What does whole-home air sealing really cost?
Published national pricing puts a professional whole-home air-sealing project at $1,000 to $4,000. But in strong program states, you may pay a fraction of that, or nothing. Here's the range, what drives it, and how to check your state before paying retail.
What air sealing costs, by scope
National ranges from published contractor pricing. Size, leak density, and how much duct sealing gets bundled in are what separate the tiers.
| Project scope | Typical range | Notes |
|---|---|---|
| Targeted attic-plane sealing | $1,000–$1,500 | Standard-home average — the low end of the whole-home range |
| Whole-home professional project | $1,000–$4,000 | Depends on size, leak density, and duct-sealing scope |
| Comprehensive: attic + basement + crawlspace | $2,000–$5,000+ | Full-envelope scope, largest homes and leakiest houses |
There's no separately published national figure for attic-only air sealing — it's usually quoted as part of the whole-home job. Treat the targeted low end above as the closest stand-in, and ask your contractor to itemize the attic-plane line if you want a direct comparison.
What you're actually paying for
Labor is the main line item, not materials.
Labor, $60–$150/hour
The main driver of where your quote lands. Foam, caulk, and gasketing materials are cheap; finding and reaching the leaks is what takes the hours.
Scope tier
Targeted attic-plane sealing costs less than a whole-home job, which costs less than a comprehensive attic-plus-basement-plus-crawlspace scope. Know which one you're being quoted.
Home size and leak density
A larger, older, leakier house takes longer to seal properly than a smaller, tighter one — square footage alone doesn't tell the whole story.
Duct sealing, if bundled
Some whole-home quotes fold in duct sealing as part of the scope. Ask whether it's included or priced separately so you're comparing like for like.
Programs cover a lot of this
Air sealing is frequently bundled into insulation quotes and heavily subsidized by state efficiency programs. In program states, homeowners often pay far below the market rates above, sometimes close to nothing. This is the detail most cost pages skip, and it's usually the single biggest thing that changes what you actually pay.
Where a state has launched the federal HEAR program, income-eligible households can additionally get up to $1,600 toward insulation, air sealing, and ventilation combined. Launch status varies by state, several programs are income-restricted, and some launched states are still finalizing amended rules following the DOE's May 2026 guidance update — so check your own state rather than assuming the cap applies to you.
The Rebate Matcher checks your state and utility programs in about two minutes, before you get a single quote at market rate.
Find the leaks worth paying for, first
Before you hire someone to seal, hire someone to measure. A professional energy assessment (also called an energy audit) with blower-door testing runs $200–$700, about $437 on average, and finds exactly where the air is moving instead of guessing. Many state and utility programs offer the assessment free or heavily discounted — Mass Save, for example, runs no-cost assessments in Massachusetts.
The report also gives you a priority list, so you're not paying to seal gaps that barely matter while the real leaks stay open. Read the full energy audit checklist before you book one.
Which leaks are yours to fix
Weatherstripping, outlet gaskets, and caulking visible gaps are genuinely homeowner-friendly: cheap materials, low skill, an afternoon of work. The attic floor plane and anything that needs a blower door to verify belong to a professional, both because of the equipment and because that's usually where the biggest leaks live. If you want rebates, the professional half is usually also the one the program pays for.
For the full breakdown of exactly what to DIY and what to hire out, see our air sealing: DIY vs contractor guide.
Seal before you insulate, both before the heat pump
Air sealing comes early in the retrofit sequence, before insulation and well before equipment replacement. Sealing first means the insulation you add afterward performs at its rated value instead of losing performance to leaks it was never meant to cover. Getting the order right also tends to right-size whatever heating system comes next, since a tighter, better-insulated house needs less capacity.
See the full order of operations in our retrofit sequencing guide.
Where you live shifts the price
Air sealing runs mid-to-upper range in the Northeast, mid-range in the Midwest, and generally lower in the South, tracking regional labor rates more than anything else. Before you get quotes, it's worth reading how to read a quote so you know which line items to expect and which ones signal a shortcut.
Air sealing cost questions
How much does it cost to air seal a house?
Published national pricing puts a typical whole-home professional air-sealing project at $1,000–$4,000, depending on size, leak density, and how much duct sealing is bundled in. A standard-home job runs closer to $1,000–$1,500, and a comprehensive attic-plus-basement-plus-crawlspace scope can run $2,000–$5,000 or more. Labor at $60–$150 per hour is the main driver of where you land in that range.
How much does it cost to air seal an attic?
There is no clean standalone national figure for attic-only air sealing — most contractors quote it as part of a whole-home job or bundled into an insulation project. The attic plane is where the biggest leaks usually live, so a targeted attic-focused job tends to sit at the low end of the whole-home range, roughly $1,000–$1,500. Ask your contractor to itemize the attic-plane line separately if you want to compare it against a full-scope quote.
Is air sealing worth it?
Yes. It is inexpensive relative to what it saves, because air leaks can carry far more heat out of a house than conduction through the insulation alone, and it makes every dollar you spend on insulation afterward perform at its rated value. It's also frequently the cheapest line item in a retrofit project, and often the most heavily subsidized.
Is air sealing included in insulation quotes?
Often, yes. Air sealing is frequently bundled into insulation quotes rather than sold as a separate line item, because sealing the leaks before adding insulation is standard practice. If a quote for insulation doesn't mention air sealing at all, ask why — it may mean the work is being skipped, not that it's included for free.
Can I air seal my house myself?
Some of it, yes: weatherstripping, outlet gaskets, and caulking visible gaps are homeowner-friendly weekend projects. The leaks that matter most, like the attic floor plane and anything a blower door test needs to verify, are better left to a professional with the right equipment. See our full DIY-vs-contractor breakdown for the complete split.
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