Attic Insulation Cost

800 sq ft: $1,250–$2,100. 1,000 sq ft: $1,550–$2,600. 1,500 sq ft: $2,300–$3,900. 2,000 sq ft: $3,100–$5,200. 2,500 sq ft: $3,900–$6,500.

DIY material for the same jobs is roughly 40–50% of those figures, with the blower usually free against a bag minimum.

Air sealing of top plates and penetrations, baffles at every soffit bay, dams around flues and non-IC cans, an insulated hatch cover, depth markers, and cleanup. A bid that is only 'blow R-49' and nothing else is not a complete job.

Removing contaminated insulation: $1.00–$2.25 per sq ft. Attic hatch or ladder cover: $80–$250. Baffles: $2–$5 each installed. Bath fan re-ducting to the exterior: $200–$500 each. Knob-and-tube remediation: significant, and required before insulating in most jurisdictions.

Going from R-11 to R-49 in a cold climate typically cuts total heating and cooling costs by 10–20%. On a $2,200 annual energy bill that is $220–$440 a year — a 6–12 year payback installed, and 3–6 years DIY, before rebates.