Fast, Reliable Attic Insulation Across San Francisco
Attic insulation in San Francisco runs $1.50 to $4.20 per square foot for blown-in, and $2.80 to $6.50 per square foot for batt replacement, including removal of old material where needed. Most whole-attic projects land between $2,200 and $7,800 depending on square footage, current R-value, and whether we’re air-sealing before we insulate. If your attic has no insulation at all, which we see often in pre-1940 homes across the Richmond, Sunset, and Noe Valley, you’re losing heat straight through the roof every foggy night. Call (559) 245-9792 for a written quote before any work begins.
Alden Insulation San Francisco works on the city’s older housing stock every week. We know what a 1910 Edwardian attic looks like above the lath and plaster. We know what happens when marine air gets into wall cavities in the Outer Sunset. That local knowledge means we diagnose the real problem, not just the symptom. Our Attic Insulation team is background-checked, uniformed, and arrives inside the scheduled window.
Why Alden Insulation San Francisco Is San Francisco’s Preferred Attic Insulation Company
We’re held to The Garrison Standard, which means written prices before we start and a written 365-day guarantee after we finish. That guarantee has teeth: if the insulation fails inside that year, we return and make it right at no charge. No fine print, no phone tag. The crew that shows up at your door in Bernal Heights or the Marina is the same crew that answers questions before the job and cleans up after it.
San Francisco homeowners call us because they’ve been burned before. A contractor quotes one number, shows up late, and revises the invoice at the door. We don’t work that way. The price you approve in writing is the price on the final invoice. Every technician is background-checked. Every call to (559) 245-9792 is answered by a live person, 24/7, not a voicemail.
Bryce Holloway leads the operation here. He has built the San Francisco crew around one idea: do the job by the book, document what was installed, and stand behind it in writing. That’s the whole system. It works because it’s simple.
Attic Mold Removal in San Francisco
Attic mold removal in San Francisco is a specialized job we handle regularly, because the city’s fog and marine air create exactly the conditions mold needs: persistent dampness, trapped moisture, and organic material to feed on. When old fiberglass batts absorb moisture in a Sun”set” attic, mold follows within months, often hidden behind furniture or inside wall cavities. We remove the contaminated insulation, treat the affected framing, and address the moisture source so it doesn’t return. Expect to pay $1,800 to $5,500 for mold remediation plus insulation replacement in a typical San Francisco attic.
Moisture Source Correction
Removing mold without fixing the moisture is a waste of money. In San Francisco, the moisture usually comes from air leaks at rim joists, bath fans venting into the attic, or missing vapor barriers in walls facing the ocean. Our crew finds the source before we treat the mold, then air-seals and re-insulates so the problem stays gone.
Surface Treatment and Replacement
After the contaminated material is out, we treat the framing and any affected sheathing, then install fresh insulation rated for damp environments. Rockwool is often the right choice in the Sunset and Richmond because it resists moisture and doesn’t slump. We document every step so you know exactly what was done.
Attic Insulation Removal in San Francisco
Attic insulation removal in San Francisco is often the first step before a top-up, because many older homes here have insulation that is past its useful life. We remove old fiberglass, cellulose, or newspaper insulation, bag it, and dispose of it properly. The job usually runs $1,200 to $3,800 for a typical 1,200-square-foot attic, more if the material is water-damaged or contaminated. You need removal when insulation has slumped, absorbed moisture, or been soiled by pests.
Slumped and Water-Damaged Batts
In the Sunset and Richmond, we regularly remove fiberglass batts that have slumped to the bottom of wall and attic cavities. The upper portion of the cavity is bare, so heat escapes and cold spots form. The lower portion is compressed, which kills its R-value. In a 1920s Sunset District stucco home, our crew removed water-stained batts that had completely collapsed, air-sealed the rim joists, and installed Rockwool Comfortbatt to restore even coverage. The condensation behind a bedroom dresser disappeared within a week.
Pest-Contaminated Insulation
Rats and raccoons love San Francisco attics, especially in older Victorians with gaps at the roofline. When insulation is soiled with droppings or urine, it has to come out. We remove it, sanitize the area, and install fresh material. You don’t want to blow new insulation over a rodent problem.
