Spray foam insulation cost in Houston, TX (as of October 2026)
Prices as of October 2026. Sources checked October 18, 2026.
Houston homeowners pay roughly $0.60 to $1.60 per board foot for open-cell spray foam and $1.30 to $3.10 for closed-cell, installed. Those rates are Angi's 2026 national figures (updated September 9, 2026). No published Houston-only rate turned up, so each dollar total here is our own multiplication, laid out card by card.
Two local facts shape a Houston quote more than the per-foot rate does. Bayou City air stays damp, and much of the city sits in mapped floodplain. FEMA's flood bulletin treats open-cell plastic foam as unacceptable below flood level, so a raised floor in a flood zone points toward the pricier foam. Meanwhile, CenterPoint Energy Houston Electric's attic incentive is paid to contractors, its materials list names fiber and loose-fill products, and its July 2026 presentation showed both residential programs over budget.
Starting rates for a Houston estimate
| Unit | Open-cell | Closed-cell | Where the number comes from |
|---|---|---|---|
| Per board foot, installed | $0.60 to $1.60 | $1.30 to $3.10 | Angi, Sep 9, 2026 |
| Per square foot, installed | $1.50 to $3.50 | $3.00 to $5.00 | HomeGuide, Dec 1, 2025 |
| R-value for each inch | R-3.6 | R-6.8 to R-7.1 | Profoam product sheet |
| Small-job floor many crews set | $1,000 to $2,000 or more | HomeGuide, Dec 1, 2025 | |
| Whole crawl space job | $1,200 to $6,900 | Angi, Sep 9, 2026 | |
Sources: Angi, "How Much Does Spray Foam Insulation Cost? [2026 Data]" (updated Sep 9, 2026); HomeGuide, "How Much Does Spray Foam Insulation Cost? (2026)" (Dec 1, 2025); Profoam product price sheet.
Humid air and floodwater: picking open-cell or closed-cell
Houston Intercontinental averages 89% relative humidity in the early morning and 59% in mid-afternoon across a full year, per NOAA's Comparative Climatic Data through 2023. July and August mornings average 93%. Phoenix, for contrast, averages 46% and 23%. Houston's own amended energy code sets its summer design wet-bulb at 80.5°F, with 7,357 cooling degree days (base 50°F) against 1,371 heating degree days (base 65°F).
Flooding matters just as much. FEMA's Technical Bulletin 2 (January 2025) rates building materials as acceptable or unacceptable for use below the base flood elevation in a Special Flood Hazard Area:
- Acceptable insulation: sprayed polyurethane foam (SPUF) or closed-cell plastic foams.
- Unacceptable insulation: fiberglass, mineral wool, cellulose, cotton and open-cell plastic foams.
So if your pier-and-beam floor or a wall cavity sits below the flood elevation, closed-cell foam is the option that lines up with FEMA's acceptable list. Houston's Floodplain Management Office issues permits in the 100-year floodplain, the 500-year floodplain and the floodway, and requires new construction in high flood risk areas to sit at least 2 feet above the 500-year elevation (3 feet in the floodway). Repairs to homes in the floodplain cannot start until you contact that office at 832-394-8854. Look up your flood zone on FEMA's Flood Map Service Center before you ask for foam bids.
Higher in the house, the choice loosens. At Angi's rates the two foams cost about the same per unit of R-value: $0.17 to $0.44 per R per square foot for open-cell and $0.18 to $0.46 for closed-cell. Open-cell needs about twice the depth to get there, which suits a deep rafter bay better than a shallow one.
Sources: NOAA NCEI, Comparative Climatic Data, relative humidity (data through 2023); City of Houston, Amendments to the 2021 IECC (PDF); FEMA, NFIP Technical Bulletin 2, Flood Damage-Resistant Materials Requirements (January 2025); Houston Permitting Center, Floodplain Management Office; FEMA Flood Map Service Center.
Four Houston jobs, priced step by step
Each card starts from a 1,400 square foot single-story house. That size is our modeling choice, not a Houston average. Board feet equal area times inches; depth equals the target R-value divided by R per inch (the thinner closed-cell depth pairs with the low price, the thicker with the high). Totals are rounded to the nearest $100.
Card 1: vented attic floor to R-49
- Target: R-49, the climate zone 2 ceiling value in the 2021 IECC that Houston enforces.
- Open-cell depth: 49 ÷ 3.6 = 13.6 inches. Board feet: 1,400 × 13.61 = about 19,056.
- Open-cell total: 19,056 × $0.60 = $11,400; 19,056 × $1.60 = $30,500.
