Frequently Asked Questions
We get a lot of the same questions before a job starts, so we’ve gathered the most common ones here. If yours isn’t on the list, a live person at Walt’s Insulation picks up the phone 24/7 at (866) 751-4428.
Pricing & Estimates
How much does insulation service cost in San Antonio?
Most insulation jobs in San Antonio range from $800 to $4,500, depending on the service type, the square footage involved, and the current condition of what’s already in place. Attic blown-in insulation for a 1,500 sq ft home typically runs $1,200 to $2,200; spray foam on a crawl space or rim joist runs higher, often $1,800 to $3,500; radiant barrier installation for a standard San Antonio attic tends to land in the $900 to $1,600 range. These are real-market figures for this area – your exact number depends on attic height, existing insulation depth, and accessibility. Call (866) 751-4428 for a free, no-trip-charge estimate and we’ll give you a written number before anything starts.
| Service | Typical San Antonio Price Range |
|---|---|
| Attic blown-in insulation (1,500 sq ft) | $1,200 – $2,200 |
| Spray foam insulation (crawl space / rim joist) | $1,800 – $3,500 |
| Radiant barrier installation | $900 – $1,600 |
| Crawl space encapsulation & vapor barrier | $1,500 – $4,000 |
| Insulation removal & replacement | $1,400 – $3,200 |
| Wall insulation (existing home) | $1,000 – $2,800 |
Do you offer free estimates?
Yes – every estimate from Walt’s Insulation is free, and there’s no trip charge for homes inside our service county. We give you a written, upfront price before any work begins, so there are no surprises on the invoice. If you’ve already gotten a written estimate from someone else, we’ll give you a free second opinion on it – no pressure, just an honest comparison. Call (866) 751-4428 to schedule yours.
Do you have any discounts or current offers?
We offer a permanent 10% discount for seniors and veterans – always, not just during a promotion. We also take $40 off any repair over $200. If you have a written estimate from another company, the free second opinion we offer often saves homeowners more than a coupon would. These are standing offers, not limited-time deals.
What payment methods do you accept?
Walt’s Insulation accepts all major credit cards, checks, and cash. For larger jobs, we can walk you through financing options during the estimate visit. We never ask for full payment upfront – you pay when the job is complete and you’re satisfied.
Is it cheaper to repair or replace my insulation?
In most San Antonio homes we visit, adding insulation on top of existing material is the more affordable path when what’s there is dry, uncontaminated, and still in decent shape. Replacement becomes necessary when there’s moisture damage, pest activity, or compression that’s taken the material well below its rated R-value. During a free estimate we check actual R-values with a probe, not just a visual guess – that gives you a real answer instead of a sales pitch. Call (866) 751-4428 and we’ll tell you honestly which route makes sense.
Scheduling & Service Area
What areas do you serve?
Walt’s Insulation serves San Antonio and the surrounding communities throughout Bexar County and neighboring areas. We regularly work in neighborhoods across San Antonio including the Alamo Heights corridor, Stone Oak, Helotes, Leon Valley, Converse, and the far south side near Lackland. If you’re on the edges of our range, call us – we’d rather confirm we can help than have you guess. There’s no trip charge for jobs inside our service county.
How fast can you respond?
For standard estimates and scheduled jobs in San Antonio, we typically have openings within 1 to 3 business days. Emergency situations – a burst pipe that soaked your attic insulation, post-storm damage, or a sudden air quality concern – get prioritized. A live person answers our phone 24/7, so you’re never leaving a message and waiting to hear back. That’s (866) 751-4428, any time.
Do you offer emergency insulation service?
Yes. When a situation can’t wait – storm damage that’s exposed your attic, water intrusion that’s soaked through the floor of a crawl space, or a rodent infestation that’s contaminated existing insulation – we respond as quickly as possible. Because our phones are answered live around the clock, you can reach a real person at Walt’s Insulation at any hour to start that conversation. San Antonio’s summer heat means a compromised attic isn’t just an energy problem; it becomes a comfort and even a health issue fast. Don’t wait until Monday.
