Insulation in Sunnyvale, CA
Crawl space encapsulation and vapor barrier installation in Sunnyvale typically runs $3,500-$7,500 for a full encapsulation with dehumidification, while vapor barrier-only jobs start around $1,200-$2,800. Most Sunnyvale crawl spaces we see are vented dirt floors beneath 1950s-1970s ranch homes, where summer ground moisture and winter condensation create the exact conditions that degrade floor joists and drive indoor humidity spikes. Call (650) 381-1512 for a written price before any work starts.
Why Sunnyvale Homes Are Different
Sunnyvale was built out almost entirely between the 1950s and late 1970s - before California’s Title 24 energy code took effect in 1978 - meaning the dominant housing stock carries little to no original wall insulation and severely degraded or settled attic fill. This pre-code inventory, paired with Sunnyvale’s current ADU construction surge, makes Sunnyvale a market where insulation contractors are simultaneously retrofitting bare-bones originals and building compliant new shells.
The typical single-family home is a 1,100-1,600 sq ft post-war ranch built between 1952 and 1975, constructed with minimal cavity insulation and open soffit eaves that allow significant attic air bypass. In Lakewood, Morse-Mathilda, and Murphy-Ellis neighborhoods, garage-conversion ADUs routinely present as uninsulated concrete slabs, single-layer stucco walls with empty stud cavities, and no attic separation from the main structure. Sunnyvale’s inland South Bay climate - summer afternoons at 88-96°F, winter nights in the low 40s - means under-insulated attics drive excessive AC loads and meaningful heat loss, unlike the fog-buffered coast.
Our Main Sunnyvale Services
Most Sunnyvale homeowners who call us start with attic work or spray foam for ADU compliance, though blown-in remains the workhorse for retrofitting settled original fill.
Attic Insulation in Sunnyvale
Attic insulation in Sunnyvale usually means adding R-38 to R-49 blown-in fiberglass or cellulose over degraded original batts that have compressed to R-11 or lower. We air seal first - top plates, can lights, penetrations - then blow, and we publish before-and-after blower-door numbers so you can verify the envelope tightened. Attic Insulation in Sunnyvale covers full-scope jobs, partial fills, and ADU attic separations.
Spray Foam Insulation in Sunnyvale
Spray foam in Sunnyvale is increasingly called for on ADU garage conversions where empty 2×4 stud cavities and unsealed slab-to-wall joints must meet Title 24 minimums. We use open-cell and closed-cell products from Demilec and Icynene, applied after air sealing is complete. Spray Foam Insulation in Sunnyvale details wall cavity fills, roof deck applications, and hybrid systems.
Blown-In Insulation in Sunnyvale
Blown-in insulation in Sunnyvale is the standard retrofit for post-war ranch attics with settled fiberglass or original rock wool. We source Owens Corning and GreenFiber products, installed only after blower-door-guided air sealing of the attic floor. Blown-In Insulation in Sunnyvale covers cellulose and fiberglass options with documented depth and coverage verification.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterCrawl Space Encapsulation & Vapor Barrier in Sunnyvale
Crawl space encapsulation and vapor barrier installation in Sunnyvale addresses a specific regional problem: vented dirt-floor crawl spaces beneath 1950s-1970s ranches that pull ground moisture year-round and spike indoor humidity during summer inland heat. Crawl Space Encapsulation & Vapor Barrier is our full-scope service for these conditions. In Murphy-Ellis and Morse-Mathilda neighborhoods, we regularly find joist bays black with mold and insulation batts sagging into standing water - the result of decades of uncontrolled vapor drive through bare soil.
Crawl Space Vapor Barrier
Signs you need it
Your crawl space has bare dirt or a thin, torn polyethylene sheet with standing water or white efflorescence on the foundation walls.
What it costs in Sunnyvale
A 6-mil to 20-mil vapor barrier installed over cleaned ground in a typical 1,200 sq ft Sunnyvale crawl space runs $1,200-$2,800.
How we do it
We remove debris and old plastic, seam-seal a new reinforced polyethylene sheet to the walls and piers, and tape all penetrations before delivering a photo record of the sealed membrane.
Crawl Space Encapsulation
Signs you need it
You smell musty air indoors, your hardwood floors cup seasonally, or your HVAC ducts in the crawl space show corrosion or mold growth.
What it costs in Sunnyvale
Full encapsulation with closed-cell spray foam on walls, sealed vapor barrier, and dehumidification for a standard Sunnyvale ranch crawl space ranges $3,500-$7,500.
