Attic Insulation Cost Estimator
Pick your attic size and job type — get an OC price band.
Orange County, CA · Updated 2026 · Ranges from our cost guides — your quote will vary by contractor and scope
How this calculator works: it combines the cost bands published in our Orange County cost guides with a few choices about your project. The output is a range — low, typical, high — with the assumptions listed. It is a planning tool, not a contractor bid.
Your project
Bands re-read from attic-insulation-cost-orange-county.html at build time 2026-10-15.
What drives the cost
- Attic size — insulation prices scale almost linearly with square footage: a blown-in top-up to R-38 runs $1,800–$3,200 on a typical 1,000 sq ft attic ($1.80–$3.20/sq ft).
- Top-up vs. removal + reinstall — topping up existing insulation is the cheap path; full removal plus reinstall runs $3.50–$6.00/sq ft ($3,500–$6,000+ per 1,000 sq ft) because of the labor.
- Air sealing — $500–$1,200 flat, and usually the best-value part of the job: sealing gaps before insulating multiplies the payoff.
- What's in the quote — target R-value, removal vs. top-up, air sealing line item, and whether baffle/venting work is included.
Estimate, not a quote
These numbers are estimates only — not a quote, not a bid. Bands are computed from the cost ranges published in our Orange County cost guides (2026), which are themselves compiled from contractor-published pricing and industry data. Your actual price depends on scope, materials, access, timing, and the contractor. Always get 2–3 written quotes and compare the scope line by line, not just the total. We don't sell services and we have no contractor relationships.