Trusted Attic Insulation for San Antonio Homeowners
Attic Insulation pricing in San Antonio typically runs $1,500 to $3,800 for a full replacement in a 1,500 to 2,200 square foot home, with blown-in fiberglass at $1.40 to $2.10 per square foot installed. Most jobs are completed in a single day. If your upstairs rooms feel ten degrees warmer than downstairs every August or your electric bill hit $300 last July, your attic is likely under-insulated, and we can fix that.
Walt’s Insulation has been insulating attics in San Antonio since 2000. We’re the one down the road, not an 800 number in another state. Walt Brenner started this business with a simple rule: answer the phone, show up on time, and stand behind the work like your name is on the siding. That’s why every job carries our Done Right Promise, a lifetime workmanship guarantee that means exactly what it says. Call (866) 751-4428 and a live person answers, day or night.
Key Takeaways:
- Attic insulation in San Antonio runs $1,500 to $3,800 for a typical full replacement
- Most jobs are done in one day; top-ups can be done in under three hours
- We’re locally owned and owner-operated since 2000, with a published address and license number
- Anyone over 65 or with military service gets 10% off, always
- Free second opinion on any written estimate, no trip charge in Bexar County
What Our Attic Insulation Service Includes
Blown-In Attic Insulation
Blown-in insulation is loose material, usually fiberglass or cellulose, that’s blown into your attic floor with specialized equipment to create an even thermal blanket. It fills gaps and odd angles that batt insulation can’t reach, which matters in San Antonio homes where framing around chimneys, vents, and recessed lights leaves gaps. We install Owens Corning and GreenFiber blown-in insulation to whatever R-value your home needs, typically R-38 to R-49 in our climate zone, and we’ll verify the depth with a measuring card before we pack up.
Attic Batt Insulation
Batt insulation comes in pre-cut rolls or blankets, usually fiberglass from CertainTeed or Knauf, and works well in attics with consistent joist spacing and few obstructions. It’s a good option when you want a clean, uniform look you can walk past and inspect yourself. We cut each batt to fit snugly around vents, framing, and access hatches, because a two-inch gap around a bathroom fan can cost you as much as a missing window when it comes to heat transfer.
Attic Insulation Top-Up
A top-up means adding new insulation on top of what’s already up there, which works when your existing insulation is still sound but just not deep enough for San Antonio summers; check our Attic Insulation Maintenance Checklist for San Antonio Homeowners to see if yours qualifies. Most homes built before 2010 have R-19 to R-30 at best; current recommendations call for R-38 or higher. We’ll check your existing material for moisture damage or rodent contamination first, and if it’s still good, we’ll blow fresh insulation right over it at a fraction of the cost of a full replacement.
Attic Insulation Replacement
Sometimes the old insulation has to come out first. Rodent droppings, water damage from a roof leak, or insulation that’s been compressed to half its original R-value all mean it’s doing more harm than good; see Attic Insulation Troubleshooting: Common Problems and How to Fix Them for more warning signs. We remove the old material with commercial vacuums, clean the attic deck, and install fresh insulation to current code. This is the right call when you see water stains on your ceiling or when an inspection turns up evidence of pests.
Attic Baffles & Ventilation Prep
Baffles are small channels that keep insulation from blocking the airflow from your soffit vents into your attic. Without them, insulation can literally suffocate your attic, trapping heat and moisture that cook your shingles from underneath and warp your decking. We install baffles in every rafter bay before blowing insulation, and we’ll evaluate your ventilation setup so you’re not paying to cool air that can’t move.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for Attic Insulation
We install CertainTeed batt insulation regularly, and our installers know the product’s compression characteristics well enough to hit the exact R-value printed on the label, not just “close enough.” CertainTeed’s fiberglass also holds up well in San Antonio’s humidity, which matters when your attic hits 140 degrees in July and moisture is looking for somewhere to settle.
For blown-in cellulose, we use GreenFiber because the material settles predictably and we can calculate exactly how many bags your square footage needs, no guessing. For homeowners doing spray foam or hybrid approaches, we work with Demilec and Icynene products where the application calls for it. Whether you’ve got a brand preference or just want the right material for your house, we’ll tell you straight what works and what doesn’t in our climate. Need more info about the insulation home page covers? Start there for an overview of everything we do.
Signs You Need Attic Insulation Right Now
- Upstairs rooms won’t cool below 80 in August. In San Antonio, a properly insulated attic keeps second-floor bedrooms within a few degrees of the first floor. If you’re running the AC nonstop and still sweating upstairs, your attic insulation is failing or too thin.
- Your energy bill jumped 20% or more year over year. CPS Energy rates have climbed, but a sudden spike that doesn’t match your usage pattern usually means heat is pouring through your ceiling. Attic insulation is the cheapest energy upgrade you can make per dollar of savings.
- You can see the tops of your ceiling joists. In most San Antonio homes, insulation should be deep enough to cover the joists completely. If you can walk through your attic and count the framing, you’re under-insulated by at least half.
- Rooms feel drafty in winter and stuffy in summer. Insulation doesn’t just keep heat out; it keeps conditioned air in. If your house can’t hold temperature between HVAC cycles, your attic envelope is leaking.
- You hear every rainstorm like it’s on the roof above your bed. Insulation adds a layer of sound dampening. If your attic is essentially a tin can, adding R-38 or better will quiet things down while it lowers your bills.
