Blown-In Insulation Cost - Same-Day Service, Done Right the First Time

How Much Does Blown-In Insulation Cost in San Antonio?

Blown-in insulation in San Antonio typically costs $1,650 to $3,800 for a standard attic installation, which works out to roughly $1.10 to $2.80 per square foot including materials and labor. Most homeowners in the area pay about $2,400 for a 1,500-square-foot attic brought up to R-38, the recommended level for our climate zone. The price swings based on material choice (fiberglass vs. cellulose), how much old insulation needs to come out first, and how accessible your attic is.

Before you read further, know this: we give you a written price before any work starts. No door-step surprises. If you’d rather skip the details and just get a number for your house, call (254) 279-0971 and we’ll walk you through it.

Blown-In Insulation Cost Breakdown (2026)

Here’s what blown-in insulation costs look like across the San Antonio metro in 2026, based on the jobs we’ve priced in Alamo Heights, Stone Oak, Helotes, Converse, and everywhere in between. These are real market ranges, not national averages.

These numbers assume a single-story home with a standard attic hatch and reasonable access. Two-story homes in places like Dominion or Fair Oaks Ranch tend to run slightly higher because the attic is farther from where the truck parks, and hoses take longer to route.

What’s Included in a Blown-In Insulation Quote

When you get a price from us, it’s a line-item breakdown, not a mystery lump sum. Here’s what we include:

• Material cost – fiberglass or cellulose, measured in bags and matched to your square footage and target R-value
• Labor – typically two technicians, and the clock starts when we arrive, not when we leave the shop
• Prep work – moving it, covering it, protecting it; we lay down poly sheeting before anything gets blown
• Attic prep – if your attic needs baffle installation, hatch sealing, or vent chutes, it’s itemized, not hidden
• Cleanup – we don’t leave fiberglass dust in your hallway
• The guarantee – a written 365-day workmanship warranty, automatically included, no upsell

What Affects Blown-In Insulation Pricing in San Antonio

Six things move the needle on price. Most of them are specific to this city’s housing stock and climate.

• Attic square footage. The obvious one. A 900-square-foot bungalow in Jefferson is a half-day job; a 3,200-square-foot McMansion in Stone Oak is a full day plus a second truck run. Simple math, but it drives the biggest swing.
• Current R-value versus target R-value. San Antonio is in IECC Climate Zone 2, which means R-38 is the comfortable target for attic insulation. If your house was built in the early 2000s, it probably has R-19 or R-30 up there. The gap between what you have and R-38 determines how many inches we blow and how much material we use. A top-up is always cheaper than a full install.
• Whether old insulation needs to come out. Rodent damage, water stains from a valley leak, or decades of compressed fiberglass all mean removal first. In older San Antonio neighborhoods like Government Hill or Beacon Hill, we see this constantly. Removal runs $0.50 to $1.70 per square foot on top of the install.
• Material choice. Fiberglass runs 10 to 15 percent less than cellulose per square foot, but cellulose provides better air-sealing properties because it’s denser. In San Antonio, where summer attic temperatures can hit 150 degrees, that density difference matters. We match the material to the house, not to whatever’s left on the truck.
• Access and attic configuration. Low-slope roofs, tight attic hatches in 1960s ranch homes, ductwork running everywhere, recessed lights that need covering before we blow – all of it adds labor time. Homes in Alamo Heights with vaulted ceilings or finished attic spaces are the most common culprit here.
• Air sealing scope. This is the single best value-add when you’re blowing in insulation, but it adds cost. Sealing top plates, wire penetrations, plumbing chases, and can lights before we blow means your R-38 actually performs like R-38. We recommend it on nearly every San Antonio home because our summer heat loads are brutal. Without air sealing, you’re paying to insulate a sieve.

Blown-In Insulation vs. Other Options: What’s the Cost Difference in San Antonio?

Homeowners ask us this in every estimate. Here’s how the main insulation types stack up in this market.

Blown-In Fiberglass: $1.10 – $2.10 per sq. ft.

The workhorse. Fast to install, good coverage, lower material cost. It doesn’t settle as much as it used to, but it still loses some R-value in high heat if it’s not installed to the right density. We use Owens Corning AttiCat and Johns Manville Climate Pro most often.

Blown-In Cellulose: $1.35 – $2.30 per sq. ft.

Made from recycled newsprint treated with borates for fire and pest resistance. It’s denser, which means better air-sealing, and it holds its R-value better in extreme heat. GreenFiber is the brand we run. In San Antonio’s attic-baking summers, cellulose performs measurably better than loose fiberglass, which is why we recommend it more often than not.

Spray Foam (Open-Cell): $2.50 – $5.00 per sq. ft.

Open-cell spray foam installed directly on the roof deck turns your attic into conditioned space. It’s more expensive, but for homes with HVAC equipment in the attic – and that’s most San Antonio homes, because our slabs don’t leave room for basement units – it can cut cooling bills by 20 to 30 percent. We install Icynene and Demilec open-cell foams. Not the right fit for every budget, but on a 2,000-square-foot house it’s often the best long-term play.

Spray Foam (Closed-Cell): $4.00 – $8.00 per sq. ft.

High R-value per inch, moisture barrier built in, and serious money. Closed-cell is rarely the right call for attics in our climate, but it shows up on crawl spaces and some wall retrofits. We’ll tell you straight if you don’t need it. That’s the point of a written price – it’s a recommendation, not a sales pitch.

For context on how blown-in compares as a service category, see our page on Blown-In Insulation in San Antonio for the full breakdown of what the job entails.

How to Save on Blown-In Insulation in San Antonio

A few practical ways to keep the bill down without cutting corners.