How we do it
We seal all vents, apply closed-cell foam to foundation walls and rim joists, install a reinforced floor membrane, and add a condensate-pumped dehumidifier with a written scope and warranty delivered before work begins.
What Crawl Space Encapsulation & Vapor Barrier Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Vapor barrier (ground only) | $1,200 - $2,800 |
| Full encapsulation with dehumidifier | $3,500 - $7,500 |
| Closed-cell foam on crawl walls (add-on) | $2,000 - $4,500 |
How long does crawl space encapsulation take in Sunnyvale?
Most vapor barrier jobs finish in one day; full encapsulation with foam and dehumidification takes two to three days, depending on access and soil conditions. Call (650) 381-1512 for a written price and timeline.
Will encapsulation fix my musty smell?
Yes, when the source is crawl space moisture - sealing the vapor drive and controlling humidity eliminates the conditions that produce musty air migrating through floor penetrations. We verify with before-and-after humidity readings in our photo record.
Radiant Barrier Installation in Sunnyvale
Radiant barrier installation in Sunnyvale delivers measurable payback that foggier coastal markets cannot match, because Sunnyvale’s inland position subjects roofs to direct solar gain through summer afternoons regularly reaching 88-96°F. Radiant Barrier Installation addresses the specific thermal load that makes post-war ranch attics in Sunnyvale’s Lakewood and Morse-Mathilda neighborhoods cook by 2 p.m. We install radiant barriers only after air sealing is complete - never over an unsealed attic floor - and we document the envelope improvement with blower-door numbers.
Attic Radiant Barrier
Signs you need it
Your attic exceeds 130°F on summer afternoons, your AC runs continuously after 2 p.m., or your second-story rooms stay uncomfortably warm despite adequate insulation depth.
What it costs in Sunnyvale
Radiant barrier foil stapled to attic rafters or laid over existing insulation in a typical 1,400 sq ft Sunnyvale attic runs $1,100-$2,400.
How we do it
We complete attic floor air sealing first, then install perforated radiant barrier foil with proper drape for ventilation clearance and document coverage with photos.
Radiant Barrier & Ventilation
Signs you need it
Your attic has blocked soffit vents, no ridge vent, or bathroom fans dumping into the space, trapping heat even with adequate insulation.
What it costs in Sunnyvale
Radiant barrier combined with soffit baffle installation and passive vent correction in Sunnyvale ranges $1,800-$3,500.
How we do it
We install baffles to preserve soffit-to-ridge airflow, apply radiant barrier, and verify with a smoke pencil that ventilation paths are unobstructed.
What Radiant Barrier Installation Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Attic radiant barrier (foil only) | $1,100 - $2,400 |
| Radiant barrier with ventilation correction | $1,800 - $3,500 |
| Radiant barrier roof deck (new construction/ADU) | $2,500 - $4,200 |
Does radiant barrier work with blown-in insulation?
Yes - we lay foil over completed blown-in fills or staple to rafters above it, provided attic floor air sealing is done first so dust cannot settle on the reflective surface. Call (650) 381-1512 for a written scope.
How much will my attic temperature drop?
Attic air temperature typically falls 20-35°F with proper radiant barrier and ventilation, though indoor comfort improvement depends on your duct location and existing insulation depth - we measure both during our initial inspection.
Insulation Removal & Replacement in Sunnyvale
Insulation removal and replacement in Sunnyvale is common in homes built 1952-1975 where original fiberglass or rock wool has settled, been disturbed by rodents, or contaminated by roof leaks. Insulation Removal & Replacement is particularly necessary in Sunnyvale’s older neighborhoods where decades of unsealed attic bypasses have pulled dusty, humid air through the insulation matrix, degrading both R-value and indoor air quality. We never install new material over old without documenting what was removed and why.
Contaminated Insulation Removal
Signs you need it
Your attic insulation shows dark streaking, rodent droppings, urine staining, or a compressed, crusted texture that crumbles when touched.
What it costs in Sunnyvale
Removal and disposal of contaminated insulation from a typical 1,200 sq ft Sunnyvale attic runs $1,500-$3,200, before replacement.
How we do it
We erect containment, use HEPA-filtered extraction, bag on-site, and deliver a photo record of the cleaned deck before any new material is specified.
Insulation Replacement
Signs you need it
Your attic has bare spots, settled fill below joist tops, or R-value well below current Title 24 minimums for Sunnyvale’s climate zone.
