Spray Foam Insulation Cost - Same-Day Service, Done Right the First Time

How Much Does Spray Foam Insulation Cost in Austin?

Spray foam insulation in Austin, TX typically costs between $2.75 and $6.50 per board foot installed, which puts most whole-attic projects in the $4,500 to $12,500 range. An average 1,500-square-foot attic with open-cell foam runs $5,000 to $7,800, while closed-cell foam for the same space lands between $7,500 and $11,500. These are real numbers from the Austin market in 2026, and the single biggest variable is whether you choose open-cell or closed-cell foam.

We write every quote down before any work starts, so the number you hear on the phone is the number you pay. No adjustments at the door, no “discovered” upcharges. That’s the Kingswell Guarantee, and it’s been how we’ve priced our Spray Foam Insulation services in Austin since 2002.

Key Takeaways: Spray Foam Insulation Cost in Austin

• Open-cell foam runs $2.75 to $4.50 per board foot installed in Austin.
• Closed-cell foam runs $4.25 to $6.50 per board foot installed, and sometimes more on tight retrofit jobs.
• Most whole-attic spray foam projects in Austin fall between $4,500 and $12,500 depending on square footage and foam type.
• Attic size, roof pitch, prep work, and existing insulation removal are the main cost drivers.
• Austin’s hot, humid climate makes closed-cell foam a popular upgrade in older homes because it acts as an air barrier and vapor retarder in one step.
• Woolsey Insulation Austin gives you a written price before any work starts, every time.

Spray Foam Insulation Cost Breakdown (2026)

If you’re pricing spray foam in Austin, the numbers below are what we’re seeing across the metro in 2026. Costs vary by neighborhood, attic condition, access, and material choice, but these ranges hold up for the vast majority of single-family homes from Round Rock down to Buda.

Project Component	Typical Austin Cost Range	Notes
Open-cell spray foam (per board foot)	$2.75 – $4.50	R-3.5 to R-3.8 per inch. Common in existing attics.
Closed-cell spray foam (per board foot)	$4.25 – $6.50	R-6.5 to R-7 per inch. Air barrier plus vapor retarder.
Whole attic, open-cell (1,200 – 1,800 sq ft attic floor)	$4,500 – $7,800	Most common Austin project size.
Whole attic, closed-cell (1,200 – 1,800 sq ft attic floor)	$7,500 – $11,500	Includes roof deck application in most cases.
Spray foam on attic floor only (open-cell)	$3,200 – $5,500	Good option if roof deck isn’t the target.
Existing insulation removal and disposal	$900 – $2,200	Depends on access and material type.
Air sealing prep (caulking, foaming penetrations)	$500 – $1,600	Often bundled; ask if it’s included.
Whole-home spray foam (walls + attic, new construction)	$14,000 – $28,000	More common in new builds and major remodels.

One thing that surprises Austin homeowners: the board foot price is only half the story. A 1,500-square-foot attic with a standard 4/12 pitch roof might need 3,000 board feet of foam at 2 inches thick. That same attic in a Pflugerville ranch with a low-slope roof could need noticeably more material because of how the spray applies to the geometry. We measure and calculate everything before we quote, so you’re not paying for “rough” numbers.

We install both open-cell and closed-cell systems and work directly with eight material brands: Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. The brand we recommend for your Austin home depends on the attic’s ventilation, your HVAC setup, and whether you’re also addressing humidity. We’re not tied to one manufacturer, which means the recommendation fits the house, not the truck.

What Affects Spray Foam Insulation Pricing in Austin

• Open-cell vs. closed-cell. Open-cell is cheaper per board foot and works well in many attics. Closed-cell costs more but delivers a higher R-value per inch and doubles as a moisture barrier, which matters in Austin’s humid spring and fall seasons.
• Attic square footage and roof geometry. A 900-square-foot bungalow in Hyde Park costs less than a 2,400-square-foot two-story in Circle C. Steep roof pitches and low-slope ceilings in 1960s North Austin ranches both add labor time.
• Existing insulation removal. If your attic has old blown-in fiberglass or, in some older Austin homes, vermiculite from decades past, removal and disposal must happen before foam goes on. That’s a separate line item and a necessary one.
• Access conditions. Tight attic hatches, low clearance, or a furnace in the middle of the attic floor all make the spray crew’s job slower. Homes in Mueller and other newer developments often have tighter attic access than older Crestview or Allandale houses.
• Air sealing scope. Foam works best when canopy lights, plumbing penetrations, and top plates are sealed first. Some Austin homes need more prep than others depending on age and how many renovations have happened over the years.
• Time of year. Spring and early summer are the busiest season for insulation in Austin. Fall pricing is often the same, but scheduling flexibility can help if you’re working within a tight window. We answer the phone 24 hours a day, 7 days a week, so you can ask us directly about lead times.

