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

How Much Does Attic Air Sealing Cost in Cedar Park?

Attic air sealing in Cedar Park, TX typically costs between $850 and $2,200 for a standard single-story home, with most jobs landing around $1,200 to $1,500 when the attic is accessible and the existing insulation doesn’t need to be pulled first. Larger two-story homes or attics with heavy penetration counts – think older builds in Buttercup Creek or Ranch at Cypress Creek with dozens of recessed can lights – can push toward the higher end of that range.

Attic Air Sealing Cost Breakdown (2026)

Attic air sealing in Cedar Park runs across a fairly predictable range once you know what drives each line item. The table below reflects what jobs in this market have actually cost in 2025-2026, not national averages pulled from a database somewhere.

A few things worth knowing about how these numbers shake out in Cedar Park specifically. The city’s housing stock skews toward 1990s-to-2010s construction – neighborhoods like Forest Oaks, Buttercup Creek, Twin Creeks, and Sendero Springs all share a common trait: they were built when recessed lighting was having its moment, and those older can lights are among the worst air leakage points in any attic. A blower-door test – a pressurization reading that shows, in one number, how much conditioned air the building envelope is losing – on a typical 2,100 sq ft Cedar Park home from that era often reads 3,800 to 5,500 CFM50 before sealing. After a thorough job that addresses top plates, can lights, plumbing and electrical penetrations, and the attic hatch, that number routinely drops to 1,800 to 2,800 CFM50. That documented before-and-after figure is what you should expect from any contractor doing this work – not a feel-good claim, a number.

At Envelope Insulation Co. – operating as Topside Attic Insulation Cedar Park – Wes Okafor’s crew documents those blower-door readings on every applicable job. The written price comes before any work starts, every time. That’s not a policy we added recently; it’s been the foundation since 2016 under what we call the Haven Standard.

What Affects Attic Air Sealing Pricing in Cedar Park

Six factors move the price on virtually every job we quote in Cedar Park. None of them are vague – each one has a measurable effect on time, materials, or difficulty.

• Attic square footage and layout: Cedar Park’s larger homes in Buttercup Creek Estates or Avery Ranch often have split attic spaces broken up by structural elements and HVAC equipment. Every section the crew has to navigate adds time, and time is the biggest cost driver in air sealing. A 3,200 sq ft footprint with two separate attic spaces can cost 25-35% more than a simple open attic of the same square footage.
• Number and type of penetrations: Recessed can lights, attic hatches, plumbing stacks, exhaust fans, electrical junction boxes, and HVAC boots are all separate air leakage points that need individual attention. A home with 40 recessed cans – not unusual in a Cedar Park build from 2002 to 2012 – requires more material and time than one with 12. We count penetrations during the estimate so the written price reflects the actual scope.
• Existing insulation condition: In Cedar Park’s climate – hot summers with attic temperatures regularly hitting 150°F or higher – insulation degrades faster than it does in more temperate climates. When existing blown-in fiberglass has settled below R-19 or is contaminated with moisture from a past roof leak, it usually needs to come out before sealing begins. That removal step, roughly $400-$700 per 500 sq ft depending on depth, adds meaningfully to the total.
• Attic access and clearance: Older homes in Cedar Park near Buttercup Creek or the original Twin Creeks sections sometimes have attic access points that are undersized or awkwardly placed near HVAC units. Tight clearances slow the work and occasionally require minor framing modification, which affects labor cost. Newer construction in areas like Whitestone Estates tends to have better access – which is one reason a quote on a 2018 build might come in lower than a comparable 2000 build across town.
• HVAC ducts in the attic: Cedar Park has a high percentage of homes with all ductwork run through the attic – which is the worst possible location from an energy standpoint given local summer temperatures. When ducts are present, the crew has to work around them carefully, and duct sealing (separate from attic air sealing) sometimes gets identified during the same visit. We quote duct sealing separately if it’s needed; it’s not bundled into attic air sealing pricing without disclosure.
• Whether air sealing is combined with insulation installation: Scheduling air sealing and blown-in insulation as a single mobilization – air sealing first, insulation second, in that order – is more efficient than two separate visits. Most Cedar Park homeowners who need both services save $200-$400 on combined labor compared to booking them separately. We don’t install insulation before sealing is complete, which means the combined job is also the correct job from a building science standpoint.

