Do I need
a permit
for that?
Most people find out the expensive way — at inspection, at resale, or when a neighbour calls it in.
Where is the work?
- Inside the houseWalls, kitchens and bathrooms, and the systems behind them
- On the houseThe roof, the windows, and anything bolted to the structure
- Out on the lotFences, sheds, driveways and anything standing on its own
What are you doing?
- Replace a roofRe-roofing normally requires a permit, and the number of existing layers is what usually decides whether you can go over the top.
- Replace windows or exterior doorsLike-for-like replacement in the same opening is sometimes exempt. Changing the opening size is structural and is not.
- Build a deckA permit is usually required once a deck is more than 200 square feet, more than 30 inches above grade, serves an exit door, or is attached to the house.
- Replace sidingPractice varies more here than almost anywhere: some jurisdictions treat re-siding as maintenance and ask for nothing, others permit it so the water-resistive barrier underneath gets inspected while it is visible.
- Add a skylightCutting an opening in a roof is structural work on the framing plus a new penetration in the weather layer, which is why this is typically permitted even though the unit itself arrives ready to install.
- Put solar panels on the roofSolar is permitted essentially everywhere, and there are two approvals rather than one — the building department's, and the utility's interconnection agreement, which is what actually lets the system export.
- Enclose a porch or add a sunroomEnclosing an existing porch is an addition in the code's eyes, and how heavily it is regulated turns on one question: whether the new space is heated and cooled like the rest of the house.
- Put up a ham radio antenna or towerThe radio itself is outside the building code, but the tower or mast holding the antenna is a structure — and the binding limit is almost always zoning height, not the building permit.
- Repair storm or water damageMaking it safe can usually start immediately — permits for emergency work are commonly filed after the fact. What follows is a permit question, and if the damage is bad enough it can trigger a rule that governs the whole building rather than the damaged part.
Why nobody can just tell you
Permitting in the United States is run by thousands of separate authorities, and each one can amend the code it adopts. Any site giving you a confident yes or no for every address in the country is guessing, and you cannot tell which answers are the guesses.
22,662counties and incorporated places that could issue your permit
41%of Americans live where the state code does not settle it
30%of ZIP codes straddle a county line, so even the office is ambiguous
So this does not pretend. Each answer is the typical rule, where it comes from, and the thresholds that would flip it — plus a route to the office that actually decides. How this works.