Our Attic Insulation Process - Step by Step
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Inspection and measurement. We start with a full attic assessment: measuring existing depth, checking for moisture, looking for rodent activity, and evaluating ventilation. We take photos so you can see exactly what we see.
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Straightforward estimate. You get a written quote with the exact square footage, the material we’ll use, the R-value we’ll hit, and the total price. No vague ranges, no “we’ll see when we get up there” surprises. And if you already have a written estimate from another company, we’ll give you a free second opinion.
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Prep and air sealing. Before any insulation goes in, we seal the gaps that let conditioned air escape: around plumbing vents, electrical boxes, and the attic hatch. Insulation without air sealing is like wearing a down jacket with the zipper open.
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Insulation installation. Whether it’s blown-in, batt, or a top-up, our uniformed, background-checked technicians do the work with laser focus on even coverage and correct depth. We check with a depth gauge as we go so you’re getting what you paid for.
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Cleanup and verification. We walk the attic with you (or show you photos if you’d rather not climb), verify the final depth, and confirm your attic looks better than when we arrived. Then we back it with the Done Right Promise, in writing, for life.
How Much Does Attic Insulation Cost in San Antonio?
A typical blown-in attic insulation job in San Antonio runs $1,500 to $2,800 for a 1,500-square-foot attic, including baffles and basic air sealing. Full replacement with old insulation removal adds $700 to $1,500 depending on how much material has to come out. Batt insulation generally runs $1.80 to $2.60 per square foot installed depending on the R-value and brand. Top-ups are the cheapest option, usually $800 to $1,600, because you’re not paying for removal.
Price depends on three things: the square footage of your attic, the condition of what’s already up there, and whether you need air sealing or baffle work. The biggest mistake homeowners make is comparing quotes based on price alone without checking what’s actually included. A bid that’s $400 cheaper might skip the air sealing, use lower R-value material, or “forget” the baffles. Our estimate lists every component, and we’ll walk you through it line by line before you sign anything.
We include a free, no-trip-charge estimate anywhere in Bexar County. Seniors and veterans always get 10% off. And if you already have a written estimate, bring it in; we’ll give you a free second opinion. Call (866) 751-4428 for an exact quote.
Attic Insulation Near San Antonio - Our Service Area
We serve all of San Antonio and Bexar County, including Alamo Heights, Stone Oak, Helotes, Converse, and Schertz, usually with same-week scheduling. If you’re out toward Boerne or down toward Floresville, we’ll still come to you, often with a next-day slot. For homeowners outside the San Antonio area, take a look at our Attic Insulation in Houston page, our Attic Insulation in Spring coverage, or Attic Insulation in The Woodlands if you’re up north. Wherever your house is, a real person answers when you call.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio area and know this community well, so you can find Attic Insulation near you with a local team. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Attic Insulation in San Antonio
Attic insulation is a thermal barrier installed in the space between your top-floor ceiling and your roof, most commonly fiberglass or cellulose blown in or laid as batts. Its job is to slow heat transfer so your conditioned air stays inside and San Antonio’s 100-degree heat stays out. The effectiveness is measured in R-value; the higher the number, the better the resistance to heat flow.
Most attic insulation jobs in San Antonio are finished in one business day, usually four to six hours for a standard 1,500-square-foot attic. A top-up can take as little as two to three hours, while a full replacement with removal might stretch to a full day plus a few hours. We’ll give you a realistic time window when we schedule, and we call if anything changes.
Attic insulation in San Antonio generally costs $1,500 to $3,800 depending on the size of your attic, the material you choose, and whether old insulation needs to be removed first. Top-ups are the cheapest option at $800 to $1,600, while full replacements with air sealing run at the higher end. Call (866) 751-4428 for a free, no-trip-charge estimate and we’ll give you an exact number for your house.
Yes, we install and service CertainTeed batt insulation, GreenFiber blown-in cellulose, and Demilec spray foam products, along with materials from Owens Corning, Rockwool, Icynene, Johns Manville, and Knauf. We’ll recommend the right product for your attic based on your budget, your home’s construction, and San Antonio’s climate. If you have a written estimate specifying a particular brand, we’ll match it or explain why a different material would serve you better.
We answer calls 24/7, and we often have same-day or next-day availability for emergency situations like insulation that’s been soaked by a roof leak. For standard installations, we typically schedule within the same week. If your attic is exposed after storm damage or a fire, call (866) 751-4428 right away and we’ll prioritize you.
Every attic insulation job we do is covered by the Done Right Promise, our lifetime workmanship guarantee. If the insulation settles, the R-value doesn’t meet spec, or the work simply isn’t done right, we make it right on our dime, no runaround, no fine print. That’s been our policy since Walt Brenner started this company in 2000, and it’s why we’re still here.
Clear a path to your attic access, whether that’s a hallway hatch or a garage ladder, and move any vehicles from the driveway so we can park the equipment truck close by. You don’t need to clear out the attic itself, we’ll work around stored items or move them carefully as needed. If you have pets, secure them in a back room while we’re working, and plan to stay home or provide access information before we arrive.
Schedule Your Attic Insulation Service in San Antonio Today
Ready to stop paying to cool your attic? Call (866) 751-4428 for a free, no-obligation estimate on attic insulation in San Antonio. A live person answers, day or night, and we’ll get you scheduled fast. Seniors and veterans save 10% on every job, always. Get the one down the road on your side.
Written by Walt Brenner, Owner at Walt’s Insulation, serving San Antonio since 2000.