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

How Much Does Attic Insulation Cost in Boerne?

Attic Insulation Near Me in Boerne, TX typically runs between $1,400 and $3,800 for a standard single-story home, with most jobs landing around $1,900 to $2,600 once air sealing is included. That range covers blown-in fiberglass or cellulose to R-38 or R-49 in an 1,800-to-2,400-square-foot attic – the most common project size we see in Boerne’s Hill Country neighborhoods. If your attic already holds some insulation and only needs a top-up, the cost drops considerably; a full tear-out and replacement runs toward the higher end.

Attic Insulation Cost Breakdown (2026)

The table below reflects current labor and material costs in the Boerne market. Prices assume a standard accessible attic with no major obstructions and no significant mold or rodent remediation needed beforehand.

What the Numbers Above Don’t Include

The table above is for the insulation and air-sealing work itself. A few things can add to that figure depending on what the attic looks like when we open the hatch:

• Attic cleaning and rodent proofing: Boerne sits in Hill Country terrain where roof rats and squirrels are active year-round. If they’ve been in the attic, the contaminated insulation has to come out before new material goes in. That adds $400 to $1,200 depending on the extent.
• HVAC duct sealing: Leaky ducts running through an unconditioned attic can wipe out most of the benefit from new insulation. If we find ducts that aren’t sealed, we’ll quote that as a separate line item before anything starts.
• Attic access improvements: Tight or mispositioned hatches slow down the job. A new pull-down stair or larger hatch runs $300 to $600 and is worth it if the technician is going to spend a full day up there.

A Note on Air Sealing

At Envelope Insulation Co., air sealing is never optional or added as an upsell after the price is quoted – it’s a hard prerequisite. We will not blow insulation over an unsealed attic floor. The reason is straightforward: in Boerne’s climate, a well-insulated but leaky attic still pushes hot air through every gap in the ceiling, and the insulation slows the heat transfer while the air leakage bypasses it entirely. Sealing first – top plates, can light housings, plumbing penetrations, electrical chases – and insulating second is the correct sequence, and it’s the only sequence we use.

On applicable jobs, we measure air leakage with a blower-door test – a pressurization reading, expressed as CFM50, that shows in a single number how much air the building envelope is losing. You get the before number and the after number, both in writing, so there’s no question what changed.

What Affects Attic Insulation Pricing in Boerne

Boerne isn’t a generic Texas suburb. The Hill Country geography, the age of the housing stock, and Kendall County’s specific building environment all push costs in directions you won’t see on a national pricing calculator. Here are the factors that move the number most:

• Attic square footage and shape: Most homes in Boerne’s newer developments off Scenic Loop Road and John’s Road run 1,800 to 2,800 square feet of conditioned space, which typically means 1,400 to 2,200 square feet of attic floor. Hip roofs – common in newer construction here – reduce the accessible floor area but create more complex framing that slows sealing work. That labor time shows up in the price.
• Current R-value and existing material condition: If your attic already has R-19 of settled fiberglass batts from 2001, we may be able to blow cellulose directly over the top to reach R-49 without removal. If the existing material is compressed, wet from a slow roof leak, or contaminated, it has to go first. We assess this during the estimate – you get a written scope that specifies exactly what’s there and what’s recommended before any price is agreed.
• Boerne’s climate zone position: Boerne sits right at the boundary between IECC climate zones 2 and 3, which matters for code and for comfort. Summers regularly hit 100-plus degrees, and the thermal load on an under-insulated attic shows up fast in July electric bills. We typically recommend R-49 for homes in Boerne, one step above R-38, because the payback calculation favors it here. That extra depth adds cost upfront but the CPS Energy or Pedernales Electric summer bills respond noticeably.
• Attic accessibility and height: Older homes along Esser Road or near the Boerne historic district sometimes have attic heights under 30 inches at the center peak and even less at the edges, making manual air sealing physically difficult. Low-clearance attics take longer to seal properly, and that time is priced honestly in the written scope you receive before work starts.
• Insulation material choice: Blown-in cellulose and blown-in fiberglass are close in performance and similar in cost at comparable R-values – cellulose runs slightly less per bag in today’s material market. Open-cell spray foam applied to the underside of the roof deck costs significantly more but converts the attic to a conditioned space, which benefits homes with HVAC equipment or ductwork up there. Closed-cell foam – from manufacturers like Icynene or Demilec – is typically reserved for targeted applications like kneewalls or rim joists rather than full attic coverage, because the cost per R-value is higher.
• Radiant barrier pairing: In Boerne’s sun exposure, a foil radiant barrier stapled to the underside of the rafters before blown-in insulation reduces radiant heat gain through the roof deck. This is a straightforward add-on that costs $700 to $1,500 depending on attic size. It pairs well with R-38 or R-49 blown-in because they target different heat transfer mechanisms – the barrier blocks radiation, the insulation slows conduction.

