How Much to Charge for Attic Insulation Per Square Foot
Blown-in attic insulation typically runs $1.50–$3.50 per square foot installed to R-49, spray foam $1.00–$1.60 per board foot for open-cell and $1.50–$2.50 for closed-cell, and removal $1.00–$2.50 per square foot with a substantial surcharge for rodent-contaminated or wet material. Air sealing is billed separately at $400–$1,500 depending on penetration count, and most contractors hold a job minimum of $800–$1,500.
The working rates
- Blown-in to R-49 — $1.50–$3.50 per square foot
- Open-cell spray foam — $1.00–$1.60 per board foot
- Closed-cell spray foam — $1.50–$2.50 per board foot
- Removal — $1.00–$2.50 per square foot
- Contaminated removal — a substantial surcharge on top
- Air sealing — $400–$1,500 by penetration count
- Job minimum — $800–$1,500
What actually moves the price
- Access — scuttle hole versus walk-up stairs
- Headroom and truss type — low-slope attics are slow, hot work
- Penetration count — can lights, chases, plumbing stacks
- Existing material — clean removal versus contaminated
- Ventilation corrections — baffles, soffit blockage, fan terminations
- Decked storage areas — either work around them or lift the deck
Price access, not just area
A thousand square feet through a 30-inch scuttle hole reached by ladder is a genuinely harder job than the same area with pull-down stairs — every bag goes in and every bag comes out by hand.
Same lesson as crawlspace headroom and hardscape gate width really: in any confined-space trade, area alone is a pretty poor proxy for labor.
Sell the air sealing honestly
Insulation without air sealing underperforms, and once the material’s down, those penetrations are unreachable. Explaining that sequence once — seal first, insulate second — is usually all it takes, since the logic pretty much sells itself.
Print the R-value, not just the depth
Depth is something they can verify, R-value is something they can compare. Print both — depth so the homeowner can check it with a ruler, R-value so a rebate program, an appraiser, or a future buyer can actually evaluate it.
Don’t guess at contamination over the phone
Rodent contamination and water damage are both common, and neither one shows up in a photo of an attic hatch. Inspect before you quote removal, because the gap between clean and contaminated is measured in days, PPE, and disposal costs.
Frequently asked questions
Should air sealing be included in the square-foot price?
No — price it separately by scope. Penetration counts vary enormously between houses, it's the line utility rebates most often fund specifically, and bundling it means the house with forty can lights subsidizes nothing and costs you a day.
How much does difficult access add?
A great deal. A walk-up attic with a floor deck and a 30-inch scuttle hole reached by ladder are the same square footage and completely different jobs — every bag of material and every bag of removed insulation moves through that opening by hand.
What R-value should I quote?
Whatever your climate zone recommends, commonly R-49 to R-60 in cold regions and R-38 to R-49 in moderate ones — and print the figure. Quoting depth alone lets a cheaper bid look equivalent when it isn't.
What's a fair job minimum?
$800–$1,500. Mobilization, machine setup, hose runs, protection, and cleanup are largely fixed, and a small attic priced purely by area doesn't cover a crew day.