Why Cedar Park Homes Leak More Than You’d Expect

Cedar Park sits in Williamson County at the edge of the Hill Country, where the soil expands and contracts significantly with seasonal moisture swings. That movement works on a home’s framing over time, and the gaps that open at top plates – the horizontal framing members at the top of interior walls, where the wall meets the attic floor – can be substantial in homes more than 10 years old. We see this pattern consistently in Ranch at Cypress Creek and the older sections of Forest Oaks, where slab movement has created seam separations that weren’t there when the home was built.

The Texas summer heat is also relevant in a specific way: attic temperatures in Cedar Park can exceed 150-160°F on a July afternoon, creating a strong stack effect – warm air trying to rise and escape through every available gap while pulling hot attic air down through penetrations in the ceiling plane. A home with poor attic air sealing is essentially running its air conditioner harder to compensate for conditioned air it’s continuously losing. Properly sealed attics in Cedar Park homes routinely show 15-25% reductions in measured air changes per hour after sealing, and some older builds in Buttercup Creek have come in even higher than that.

Wes Okafor and the crew at Attic Air Sealing in Cedar Park have been documenting these results since 2016. The blower-door readings go in the record. The photos go in the record. You get both before we leave.

Air Sealing vs. Adding More Insulation: The Order Matters

This is the conversation that comes up on nearly every job, and it’s worth addressing directly. Adding insulation without sealing the attic floor first is like insulating a window with the glass removed – you’re managing temperature transfer but doing nothing about the air moving through the gaps. In Cedar Park’s climate, where the temperature delta between attic and living space is extreme, air movement through an unsealed ceiling plane carries far more heat energy than conduction through the insulation itself.

The building science on this has been settled for years: seal first, then insulate. The reason more contractors don’t follow this sequence is that blowing in insulation is faster and generates more revenue per hour than the careful, penetration-by-penetration work of air sealing. We don’t blow insulation over an unsealed attic floor. That’s a line we don’t cross, and it’s the reason we document the sealing work before any insulation goes in – so the sequence is provable, not just claimed.

From a pure cost standpoint, doing both in the right order on a single visit is more cost-effective than having two contractors or two visits. A Cedar Park home that needs air sealing and R-38 blown-in insulation combined typically runs $2,400 to $4,200 depending on square footage – less than the sum of the two services booked separately.

How to Save on Attic Air Sealing in Cedar Park

There’s a limited number of ways to genuinely reduce the cost of attic air sealing without compromising the result. Here’s what actually works:

• Combine it with insulation work. If your insulation needs upgrading anyway – and in a Cedar Park home more than 12 years old, it almost certainly does – scheduling air sealing and insulation together reduces mobilization costs. On a single visit, the labor overlap saves you money. We quote them together and price them transparently so you can see exactly where the savings come from.
• Get a second opinion on any written estimate. We offer a free second opinion on any competing written estimate. Bring us the quote, and Wes Okafor or another member of the team will read through it with you – scope by scope – so you can judge whether the comparison is apples-to-apples. Sometimes a lower quote covers less. Sometimes a higher quote has redundancies. Either way, you should know before you sign.
• Check for utility rebates before signing anything. Oncor and Pedernales Electric Cooperative have both offered rebates in recent years for documented air sealing and insulation improvements in qualifying homes. The programs change year to year and require specific documentation – which is another reason the before-and-after blower-door readings and photo record matter. Ask us to identify what documentation would be needed for current rebate programs at the time of your estimate.
• Get the estimate before summer. Cedar Park attic work is in higher demand from April through September when homeowners feel the heat bills. Scheduling in winter or early spring – January through March – often means faster scheduling and, sometimes, more flexibility on pricing. It also means your home is sealed before the worst of the summer heat cycle.
• Don’t pay for insulation removal you might not need. Some contractors quote insulation removal as a standard line item regardless of whether the existing material is usable. During our estimate walk, we assess the existing insulation honestly. If it’s viable and the air sealing can be done around it, we’ll tell you that. Removal is quoted only when it’s actually necessary – contaminated material, rodent damage, or insulation so degraded it would undermine the sealing work.

