What Home Projects Require a Permit? (2026)

Structural, electrical, plumbing, HVAC, decks, roofs, and many exterior structures usually need a permit; painting, flooring, and cabinets usually don’t. Use the permit checker before you start.

By The WikEst Editorial Team · independent editorial research project

A quick rule: if the work changes structure, systems, or the building envelope, assume you need a permit. Cosmetic swaps usually don't. Because rules are local, the permit checker and your county portal are the only way to be sure for your address.

1. Almost always needs a permit

New structures and additions; removing or modifying load-bearing walls; all electrical and plumbing; HVAC and mechanical (including furnace and water-heater swaps in many cities); re-roofing; decks and balconies above a certain height; fences over the local height limit; and ADUs. These protect life safety, so departments enforce them tightly.

2. Usually exempt (cosmetic)

Interior paint, flooring and cabinet installation, non-structural trim and molding, and like-for-like fixture swaps normally don't require a permit. Landscaping without structures is typically exempt too. The line is where "cosmetic" becomes "structural or system" — when in doubt, ask.

3. The gray zones

Water heaters, furnaces, sheds, fences, and finish work fall in a middle band that varies by jurisdiction. One city requires a permit for a water-heater swap; the next treats it as a routine replacement. This is exactly why a jurisdiction-specific check beats a general rule.

4. What skipping gets you

No permit can mean daily fines, a stop-work order, a recorded lien, and problems at resale or insurance-claim time. Unpermitted work isn't automatically condemned — it can usually be legalized with an after-the-fact permit — but fixing it later costs more than permitting up front. See how to get a permit and owner-builder for the path and the risks.