What it costs in Sunnyvale
Replacement with new blown-in fiberglass or cellulose to R-38 in a standard Sunnyvale ranch attic ranges $1,800-$3,800 after removal.
How we do it
We air seal the attic floor with blower-door guidance, then blow to specified depth with depth markers and a final photo record of coverage uniformity.
What Insulation Removal & Replacement Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Contaminated insulation removal only | $1,500 - $3,200 |
| Removal + replacement to R-38 | $3,300 - $7,000 |
| Vermiculite removal (with lab testing) | $4,000 - $8,500 |
Can you remove insulation with asbestos?
We do not handle asbestos-containing materials; if vermiculite or pre-1990 batt insulation is suspected, we coordinate third-party abatement before our crew enters. Call (650) 381-1512 for testing guidance and a written plan.
How long does removal and replacement take?
Most Sunnyvale attic removals finish in one day, replacement in a second day, with the home sealed and habitable each evening - we do not leave open cavities overnight.
Attic Air Sealing in Sunnyvale
Attic air sealing in Sunnyvale is the foundational step we never skip - the single most cost-effective envelope improvement for post-war ranches with open soffit eaves and unsealed top plates. Attic Air Sealing addresses the bypass paths that make insulation perform poorly regardless of depth; in Sunnyvale’s climate, a leaky attic floor means you’re conditioning your roof cavity all summer and pulling cold attic air into heated space all winter. We publish before-and-after blower-door numbers on every job so you can see the exact CFM50 reduction.
Top Plate & Penetration Sealing
Signs you need it
Your blower-door test shows excessive leakage at the attic floor, or you feel drafts at exterior wall outlets and baseboards during winter.
What it costs in Sunnyvale
Sealing top plates, wire penetrations, and plumbing stacks in a typical Sunnyvale ranch attic runs $800-$1,800.
How we do it
We map leaks with a blower door and infrared camera, seal with fire-rated caulk and foam, and retest to document the CFM50 reduction in your written record.
Can Light & Duct Boot Sealing
Signs you need it
You see dusty halos around ceiling can lights, or your HVAC ducts show temperature loss at attic connections.
What it costs in Sunnyvale
Sealing can light housings with approved covers and mastic-sealing duct boots in Sunnyvale ranges $600-$1,400 for a typical home.
How we do it
We install fire-rated covers over non-IC cans, seal with high-temperature caulk, and apply mastic - not tape - to all duct connections before insulation goes back.
What Attic Air Sealing Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Top plate and penetration sealing | $800 - $1,800 |
| Can light and duct boot sealing | $600 - $1,400 |
| Full attic floor air sealing (comprehensive) | $1,500 - $3,200 |
Do I need to remove insulation to air seal?
Yes - we temporarily move existing insulation to expose the attic floor, seal all bypasses, then replace or upgrade insulation; the written scope specifies whether removal is included. Call (650) 381-1512 for a written price.
What blower-door number should I expect after sealing?
A typical pre-1975 Sunnyvale ranch starts at 3,500-5,500 CFM50 and commonly reaches 2,000-3,500 CFM50 after comprehensive attic air sealing - we deliver both numbers in your documented record.
Wall Insulation in Sunnyvale
Wall insulation in Sunnyvale means filling empty cavities in homes built before 1978, when Title 24 did not yet require minimum R-values in framed walls. Wall Insulation is increasingly called for in ADU garage conversions in Lakewood and Murphy-Ellis, where permit inspectors now check that 2×4 stud bays behind original stucco meet current standards. We use injection foam and dense-pack cellulose for retrofits, spray foam for open-cavity ADU work - always with a written price and scope before any material is ordered.
Injection Foam Wall Insulation
Signs you need it
Your exterior walls feel cold to the touch in winter, or an infrared scan shows empty cavities behind finished drywall in a pre-1978 home.
What it costs in Sunnyvale
Injection foam into existing 2×4 walls of a 1,400 sq ft Sunnyvale ranch runs $3,500-$6,500, with minimal interior disruption.
How we do it
We drill 5/8-inch holes through exterior stucco or interior drywall, inject slow-rise foam to fill the cavity, patch, and texture-match the access points.
Drill & Fill Wall Insulation
Signs you need it
Your walls have no insulation, you can hear outdoor noise clearly, or you’re converting a garage to living space under current Title 24 requirements.
What it costs in Sunnyvale
Dense-pack cellulose drill-and-fill for a standard Sunnyvale ADU conversion ranges $2,800-$5,200 depending on cavity condition and access.
