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

Insulation in Sunnyvale, CA

Crawl space encapsulation and vapor barrier installation in Sunnyvale typically runs $3,800-$7,500 for homes under 2,000 square feet, with most jobs completed in two days. Sunnyvale’s 1950s-1970s tract homes-built for aerospace workers with minimal insulation standards-now face PG&E’s punishing electricity rates, making envelope upgrades pay back faster than homeowners expect. We start every job with a written price and a blower-door test so you know exactly what you’re buying. Call (650) 352-3577 for a free estimate.

Call (650) 352-3577

Why Sunnyvale Homes Are Different

Sunnyvale’s residential neighborhoods are dominated by 1950s-1970s tract homes built to house workers at Lockheed Missiles & Space, Westinghouse, and Sylvania during the aerospace boom. These properties were constructed with 2×4 framing and minimal insulation standards, and many slab-on-grade ranch homes from the 1950s-60s were built with no perimeter wall insulation at all on the interior side-just drywall against the stud bay. Opening a single wall for a kitchen remodel regularly reveals this, turning a small job into a whole-house assessment conversation.

Sunnyvale sits inside PG&E’s service territory, which carries some of the highest residential electricity rates in the United States. The Bay Area microclimate delivers significant summer diurnal swings-afternoon temperatures pushing into the upper 80s-90s while nights drop into the mid-50s-meaning radiant barriers and air sealing directly reduce afternoon peak cooling loads, exactly when time-of-use rates are most punishing. The persistent morning marine layer also drives attic moisture accumulation that compresses and degrades older fiberglass batts faster than homeowners expect. Sunnyvale’s building department enforces Title 24 energy compliance on permitted work, so any renovation can trigger mandatory insulation upgrades that homeowners don’t anticipate.

Our Main Sunnyvale Services

Most Sunnyvale homeowners who call us start with attic work or spray foam, but blown-in remains the workhorse for retrofitting these older tract homes.

Attic Insulation in Sunnyvale

Attic insulation in Sunnyvale means dealing with settled fiberglass from the 1960s and 1970s that no longer meets code-minimum performance, especially in neighborhoods like Birdland and Cherry Chase where the original aerospace-era homes remain largely intact. We remove or supplement existing material, air seal the attic floor first, then install to current Title 24 standards with a written scope and documented photo record. Attic Insulation in Sunnyvale details our full process and blower-door verification.

Spray Foam Insulation in Sunnyvale

Spray foam insulation in Sunnyvale makes sense for homeowners finishing basements, adding ADUs, or dealing with the uninsulated perimeter walls common in 1950s-60s slab ranch homes. We use open-cell and closed-cell products from Owens Corning and Johns Manville, specifying the correct density for each application. Every spray foam job includes a written price before work starts and a 365-Day Done Right Promise. Spray Foam Insulation in Sunnyvale covers applications and pricing in detail.

Blown-In Insulation in Sunnyvale

Blown-in insulation in Sunnyvale is the most cost-effective way to bring an underinsulated attic up to code, particularly in the single-story ranch homes that dominate the city. We blow GreenFiber or Knauf fiberglass over a fully sealed attic floor, never over unsealed top plates or can light penetrations. The job typically completes in one day with before-and-after blower-door numbers provided. Blown-In Insulation in Sunnyvale explains material options and what to expect.

Crawl Space Encapsulation & Vapor Barrier in Sunnyvale

Crawl space encapsulation and vapor barrier installation in Sunnyvale addresses a specific problem in the city’s older tract homes: perimeter foundations with inadequate moisture protection and vented crawl spaces that admit the marine layer’s damp air year-round. Many 1950s-1970s homes in the Lockheed-era neighborhoods were built with minimal ground barriers or none at all, and the persistent morning fog in Sunnyvale’s microclimate keeps these spaces chronically wet. Crawl Space Encapsulation & Vapor Barrier covers our full service line, but here’s what Sunnyvale homeowners specifically need to know.

