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

How Much Does Attic Insulation Cost in San Antonio?

Our Attic Insulation services in San Antonio typically cost between $1,200 and $3,800 for a full installation, with most homes falling in the $1,600 to $2,600 range depending on square footage and the R-value you’re targeting. That dollar range covers blown-in fiberglass or cellulose for the average 1,500 to 2,000 square foot attic. Spray foam runs higher, usually $3,000 to $6,800 for the same space, because the material and labor costs are steeper.

Those numbers are for the San Antonio market specifically. Labor rates here run lower than Austin or Dallas, but our summers push R-value recommendations higher than what you’d find in cooler parts of the country. That combination lands most homeowners in the $1.50 to $2.80 per square foot range for traditional insulation and $2.00 to $4.50 per square foot for spray foam.

Call Attic Insulation Near Me in San Antonio, TX at (254) 279-0971 for a written, line-item price on your specific attic before any work starts. Estimates are free, and you’ll get the number in writing, not a verbal guess.

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

Attic Insulation Cost Breakdown (2026)

Here’s what you’re actually paying for on an attic insulation job in San Antonio right now. These are the real line items, the way a contractor builds the quote.

What drives the total up or down

The single biggest factor is your attic’s square footage. A 1,000 square foot attic in a Stone Oak townhome runs on the low end of every range above. A 3,000 square foot attic in a Dominion ridge-top house runs on the high end. The second biggest factor is your current R-value. If your attic already has R-19 and you’re topping it up to R-38, you’re paying roughly half what you’d pay for a bare attic starting from scratch.

San Antonio’s climate guidance from the Department of Energy sets our zone at R-38 to R-60 for attics. Most homes built in the 1980s and 1990s around Alamo Heights, Terrell Hills, and Castle Hills have R-11 to R-19 sitting up there right now, which means Attic Insulation Replacement or a significant top-up is usually on the table. Homes built before 1970 in neighborhoods like Monte Vista or Olmos Park often have no insulation under the decking at all, and some still have the old rock wool or, if you’re unlucky, vermiculite that should be tested and removed.

Laurel Attic Insulation San Antonio prices by the job, not by the hour, and you’ll see the written total before we touch anything. No surprise line items, no “we found an extra $600 of work” conversation at the end.

What Affects Attic Insulation Pricing in San Antonio

• Your current R-value. If you’re at R-0 to R-11, you need a full install. If you’re at R-19 or R-30, you need a top-up, which cuts material and labor time roughly in half. We check this during the estimate.
• Attic accessibility. Some older San Antonio homes in the near-downtown neighborhoods like Tobin Hill and Alta Vista have narrow scuttle holes and low roof pitches. That slows installation and adds a labor premium.
• Air sealing scope. Sealing penetrations around plumbing stacks, electrical runs, and the attic hatch before blowing insulation costs from $400 to $1,100 and is a one-time cost with lasting payoff. It’s the difference between insulation that looks good and insulation that actually performs in July.
• Material type. Fiberglass is cheapest. Cellulose runs slightly more. Rockwool batts are a specialty product with a premium. Spray foam is the most expensive up front but offers the highest performance per inch, which matters if you’re trying to bring a scissor-truss attic into your conditioned envelope.
• Removal of existing insulation. If squirrels or raccoons got in, or if there’s moisture damage from a roof leak, or if you have old vermiculite that needs testing for asbestos, removal adds $900 to $2,000 before new material goes down.
• Time of year. San Antonio’s insulation contractors are busiest in May and June right before peak summer. Booking in the fall or winter can sometimes mean faster scheduling, though Laurel holds our written prices regardless of season.

DIY vs. Professional Attic Insulation in San Antonio

You can rent a blower from a home improvement store for about $35 a day and buy 30 bags of blown-in fiberglass for around $450 total, which makes DIY look tempting at roughly $500 all-in versus our $1,200 to $2,200 range. Here’s what that math misses.

First, air sealing. A DIY blow over an unsealed attic delivers maybe 60% of the performance of a professionally installed job because all the gaps around recessed lights, top plates, and the attic hatch stay open. Heat flows through those gaps regardless of how many inches of fiberglass sit on top of them. Second, the cheaper fiberglass sold at retail stores loses R-value in our summer attic temperatures because of how it settles and how it handles the extreme thermal swing from 140°F daytime attic heat to cooler nights. Third, without proper baffles and ventilation checks, poor DIY installs trap moisture against the roof deck, and with San Antonio’s humidity that turns into mold in two seasons.