How we do it
We drill at stud-bay intervals, dense-pack cellulose to 3.5 pounds per cubic foot for no settling, seal holes, and deliver a photo record of fill density.
What Wall Insulation Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Injection foam (existing 2×4 walls) | $3,500 - $6,500 |
| Drill & fill cellulose (ADU/garage conversion) | $2,800 - $5,200 |
| Open-cavity spray foam (new construction/ADU) | $4,000 - $7,500 |
Can you insulate walls without removing drywall?
Yes - injection foam and dense-pack cellulose both fill cavities through small drilled holes that we patch and texture-match; drywall stays in place. Call (650) 381-1512 for a written scope and price.
Will wall insulation help with sound?
Dense-pack cellulose and closed-cell foam both reduce exterior noise transmission significantly, though dedicated soundproofing with Rockwool is specified separately when STC ratings are required.
Attic Cleaning & Rodent Proofing in Sunnyvale
Attic cleaning and rodent proofing in Sunnyvale addresses a common consequence of the area’s mature tree canopy and unsealed attic bypasses: roof rat and mouse activity in attics with decades-old insulation. Attic Cleaning & Rodent Proofing is often the first service we perform in Morse-Mathilda and older Lakewood homes before any insulation work can begin. We remove contaminated material, sanitize, exclude entry points, and document the sealed envelope with photos - only then do we specify replacement insulation.
Attic Sanitizing & Decontamination
Signs you need it
Your attic smells of ammonia, shows rodent droppings concentrated near HVAC penetrations, or insulation has been tunneled through and compressed.
What it costs in Sunnyvale
HEPA vacuuming, enzyme treatment, and sanitizing of a typical 1,200 sq ft Sunnyvale attic runs $1,200-$2,600.
How we do it
We remove soiled insulation, apply EPA-registered disinfectant with fogging equipment, and deliver a photo record of the sanitized deck before exclusion work.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching at night, find droppings in the attic, or see gnaw marks on soffit vents and roof junctions.
What it costs in Sunnyvale
Comprehensive rodent exclusion with metal flashing, hardware cloth, and sealant for a standard Sunnyvale ranch ranges $900-$2,200.
How we do it
We inspect roofline, vents, and utility penetrations with the attic, install metal barriers at all entry points, and guarantee the exclusion with our 365-Day Done Right Promise.
What Attic Cleaning & Rodent Proofing Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Attic sanitizing and decontamination | $1,200 - $2,600 |
| Rodent proofing and exclusion | $900 - $2,200 |
| Full attic restoration (cleaning + exclusion + insulation) | $3,500 - $7,500 |
Do you handle live rodents or just exclusion?
We do not trap or remove live animals; we coordinate with wildlife control if active infestation is present, then perform permanent exclusion and restoration. Call (650) 381-1512 for sequencing guidance.
How do I know if rodents have returned?
We install monitoring blocks at suspected entry paths and teach you the signs; our exclusion work is backed by the 365-Day Done Right Promise, and we return at no charge if new entry occurs through our sealed points.
Home Energy Audit in Sunnyvale
A home energy audit in Sunnyvale pinpoints exactly where a pre-1978 envelope is leaking and which upgrades deliver measurable return - critical information when you’re deciding between attic insulation, wall fill, or full crawl space encapsulation. Home Energy Audit is the starting point for every comprehensive job we do in Sunnyvale, because without a blower-door baseline, you’re guessing at priorities. We deliver a written report with prioritized recommendations, estimated ranges, and the documentation you’ll need for SMUD or PG&E rebate applications.
Blower Door Test
Signs you need it
Your energy bills spike seasonally, rooms have uneven temperatures, or you’re planning insulation work and want proof of improvement.
What it costs in Sunnyvale
A standalone blower-door test with thermal imaging in Sunnyvale runs $350-$600; it’s credited toward any work we perform.
How we do it
We depressurize the house to 50 Pascals, measure CFM50 leakage, and use infrared cameras to map exactly where air is entering or escaping the envelope.
Thermal Imaging Inspection
Signs you need it
You suspect missing wall insulation, want to verify insulation coverage after installation, or need documentation for an energy-efficiency rebate.
What it costs in Sunnyvale
Thermal imaging bundled with a blower-door test adds $150-$300; standalone thermal inspection ranges $250-$450.