Crawl Space Vapor Barrier

Signs you need it

Your crawl space has standing water after rain, visible mold on floor joists, or a musty smell that rises through the floor registers.

What it costs in Sunnyvale

A 6-mil to 20-mil vapor barrier installed over bare ground in a Sunnyvale crawl space typically runs $1,800-$3,500 depending on square footage and whether we need to remove old, torn polyethylene first.

How we do it

We remove debris and old barrier material, grade the soil for drainage, seam-seal a new reinforced polyethylene sheet at all overlaps, and seal it to foundation walls with mechanical fasteners and mastic.

Crawl Space Encapsulation

Signs you need it

You’re running dehumidifiers constantly, seeing rusted ductwork, or finding that fiberglass batts between joists are sagging and waterlogged.

What it costs in Sunnyvale

Full encapsulation with closed-cell spray foam on walls, sealed vapor barrier on floor, and mechanical dehumidification typically ranges $5,500-$12,000 for Sunnyvale homes under 2,500 square feet.

How we do it

We seal all vents, apply closed-cell foam to foundation walls and rim joists, install a continuous sealed vapor barrier across the floor and up walls, then add a condensate-pumped dehumidifier sized to the space.

What Crawl Space Encapsulation & Vapor Barrier Costs in Sunnyvale

Does crawl space work require a permit in Sunnyvale?

Vapor barrier-only jobs typically don’t, but encapsulation with foam insulation and electrical for dehumidifiers triggers Title 24 compliance review through Sunnyvale’s building department. We handle permit documentation as part of our written scope.

How long does crawl space encapsulation take?

Most Sunnyvale crawl spaces finish in two to three days, with dehumidifier electrical work sometimes adding a day if a dedicated circuit is needed. You’ll get a written schedule before anyone starts.

Radiant Barrier Installation in Sunnyvale

Radiant barrier installation in Sunnyvale directly targets the afternoon peak cooling loads that drive PG&E bills into the stratosphere. The city’s summer diurnal swings-upper 80s and 90s by mid-afternoon, mid-50s by midnight-mean attics soak up radiant heat all day and release it into living spaces exactly when time-of-use rates hit their highest tiers. In the uninsulated or underinsulated attics common in 1950s-1970s tract homes, a radiant barrier can reduce attic temperatures by 20-35 degrees during peak hours. Radiant Barrier Installation covers our full approach.

Attic Radiant Barrier

Signs you need it

Your upstairs rooms are uncomfortably hot by 4 PM despite the AC running, or your summer PG&E bills spike in July and August even though you don’t raise the thermostat.

What it costs in Sunnyvale

Radiant barrier foil stapled to attic rafters in a typical 1,200-1,800 square foot Sunnyvale attic runs $1,400-$2,800, including air sealing of accessible penetrations first.

How we do it

We air seal the attic floor, then install perforated radiant barrier foil across rafter bays with a 3/4-inch minimum air gap, avoiding compression against roof decking that would defeat the reflective surface.

Radiant Barrier Roof Deck

Signs you need it

You’re re-roofing a Sunnyvale home with poor attic ventilation, or your existing shingles are failing prematurely from excessive attic heat.

What it costs in Sunnyvale

Radiant barrier roof deck sheathing or spray-applied coatings during re-roofing typically add $2,200-$4,500 to the roofing project, depending on pitch complexity and square footage.

How we do it

We coordinate with your roofing contractor to install radiant barrier OSB or apply a low-emissivity coating to the roof deck before new shingles go down, ensuring the radiant barrier faces the ventilated attic space.

What Radiant Barrier Installation Costs in Sunnyvale

Does radiant barrier work in Sunnyvale’s mild climate?

Yes, because the benefit isn’t about average temperature-it’s about peak attic heat reduction during PG&E’s highest time-of-use rate periods, which is exactly when Sunnyvale attics hit 140-160 degrees.

Can radiant barrier be added to existing insulation?

