Spray foam insulation in Lawrence, KS: get up to 3 quotes from vetted local installers
Request free quotes from up to three vetted spray foam installers serving Lawrence and nearby Douglas County. Below: what your climate zone means for open vs closed cell, how much insulation to ask for, Kansas's energy code, and the rebates we could verify.
- Climate zone: 4A (2021 IECC)
- Attic target: R-60 (ENERGY STAR, uninsulated attic)
- State code: No mandatory statewide residential energy code
- Utility rebates we verified: Evergy Kansas Home Comfort Rebates
- Federal 25C credit: ended for 2026 installs
Facts last checked October 16, 2026. Sources are linked in each section.
Where we match quotes from this page
Requests from Lawrence and ZIP codes whose center is within about 20 miles of it go to our Lawrence, KS partner installers (20 ZIP codes): 66006, 66012, 66018, 66021, 66025, 66044, 66045, 66046, 66047, 66049, 66050, 66052, 66054, 66066, 66073, 66086, 66409, 66429, 66524, 66542. Outside these? Send the form anyway and we'll tell you if we can't match you.
Climate zone 4A: what it means for spray foam
Lawrence's central point is in Douglas County, which the 2021 IECC county map assigns to climate zone 4A (mixed-humid in DOE's Building America terms). Zone 4A is a moist ("A") zone, which drives the vapor and R-value rules below.
Other counties within our Lawrence service radius: Franklin County (4A), Jefferson County (4A), Johnson County (4A), Leavenworth County (4A), Miami County (4A), Osage County (4A), Shawnee County (4A), Wyandotte County (4A). All are zone 4A too.
Source: PNNL-33270, Guide to Determining Climate Zone by County (IECC 2021).
Open cell vs closed cell in Lawrence, KS
Attic roofline: both foams are used. The IRC (R806.5) does not require a vapor-retarder coating on open-cell foam under the roof deck in zone 4A (that requirement starts in zone 5), but for hybrid assemblies the foam layer at the deck must be at least R-15 to control condensation. Ask the installer how they manage winter moisture at the roof sheathing.
Closed cell is the usual choice for rim joists, basement and crawlspace walls, where its vapor resistance (about 1.5–2" makes it a Class II vapor retarder) matters most.
Metal buildings, pole barns and shops
For uninsulated metal roofs and walls, closed-cell foam sprayed directly on the panels is used both as insulation and as a vapor retarder to stop condensation from forming and dripping on the underside of the metal. When you request quotes, choose "Metal building / pole barn" and give the building's footprint and wall height; ask each installer for foam type, thickness, and whether a thermal or ignition barrier coating is required for how the building will be used. We don't have data on how common these buildings are around Lawrence, so we won't guess.
How much insulation to ask for
| Where | ENERGY STAR recommendation for zone 4A |
|---|---|
| Attic, uninsulated | R-60 |
| Attic with 3–4" of existing insulation | add R-49 |
| Floor over unconditioned crawlspace/basement | R-19 |
| Basement or crawlspace walls | R-10 continuous or R-13 cavity |
| Exterior walls (when re-siding) | add R-5 to R-10 insulative wall sheathing beneath new siding |
To reach R-60 with foam alone you'd need roughly 16.2–17.1" of open cell (about R-3.5 to R-3.7 per inch) or 8.6–12.0" of closed cell (about R-5 to R-7 per inch). Many roofline spray foam jobs are installed thinner than that and justified through the code's performance path or the unvented-attic rules, so ask every installer to write the foam type, thickness and resulting R-value on the quote and explain how it meets your local code.
Source: ENERGY STAR, Recommended Home Insulation R-Values (based on 2021 IECC). ENERGY STAR's figures are recommendations for existing homes; your local code sets the legal minimum for new work.
Kansas energy code
No mandatory statewide residential energy code. Kansas cities adopt their own codes. NAHB notes that Wichita adopted the 2024 IRC but deleted Chapter 11 (the energy chapter).
Source: NAHB, "Residential Provisions of the IECC: State Adoption Status" (current as of May 2026); official state status at DOE Building Energy Codes Program.
