Insulation Calculator
Calculate insulation costs by R-value for fiberglass, spray foam, cellulose, and mineral wool. Regional pricing for all 50 states. Free, no signup.
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Typical Insulation Costs by Type
| Insulation Type | Installed $/sq ft (R-30) | DIY Friendly? | Best Application |
|---|---|---|---|
| Fiberglass Batts | $1.80 – $3.10 | Yes | Walls, floors, standard cavities |
| Blown-in Cellulose | $2.45 – $4.25 | Yes (rental blower) | Attics, existing walls |
| Blown-in Fiberglass | $2.20 – $3.80 | Yes (rental blower) | Attics, irregular cavities |
| Spray Foam (open-cell) | $4.50 – $7.70 | No — pro equipment | Air sealing + insulation combo |
| Spray Foam (closed-cell) | $6.30 – $10.75 | No — pro equipment | Moisture barrier + structural, crawlspaces |
| Mineral Wool (Rockwool) | $2.60 – $4.50 | Yes | Fire-rated walls, soundproofing |
Installed costs include material and labor at R-30 equivalent. Actual costs vary by R-value, cavity depth, and accessibility.
Assumptions & Sources
Assumptions
- Material pricing: Based on 2025 national averages from major retailers and insulation contractors. Spray foam pricing from certified installer quotes.
- Labor rates: Labor multiplier of 1.3-3.0× material cost depending on insulation type. Blown-in and spray foam require specialized equipment and trained installers.
- Wall area deduction: 15% subtracted from gross wall area to account for doors, windows, and framing members.
- Energy savings: Estimated at $0.15/sq ft/year based on DOE averages. Actual savings depend on climate zone, existing insulation, and HVAC efficiency.
- Regional multiplier: ZIP-code-based adjustment using BLS regional wage data and published construction cost indices applied to both materials and labor.
Last updated: February 2026
Pro Tips from a Construction PM
- R-value by climate zone: Zone 1 (Miami) needs R-13 walls / R-30 attic. Zone 6 (Minneapolis) needs R-20 walls / R-49 attic. Look up your zone and match code minimum at bare minimum.
- Vapor barrier placement: Always on the warm side. Cold climates = interior face. Hot-humid climates (Gulf Coast) = exterior. Get this wrong and you trap moisture in the wall cavity — mold and rot within 2-3 years.
- Don't stack batts to cheat R-value: Two layers of R-19 crammed into a 2×6 cavity doesn't give R-38 — compression kills performance. Use the right product for the cavity depth.
- Attic ventilation matters equally: Sealing your attic tight without proper soffit-to-ridge ventilation creates a moisture trap. Install baffles at every rafter bay to keep air moving above the insulation.
- Air seal first, insulate second: A $200 afternoon of caulking and foam around penetrations (wires, pipes, light boxes) outperforms $2,000 of insulation laid over leaky framing. Highest-ROI energy upgrade there is.
Related Calculators
- Drywall Calculator — Estimate drywall sheets, mud, and tape if you're re-closing walls after insulation work.
- HVAC Calculator — Calculate heating and cooling system costs — proper insulation reduces your required HVAC capacity and operating costs.
- Roofing Calculator — Estimate roofing costs if your attic insulation project reveals roof deck issues that need addressing first.
Insulation Calculator by State
Get insulation cost estimates with state-specific regional pricing:
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