part that differs most by city and state.

What usually doesn't

Cosmetic work like painting, flooring, cabinet swaps, and most like-for-like replacements (a new faucet in the same spot, for example) generally don't need one. “Generally” is doing a lot of work in that sentence, though — always confirm for your specific project.

How to actually find your rules

Search “[your city or county] building permit” — most jurisdictions post permit requirements and fee schedules on their building department website. A quick call to that office before starting is the most reliable way to confirm what a contractor should be pulling a permit for.

Let your contractor handle it, but check

A licensed contractor should pull required permits as part of the job — ask for the permit number and confirm it's posted or filed, don't just take their word for it. If a contractor suggests skipping a permit to save money or time, treat that as a red flag, not a convenience.