For a written price on your specific attic, call (737) 245-6428. The estimate is free, the price is written before any work starts, and there’s no obligation to book. That’s Haven Standard Clause 1 – not a sales tactic, just how we operate.

What You Should Receive When the Job Is Done

This matters more than most homeowners realize when they’re shopping for bids. A written price before work starts is the baseline – you should refuse any contractor who won’t provide one. But the documentation at the end of the job is equally important, because it’s the only way to verify that air sealing actually occurred rather than just being invoiced.

When Envelope Insulation Co. completes an attic air sealing job in Cedar Park, you receive:

• A documented photo record showing the attic condition before work, the sealing materials applied at each penetration and top plate, and the finished state – included on every job, not available on request.
• Before-and-after blower-door readings (CFM50 figures) showing the measured improvement in your home’s air tightness – on every applicable job.
• A written warranty under the 365-Day Done Right Promise. If something isn’t right, we come back and make it right. That’s in writing before we start, not offered after the fact if you push for it.
• The written scope of work as completed, so you have a record of exactly what was sealed, what materials were used, and where.

These aren’t extras. They’re what leaving looks like on every job we run in Cedar Park.

Comparing Quotes: What the Differences Actually Mean

When you’re looking at two or three quotes for attic air sealing in Cedar Park and they’re not close in price, the difference is almost always one of three things: scope, materials, or documentation.

A quote that doesn’t specify which penetrations will be addressed, what materials will be used at each location, or whether a blower-door test is included is an incomplete quote – and an incomplete quote is an invitation to a dispute later. Two-part closed-cell spray foam at top plates and penetrations performs differently than rope caulk. Foam dam covers on can lights perform differently than cardboard. If the quote doesn’t name the materials, it’s worth asking before you accept it.

The documentation question is simpler: if there’s no blower-door reading before and after the work, you have no way to verify that air sealing occurred at any meaningful level. You’re taking the contractor’s word for it. We publish the numbers because they’re the only honest answer to “did the work actually work?”

Under the Haven Standard, we’ll read any written competing estimate with you – free, no obligation. If another contractor’s quote is genuinely better for your situation, we’ll tell you. If it’s missing scope that will cost you later, we’ll point that out too. Call (737) 245-6428 to schedule that conversation.

FAQs – Attic Air Sealing Cost in Cedar Park

How much does attic air sealing cost in Cedar Park, TX?

Most attic air sealing jobs in Cedar Park run between $850 and $2,200 for the sealing work itself, with the majority of single-story homes in the 1,500-2,500 sq ft range landing around $1,050 to $1,600. Two-story homes or attics with high penetration counts – common in older sections of Buttercup Creek and Twin Creeks – can reach $2,200 or more. Call (737) 245-6428 for a written price on your specific home; the estimate is free and comes with no obligation.

Is attic air sealing worth the cost in a hot climate like Cedar Park?

In Cedar Park’s climate, where attic temperatures hit 150-160°F in summer and the stack effect pulls conditioned air up and out through ceiling gaps continuously, air sealing typically pays back faster than in moderate climates. Homes that started with blower-door readings of 4,000+ CFM50 and were sealed down to 2,000-2,500 CFM50 have documented cooling load reductions that correspond to measurable drops in monthly utility bills. The payback period varies by home, but for Cedar Park builds from 1995-2015 with original insulation and unsealed penetrations, it is usually 3-6 years on energy savings alone – not counting the comfort improvement.

Can attic air sealing be done without removing existing insulation?