How does the scheduling process work?
- Call or contact us at (866) 751-4428 – a live person picks up, any time of day or night.
- Describe what you’re dealing with – we’ll ask a few quick questions about your home’s size, age, and what you’ve noticed (high bills, uneven temps, visible gaps).
- Schedule a free on-site estimate – we confirm a date and arrival window that works for you, with no trip charge inside the service county.
- We inspect and measure – our background-checked, uniformed technician checks actual R-values, looks for air leaks, and photographs anything unusual.
- You get a written upfront price – before we touch anything, you see the full number. No surprises.
- We do the work and you sign off – payment comes after you’re satisfied the job is done right.
Licensing, Insurance & Trust
Are you licensed and insured?
Yes. Walt’s Insulation is a state-licensed, insured, and bonded contractor operating out of a published address in the San Antonio area. We’re not a franchise, not a pop-up operation, and not an 800-number call center that dispatches whoever’s available. Walt Brenner has owned and operated this business since 2000, which means there’s a real person accountable for every job – not a corporate layer to hide behind.
Do you guarantee your work?
Every job Walt’s Insulation completes is backed by the Done Right Promise – our lifetime workmanship guarantee. If something isn’t right, we come back and fix it. No runaround, no finger-pointing at the material manufacturer, no charge. This isn’t a limited warranty with a list of exclusions printed in small type; it’s a straightforward commitment that reflects 25 years of standing behind our work in San Antonio. You can read more about what that means on our home page.
Who will be coming to my house?
Every technician Walt’s Insulation sends to your home is background-checked and arrives in a uniform. You’ll know who’s at your door before they knock – we’re not dispatching anonymous subcontractors. This matters to us because it matters to homeowners who’ve had contractors show up in an unmarked car with no ID. That’s not how we operate.
How long has Walt’s Insulation been in business?
Walt Brenner founded Walt’s Insulation in 2000, which means we’ve been working in San Antonio and the surrounding area for over 25 years. In that time we’ve seen the city grow, watched energy codes tighten, and watched plenty of competitors come and go. We’re still here because we fix problems we caused, answer the phone when people call, and don’t disappear after the check clears.
Specific Services
Do you handle attic insulation?
Attic insulation is one of our most requested services in San Antonio, and for good reason – with summer attic temperatures regularly hitting 140-160°F here, an under-insulated attic is one of the biggest drivers of high utility bills in Bexar County. We install blown-in fiberglass and cellulose, batts, and spray foam in attics depending on what the space calls for. We use products from Owens Corning, Johns Manville, Knauf, and GreenFiber, and we match the material to the application rather than pushing whatever’s cheapest to install. Learn more on our Attic Insulation in San Antonio page, or call us for a free inspection and written estimate.
Do you handle spray foam insulation?
Yes – spray foam is one of the most effective air-sealing options available, and Walt’s Insulation installs both open-cell and closed-cell spray foam from brands including Icynene and Demilec. In San Antonio homes, we most often apply closed-cell foam to crawl space walls, rim joists, and areas where moisture resistance matters alongside insulation value. Open-cell foam works well in attic cavities where you want a full air barrier without the added cost of closed-cell. We’ll tell you which is appropriate for your specific situation during the estimate – not whatever yields a higher ticket.
Do you handle blown-in insulation?
Blown-in insulation is the most common upgrade we do in existing San Antonio homes because it goes in without tearing open walls or ceilings. We use cellulose (GreenFiber) and fiberglass (Owens Corning, Johns Manville, Knauf) depending on the application. In attics with limited headroom or irregular joist spacing – which we see a lot in older homes in the Monte Vista and Highland Hills areas of San Antonio – blown-in fills gaps that batts simply can’t reach. The process is fast, clean, and covered by the Done Right Promise.