We install it to the roof deck or rafters, above the insulation plane, so existing attic floor insulation stays in place; we just air seal first so the barrier doesn’t trap moisture in a leaky attic.

Insulation Removal & Replacement in Sunnyvale

Insulation removal and replacement in Sunnyvale is often the only option for homes where original fiberglass has degraded beyond recovery. The marine layer moisture that compresses batts, combined with decades of rodent activity in the accessible attics of single-story ranch homes, leaves material that no longer performs and may pose health concerns. In neighborhoods like Ponderosa and Fairbrae, we regularly find 1960s-era fiberglass that’s settled to R-11 or below, contaminated with droppings, or disrupted by prior HVAC retrofits. Insulation Removal & Replacement details our safe removal process.

Contaminated Insulation Removal

Signs you need it

You’ve found rodent droppings in the attic, smelled urine when the HVAC runs, or seen insulation that’s compressed, stained, or scattered by nesting activity.

What it costs in Sunnyvale

Safe removal and disposal of contaminated attic insulation in a typical Sunnyvale ranch home runs $2,800-$5,500, including HEPA-contained extraction and sanitizing of the attic floor.

How we do it

We set up negative air containment, remove material with HEPA-filtered vacuum equipment, bag it for proper disposal, apply an enzymatic sanitizer to the attic floor, and document the clean substrate with photos before any new insulation goes in.

Insulation Replacement

Signs you need it

Your attic insulation is original to a 1960s or 1970s build, has visible settling gaps, or was damaged by a previous contractor walking through it without proper paths.

What it costs in Sunnyvale

Full replacement with new blown-in fiberglass or cellulose to current Title 24 standards, including air sealing, typically ranges $3,500-$7,200 for Sunnyvale homes of 1,200-2,000 square feet.

How we do it

We remove old material, air seal all top plates and penetrations with foam and caulk, install baffles at eaves for ventilation, then blow new material to the specified depth with depth markers visible for inspection.

What Insulation Removal & Replacement Costs in Sunnyvale

Is removed insulation hazardous waste?

Standard fiberglass and cellulose go to construction debris facilities, but rodent-contaminated material requires special handling; we dispose through licensed waste haulers and provide documentation.

How long does removal and replacement take?

Most Sunnyvale attics complete in two days-one for removal and sanitizing, one for air sealing and new installation-with the home fully habitable throughout.

Attic Air Sealing in Sunnyvale

Attic air sealing in Sunnyvale is the single most cost-effective envelope upgrade for the city’s 1950s-1970s housing stock, and it’s the mandatory first step in every job we do. These homes were built with top plates, can lights, and duct boots that leak conditioned air directly into ventilated attics, and the mild climate led builders to treat air sealing as optional. A blower-door test on a typical Sunnyvale ranch from this era reads 3,500-5,000 CFM50 before sealing; we regularly cut that by 30-50 percent with targeted attic work alone. Attic Air Sealing explains our full protocol.

Top Plate & Penetration Sealing

Signs you need it

You feel drafts from ceiling fixtures, see dusty streaks around register edges, or notice that rooms farthest from the HVAC are consistently harder to heat and cool.

What it costs in Sunnyvale

Sealing top plates, wire penetrations, and plumbing stacks in a typical Sunnyvale attic runs $1,600-$3,200, including blower-door verification of the result.

How we do it

We locate all penetrations with blower-door-guided smoke testing, seal top plates with expanding foam, caulk smaller wire and pipe penetrations, and retest to document the CFM50 reduction.

Can Light & Duct Boot Sealing

Signs you need it

You have original recessed can lights in a 1960s or 1970s ceiling, or your HVAC ducts connect to ceiling registers with visible gaps around the boot.

What it costs in Sunnyvale

Sealing accessible can lights with fire-rated covers and mastic-sealing duct boots typically adds $800-$2,400 to a Sunnyvale attic air sealing job, depending on count and accessibility.