How to Save on Attic Insulation in Boerne

Combine Air Sealing and Insulation in One Visit

Scheduling air sealing as a separate job from insulation means two separate mobilization costs, two sets of setup and cleanup, and two days with a crew in the attic. When the work is scoped together, the combined price is lower than the sum of two separate quotes – usually by $200 to $400 on a standard Boerne-area job. We quote it that way by default because it’s the correct sequence anyway: seal, then insulate.

Check for Utility Rebates Before You Sign Anything

Pedernales Electric Cooperative – which serves a significant portion of the Boerne and Kendall County area – has offered rebates for qualifying attic insulation improvements in recent years. CPS Energy, which covers some areas closer to the 1604 corridor, has similar programs. Rebate availability and amounts change, so verify directly with your utility provider, but on a $2,400 job even a $200 to $400 rebate changes the net cost noticeably. We can help you confirm what documentation a rebate application will require, since we provide a written scope and documented photo record on every job anyway.

Don’t Pay for Removal You Don’t Need

Not every attic in Boerne needs a full Attic Insulation Replacement. If the existing insulation is dry, free of contamination, and at or above R-11, there’s a reasonable case for blowing additional material over the top to reach target R-value. We’ll tell you honestly what we find and what we’d recommend. You get a written price for both options if it’s a close call, and you decide.

Get a Second Opinion on Any Written Quote

Under the Haven Standard, we offer a free second opinion on any written estimate you’ve received from another contractor. Bring us the quote – we’ll read through it with you, explain what each line item means in trade terms, and tell you whether the scope makes sense for your specific attic. There’s no obligation. If the competing quote is solid, we’ll say so.

Time the Job Before Peak Summer

By May and June in Boerne, attic temperatures can hit 140 degrees by midday, which limits the working hours per day and can extend labor time. Scheduling in February through April – or in October and November – means the crew can work a full day in the attic, which keeps labor costs where they should be. Material prices don’t change seasonally in any meaningful way, but labor efficiency does.

For a written price specific to your home’s attic, call (830) 529-7780. We quote in writing before any work starts – that’s Haven Standard Clause 1, and it applies to every job without exception.

Typical Boerne-Area Scenarios: What We See and What It Costs

Generic price ranges only go so far. Below are three real-world scenarios that reflect the homes and attic conditions we see regularly in Boerne and the surrounding Kendall County area. Specific job details have been generalized, but the scope and cost ranges are drawn from actual work completed here.

Scenario 1: 2008 Build in the Cordillera Ranch Area

A 2,200-square-foot home with original R-19 batt insulation, not air sealed at the top plates or can lights. The attic is accessible, 42 inches of clearance at peak, and the existing material is in acceptable condition. Scope: air seal top plates, 18 can-light boxes, and all plumbing penetrations; blow cellulose to R-49 over existing batts. Blower-door test before and after. Total written price: $2,200. After-sealing blower-door reading dropped from approximately 3,400 CFM50 to 1,750 CFM50 – roughly a 48% reduction in measured air leakage.