Do you handle crawl space encapsulation and vapor barrier installation?
Yes. Crawl space encapsulation is something we recommend more often than homeowners expect, because San Antonio sits in a climate zone where humidity moves up through unprotected crawl spaces and creates moisture problems that go well beyond insulation – mold, wood rot, and pest activity often follow. A proper encapsulation job includes sealing the floor with a heavy-mil vapor barrier, insulating the walls, and addressing any drainage or ventilation issues before closing things up. We use materials rated for long-term performance, and the work is covered by the Done Right Promise like everything else we do.
Do you handle radiant barrier installation?
Radiant barriers are one of the most cost-effective upgrades for San Antonio homes specifically because of how intense the solar gain is here from May through September. We install reflective radiant barrier sheeting in attics to reduce the radiant heat load hitting your insulation and ceiling – which directly reduces how hard your AC works during peak hours. It’s not a replacement for adequate insulation, but paired with proper attic insulation it can make a noticeable difference on your CPS Energy bill. We’ll tell you honestly during the estimate whether it’s worth it for your home’s current setup.
Do you handle insulation removal and replacement?
Yes, and it’s a service more San Antonio homeowners need than realize. Old blown-in or batt insulation that’s been compressed, saturated by a roof leak, or contaminated by pests loses most of its thermal value and can create indoor air quality problems. We vacuum out old material, sanitize the space when needed, and install fresh product before the job is considered done. If your attic has any sign of rodent activity, we also offer attic cleaning and rodent proofing as part of the same project so you’re not putting new insulation on top of an old problem.
Do you do home energy audits?
We offer home energy audits as a starting point for homeowners who want to understand where they’re losing conditioned air before committing to any specific upgrade. An audit in a San Antonio home typically includes checking attic insulation depth and R-value, looking for bypasses and air leaks around fixtures and framing, and inspecting the crawl space if one exists. The findings shape the recommendation – sometimes the answer is more insulation, sometimes it’s air sealing, and sometimes it’s both. We’d rather you spend money on what actually solves the problem.
Do you handle wall insulation in existing homes?
Yes. Retrofitting wall insulation in an existing San Antonio home is more involved than attic work, but it’s doable without gutting the interior. We use blown-in methods through small drilled holes in the exterior siding or interior drywall – holes that are patched as part of the job. Older homes in areas like Beacon Hill and Dellview often have hollow wall cavities with no insulation at all, and adding even R-13 makes a measurable difference in both comfort and utility costs. If you’re not sure what’s in your walls, that’s something we check during a home energy audit.
Key Takeaways
- Free estimates with no trip charge inside our service county – written upfront pricing before any work begins.
- Live person answers every call, 24/7 at (866) 751-4428 – no voicemail, no answering service.
- All work covered by the Done Right Promise – lifetime workmanship guarantee, no exceptions.
- Permanent 10% discount for seniors and veterans and $40 off any repair over $200.
- Background-checked, uniformed technicians on every visit – you know exactly who’s coming.
- Locally owned and operated by Walt Brenner since 2000 – a real name, real address, real license number.
- Products from Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Demilec, Knauf, and GreenFiber.
- Services include attic insulation, blown-in, spray foam, radiant barrier, crawl space encapsulation, wall insulation, insulation removal, attic cleaning, and home energy audits.
Ready to Get a Straight Answer?
If you have a question that’s not here, or you’re ready to book a free estimate, call Walt’s Insulation at (866) 751-4428. A live person picks up around the clock – not a machine, not a call center. Walt Brenner built this business on being reachable and accountable, and that starts with actually answering the phone. San Antonio homeowners get upfront pricing, no trip charge inside our service county, and every job backed by the Done Right Promise. Call us today and we’ll give you a straight answer.
Have a question we didn’t cover? Call Walt’s Insulation at (866) 751-4428.
Written by Walt Brenner, Owner at Walt’s Insulation, serving San Antonio since 2000.