Trusted Brands We Service in San Francisco
We install and remove insulation using products from eight industry-respected brands, including CertainTeed, Icynene, and GreenFiber. You can research any of these names before you commit, and we encourage you to. We stock common materials locally for fast turnaround across San Francisco, which means a job in the Outer Richmond or Glen Park doesn’t wait on a shipment from out of state. The brand matters less than the installation, but we only work with materials we’d put in our own attics.
Common Attic Insulation Problems We See in San Francisco Homes
- Zero insulation in original 1900s attics. Bare lath-and-plaster ceilings let heat escape straight through the roof. On a foggy August night in the Avenues, that means a cold house and a heating bill that never stops climbing.
- Slumped batts in the Sunset and Richmond. Decades-old fiberglass absorbs marine moisture and settles to the bottom of wall cavities. Cold spots form, condensation follows, and mold grows behind furniture where nobody looks.
- Missing attic fire-blocking in converted Victorians. When single-family homes become multi-unit rentals, the attic often lacks proper compartmentalization. Old newspaper or sawdust insulation can be a hidden fire hazard.
- Bath fans venting into the attic. Many older San Francisco homes have bathroom exhaust fans that dump moist air directly into the attic space. That’s a mold factory. We re-vent them correctly before insulating.
Pricing for Attic Insulation in San Francisco, CA
Here are honest numbers for the San Francisco market, based on what we see across the city:
- Blown-in attic insulation: $1.50 – $4.20 per square foot
- Attic batt insulation (replacement): $2.80 – $6.50 per square foot
- Attic insulation top-up: $1,200 – $3,200 for a typical attic
- Attic insulation removal: $1,200 – $3,800
- Attic mold removal (with insulation replacement): $1,800 – $5,500
- Attic baffles and ventilation prep: $450 – $1,400
Your price depends on square footage, current R-value, access difficulty, and whether we’re removing old material first. The quote we give you is the price you pay. Call (559) 245-9792 for a written estimate.
We Also Serve Cities Near San Francisco
Alden Insulation San Francisco also handles attic insulation work in Daly City, South San Francisco, Alameda, and Berkeley. If you’re just outside the city limits, we can usually reach you the same week. The same written pricing and 365-day guarantee apply everywhere we work. See our full San Francisco coverage area for details.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco 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 Attic Insulation in San Francisco
No. San Francisco’s mild temperatures reduce heating and cooling loads, but they don’t eliminate the need for attic insulation. The city’s fog and marine air create persistent dampness, and uninsulated attics allow heat to escape on cool nights while letting moisture condense inside wall and attic cavities. Insulation here is as much about moisture control and mold prevention as it is about temperature. Call (559) 245-9792 for an assessment of your specific attic.
Because those neighborhoods sit directly in the fog belt, where marine air carries moisture that fiberglass batts absorb over time. The batts get heavy, slump to the bottom of the wall cavity, and leave the upper portion uninsulated. The compressed, damp material then creates cold spots that trigger condensation. This failure pattern is rare in drier East Bay cities but common in the Outer Sunset and Outer Richmond.
Look for cold spots on upper floor ceilings, mold or mildew smell, visible water stains on plaster, or insulation that has visibly settled or compressed. In homes built before 1940, the attic often has no insulation at all, just bare lath and plaster. If you’re unsure, call us at (559) 245-9792 and we’ll inspect it. The inspection is part of the free estimate.
Yes. We access the attic from above through the existing hatch or a gable vent, remove the old insulation with a commercial vacuum, and never touch the plaster ceiling below. The lath and plaster stays intact. We work around the existing structure, and we protect the living space with drop cloths and containment barriers during removal.
Yes, in most cases. If mold is present in the insulation itself, removal is the only way to eliminate it. Treating the surface without removing contaminated material leaves active spores that will regrow in San Francisco’s damp climate. We remove the affected insulation, treat the framing, fix the moisture source, and install new material rated for humid conditions. Call (559) 245-9792 for a mold assessment and written quote.
Written by Bryce Holloway, Owner at Alden Insulation San Francisco, serving San Francisco attic insulation needs with written prices and written guarantees.