Scenario 2: 1994 Build Near the Boerne City Center

A 1,600-square-foot home with original blown fiberglass that had settled to approximately R-9, with evidence of a previous slow roof leak in one corner – the insulation in that section was matted and partially discolored. Scope: remove all existing insulation via vacuum extraction, remediate the wet section, air seal attic floor penetrations, blow new fiberglass to R-38, install foil radiant barrier to rafter underside. Total written price: $3,600. The homeowner had received one prior quote that did not include removal or air sealing – the scope difference explained the apparent price gap.

Scenario 3: Top-Up Only, Newer Home in Fair Oaks Ranch Adjacent

A 2019-build with R-30 blown fiberglass already in place. Homeowner wanted to reach R-49 before summer. Attic was already air-sealed at the builder stage – we confirmed this with a blower-door reading before quoting. Scope: blow additional blown-in fiberglass over existing material to bring the total to R-49, document final depth with photos. No removal, minimal air sealing needed. Total written price: $780.

Boerne Insulation Permits and Code Notes (2026)

Kendall County and the City of Boerne both operate under the International Residential Code (IRC) as adopted by Texas. For attic insulation specifically, there is no separate permit required in most cases for insulation replacement or addition in an existing home – the work is considered a maintenance-class improvement. However, if the scope includes structural attic access improvements or HVAC duct modifications, a permit may be required depending on the scope.

For new construction or gut-renovation projects within the Boerne city limits, the energy code requirements align with IECC 2021 in most cases, which specifies a minimum of R-49 for attic insulation in climate zone 3 and R-38 for zone 2. Given that Boerne sits at the zone 2/3 boundary, we default to R-49 recommendations for all Boerne-area homes to ensure code compliance regardless of which zone the jurisdiction applies.

If you’re pulling a broader renovation permit that includes insulation work, the inspector may want to verify installed depth. We document installed depth in the photo record we provide at job completion – that documentation is available for permit submissions if needed.

FAQs – Attic Insulation Cost in Boerne

How much does attic insulation cost in Boerne, TX in 2026?

Most attic insulation jobs in Boerne run between $1,400 and $3,800, with the most common scope – air sealing plus blown-in insulation to R-38 or R-49 in a 1,800-to-2,400-square-foot home – landing between $1,900 and $3,200. Full replacement projects that include old insulation removal tend to run $2,800 to $4,800. These are Boerne-market figures based on current material and labor costs; a written price for your specific attic will be more accurate than any range on this page. Call (830) 529-7780 and we’ll produce that written price before any work is scheduled.

Is it cheaper to add insulation on top of old insulation or replace it?

Attic Insulation Top-Up costs significantly less – typically $800 to $1,600 compared to $2,000 to $3,200 for full replacement – but it only makes sense if the existing material is dry, uncontaminated, and above R-11. If there’s rodent activity, moisture damage, or severe settling, adding on top traps the problem and degrades the new material over time. We assess the existing condition during the estimate and give you both options in writing when it’s a reasonable choice. Call (830) 529-7780 for a written assessment of your specific attic.

Does attic insulation in Boerne require a permit?

For most attic insulation replacement or addition jobs in existing Boerne homes, no separate insulation permit is required under Kendall County and City of Boerne codes. Work involving structural changes to attic access or modifications to HVAC equipment may trigger permit requirements depending on the scope. If your project is part of a broader permitted renovation, we provide a documented photo record and installed-depth documentation that can support the permit file.

How long does attic insulation installation take in Boerne?

A standard air-seal-plus-blown-in job in a 1,800-to-2,400-square-foot Boerne home typically takes one full day with a two-person crew. Full removal-and-replacement jobs run one to two days depending on attic access and the volume of material being extracted. Spray foam applications on a full roof deck take one to two days and require a 24-hour cure window before the attic can be re-entered. We include the expected timeline in the written scope you receive before any work starts.

What’s the best type of insulation for a Boerne attic?

