Insulation permits

The reliable way to find out takes one phone call. Contact your local building department, describe the scope in plain terms - "blowing cellulose to R-49 over an existing attic floor," or "closed-cell spray foam applied to the underside of the roof deck" - and ask whether a permit and inspection are required. Get the answer with a name and a date, and write it down.

The scope details that most often change the answer are: whether the work creates an unvented (conditioned) attic, whether combustion appliances are inside the newly sealed envelope, whether wall cavities are being opened, and whether the insulation is part of a larger renovation that already needs permits. Unvented roof assemblies in particular are code-sensitive and are not a decision to make on a contractor's say-so alone.

Ask who pulls the permit. It should be the licensed contractor doing the work, in their name. If a contractor asks you to pull an owner-builder permit for work they are performing, that shifts liability to you and is a serious warning sign. It is also the pattern most associated with unlicensed operators.

Combustion safety deserves a separate mention. Tightening a house changes how naturally drafted furnaces and water heaters vent. Where a jurisdiction requires it, or where an auditor recommends it, a combustion safety test after air sealing is a real safety step, not an upsell. Ask about it if you have any atmospherically vented gas appliance.

How to choose

Call the building department yourself

One call, exact scope described, name and date recorded. Do not take a contractor's word for whether a permit is needed.

The contractor pulls the permit

If they ask you to pull it as the homeowner, refuse and ask why. This shifts liability and is common among unlicensed operators.

Flag unvented attic conversions

Sealing the roof deck instead of the ceiling plane changes the building assembly and is code-sensitive in most jurisdictions. Confirm before, not after.

Ask about combustion safety testing

If you have an atmospherically vented furnace or water heater, tightening the house can affect draft. Ask whether testing is required or recommended locally.

Keep the paperwork for resale

Permit records and final inspection sign-offs are what a buyer's agent looks for. Unpermitted work that needed a permit becomes a negotiation problem later.