• Time it with the seasons. Insulation contractors in San Antonio are slammed from May through September because everyone suddenly remembers their electric bill. We keep steady pricing year-round, but if your schedule is flexible, booking a January or February install means faster scheduling and sometimes a better rate on material bundles.
• Bundle air sealing with the blow. The marginal cost of sealing your attic penetrations while we’re already up there is a fraction of what it would cost as a standalone visit. You’ll typically save $200 to $400 by doing both at once.
• Don’t over-insulate the wrong space. R-60 in a San Antonio attic is overkill. The point of diminishing returns hits around R-38 to R-44 for our climate. Some contractors will happily sell you extra inches you’ll never feel. We won’t.
• Check CPS Energy rebates. CPS Energy runs periodic home-efficiency rebate programs that include insulation upgrades. The availability changes, but when the rebate is live, it can knock $200 to $600 off a blown-in project. Ask us when you call – we track these and pass the savings through.
• Get a real written estimate, not a phone guess. A legitimate quote requires square footage, current R-value, and access assessment. Free estimates matter, and ours are genuinely free. Call (254) 279-0971 and we’ll price it exactly.

Is Blown-In Insulation Worth It in San Antonio?

Short answer: yes, if you have less than R-30 in your attic. Here’s the local math.

San Antonio sees an average of 43 days per year above 100 degrees. Your attic gets considerably hotter than that. When your ceiling insulation is thin, that heat radiates into your living space and your HVAC system fights it all afternoon. A properly insulated and air-sealed attic in this city typically cuts cooling costs by 15 to 25 percent. On a $300 summer electric bill, that’s $45 to $75 a month from May through September.

The payback window for a $2,400 blown-in job is usually two to four years in San Antonio. That’s better than almost any home improvement you can make, and the comfort change is immediate. You’ll notice the difference in the room underneath the attic hatch within a day.

We’ve been doing this work since 2003 as part of the Relay Home Co. family, and the takeaway from every summer is the same: the houses that stay comfortable in August are the ones with real insulation and real air sealing, not the ones with builder-grade R-19 blown in a hurry twenty years ago.

Why We Price the Way We Do

Our owner, Chase Whitaker, started Laurel Attic Insulation with a simple rule: every job gets a written price before work starts. No range, no “it depends on what we find,” no adjusting the number at the door. You see the exact cost, the exact material, and the exact scope on paper before we pull a single hose off the truck.

That price comes with the full Relay Visibility Guarantee. You book, you get a live arrival time, you see before-and-after photos of the work, and you pay from a link when it’s done. We’re the only insulation company in San Antonio operating under that standard.

And if it’s not done right? The 365-Day Done Right Promise covers it in writing for a full year. If the repair fails, the second visit is free. No argument, no fine print, no chasing us down.

Do we pick up the phone? Yes. A live person answers, 24 hours a day, seven days a week. No voicemail queue, no callback ticket. You call, a human answers. That’s the Relay Standard.

Frequently Asked Questions – Blown-In Insulation Cost

How much does blown-in insulation cost per square foot in San Antonio?

Blown-in insulation runs $1.10 to $2.30 per square foot in San Antonio for materials and labor combined, with fiberglass at the lower end and cellulose at the higher end. A full attic install on a 1,500-square-foot house typically lands between $1,650 and $3,450. Call (254) 279-0971 for a free, written estimate on your specific home.

Is it cheaper to do blown-in insulation yourself?

The materials for a DIY blown-in job run $400 to $800 for a 1,500-square-foot attic, and big-box stores will rent you the blower machine for free when you buy their bags. But here’s what you’re not paying for: air sealing, proper depth checks, R-value verification, and not spending a Saturday in a 140-degree attic with fiberglass dust settling into your lungs. The labor portion of a pro install is typically $500 to $1,000. Most homeowners tell us that’s worth it. We’ll price your job and you can decide.

How long does blown-in insulation last in San Antonio?

Loose-fill fiberglass and cellulose maintain their R-value for 20 to 30 years in San Antonio’s climate, assuming the attic stays dry and pest-free. Cellulose can settle by 10 to 15 percent in the first year, which is why we blow it slightly thicker than target depth. Our 365-Day Done Right Promise covers any settling issues in the first year, and we’ll top it up free if it dips below the specified R-value in that window.

Can you blow insulation over existing insulation in my attic?

Yes, as long as the existing insulation is dry, pest-free, and not compressed. Blowing over the top of R-19 fiberglass to reach R-38 costs $900 to $2,100 for most San Antonio homes, which is significantly less than a full remove-and-replace. If the old insulation is water-damaged, rodent-infested, or packed down to nothing, removal runs $800 to $2,500 and is worth it. We’ll tell you which path you need during the free estimate, and you’ll see the exact number in writing.

Does blown-in insulation reduce energy bills in San Antonio?

Most homeowners see a 15 to 25 percent reduction in cooling costs after bringing their attic to R-38 with proper air sealing. On a typical San Antonio summer bill of $250 to $350, that’s $35 to $85 per month during peak heat. The typical payback period is two to four years, and the effect lasts for decades. Our free estimates include a projection based on your home’s square footage and current insulation depth.

Get Your Blown-In Insulation Priced – In Writing

You don’t have to guess what blown-in insulation will cost in your San Antonio home. Call (254) 279-0971 and we’ll schedule a free estimate. You’ll get a written, line-item price before any work starts, a live arrival time, and photo proof of every step. That’s how Laurel Attic Insulation does it, and we’ve been doing it that way since 2003. Get back to the home page to explore more, or pick up the phone and get the number you actually need.

Written by Chase Whitaker, Owner at Laurel Attic Insulation San Antonio, serving San Antonio since 2003.

Pricing reflects the San Antonio market as of 2026. Laurel Attic Insulation San Antonio offers free estimates – call (254) 279-0971.