For most Boerne homes, our Attic Insulation services using blown-in fiberglass or cellulose to R-49 – combined with thorough air sealing – delivers the best cost-to-performance ratio given the local climate. The combination targets both conductive heat transfer (what insulation handles) and convective air movement (what air sealing handles). Radiant barriers add value in Boerne because radiant heat load from the roof deck is high during the four-plus months of 90-degree-plus weather. Open-cell spray foam applied to the roof deck is the right answer when HVAC equipment lives in the attic, because it creates a conditioned space rather than an unconditioned one. The correct answer depends on your attic configuration – we’ll give you a specific recommendation in writing after we look at it.

Why the Sequence Matters More Than the Material

There’s a version of this job that looks fine on paper – new insulation, correct R-value, reputable material from Owens Corning or Knauf or Johns Manville – and still underperforms because air sealing was never done first. In Boerne’s summers, with attic temperatures regularly above 130 degrees, conditioned air finding any gap in the ceiling plane is the dominant energy loss mechanism in a lot of homes. Insulation slows heat moving through the drywall; it doesn’t stop pressurized air moving through a gap around a recessed light housing or an unsealed top plate.

We’re not the only contractor in the area who understands this, but we are the only one who treats it as a hard prerequisite – not something the homeowner has to ask for, not an add-on quoted separately after the insulation price is agreed. Sealed first, then insulated. That’s the sequence, and the before-and-after blower-door numbers we publish on applicable jobs show what the sequence produces.

If you’ve already received a quote that doesn’t include air sealing, bring it to us. Under the Haven Standard, we offer a free second opinion on any written estimate – we’ll read through it with you and explain what’s included and what isn’t.

What You Receive When We Finish

Every job at Envelope Insulation Co. closes with the same documentation regardless of the project size:

• A Documented Photo Record showing conditions before work started and the finished installation – included on every job, not available on request.
• A written warranty delivered before the crew leaves, specifying what’s covered and for how long.
• On applicable jobs, before-and-after blower-door readings – the CFM50 figure before sealing and the CFM50 figure after – so you can see the measured air-sealing result in one number rather than taking our word for it.
• A copy of the written scope that was agreed before work started, for your records.

The 365-Day Done Right Promise applies to all completed work. If something isn’t right within a year of project completion, we come back and make it right. That’s written into the warranty, not a verbal commitment made at the door.

About This Page and Our Work in Boerne

Envelope Insulation Co. has been independently owned and operated under The Haven Standard since 2016. Since then, the team has sealed and insulated more than 9,000 homes, every one with a written price before work started and a documented record when the crew left. Wes Okafor leads the team and has been directly involved in developing the Haven Standard approach – the requirement that air sealing precede insulation on every applicable job, that prices are written before work starts, and that blower-door numbers are published rather than summarized.

The work we do in Boerne reflects what the Hill Country climate actually demands: attics that get brutally hot for months at a time, older housing stock in and around the historic district that was often built with minimal air sealing, and newer developments in areas like Cordillera Ranch or Fair Oaks Ranch that may have builder-grade insulation adequate at the time but below current R-49 recommendations.

You can learn more about our approach on our home page, or go directly to our full Attic Insulation in Boerne service page for scope details, material options, and how to schedule a written estimate.

Get a Written Price for Your Boerne Attic

If you want to know what attic insulation will actually cost for your specific home in Boerne, the only accurate answer comes from someone who has looked at your attic. We’ll assess what’s there, tell you what we’d recommend and why, and give you a flat written price – before any work is scheduled, before any material is ordered, before anyone lifts a tool. That’s Haven Standard Clause 1, and it applies to every job without exception.

Call (830) 529-7780 to schedule your free estimate. A live person will answer – no voicemail, no callback window. If you’ve already received a written quote from another contractor and want a second opinion on it, bring it along. We’ll read it with you.

Pricing reflects the Boerne, TX market as of 2026. Written by Wes Okafor, Owner at Envelope Insulation Co. / Topside Attic Insulation Boerne, serving Boerne since 2016. Topside Attic Insulation Boerne offers free estimates – call (830) 529-7780.