Do I need a permit to reroof?
Most reroofing work needs a permit, but the details are set locally and vary widely. Here is the general picture and, more importantly, how to confirm the rules for your address.
Usually, yes
In most jurisdictions a reroof requires a building permit, especially a full tear-off and replacement. Permits exist so the work is inspected for code compliance — including the two-layer limit, proper underlayment, and fastening — and so there is a record of the work for insurers and future buyers. Treating a permit as optional is a gamble that rarely pays off.
What raises the requirements
Some work triggers additional permit and inspection steps. Replacing or repairing the roof deck, doing any structural work, or changing the roofing material — for example switching from asphalt to metal or tile — typically requires more, because the weight load and fire rating of the assembly change. A like-for-like shingle replacement is usually the simplest case; a material change is the most involved.
How to confirm for your address
Because requirements, fees, and inspection steps differ by city and county, the only reliable answer is from your local building department — a quick call or a look at their website before you start. Treat any general guidance, including this page, as a starting point rather than the rule for your specific property. A licensed roofing contractor will normally handle the permit as part of the job and will know the local process.
Why it is worth doing properly
Unpermitted roof work can cause real problems later: it can complicate or void insurance claims after storm damage, and it routinely surfaces during home sales, where unpermitted work can derail or delay a closing. The permit fee is small next to those risks. It also ensures the inspection actually happens, which protects you from a contractor quietly cutting corners on the parts you cannot see.
The bottom line
Assume you need a permit, confirm the specifics locally, and make sure whoever does the work pulls it. If a contractor suggests skipping the permit to save time or money, treat that as a warning sign about how they operate. For the related decision of whether to overlay or strip the old roof, see reroofing vs tear-off.