How we do it

We install pre-formed fire-rated enclosures over each can light, seal with high-temperature caulk, then mastic-seal all duct boot connections to the ceiling drywall and flex duct to the boot.

What Attic Air Sealing Costs in Sunnyvale

Do I need to remove insulation first to air seal?

We move existing insulation aside, seal, then replace it; if the material is contaminated or too degraded to handle, we’ll note that in the written scope and price removal separately.

Will air sealing alone lower my PG&E bill?

Yes, typically 10-20 percent in Sunnyvale’s older homes, because you’re no longer paying to heat and cool your attic; the savings accelerate if we add insulation after sealing.

Wall Insulation in Sunnyvale

Wall insulation in Sunnyvale addresses a hidden defect in the city’s 1950s-1960s slab-on-grade ranch homes: many were built with literally no insulation in the perimeter walls. The original builders assumed the mild climate made it unnecessary, so opening a wall for any renovation regularly reveals drywall nailed directly to studs with an empty cavity behind it. This is especially common in the Lockheed-era tracts, and it means whole-house comfort and efficiency gains are possible even without touching the attic. Wall Insulation covers our methods and materials.

Drill & Fill Wall Insulation

Signs you need it

Your walls are cold to the touch in winter, you have no insulation in exterior walls confirmed by a remodel opening, or your home was built in Sunnyvale between 1950 and 1965.

What it costs in Sunnyvale

Drilling and filling exterior walls with dense-pack cellulose in a typical 1,200-square-foot Sunnyvale ranch runs $3,200-$6,500, including patching and matching texture.

How we do it

We drill 2-inch holes at stud-bay spacing, blow cellulose to 3.5 pounds per cubic foot density to prevent settling, then patch with matching drywall and texture, painting to blend.

Injection Foam Wall Insulation

Signs you need it

You need higher R-value in limited cavity depth, or your walls have obstructions that make dense-pack cellulose difficult to install consistently.

What it costs in Sunnyvale

Injection foam in existing walls typically runs $4,500-$8,500 for a Sunnyvale ranch home, with higher material cost offset by better air sealing and higher R-value per inch.

How we do it

We inject slow-rise open-cell foam through similar access holes, controlling expansion to fill cavities without bowing studs, then patch and finish to match existing surfaces.

What Wall Insulation Costs in Sunnyvale

Does wall insulation trigger Title 24 in Sunnyvale?

Yes, if the work is part of a permitted renovation or exceeds 1,000 square feet of wall area, Sunnyvale’s building department requires compliance documentation that we prepare as part of our scope.

Will drill and fill damage my walls?

The holes are 2 inches, strategically placed, and fully patched; in textured ceilings and walls common in Sunnyvale’s older homes, the repair is typically invisible after painting.

Attic Cleaning & Rodent Proofing in Sunnyvale

Attic cleaning and rodent proofing in Sunnyvale is a frequent starting point for homeowners who’ve heard scratching overhead or noticed a smell when the HVAC cycles. The single-story ranch homes with accessible attics and mature tree canopy in neighborhoods like Lakewood and Ortega provide ideal rodent highway access, and original construction gaps at eaves and roof-wall junctions were never sealed. Once squirrels or rats establish paths, they compress and contaminate insulation while creating entry points for moisture. Attic Cleaning & Rodent Proofing covers our full remediation approach.

Attic Sanitizing & Decontamination

Signs you need it

You smell urine or musk when the heater runs, see droppings scattered across insulation, or have found dead rodents in the attic space.

What it costs in Sunnyvale

Full attic sanitizing and decontamination with HEPA removal of affected insulation, enzymatic treatment, and replacement with new material runs $3,500-$7,800 in typical Sunnyvale ranches.

How we do it

We remove contaminated material under negative air pressure, apply commercial enzymatic sanitizer to all surfaces, fog with odor counteractant, and install new insulation only after the substrate tests clean.