Yes, in most Cedar Park homes it can. When existing insulation is intact and above a minimum viable R-value, the crew works through it to reach the penetrations at the ceiling plane. Removal is necessary when insulation is contaminated (moisture, rodent activity), severely degraded, or so deep that sealing work can’t be done accurately beneath it. During the estimate walk, we assess the existing material and tell you honestly whether removal is required. If it is, it’s quoted separately so you can see the cost before deciding. Removal typically adds $400-$700 per 500 sq ft to the total.

How long does attic air sealing take on a typical Cedar Park home?

A standard air sealing job on a 1,800-2,400 sq ft Cedar Park home with normal attic access takes 4 to 8 hours for a two-person crew. Larger homes, split attic layouts, or jobs that combine air sealing with insulation installation run 6-12 hours or can span two days. We give you a time estimate alongside the written price scope so you know what to expect before the crew arrives.

What is a blower-door test, and should I ask for one?

A blower-door test is a pressurization reading – a large fan is mounted in a door frame, the house is depressurized, and a meter measures how much air moves through the building envelope in cubic feet per minute at 50 pascals of pressure (CFM50). That single number tells you, precisely, how leaky your home is. Before-and-after readings are the only objective way to confirm that air sealing work actually reduced air leakage. On every applicable job we run in Cedar Park, we document both numbers. If a contractor won’t provide before-and-after blower-door documentation, you’re being asked to take their word that the work performed. For a home in Buttercup Creek, Forest Oaks, or anywhere else in Cedar Park, that documentation is available as a standalone service (roughly $250-$450 if not bundled) or included as part of a full air sealing job. Call (737) 245-6428 to ask specifically what documentation your estimate includes.

Does Envelope Insulation Co. / Topside Attic Insulation provide a warranty on air sealing work?

Yes. The 365-Day Done Right Promise applies to every completed job: if anything about the work isn’t right within 365 days, we come back and make it right. That promise is in writing before we start – it’s not something you have to ask for after the fact. The written warranty is part of the written scope delivered under Haven Standard Clause 1. You have both documents before anyone picks up a tool.

Key Takeaways

• Attic air sealing in Cedar Park costs $850 to $2,200 for most homes, with a typical single-story job running $1,050 to $1,600.
• The biggest cost drivers are attic square footage, number of recessed can lights and penetrations, and whether existing insulation needs to come out first.
• Cedar Park’s housing stock – heavy on 1995-2015 construction with lots of recessed lighting and HVAC in the attic – makes air sealing a higher-return investment than in many other markets.
• Air sealing always comes before insulation. Blowing insulation over an unsealed attic floor addresses conduction but does nothing for the air moving through gaps – which carries more heat energy in a Texas climate.
• Before-and-after blower-door readings (CFM50) are the only objective proof that air sealing reduced actual air leakage. Ask for them in writing.
• Combining air sealing with insulation installation in a single visit saves $200-$400 in labor compared to two separate jobs.
• Every job from Envelope Insulation Co. includes a written price before work starts, a documented photo record, and the 365-Day Done Right Promise in writing.

Get a Written Price for Your Cedar Park Home

If your Cedar Park home was built before 2015, runs high cooling bills through summer, or you’ve never had a blower-door test done, our Attic Air Sealing services estimate is the right starting point. Wes Okafor and the crew at Envelope Insulation Co. have been documenting these jobs – with written prices, blower-door readings, and photo records – since 2016. We work across Cedar Park, from the older sections near Buttercup Creek and Ranch at Cypress Creek to newer builds in Whitestone Estates and Sendero Springs.

The estimate is free. The price is written before any work starts. Call (737) 245-6428 to schedule – a live person answers, no voicemail loop, no callback window measured in business days.

Pricing reflects the Cedar Park market as of 2026. Topside Attic Insulation Cedar Park offers free estimates – call (737) 245-6428.

Written by Wes Okafor, Owner at Envelope Insulation Co. / Topside Attic Insulation Cedar Park, serving Cedar Park since 2016.