- Closed-cell depth: 49 ÷ 7.1 = 6.9 inches up to 49 ÷ 6.8 = 7.2 inches, or about 9,662 to 10,088 board feet.
- Closed-cell total: 9,662 × $1.30 = $12,600; 10,088 × $3.10 = $31,300.
This card runs high because foam is priced by depth. CenterPoint's ceiling incentive, covered below, lists fiber and loose-fill materials rather than foam.
Card 2: sealed attic, foam under the roof deck
- Roof area: a 6/12 pitch adds about 11.8% over the 1,400 square foot footprint, so about 1,565 square feet of deck. Gable ends are left out.
- Open-cell at 6 inches (Profoam's typical roofline depth): 1,565 × 6 = 9,390 board feet, about R-21.6.
- Open-cell total: 9,390 × $0.60 = $5,600; 9,390 × $1.60 = $15,000.
- Closed-cell at 3 inches (Profoam's typical roofline depth): 1,565 × 3 = 4,695 board feet, about R-20.4 to R-21.3.
- Closed-cell total: 4,695 × $1.30 = $6,100; 4,695 × $3.10 = $14,600.
Those depths fall well short of R-49, and we found no Houston amendment that sets a lower roofline value. Ask the installer which code path applies to this assembly on your permit before you compare it with Card 1.
Card 3: raised pier-and-beam floor in a flood zone, closed-cell only
- Target: R-15, the floor level CenterPoint's program standards name for pier-and-beam floors.
- Depth: 15 ÷ 7.1 = 2.1 inches up to 15 ÷ 6.8 = 2.2 inches, or about 2,958 to 3,088 board feet under 1,400 square feet.
- Total: 2,958 × $1.30 = $3,800; 3,088 × $3.10 = $9,600.
Open-cell is not priced here because FEMA lists open-cell plastic foams as unacceptable below the base flood elevation.
Card 4: 1,000 square feet of 2x4 exterior wall
- Open-cell filling the 3.5 inch cavity: 3,500 board feet, about R-12.6. Total: $2,100 to $5,600.
- Closed-cell at 2 inches (Profoam's typical wall depth): 2,000 board feet, about R-13.6 to R-14.2. Total: $2,600 to $6,200.
On small jobs, a crew's minimum charge of $1,000 to $2,000 or more can set the bill instead of the per-foot rate.
Sources: Angi, "How Much Does Spray Foam Insulation Cost? [2026 Data]" (updated Sep 9, 2026); Profoam product price sheet; DOE/PNNL, Energy Savings Analysis: 2024 IECC for Residential Buildings; CenterPoint Energy Houston Electric, 2026 Residential SOP Program Manual, August (PDF); FEMA, NFIP Technical Bulletin 2, Flood Damage-Resistant Materials Requirements (January 2025); HomeGuide, "How Much Does Spray Foam Insulation Cost? (2026)" (Dec 1, 2025).
CenterPoint's incentive: who collects it and what is left
CenterPoint Energy Houston Electric runs the poles and wires, while your retail provider handles the account. Its insulation money flows through two standard offer programs: the Residential SOP and the Hard-to-Reach SOP, which serves households at or under 200% of the federal poverty level or 80% of area median income. In both, CenterPoint pays a registered contractor, called a project sponsor, not the homeowner. CenterPoint's ceiling insulation page puts it plainly: "The rebate is given to the contractor who may extend savings to you on your bill." CenterPoint also says it is not a party to your agreement with that contractor, and new construction is not eligible.
Rates in the August 2026 manuals, per square foot of attic, for taking insulation that starts below R-5 up to R-49:
- Residential SOP: $1.00 with electric resistance heat, $0.56 with a heat pump, $0.50 with gas heat.
- Hard-to-Reach SOP: $1.30 with electric resistance heat, $0.84 with a heat pump, $0.78 with gas heat.
On the 1,400 square foot attic above, that comes to $700 to $1,400 under the Residential SOP and up to $1,820 under Hard-to-Reach, paid to the sponsor. The manuals treat existing insulation at R-22 or above as already in compliance.
Three conditions limit what spray foam buyers can expect:
- Materials. Appendix A of both manuals lists mineral fiber blanket, mineral fiber loose fill, cellulose, vermiculite and perlite for ceiling insulation; spray foam is not on the list. CenterPoint's mid-year deck mentions spray foam only when assessing existing insulation, at R-6.0 per inch. Whether a foam attic job earns the incentive is a question for CenterPoint, so ask before you count on it.
- Age of home. Houses built after January 2003, or previously ENERGY STAR certified, are excluded.
- Money. Both programs run "subject to the availability of program funds," first come, first served. Once funds are committed, projects may go to a waitlist or be deferred to the next program year, and CenterPoint can reallocate funding.