We’ve done second-visit remediations on dozens of DIY jobs around Westover Hills and Helotes where the homeowner saved $800 and then spent $2,500 fixing the result. The honest truth: you can do it yourself, but unless you understand air sealing, ventilation, and material density, you’re buying a half-effective insulation layer.

Attic Insulation R-Value in San Antonio: What You Actually Need

R-value is the number that measures how well insulation slows heat from moving through your ceiling. The higher the number, the more resistance.

For San Antonio, the Department of Energy places us in Climate Zone 2, where the recommendation for attics is R-38 to R-60. Most homes here have R-11 to R-19, which means they’re under-insulated by anywhere from half to three quarters of what they should have. That’s not a guess; it’s what we find on estimate walkthroughs across San Antonio every week, from newer builds in Cibolo and Schertz to turn-of-the-century homes in King William.

Here’s how that translates to cost. To get from R-11 to R-38, you need roughly 10 to 12 inches of blown-in fiberglass added, which runs about $0.90 to $1.40 per square foot for the top-up alone. To get to R-60, you’re looking at 18 to 20 inches, which adds about 40% to the material cost. Whether R-60 is worth it in San Antonio depends on your home’s age and envelope. For a 1980s ranch in Northwood with single-pane windows, R-38 plus air sealing gets you 90% of the benefit at two-thirds the price. For a new build where you’re aiming for low utility bills from day one, go R-60.

Spray foam changes the conversation. Closed-cell foam delivers about R-6.5 per inch, so 4 inches on the roof deck gives you R-26 and also air-seals the entire attic. That’s why spray foam jobs cost more but eliminate the separate air sealing line item entirely.

Spray Foam vs. Blown-In: Cost and Performance in San Antonio

This is the question we get on almost every estimate call, so let’s put numbers on it.

Blown-in fiberglass or cellulose over the attic floor runs $1.50 to $2.60 per square foot in San Antonio and gets you to R-38 or R-49. That’s the right call for most homes with a ventilated attic and no HVAC equipment or ductwork in the attic space. It’s cheaper, it’s fast, and it works.

Spray foam applied to the roof deck runs $2.90 to $4.80 per square foot for open-cell and $3.50 to $5.80 for closed-cell, and it creates what’s called an unvented, conditioned attic. That means the attic becomes part of your home’s thermal envelope, which makes sense if your furnace, air handler, or ductwork lives up there. Many San Antonio homes built since the 1990s have HVAC systems in the attic, and in those cases, a 140°F attic in August is fighting your AC system every minute the system runs. Moving the thermal boundary to the roof deck changes that equation.

Clay, Alamo Heights, and the in-loop neighborhoods have plenty of homes where the attic is unconditioned and the HVAC is on a closet platform on the first floor. For those, blown-in plus air sealing is the best value. For a two-story home in Stone Oak with all the ductwork in a hot attic, spray foam on the roofline is often the better long-term play despite the higher up front cost.

Laurel Attic Insulation installs both, and we’ll tell you which makes sense for your specific house. We carry materials from Owens Corning, Rockwool, Icynene, Demilec, CertainTeed, Johns Manville, Knauf, and GreenFiber, matched to the job instead of whatever is sitting on the truck.

How to Save on Attic Insulation in San Antonio

There are a few real ways to bring the number down without cutting corners that will cost you later.

• Air seal at the same time. Paying for air sealing as part of the insulation job costs less than doing it later as a separate visit, and it makes every inch of insulation perform better. You’ll feel the difference in the first July electric bill.
• Check with CPS Energy. CPS runs rebate and incentive programs for residential energy upgrades at various points during the year. The terms change, so call them or check their site before your estimate, and we’ll help you file the paperwork if you qualify.
• Top up instead of full replacement. If your existing insulation is dry, pest-free, and not moldy, blowing new material on top is half the cost of removal and replacement. We’ll tell you honestly if your attic qualifies.
• Don’t over-insulate to R-60 unless you’re staying long term. The energy savings between R-38 and R-60 in San Antonio are real but modest for most homes. Spend the difference on air sealing instead, and you’ll get more comfort per dollar.
• Book in the slower season. Demand for Attic Insulation in San Antonio peaks in May and June. If you can schedule in November or January, you may get faster dates, though Laurel’s written pricing stays consistent year-round.