Rodent Proofing & Exclusion

Signs you need it

You hear scratching regularly, find new droppings after prior cleanup, or see gnaw marks around eave vents, fascia gaps, or roof pipe penetrations.

What it costs in Sunnyvale

Rodent proofing with exclusion screening, hardware cloth, and sealant at all identified entry points typically runs $1,800-$4,200 for a Sunnyvale home, with one-year revisit included.

How we do it

We perform a full exterior inspection, seal all entry points larger than 1/4 inch with rodent-resistant materials, install vent screening, and provide a documented photo map of every location addressed.

What Attic Cleaning & Rodent Proofing Costs in Sunnyvale

Do you handle live rodents or just the damage?

We partner with licensed pest control for active infestations, then handle the structural exclusion and insulation restoration; our written scope specifies exactly which party does what.

How do I know rodents won’t come back?

Our exclusion work carries a one-year guarantee; if they breach our seals, we return and fix it at no charge, documented in your written warranty under Haven Standard.

Home Energy Audit in Sunnyvale

A home energy audit in Sunnyvale gives homeowners the documentation they need to prioritize envelope upgrades in a house that may have multiple simultaneous problems. The 1950s-1970s housing stock often presents a combination of unsealed attics, uninsulated walls, leaky ducts, and moisture issues that can overwhelm a homeowner trying to sequence repairs. Our audit provides a written report with blower-door numbers, thermal images, and a prioritized scope so you know exactly what to fix first and what each improvement will cost. Home Energy Audit explains our full diagnostic process.

Blower Door Test

Signs you need it

Your home feels drafty but you can’t locate the source, your PG&E bills are high despite moderate thermostat settings, or you’re planning major renovation and need a baseline.

What it costs in Sunnyvale

A standalone blower-door test with written report and air-leakage location mapping runs $450-$750 in Sunnyvale, credited toward any remediation work we perform.

How we do it

We install a calibrated fan in an exterior door, depressurize the house to 50 Pascals, measure CFM50, then use smoke pencils and infrared to locate and document each significant leak path.

Thermal Imaging Inspection

Signs you need it

You have persistent cold spots, suspect missing wall insulation, or need documentation for a Title 24 compliance dispute with Sunnyvale’s building department.

What it costs in Sunnyvale

Thermal imaging as part of a full audit package adds $200-$400 to the blower-door test, or $550-$950 as a standalone inspection with written report.

How we do it

We run the blower door during imaging to exaggerate temperature differentials, capture FLIR images of all exterior walls and ceiling planes, and annotate each image with the likely cause and recommended fix.

What Home Energy Audit Costs in Sunnyvale

Is an energy audit required before insulation work?

Not by Sunnyvale’s building department, but we require it for our own work because without a blower-door baseline, we can’t prove the air sealing actually worked or give you the documented result you paid for.

What does the audit report include?

You receive blower-door CFM50 before and after any work we do, thermal images with annotations, a written priority list with prices for each measure, and the documented photo record of all findings.

Brands We Service in Sunnyvale

We install Owens Corning, Johns Manville, Knauf, and GreenFiber products sourced through Bay Area distributors, with no proprietary lock-in that limits your options. Most materials are stocked locally for next-day availability on standard jobs. our brands

Pricing for Insulation in Sunnyvale, CA

Neighborhoods We Serve in Sunnyvale

Our crews work throughout Sunnyvale’s established residential areas, from the original aerospace tracts to newer infill developments. Most appointments are scheduled within 48 hours, with emergency response available for active water intrusion or exposed electrical in attics and crawl spaces.

• Birdland
• Cherry Chase
• Fairbrae
• Lakewood
• Ortega
• Ponderosa

Service Area - Cities Near Sunnyvale

We dispatch crews throughout the San Francisco Bay Area from our regional office, with Mountain View, CA and Santa Clara, CA to the south, Cupertino, CA to the west, and Los Altos, CA to the northwest all within regular service territory. Same scheduling and pricing structure apply across these cities.

FAQs About Insulation in Sunnyvale