Open-Cell vs. Closed-Cell Spray Foam: What Should Austin Homeowners Choose?

This is the question we answer most often. Open-cell foam is a two-part liquid that expands on contact and cures into a soft, sponge-like material with an R-value around R-3.7 per inch. It’s air-impermeable, which means it stops air movement through the attic, and it’s often the right choice for attic floor applications where the primary goal is reducing heat gain from a hot Austin roof.

Closed-cell foam cures rigid and dense at roughly R-6.5 per inch. Because it’s a vapor retarder as well as an air barrier, it’s frequently the right choice for roof deck applications in Austin, especially in homes where HVAC equipment and ductwork live in the attic. A roof deck coated with 2 to 3 inches of closed-cell foam can keep an attic 30 to 40 degrees cooler than an uninsulated attic in July, and that’s a number we see consistently when we measure before-and-after temperatures on Austin retrofit jobs.

Closed-cell also adds structural rigidity, which is why some Austin homeowners choose it for older pier-and-beam homes in neighborhoods like Travis Heights or Zilker where roof decking has loosened over time. It’s a secondary benefit, but it’s real.

Is Spray Foam Worth the Cost in Austin’s Climate?

Austin summers push attic temperatures past 140°F on a regular basis. If your HVAC ducts run through the attic, the air inside those ducts is fighting a 40 to 60 degree temperature difference every time the system kicks on. Spray foam, especially closed-cell on the roof deck, changes that equation entirely. We measure home energy use before and after on retrofit jobs, and attic spaces that were once 130°F routinely come down into the mid-80s after foam is applied.

That’s not a marginal improvement. It means your AC system works less, your upstairs rooms stay closer to the thermostat setting, and the second floor of your Austin house stops being six degrees hotter than downstairs every afternoon. For homes in Round Rock, Cedar Park, Georgetown, and across the Austin metro, that’s the difference between a house that cools down at dusk and one that actually recovers by 9 p.m.

Foam also seals the attic against dust, pollen, and cedar fever allergens that blow through Central Texas from December through February. If you have family members with seasonal allergies, an air-sealed attic with spray foam is one of the most practical upgrades you can make.

What Does Spray Foam Insulation Installation Look Like?

Here’s how a spray foam job runs with us, start to finish, and what’s covered under The Kingswell Guarantee at each step.

1. You call, a person answers. No voicemail, no call-back window. We answer live 24/7, including weekends and holidays. You describe your attic, we ask a few questions, and we schedule a time that works.
2. We measure and calculate. A uniformed, background-checked technician comes to your home, inspects the attic, and takes real measurements. This is where we check access, existing insulation, air sealing needs, and which foam type makes sense for your house.
3. You get a written price. Before any work starts, you receive a written quote with the total cost, material type, depth, and scope. That number doesn’t move. It’s in writing, and it’s backed by the Kingswell Guarantee.
4. We show up in the window. You get a committed arrival window. When we say we’ll be there, we will be. The crew arrives in uniform, and you know exactly who is walking into your home.
5. We spray, seal, and clean up. The foam is applied in lifts to the specified depth. We tarp and protect the work area. When the job is done, the site is cleaner than we found it.
6. You get a written guarantee. Every spray foam job includes a warranty in writing. If anything isn’t right within 365 days, we come back and fix it at no charge. That’s the 365-Day Done Right Promise, and it applies to every installation.

Woolsey was the first insulation. Woolsey keeps the idea in the name. We’ve been installing attic and spray foam insulation in Austin since 2002 as part of the Kingswell family of independently owned and operated insulation companies.

What Does It Cost to Insulate a Specific Austin Home Size?

800 – 1,000 sq ft attic (small home, condo, or duplex)

Open-cell foam for an attic floor in this size range typically runs $2,200 to $4,000 in Austin. These projects are common in older neighborhoods like Hyde Park, Bouldin Creek, and North Loop, where attics are small but summers are brutal. Closed-cell on the roof deck for the same footprint adds $2,000 to $3,500.

