Insulation Cost Calculator
Houston TX
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Need help figuring out your attic size? The square footage of your ground floor is a close approximation of your attic floor area.
Insulation Pricing Guide — North Houston TX
Typical installed cost per square foot for residential projects in Cypress, Spring, The Woodlands, Conroe, and surrounding North Houston communities.
| Service | Best For | R-Value | Typical Cost/sq ft | 1,500 sq ft Range |
|---|---|---|---|---|
| Blown-In (Fiberglass or Cellulose) | Attic top-off or full install | R-38 to R-60 | $1.00 – $2.50 | $1,500 – $3,750 |
| Open-Cell Spray Foam | Attic encapsulation, crawlspaces | R-3.7/inch | $1.50 – $3.50 | $2,250 – $5,250 |
| Closed-Cell Spray Foam | Roof deck, moisture barriers | R-6.5/inch | $3.00 – $7.00 | $4,500 – $10,500 |
| Injection Foam (Walls) | Existing wall cavities, no demo | R-4.5/inch | $2.00 – $5.00 | $3,000 – $7,500 |
| Insulation Removal | Old/damaged attic insulation | — | $1.00 – $2.00 | $1,500 – $3,000 |
| Removal + Blown-In Reinstall | Full attic refresh | R-38 to R-49 | $2.00 – $4.50 | $3,000 – $6,750 |
| Commercial Spray Foam (Metal Buildings) | Warehouses, metal shops | R-19+ | $2.50 – $6.00 | Contact for quote |
| Prices include materials and labor. Does not include drywall repair for injection foam or HVAC modifications. Texas sales tax may apply to materials. | ||||
What Affects Your Insulation Cost in Houston?
Square Footage
The largest single factor. Larger attics cost more in materials and labor time — but cost per sq ft often drops for bigger jobs.
Current vs. Target R-Value
If you already have R-11 insulation, you're adding less material to reach R-38 than a home with zero insulation. That gap directly sets material volume.
Insulation Type
Blown-in is the lowest-cost option. Open-cell spray foam costs roughly 1.5–2× more per sq ft. Closed-cell is premium but provides the highest R-value per inch.
Attic Access & Conditions
Low-pitch rooflines, small hatches, knee walls, or stored items all add labor time. Moisture damage or pest contamination may require remediation first.
Removal Needed?
Old fiberglass batts or contaminated cellulose must be removed before spray foam. Removal typically adds $1–$2/sq ft to the total project cost.
Air Sealing
Spray foam naturally air-seals; blown-in does not. Adding air sealing (gaps around penetrations, top plates) improves performance and can add $300–$800 to a project.
Frequently Asked Questions — Insulation Costs in Houston TX
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