Attic Insulation & Air Sealing Cost Calculator
Estimate blown-in cellulose, fiberglass, or batt insulation plus air sealing for your attic.
Project Details
How much does attic insulation cost?
A typical ~1,200 sq ft top-up with air sealing commonly plans around $2,000–$5,200 professionally. DIY materials often $800–$2,300. This calculator focuses on materials planning — get pro quotes for installed work.
Should I air seal or insulate first?
Air seal first. Adding bags over unsealed penetrations still lets warm moist air into the attic — ice dams and comfort problems continue.
Can I DIY attic insulation?
Yes for many open attics with PPE, baffles, light/chimney clearances, and walking only on joists. Complex or moisture-damaged attics should be professional.
Worked example: ~1,200 sq ft Michiana attic
Assumptions (not a quote): minimal existing insulation, blown cellulose toward ~R-49, air sealing and baffles. DIY materials often ~$800–$2,200. Pro air-seal + blow commonly ~$2,000–$5,000. See the local attic insulation market answers.
What R-value should I target?
Cold-climate guidance commonly aims near R-49 to R-60 for attics. Ask for depth markers by product type, not just bag count.
Want professional help with this project?
Whether you decide to DIY or hire a pro, we can help connect you with qualified local professionals.