Homes in Lawrence, KS
Census figures for Lawrence city (ACS 2020–2024 5-year estimates): about 44,098 housing units, a median year built of 1988, 39% built before 1980 and 16% built in 2010 or later. 46% are single-family detached homes and 2% are mobile/manufactured homes. 44% of occupied homes are owner-occupied, with a median owner-reported home value of $292,700.
- 64% of homes heat with utility gas. Spray foam makes a house much tighter, which changes how gas furnaces, water heaters and fireplaces draft, so ask whether the installer (or your HVAC contractor) will do combustion safety testing after the job. Some utility rebates require it.
Rebates and incentives for Lawrence, KS
Utility programs that may apply, depending on which utility serves your address:
Evergy Kansas Home Comfort Rebates
For 2026: $0.15/sq ft for R-38 ceiling insulation (up to $500), $0.04/sq ft for air sealing (up to $300) and $50 for rim/band-joist insulation, after a comprehensive energy audit, using an Evergy-authorized contractor.
Read on the program's own page October 16, 2026. Programs change; confirm before you sign.
Kansas state Home Energy Rebates
Not yet launched Kansas Home Rebates Program
Electrification/appliance rebates (HEAR): "The application portal will be available for households to apply for home energy rebates following DOE approval and receipt of funds."
Whole-home efficiency rebates (HOMES/HER): "The application portal will be available for households to apply for home energy rebates following DOE approval and receipt of funds."
Official source: Kansas Energy Office. Status text compiled via referencesource.org, last checked by them August 25, 2026. Full Kansas rebate page →
What spray foam costs (national published ranges)
We don't have enough local quotes for Lawrence, KS to publish local prices, and we won't make them up. These national ranges are a starting point; your installers' quotes are what count.
| Example job (typical thickness) | Estimated installed range |
|---|---|
| 1,000 sq ft attic roofline, open cell (6") | $3,600–$9,600 |
| 1,000 sq ft attic roofline, closed cell (3") | $3,900–$9,300 |
| 1,500 sq ft walls, open cell (3.5") | $3,150–$8,400 |
| 1,500 sq ft walls, closed cell (2") | $3,900–$9,300 |
| 200 sq ft rim joists, closed cell (2") | $520–$1,240 |
Board feet × Angi's 2026 installed price per board foot. Angi reports a national average spray foam project of $2,888 (typical $1,455–$4,337). Check a quote you already have →
Questions to ask each installer
- Foam type, brand, thickness and resulting R-value for each area, in writing.
- Which climate zone and code edition they're designing to.
- Whether removal of old insulation, air sealing, and any required ignition/thermal barrier coating are included.
- Whether they participate in Evergy Kansas Home Comfort Rebates, and who files the paperwork.
- Whether they'll do (or coordinate) combustion safety testing if you have gas appliances.
FAQ
What climate zone is Lawrence, KS in?
Douglas County is IECC 2021 climate zone 4A, per PNNL's county list (PNNL-33270).
Should I use open-cell or closed-cell spray foam in Lawrence, KS?
Both work at the roofline in zone 4A; closed cell is the usual pick for rim joists and basement or crawlspace walls. In hybrid roof assemblies the foam layer must be at least R-15.
How much attic insulation do homes in Lawrence, KS need?
ENERGY STAR recommends R-60 for an uninsulated attic in zone 4A (or adding R-49 on top of 3–4 inches of existing insulation). Kansas's code: No mandatory statewide residential energy code.
Are there spray foam or insulation rebates in Lawrence, KS in 2026?
The federal 25C tax credit does not apply to insulation installed after December 31, 2025. Utility programs that may apply, depending on which utility serves your address: Evergy Kansas Home Comfort Rebates. Kansas's state Home Energy Rebate program status: Not yet launched.
How much does spray foam cost in Lawrence, KS?
We don't publish local prices until we have enough real local quotes. National published ranges are about $0.60–$1.60 per board foot for open cell and $1.30–$3.10 for closed cell, installed (Angi, 2026), and many companies have a $1,000–$2,000 minimum.
How does requesting quotes work?
Fill in the form once. We pass your request to up to three vetted partner installers who serve Lawrence, KS, and they contact you to schedule an estimate. It's free and there's no obligation.