Insulation Company in San Anselmo, CA
Thistledown Attic Insulation helps San Anselmo homeowners fix the quiet problems hiding above their ceilings: settled fiberglass, empty wall cavities, and attic hatches that leak conditioned air all year long. Most houses here were built between the 1920s and 1970s, and many have little or no insulation in their sloped ceilings and walls. That changes how we approach every job in San Anselmo, from choosing the right product to protecting original plaster and wood framing. Call (341) 247-0222 and we’ll walk you through what your attic actually needs.
Why San Anselmo Homes Are Different
San Anselmo’s older Craftsman bungalows and ranch-style houses were built for a climate that rarely gets very hot or very cold, so insulation was often an afterthought. Crews frequently find zero insulation in the sloped ceilings of second-story bedrooms in 1920s bungalows, which means those rooms bake in summer and feel drafty in winter. The mild Mediterranean climate shifts the focus away from extreme temperature barriers and toward air sealing and moisture control. Cool, wet winters make condensation a real concern in unvented attics, while dry summers and wildfire season mean many homeowners want a tighter building envelope that keeps smoke from drifting inside. Retrofits here must also navigate plaster walls, limited attic access through small closet hatches, and original wood framing that deserves to be treated carefully.
Noise is another factor we hear about often. Homes near Sir Francis Drake Boulevard pick up steady road hum, and a properly dense insulation layer in the attic and walls makes a measurable difference. We also respect that these are older homes with character. We ask before moving anything in a finished attic, we keep our tools quiet, and we lay drop cloths across your hallway from the front door to the attic hatch. Every San Anselmo job starts with that same care.
Our Main San Anselmo Services
Most San Anselmo homeowners call us about two things: bringing attic insulation up to current standards and sealing hard-to-reach areas with spray foam. Each service has its own San Anselmo page with detailed pricing and what to expect.
Attic Insulation in San Anselmo
Attic insulation in San Anselmo usually means working around old framing, tight hatches, and occasionally knob-and-tube wiring that requires careful planning before any material goes in. We inspect what’s already up there, measure settled depth, and recommend whether to add a fresh layer or remove and replace. Many older homes here have fiberglass batts that have compressed to a fraction of their original R-value. We carry Owens Corning, Johns Manville, and GreenFiber products and will give you a written price before we touch a rafter. See Attic Insulation in San Anselmo for full details, including typical project ranges.
Spray Foam Insulation in San Anselmo
Spray foam earns its keep in San Anselmo’s sloped ceilings, rim joists, and awkward transitions where older framing leaves gaps that batts can’t fill. It seals air leaks and adds structural rigidity without disturbing original plaster. This matters for homes where wildfire smoke infiltration is a concern, because a continuous air barrier keeps more of that outside air outside. We work with Demilec and Icynene products, and every job gets drop cloths, shoe covers, and a photo of the clean-up before we leave. Read Spray Foam Insulation in San Anselmo for what to expect and what it costs.
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.
Brands We Service in San Anselmo
We install eight insulation brands and choose the one that fits the house rather than the one that fits the truck. For San Anselmo’s older homes, that often means Owens Corning or Johns Manville batts for attic floors and walls, GreenFiber blown-in cellulose for hard-to-reach cavities, and Demilec spray foam for air sealing tricky transitions. See our brands for how we match product to project. We keep common San Anselmo sizes and materials stocked locally, so most jobs can be scheduled within days, not weeks.
Pricing for Insulation Company in San Anselmo, CA
| Service | Typical range in San Anselmo |
|---|---|
| Attic insulation audit and air-seal package | $900 – $1,800 |
| Blown-in fiberglass attic insulation (1,000 sq. ft.) | $1,500 – $2,700 |
| Blown-in cellulose attic insulation (1,000 sq. ft.) | $1,800 – $3,200 |
| Spray foam attic insulation (open-cell, 1,000 sq. ft.) | $3,500 – $6,500 |
| Spray foam attic insulation (closed-cell, 1,000 sq. ft.) | $5,000 – $9,000 |
| Attic air sealing (foam and caulk, typical bungalow attic) | $700 – $1,400 |
| Insulation removal and disposal (1,000 sq. ft.) | $1,200 – $2,500 |
| Wall insulation retrofit (blown-in, per wall section) | $800 – $1,800 |
Prices in San Anselmo can shift upward when access is unusually tight, when original plaster requires protective work, or when old wiring needs to be checked before insulation touches it. Whatever the final number, it will be in writing before any work starts. If it’s not done right, our 365-Day Done Right Promise means we make it right, no debate.
Neighborhoods We Serve in San Anselmo
We work across San Anselmo, from the flats near downtown to the hillside streets where driveways get steep and attics get creative. Typical response time for an estimate in town is within 24 to 48 hours, with many attic inspections done same-week.
- Sleepy Hollow
- Barber Tract
- Lansdale
- Oak Springs Hill
- Downtown San Anselmo
Service Area – Cities Near San Anselmo
Our San Anselmo crews also cover nearby Marin and East Bay communities. If you’re a little outside town, we likely still have a truck in your area. We serve Novato, CA, Richmond, CA, San Pablo, CA, and Pinole, CA with the same written-price promise and clean-up standard.
Serving San Anselmo, CA - Our Local Coverage Area
We’re based in the San Anselmo 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 Company in San Anselmo
Most San Anselmo homeowners get an estimate visit within 24 to 48 hours. If your attic is actively leaking air or you have an urgent smoke-infiltration concern during fire season, call (341) 247-0222 and a live person will help you schedule, day or night.
Most attic insulation and air-sealing work does not require a permit in San Anselmo, but some structural spray foam applications may. We’ll tell you during the estimate if your project triggers anything, and we handle the paperwork on our end when it does.
We plan every San Anselmo job around quiet hours when children are napping or when the house is calm. We use quiet tools where possible, we ask before moving anything, and we’re happy to schedule for a weekday while the kids are at school. Every visit includes shoe covers, drop cloths, and a photo of the clean-up before we head out.
Call (341) 247-0222 for a free estimate, and we’ll give you a written price before any work begins. Thistledown is the soft fluff of the thistle, one of nature’s lightest insulators. The name is a promise about how carefully we work in your home.
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 same-day.
- 4You approve before work beginsNothing starts until you say go.
What San Anselmo Customers Say
"Removed the old flattened insulation and blew in new. They were so careful not to track anything through the house, booties on, drop cloths down. Cleaned up spotless after."
- Kelvin Osei"Solid attic job. A little of the old insulation dust settled near the hatch, but they came back up and vacuumed it when I pointed it out. Otherwise careful and the house is warmer."
- Cindy Vasquez"Attic insulation with a newborn in the house. The crew was quiet, laid protection on every floor they crossed, and hauled off all the old material. Left it spotless and the house is cozier already."
- Corinne Dyer