Trusted Attic Insulation for San Francisco Homeowners
Attic insulation in San Francisco typically costs $1,800 – $4,200 for a standard single-family home, depending on square footage and the current R-value of what’s already up there. Most jobs are completed in one day. Alden Insulation San Francisco has been installing and removing attic insulation under The Garrison Standard since 2002, with background-checked crews that show up inside the window we promised. If your upstairs rooms run hot in July, cold in January, or your heating bill climbed this year, the attic is usually where the answer sits. Call (559) 245-9792 and a live person answers, 24/7.
We’re part of the Garrison Partners family, and Bryce Holloway runs this location. That means every job gets a written price before work starts and a written guarantee that covers it for 365 days. No exceptions, no fine print. That’s The Garrison Standard, and it’s how we’ve operated in San Francisco since day one.
Insulation Contractors
Insulation Contractors handle the measuring, material selection, and installation of thermal barriers in attics, walls, and crawl spaces. You need one when your home’s temperature swings between floors, when energy bills creep upward without explanation, or when an inspection flags R-value below San Francisco building code. Alden Insulation San Francisco sends background-checked, uniformed technicians for every job, and the written price is in your hand before any equipment comes off the truck. Pricing runs the same range as a standard attic job, $1,800 – $4,200, with most landings between $2,200 and $3,100.
What We Check First
Before quoting anything, we measure current insulation depth and identify what material is already installed. We check for gaps around recessed lights, plumbing vents, and the attic hatch, because those small openings undo a surprising amount of insulation work. Our crews also test for air leakage around the rim joist where accessible.
Written Price, No Door Revisions
The number we quote is the number on the invoice. If unforeseen conditions appear mid-job, we stop and get your written approval before doing anything beyond scope. That discipline is the reason homeowners in San Francisco choose us over the low-bid contractors who revise the price at the door.
Attic Ventilation
Attic Ventilation is the system of intake and exhaust vents that keeps air moving through your attic so moisture doesn’t condense and heat doesn’t build to 140 degrees in August. You need it addressed when you see rust on exposed nails, smell mustiness from above, or find that snow melts unevenly on your roof line in the rare East Bay frost. Alden Insulation San Francisco evaluates attic baffles and ventilation prep as part of every attic insulation job, because insulation without airflow causes more problems than it solves. Expect ventilation work to add $400 – $900 to a typical project, depending on whether we’re adding ridge vents, soffit vents, or balancing what already exists.
Moisture Is the Real Enemy
San Francisco’s marine layer pushes damp air into attics almost every night of the year. Without proper airflow, that moisture condenses on sheathing and insulation, which degrades R-value and invites mold. We check the ratio of intake to exhaust venting, because an unbalanced system pulls air from the wrong places.
Ventilation Before Insulation, Always
The order matters. Adding R-38 blown-in insulation to an attic with blocked soffit vents creates a warm, wet box. We correct airflow first, then insulate, so the job actually performs. Our written guarantee covers the ventilation work we install for the same 365 days.
Radiant Barrier
Radiant Barrier is a reflective material, usually aluminum foil laminated to kraft paper or oriented strand board, installed under the roof deck to reflect radiant heat away from the attic floor. You need it when your attic gets brutally hot despite adequate fiberglass or cellulose, which insulates against conduction but does nothing against radiant heat. Alden Insulation San Francisco installs radiant barrier as a complement to blown-in insulation, and pricing for a typical San Francisco attic runs $1,200 – $2,800 installed, depending on attic configuration and whether we’re stapling to rafters or laying over existing insulation.
When It Pays for Itself
Radiant barrier performs best in attics with direct sun exposure and minimal shade. Homes in the Sunset and Richmond districts with flat or low-slope roofs see less benefit than a gabled Noe Valley or Bernal Heights roof that bakes all afternoon. We’ll tell you straight if your house is a poor candidate, because the written price only matters if the product works.
Installation Methods That Last
We install radiant barrier with proper air gaps, because foil without a gap conducts heat instead of reflecting it. Our crews use the staple-up method on rafters for most San Francisco homes and verify the reflective surface stays dust-free long enough to do its job. The work carries our 365-Day Done Right Promise in writing.
Attic Cleaning Services
Attic Cleaning Services remove the accumulated dust, rodent droppings, old insulation debris, and construction remnants that make attics unhealthy and make future insulation work dangerous. You need it when you see droppings, smell urine, notice dust blowing from ceiling fixtures, or before any re-insulation project so the new material isn’t laid over filth. Alden Insulation San Francisco provides attic cleaning as a standalone service or as the first phase of attic insulation replacement. Standalone cleaning in San Francisco runs $900 – $2,200 depending on attic size, access difficulty, and contamination level.
What Gets Removed
We remove loose debris, degraded insulation, rodent nesting material, and old boxes or construction trash. Then we sanitize the decking and joists and apply a deodorizer where needed. The goal is a clean substrate, not just a tidy-looking surface.