How we do it
We scan interior and exterior surfaces during controlled conditions, annotate images with temperature differentials, and include findings in your written report with photo documentation.
What Home Energy Audit Costs in Sunnyvale
| Item | Typical range in Sunnyvale |
|---|---|
| Blower-door test with thermal imaging | $350 - $600 |
| Full home energy audit (comprehensive) | $450 - $850 |
| Duct leakage test (add-on) | $200 - $350 |
Will an audit tell me which insulation to prioritize?
Yes - the blower-door test and thermal images show whether attic bypasses, wall cavities, or duct leakage dominate your load, so you spend on what moves the number. Call (650) 381-1512 to schedule.
Can I use your audit for rebates?
Our reports include the documentation format PG&E and SMUD require for insulation and air-sealing rebates; we note eligible measures and estimated savings in the written scope.
Brands We Service in Sunnyvale
We stock and install materials from Owens Corning, Johns Manville, Knauf, Rockwool, Icynene, Demilec, and GreenFiber - no proprietary lock-in means we specify what’s right for your assembly, not our inventory. Most common batts and blown-in products are available next-day through our San Francisco Bay Area supply chain. See our brands for full specifications.
Pricing for Insulation in Sunnyvale, CA
| Service | Typical range in Sunnyvale |
|---|---|
| Crawl space vapor barrier | $1,200 - $2,800 |
| Full crawl space encapsulation | $3,500 - $7,500 |
| Attic radiant barrier | $1,100 - $2,400 |
| Radiant barrier with ventilation correction | $1,800 - $3,500 |
| Insulation removal (contaminated) | $1,500 - $3,200 |
| Removal + replacement to R-38 | $3,300 - $7,000 |
| Attic air sealing (comprehensive) | $1,500 - $3,200 |
| Injection foam wall insulation | $3,500 - $6,500 |
| Drill & fill wall insulation | $2,800 - $5,200 |
| Attic sanitizing and decontamination | $1,200 - $2,600 |
| Rodent proofing and exclusion | $900 - $2,200 |
| Home energy audit (full) | $450 - $850 |
Prices in Sunnyvale push higher when crawl spaces have limited access, attics contain vermiculite requiring lab testing, or ADU conversions need permit-compliant documentation for Santa Clara County inspectors. Every job still begins with a written price - no work starts without it - under Haven Standard Clause 1.
Neighborhoods We Serve in Sunnyvale
Our crews work throughout Sunnyvale with same-day response for urgent conditions like water intrusion or active rodent entry. Dispatch and scheduling are coordinated from our San Francisco Bay Area office; technicians arrive uniformed and background-checked with a text when they’re on the way.
- Lakewood
- Morse-Mathilda
- Murphy-Ellis
- Sunnyvale West
- Ponderosa
Service Area - Cities Near Sunnyvale
We serve the full South Bay corridor from our regional office, with regular work in Mountain View, CA to the north, Santa Clara, CA to the east, Los Altos, CA to the west, and Milpitas, CA to the northeast. Each city page documents the local housing stock and pricing specific to that market.
Serving Sunnyvale, CA - Our Local Coverage Area
We’re based in the Sunnyvale area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Insulation in Sunnyvale
Attic insulation retrofit typically does not require a permit in Sunnyvale, but ADU garage conversions, wall insulation changes, and crawl space encapsulation with dehumidification do - we pull permits when required and schedule inspections as part of our written scope.
We answer calls with a live person 24/7 and typically schedule inspections within 48 hours; emergency water intrusion or rodent entry gets same-day assessment when conditions warrant.
Most Sunnyvale HOAs do not regulate interior attic or crawl space work, but exterior wall insulation with visible patchwork or roof-deck radiant barrier may require architectural review - we document our scope to support your application if needed.
Call (650) 381-1512 for a free estimate with a written price before any work starts. Every job includes a Documented Photo Record, and applicable work comes with before-and-after blower-door numbers so you can verify what you paid for.
What happens when you call
- 1A real person answersNo phone trees - talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically within 60-minute.
- 4You approve before work beginsNothing starts until you say go.
What Sunnyvale Customers Say
"They air-sealed the attic floor before insulating and showed me the blower-door number before and after. The upstairs is finally the same temperature as downstairs."
- Marisol D."Two other companies quoted to blow more insulation on top of what was there. These were the only ones who said the existing material had to come out first, and explained why."
- Clifford E."They photographed rodent damage in the old insulation that we had no idea about, and priced the exclusion work separately so we could decide."
- Harriet N.