1,200 – 1,800 sq ft attic (typical 3-bedroom Austin home)

This is the most common spray foam project we quote in Austin. Open-cell runs $4,500 to $7,800, and closed-cell runs $7,500 to $11,500. Whether the foam goes on the attic floor or the roof deck matters a lot here, and that decision depends on where your ducts and HVAC equipment live.

2,000 – 3,000 sq ft attic (larger homes in Steiner Ranch, Avery Ranch, or Westlake)

Larger attics push open-cell projects into the $7,000 to $12,000 range and closed-cell into $11,000 to $18,000. Multi-level homes with complex roof lines take longer to spray and require more material per square foot of attic floor because of the additional surface area on the roof deck.

How to Save on Spray Foam Insulation in Austin

We’re straightforward about this: spray foam is a premium product, and the cheapest quote in Austin is usually the one where someone skips air sealing, sprays too thin, or uses a material that isn’t suited to the application. That said, there are legitimate ways to reduce your cost without cutting corners.

• Handle insulation removal yourself if you’re able. Removing old blown-in fiberglass yourself can save $900 to $2,200, though it’s dirty work and you need proper disposal. Most Austin homeowners prefer to have it done for them.
• Focus on the attic floor first. If your budget won’t stretch to closed-cell on the roof deck, open-cell on the attic floor is a meaningful improvement that costs thousands less. You can always add roof deck foam later.
• Check for rebates. Austin Energy occasionally offers insulation rebates, and we’ll tell you what we know when you call. We won’t promise incentives we can’t verify.
• Bundle air sealing with your foam job. Sealing top plates, penetrations, and chases before spraying is usually cheaper bundled than as a standalone project later.
• Call us for a written quote before you compare. The surest way to know what your Austin attic will actually cost is to get real measurements and a real number in writing. Call (361) 418-9997 and we’ll give you both.

Spray Foam vs. Other Insulation Types: Cost Comparison in Austin

Spray foam costs more per square foot than fiberglass batts or blown-in cellulose. There’s no way around that. But the comparison isn’t apples to apples, because foam air-seals while traditional insulation mostly slows heat transfer. In an Austin attic, that air sealing is often the difference between a comfortable second story and one that runs five degrees warmer than the rest of the house.

• Fiberglass batts: $0.80 to $1.60 per square foot installed. R-3.1 to R-3.4 per inch, but gaps and compression reduce real-world performance.
• Blown-in cellulose: $1.10 to $2.00 per square foot installed. R-3.5 per inch, good coverage, but no air sealing without separate work.
• Blown-in fiberglass: $1.00 to $1.80 per square foot installed. Similar to cellulose, no air barrier.
• Open-cell spray foam: $2.75 to $4.50 per board foot installed. Air-seals as it insulates.
• Closed-cell spray foam: $4.25 to $6.50 per board foot installed. Air-seals, vapor retards, and adds rigidity.

If you’re weighing options, we’re happy to help you compare honestly. We install spray foam and attic insulation only, so our recommendation isn’t driven by what’s most profitable. It’s driven by what your Austin house actually needs. For more on what we do, see our page on Spray Foam Insulation in Austin.

Is It Cheaper to Insulate the Attic Floor or the Roof Deck?

In most Austin homes, insulating the attic floor with open-cell foam is cheaper than sealing the roof deck with closed-cell. Attic floor foam runs $2.75 to $4.50 per board foot and requires less material because the application area is flatter and more accessible. Roof deck foam runs $4.25 to $6.50 per board foot and often requires additional prep because the roof line includes more surface area than the attic floor.

But cheaper isn’t always better. If your furnace and ductwork live in the attic, and they do in many Austin homes, roof deck foam puts your mechanical system inside the conditioned space. That means your AC isn’t trying to push 55-degree air through ducts sitting in a 130-degree attic. The energy savings on roof deck foam in duct-in-attic homes often recover the cost difference within five to seven years, and the comfort difference shows up the day the foam cures.

Does Spray Foam Insulation Require a Permit in Austin?

In most cases, spray foam insulation on an existing attic does not require a standalone permit in the City of Austin, but some situations do trigger a permit review. If the foam is part of a larger remodel, if the attic is being converted to living space, or if the project involves structural changes, the city may require a permit. We’ll tell you on the front end if your project needs one. The Kingswell Guarantee means you get a clear answer before any work starts, not a surprise inspection later.

FAQs – Spray Foam Insulation Cost

How much does spray foam insulation cost per square foot in Austin?