Funding status for 2026: CenterPoint's mid-year sponsor presentation on July 7, 2026 showed both programs over budget for the year to date. For the Residential SOP that was $339,000 in incentives against a $300,000 budget. CenterPoint's own website gives no amount or status; these figures come from the program administrator's sponsor portal, and the picture may have changed since July. Confirm with CenterPoint, or ask a participating sponsor whether your job would be funded, waitlisted or pushed to 2027.
For comparison, Oncor in North Texas posts its status openly: its insulation page says 2026 funding for its Home Energy Efficiency and Low-Income Weatherization programs "has been fully exhausted," with updates in January 2027.
Sources: CenterPoint Energy, Ceiling and Attic Insulation Incentives; CenterPoint Energy Houston Electric, 2026 Residential SOP Program Manual, August (PDF); CenterPoint Energy Houston Electric, 2026 Hard-to-Reach SOP Program Manual, August (PDF); CenterPoint Energy Houston Electric, 2026 Mid-Year RSOP/HTR Session, July 7, 2026 (PDF); Oncor, Insulation.
Retail providers, gas service and federal credits
- Retail electric providers. Your provider sends the bill, but Reliant, the one we checked, lists a smart thermostat program, referral credits and a 10% discount on its own HVAC services on its customer benefits page, with no insulation offer.
- CenterPoint gas. We found no insulation rebate for Houston gas customers.
- Federal 25C credit: over. The IRS says the Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025, so foam installed in 2026 does not qualify.
Sources: Reliant, Customer Benefits; IRS, Energy Efficient Home Improvement Credit.
What Houston's building code expects
Houston writes its own amendments. The 2021 Houston Construction Code, adopted under Ordinance 2023-907 after going to City Council on October 25, 2023, took effect January 1, 2024. Houston's IRC amendments strip the residential energy chapter down to a scope line pointing to the energy code, and the Houston IECC amendments leave the residential insulation tables as the 2021 IECC prints them. For climate zone 2A, that means an R-49 ceiling.
One Houston-specific line helps foam. Section R402.2.13 requires insulation in walls (assemblies 60 degrees or more from horizontal) to touch an air barrier on all sides, but exempts air-impermeable insulation, defined as air permeance at or below 0.02 L/s·m² at 75 Pa. Ask the bidder for the product's ASTM E2178 or E283 result showing it meets that limit.
Outside the city limits the baseline is older. Texas's statewide residential energy code, set by the State Energy Conservation Office, is Chapter 11 of the 2015 IRC, in force since September 1, 2016. Check with the city or county that issues your permit.
None of this forces a retrofit to reach R-49. It sets the number a permitted job is measured against, which is why Card 1 uses it.
Sources: Houston Permitting Center, Code Development; City of Houston, Amendments to the 2021 IRC (PDF); City of Houston, Amendments to the 2021 IECC (PDF); Texas Comptroller, SECO, Single-Family Construction.
Ask each bidder for the area, the depth in inches and the foam type, then multiply; if board feet times the rate does not land near the quote, ask why. See other Texas cities on our Texas page, local housing and code notes on the Houston spray foam page, and the state-by-state picture in our 2026 insulation rebate tracker. Run any bid through the quote checker.
Questions Houston homeowners ask about foam pricing
Should a Houston home get open-cell or closed-cell foam?
Below the flood elevation in a mapped flood zone, FEMA's Technical Bulletin 2 lists sprayed polyurethane or closed-cell plastic foams as acceptable and open-cell plastic foams as unacceptable, so closed-cell is the safe choice there; confirm with the city's Floodplain Management Office. Higher up, either works: open-cell runs $0.60 to $1.60 per board foot at R-3.6 per inch and closed-cell $1.30 to $3.10 at R-6.8 to R-7.1, so the price per unit of R-value is close.
Does CenterPoint pay for spray foam insulation?
Ask CenterPoint before counting on it. Its 2026 program manuals list mineral fiber, cellulose, vermiculite and perlite as ceiling insulation materials, and spray foam is not on that list. Any incentive is paid to the participating contractor, not to you, and CenterPoint's July 2026 sponsor presentation showed both residential programs over budget.
Do I need R-49 in my Houston attic?
R-49 is the climate zone 2 ceiling value in the 2021 IECC, which Houston enforces with its own amendments. A permitted job is measured against it. Spray foam reaches it at about 13.6 inches of open-cell or about 7 inches of closed-cell.
Can I claim a tax credit for spray foam installed in 2026?
No. The IRS says the 25C Energy Efficient Home Improvement Credit covers improvements made through December 31, 2025.