Insulation costs

Insulation is priced by the square foot, but quotes hide two different square-foot numbers: material only, and material plus labor. Fixr puts material-only fiberglass at $0.30-$1.50 per sq ft and material-only cellulose at $0.60-$2.30, while labor typically runs $30-$80 per hour and accounts for 30-50% of the total project. When a contractor quotes you "$1.20 a foot," ask which number that is.

Here are the ranges we could source. Whole home: $2,000-$7,400, about $4,700 for 2,000 sq ft. Blown-in, installed: $1.65-$3.80 per sq ft, with attic jobs at $1,750-$5,500 and wall dense-pack at $2,000-$4,000. Crawl space: $500-$6,000, averaging about $2,000, or roughly $1-$5 per sq ft installed. Spray foam: whole-project $10,000-$30,000 with a $20,000 national average, and material at $0.44-$0.65 per board foot open cell versus $1.00-$1.50 closed cell. Removal: around $1.50-$3.00 per sq ft for spray foam, $300-$1,000 for a crawl space.

Depth is where quotes quietly differ. Two bids for "attic insulation" can be 6 inches apart in installed depth and still look similar on paper. Make every bid state the target R-value and the settled depth in inches, then compare. A cheaper bid to R-30 is not cheaper than a bid to R-49 - it is a different job.

Be careful with the savings math contractors use to justify a large number. ENERGY STAR's figure for sealing plus insulating is up to 10% of annual energy bills. If a $20,000 foam quote is being sold on a payback claim, ask them to show the arithmetic against your actual utility bills. Most whole-house foam jobs do not pay for themselves quickly on energy savings alone; they get bought for comfort and moisture control, which are legitimate reasons - just not the same reason.