Laurel Attic Insulation San Antonio gives free estimates with a written dollar figure before any work starts. Call (254) 279-0971 and we’ll send a technician to measure your attic, check your R-value, and hand you a fixed price on the spot.

FAQs – Attic Insulation Cost

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

Blown-in attic insulation runs $1.50 to $2.80 per square foot installed in San Antonio, and spray foam runs $2.90 to $5.80 per square foot depending on open-cell versus closed-cell and the depth applied. Those figures include labor, materials, and cleanup. For an exact per-square-foot price on your attic, call Laurel Attic Insulation San Antonio at (254) 279-0971 for a free written estimate.

Is it cheaper to repair or replace attic insulation?

It is almost always cheaper to Attic Insulation Top-Up than to remove and replace it. If the existing material is dry and intact, adding blown-in fiberglass to reach R-38 costs $0.90 to $1.40 per square foot, versus $1.50 to $2.60 per square foot for full removal and new installation. The exception is when there’s contamination from pests, mold, or roof leaks, in which case removal is non-negotiable. Laurel Attic Insulation San Antonio will give you an honest read on which path you need; call (254) 279-0971 for a free assessment.

How much does it cost to insulate an attic of 1,500 square feet?

For a 1,500 square foot attic in San Antonio, you’ll typically pay $1,800 to $2,800 for blown-in fiberglass to R-38, $2,100 to $3,400 for blown-in cellulose to R-38, and $3,500 to $6,000 for spray foam to the roofline. Air sealing adds $400 to $1,100. That range covers most single-story homes built between the 1970s and 2000s in neighborhoods like Castle Hills, Oak Hills, and Dellview. Call (254) 279-0971 and we’ll give you a written quote based on actual measurements, not a square-footage guess.

What is the R-value recommended for San Antonio attics?

The Department of Energy recommends R-38 to R-60 for attics in San Antonio’s climate zone. Since most San Antonio homes have R-11 to R-19, a top-up to R-38 typically costs $900 to $1,800 for 1,500 square feet and delivers the biggest comfort and energy-bill improvement for the money. R-60 is worth considering for new builds or if you plan to stay in the home for 15 or more years. Laurel Attic Insulation San Antonio tests your existing R-value during the free estimate; call (254) 279-0971 to schedule yours.

How long does it take to insulate an attic in San Antonio?

A standard 1,500 square foot blown-in attic job in San Antonio takes one day from start to finish, including setup, air sealing, blowing the material, and cleanup. Spray foam on the roofline typically takes one to two days, depending on the roof geometry and whether existing insulation needs to be pulled down first. Laurel Attic Insulation San Antonio gives you a live technician tracking link so you see exactly when we arrive, and we send before-and-after photos of the finished work before we ask you to pay. Call (254) 279-0971 to get on the schedule.

Can you come today to give an estimate?

In most cases, yes. Laurel Attic Insulation San Antonio answers calls with a live person 24/7, and we can often get a technician to your door the same day you call for an estimate on attic insulation. No voicemail, no callback queue, no four-hour waiting window. Call (254) 279-0971 and we’ll give you a live arrival time for your estimate.

Why Homeowners in San Antonio Call Laurel Attic Insulation

The reason is simple, and it’s written on every job we do. A written price before work starts. Live technician tracking. Photo proof of every job from start to finish. That’s the Relay Visibility Guarantee, and Laurel Attic Insulation San Antonio is the insulation specialist in the Relay Home Co. family. We’ve been doing this in San Antonio since 2003, and we’re still here because we do what we say.

Every job also carries our 365-Day Done Right Promise. If something isn’t right within a year of installation, we come back and make it right. In writing, on every invoice. And if a repair fails, the second visit is free. No charge, no argument.

You’ll deal with a real person from the first call to the final invoice, which you can pay from a link when the job is done and the photos are in your hand. No door-step price changes. No vague arrival windows. No phone tag.

Laurel stays green all year, so should your home’s comfort. That’s the idea behind the name.

If you’re home in San Antonio and your attic needs attention, start with a free estimate. Call (254) 279-0971 and we’ll give you a written price before anything starts.

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

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