Before New Insulation Goes In
Installing fresh blown-in fiberglass over rodent droppings doesn’t fix the problem and it doesn’t pass our standard. Cleaning comes first, always. Our crews wear respirators and full PPE, and we dispose of everything according to local requirements, not by tossing it in your green bin.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Attic Mold Removal
Attic Mold Removal eliminates fungal growth from roof sheathing, rafters, and insulation caused by trapped moisture and poor ventilation. You need it when you see dark staining on the underside of the roof deck, smell persistent mustiness, or a home inspection flags mold before a sale. Alden Insulation San Francisco addresses mold at the source: we remove affected insulation, treat the sheathing and framing, correct the ventilation that caused the moisture, and re-insulate clean. Typical mold remediation in a San Francisco attic runs $1,800 – $4,500, with the wide range driven by square footage of affected sheathing and whether structural drying is needed.
The Moisture Source Comes First
Killing mold without fixing the moisture source means it comes back, usually within one season. Our process starts with identifying where the water comes from: bathroom exhaust fans venting into the attic, blocked soffit vents, roof leaks, or negative air pressure. We don’t treat the symptom and walk away.
What We Treat and How
We use EPA-registered antimicrobial treatments on affected wood surfaces after physically removing visible growth. For insulated attics, we remove and dispose of contaminated insulation, because cleaning fiberglass or cellulose in place is not reliable. The new insulation we install afterward carries our 365-Day Done Right Promise, and so does the mold treatment.
Attic Insulation Removal
Attic Insulation Removal is the process of vacuuming out old, contaminated, or underperforming insulation so the attic can be cleaned, repaired, or re-insulated from scratch. You need it when insulation is compacted by age, soaked by a roof leak, infested by rodents, or tested positive for asbestos-containing vermiculite. Alden Insulation San Francisco runs commercial-grade vacuum systems with HEPA filtration, and our crews are trained to handle disposal according to state and local requirements. Removal alone in San Francisco runs $1,100 – $2,800, depending on depth, material, and attic accessibility.
When Removal Beats Blowing Over
Blowing new insulation over old, compacted material doesn’t restore the R-value you’re paying for. If the existing layer has settled below half its original depth, or if it’s wet from a leak that’s since been repaired, removal is the honest call. We tell clients the truth even when a cheaper over-blow would be fine, because the written guarantee means we stand behind the result for a year.
Vermiculite and Older Homes
Many San Francisco homes built before 1990 contain vermiculite insulation that may have come from Libby, Montana. We do not disturb vermiculite unless it’s been tested, and we can coordinate testing before any removal work begins. If testing comes back positive, we follow the required abatement protocols rather than vacuuming it up with standard equipment.
Brands We Service
We install CertainTeed blown-in fiberglass and attic batt insulation systems, which we’ve used in hundreds of San Francisco attics where consistent coverage and predictable R-value matter. CertainTeed machines run a specific density that our crews calibrate on site, and we know the installation specs well enough to hit target R-values on the first pass rather than adding a thin top layer to hide short coverage.
We also work with GreenFiber cellulose, which performs well in older San Francisco homes with irregular joist spacing and lots of obstructions. Cellulose packs into odd cavities with fewer gaps than batts, and GreenFiber’s borate treatment adds a layer of fire and pest resistance. For homeowners who want closed-cell or open-cell spray foam, we install Demilec products. Whether your attic ends up with CertainTeed, GreenFiber, Demilec, or any other material we carry, the written price and the 365-Day guarantee stay identical.
Signs You Need a Pro Right Now
- Upstairs rooms won’t hold temperature. When the second floor runs 10 degrees warmer than downstairs in summer, your attic insulation has likely settled or was under-installed. This is the most common complaint we hear from San Francisco homeowners in Glen Park, the Mission, and Potrero Hill, where top-floor bedrooms bake by 2 p.m.
- Energy bills spiked without a rate change explanation. PG&E rate increases are real, but a 20% year-over-year jump with the same household usage usually points to heat loss through the attic. A thermal scan or a simple depth measurement tells us whether insulation is the culprit.
- You can see the joists. If the insulation in your attic is level with or below the top of the ceiling joists, you’re under-insulated by San Francisco code. Most homes need 12 to 15 inches of blown-in material to hit R-38 to R-49.
- Ice dams form on the roof edge. Rare in the city proper but common in Twin Peaks, Forest Hill, and Miraloma Park during cold snaps. Ice dams happen when heat escapes through the attic and melts roof snow unevenly. The fix is insulation and ventilation, not a bigger roof rake.
- Musty smell or visible staining under the roof deck. This means moisture is trapped in the attic, which degrades insulation performance and eventually rots sheathing. The longer it sits, the more expensive the repair becomes.
Our Process, Step by Step
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Measurement and inspection. We measure attic square footage, current insulation depth, and identify the existing material. We check soffit vent airflow, bathroom fan terminations, and the attic hatch seal. All of this is documented before pricing is discussed.
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Written quote, no obligation. You get a written price that breaks down materials, labor, removal if needed, and any ventilation work. That number doesn’t change unless you approve a written change order. No revisions at the door, no surprise line items.
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Prep and protection. Crews lay floor protection from the entry door to the attic access. We set up HEPA-filtered vacuum equipment if removal is part of the job, and we cover belongings in the attic that can’t be moved. Our technicians are background-checked and uniformed, so you know who’s in your home.