Spray foam in Austin runs $2.75 to $6.50 per board foot installed, with open-cell on the lower end and closed-cell on the higher end. Per square foot of attic floor, expect $3.00 to $7.00 for open-cell and $5.00 to $9.00 for closed-cell depending on depth. Call (361) 418-9997 for an exact written quote on your attic.

Is it cheaper to repair or replace spray foam insulation?

Repairing small sections of spray foam costs $300 to $900 in most Austin homes. If the foam is old, thin, or failing across more than a third of the surface area, replacement is usually the better financial decision, and full replacement runs $4,500 to $11,500 for a typical attic. We’ll inspect and give you a written recommendation either way.

How much does it cost to insulate a 1,500 sq ft attic with spray foam in Austin?

A 1,500-square-foot attic in Austin costs roughly $5,000 to $7,800 for open-cell foam and $7,500 to $11,500 for closed-cell. Those ranges include labor, material, and prep. Call (361) 418-9997 and we’ll give you a written number based on your actual attic measurements.

Can you install spray foam insulation the same day?

Most spray foam attic jobs in Austin are completed in one day, though prep work like old insulation removal can add a half-day. We’ll give you a committed arrival window and a completion time before we start. Call us 24/7 at (361) 418-9997 to check current scheduling.

How long does spray foam insulation last in Austin’s climate?

Properly installed spray foam lasts 30 years or more and typically outlives fiberglass batts and blown-in options by decades. Austin’s heat and humidity don’t break down cured foam, which is one reason it’s a strong long-term value despite the higher up-front cost. Every Woolsey job includes a written guarantee, and if anything fails within 365 days, we return and fix it at no charge.

What R-value does spray foam provide, and what does Austin need?

Open-cell foam delivers roughly R-3.7 per inch, and closed-cell delivers R-6.5 to R-7 per inch. For Austin’s climate zone, the Department of Energy recommends R-38 to R-60 in attics, which means 10 to 16 inches of open-cell or 6 to 9 inches of closed-cell depending on application. We’ll calculate the exact depth for your house when we measure.

Does Spray Foam Insulation Pay for Itself in Austin?

We tell Austin homeowners to expect a 10 to 20 percent reduction in cooling costs after a proper spray foam retrofit, with the higher end applying to homes where ducts run through the attic. On a $300 summer electric bill, that’s $30 to $60 a month during peak season. Over a full year in Austin’s long cooling season, savings of $400 to $700 are realistic for duct-in-attic homes.

At $6,000 to $9,000 for a typical whole-attic foam job, that’s an 8- to 12-year simple payback from energy savings alone. But the real payback for most Austin homeowners is comfort: upstairs rooms that actually hold temperature, no more 15-degree difference between floors, and an attic that doesn’t bake the house from above every afternoon. You can’t put a number on that, but you’ll feel it the first August after the foam cures.

What’s the Difference Between Woolsey Insulation Austin and Other Spray Foam Companies?

We’re independently owned and operated, not a national chain or franchise. We work in Austin, we know Austin houses, and we stand behind every job with a written guarantee. The Kingswell Guarantee is specific: a written price before work starts, a committed arrival window, a clean job site, a written guarantee on the work, and a free return visit if anything fails within the guarantee period. That’s 365 days, in writing, on every job.

Our technicians are background-checked and uniformed. You know who is walking into your home. The phone is answered by a live person 24 hours a day, 7 days a week. And because we work with eight leading insulation brands, the material recommendation is based on your house, not on whatever happens to be loaded on our truck that morning.

Glenn Hartley leads our Austin team, and he’s been in the insulation trade long enough to know that a written quote and a clean job site matter just as much as the foam itself. If you want to talk through your attic, call (361) 418-9997. A real person will answer, and you’ll get a straight answer.

Get a Written Spray Foam Insulation Quote in Austin

We’ll measure your attic, run the numbers, and give you a written price before any work starts. No door-step price changes, no vague estimates, no surprises. Just a real number for your specific house, backed by the Kingswell Guarantee and our 365-Day Done Right Promise.

Call (361) 418-9997 for a free estimate. We answer live, 24/7. Or start with our home page to learn more about how we work.

Pricing reflects the Austin market as of 2026. Woolsey Insulation Austin offers free estimates – call (361) 418-9997.

Written by Glenn Hartley, Owner at Woolsey Insulation Austin, serving Austin since 2002.