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Installation to spec. We install to the manufacturer’s published density and coverage specs, verified with depth markers and, on larger jobs, thermal imaging to confirm even coverage. Ventilation corrections happen before insulation goes in, not after.
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Walkthrough and written guarantee. We show you what we did, confirm the final R-value achieved, and hand you a written 365-Day Done Right Promise. If anything fails within that year, we return at no charge and make it right. Free second visit, in writing.
How Much Does Attic Insulation Cost in San Francisco?
A typical attic insulation project in San Francisco runs $1,800 – $4,200 for a single-family home, with most falling between $2,200 and $3,100. That range covers R-38 to R-49 blown-in fiberglass or cellulose, installed in one day, including air sealing around recessed lights and the attic hatch, or an attic insulation top-up where appropriate. Removal of existing insulation adds $1,100 – $2,800. Attic cleaning runs $900 – $2,200. Mold remediation runs $1,800 – $4,500. Radiant barrier runs $1,200 – $2,800.
What moves the price: attic square footage, ceiling height and access difficulty, whether old insulation must be removed, whether vermiculite testing is required, and whether ventilation corrections like new soffit vents are needed. What does not move the price: anything we didn’t put in writing before the work started.
The way to avoid overpaying is simple. Get a written quote that specifies the R-value you’re paying for, the material brand, and the square footage covered. Vague quotes that say “insulate attic” without depth specs are how low-bid contractors under-deliver. Every Alden Insulation San Francisco quote names the material, the target R-value, and the square footage, so you can compare apples to apples. A free estimate includes the measurement, the inspection, and the written number.
Blown-in insulation and insulation removal are two of the services we provide most often in this city, and both are quoted the same way: written, specific, and guaranteed. Call (559) 245-9792 and we’ll send a background-checked technician to measure your attic, explain your options in plain English, and hand you a written price. No obligation.
Our Service Area Near San Francisco
Alden Insulation San Francisco serves the city proper and the surrounding Bay Area, including Oakland, Berkeley, Alameda, San Mateo, Daly City, South San Francisco, San Rafael, Pacifica, Pleasant Hill, Fairfax, and Danville. Most inspections can be scheduled within 2 to 4 business days, and we answer the phone 24/7, not with a voicemail, with a live person. Browse our Attic Insulation in Oakland and Attic Insulation in Berkeley pages if you’re across the bridge, or visit our home page to see the full scope of what we do. Our core Attic Insulation in San Francisco guide covers the full service in depth.
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.
Frequently Asked Questions About Attic Insulation in San Francisco
Attic insulation is a thermal barrier installed on the attic floor or under the roof deck that slows heat transfer between your living space and the outside. In San Francisco, we install blown-in fiberglass, cellulose, or spray foam to reach R-38 to R-49, depending on the home’s construction and budget. The right insulation keeps upstairs rooms comfortable and reduces heating costs by stopping conditioned air from escaping through the ceiling.
Most standard attic insulation jobs in San Francisco, including removal of old material, air sealing, and installation of new blown-in insulation, are completed in one day. Larger attics over 2,000 square feet or jobs requiring extensive mold remediation or ventilation correction may take two days. We schedule a specific arrival window, not a half-day range, and our techs show up when we said they would.
Standard attic insulation in San Francisco runs $1,800 – $4,200, with most homes landing between $2,200 and $3,100. The final number depends on attic size, what’s already up there, whether removal is needed, and whether ventilation corrections are part of the job. Every Alden quote is written, itemized, and guaranteed not to change at the door. Call (559) 245-9792 for a free estimate with a specific number.
We install products from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. Your quote will name the specific brand and product we plan to install, so you can research it independently before committing. We don’t push a single brand; we recommend based on your attic’s construction and your budget.
We answer the phone 24/7, and for situations like a roof leak that has soaked insulation or a ceiling that’s showing water stains, we’ll get a technician out as fast as possible, often same day. True emergencies where water is actively entering the attic take priority. Call (559) 245-9792 and a live person will schedule you immediately.
Every job we do carries a written guarantee that covers workmanship and material performance for 365 days from the completion date. If anything fails within that year, whether it’s settling blow-in that drops below spec or a ventilation issue we should have caught, we come back at no charge and make it right. The guarantee is written, not verbal, and includes a free second visit if needed.
Clear a path to the attic access, usually a hallway or bedroom closet hatch. Move any valuables stored in the attic that could be damaged, though we do cover items that can’t be moved. If you have pets, keep them in a closed room during the visit. We handle the rest, including floor protection and cleanup.
Schedule Your Attic Insulation Service in San Francisco Today
Call (559) 245-9792 for a free, no-obligation estimate. A live person answers, 24/7, and we’ll schedule a background-checked technician to measure your attic and hand you a written price. The number you approve is the number on the invoice, and every job carries our 365-Day Done Right Promise in writing. That’s how Alden Insulation San Francisco has worked since 2002, and it’s how we’ll work for you.
Written by Bryce Holloway, Owner at Alden Insulation San Francisco, serving San Francisco since 2002.