Insulation contractor in Larkfield-Wikiup, CA - cooler upstairs, warmer floors
D&R Santa Rosa Spray Foam Insulation is an insulation contractor based in Santa Rosa that insulates and air seals attics, crawl spaces and walls for homes in Larkfield-Wikiup, from drafty older houses to newer builds.
- Licensed and insured.
- Free on-site estimates.
- We respond within 1 business day.
Older and newer homes in Larkfield-Wikiup
Larkfield-Wikiup isn't its own city. It's unincorporated Sonoma County, so building permits here go through the county instead of a city hall. The calls we get out here mostly come from homeowners with a drafty bedroom, a power bill that jumps every winter, or an attic nobody has looked at in years. We're based in Santa Rosa and do the same work in Sebastopol and Windsor, but the houses here have their own mix.
Larkfield Estates was hit hard in the October 2017 fires, and around the area we work on newer houses as well as ones that have stood for decades. That changes the job, because a newer attic usually needs a check and some sealing, while an older one may need the old fill pulled out before anything new goes in.
Our services in Larkfield-Wikiup, CA
- Attic insulation
Older attics here often hold a few inches of settled fill, thin at the edges. We measure what's there, seal the gaps and build the depth evenly to the eaves.
- Insulation removal
After a few wet winters, old attic insulation can be stained from roof leaks or full of droppings, and a top-up just buries that. We pull it out first.
- Crawl space vapor barrier
Rainy months keep crawl spaces here damp, and you feel it in cold floors. We lay a vapor barrier, a plastic sheet over the dirt, before insulating under the floor.
- Attic air sealing
In many houses here, warm air slips out around can lights, pipes and the attic hatch. We seal those gaps first so new insulation isn't fighting a draft.
- Home insulation
A drafty bedroom or hot room over the garage here usually has more than one cause. Our home insulation work checks attic, walls and crawl space together.
- Spray foam insulation
When ductwork runs through a hot attic, insulation on the floor leaves it in the heat. Spray foam under the roof keeps the attic cooler, though it costs more.
What Larkfield-Wikiup weather does to your house
Summers here run hot and dry, and winters run cold and wet. In nearby Santa Rosa, August highs normally reach 84°F, December lows drop to 37°F, and December brings the most rain, nearly 7 inches. In summer that heat builds in the attic and pushes down into the upstairs rooms, so we seal the attic floor before adding insulation and keep the eave vents clear so the attic can still breathe. In winter the rain keeps crawl spaces damp, so I check under the house for standing water or wet framing before anything goes on the floor above it.
The houses vary a lot from one street to the next. In older ones I usually find a few inches of tired fill and sometimes stains from an old leak, while newer ones are more likely to have a room over the garage or ducts in the attic. We measure what's already up there and write it down, so you can see what you're paying for.
Get a free on-site insulation estimate in Larkfield-Wikiup
Tell us what's going on with your Larkfield-Wikiup house through the form or at (707) 508-4085, and we'll reply within one business day. I'll come out myself to look at the attic and crawl space, then go over what I found and what I'd do, and there's no obligation to go ahead.
What insulation work looks like
Larkfield-Wikiup insulation questions answered
Do I need a permit to insulate my house in Larkfield-Wikiup?
You might, and the office that decides is Permit Sonoma, which issues building permits here for everything from site grading to interior improvements, alterations and most repairs. The exemptions it lists are things like small sheds, fences, low decks and same-size window swaps, so check with them before assuming insulation work is exempt. When a job needs a permit, we apply for it, set up the inspections and give you a copy of the paperwork for your records.
Which building code applies to insulation work in Larkfield-Wikiup in 2026?
Permit applications submitted on or after January 1, 2026 have to fully meet the 2025 California Building Standards Code, with no exceptions. The code in effect when the application goes in stays in force for the whole project, so the date your application is submitted sets the rules for the job.
How do I check an insulation contractor's license in California?
Check with the Contractors State License Board, the state board that licenses and regulates California's construction industry to protect homeowners. Ask any contractor for their license before they set foot in your attic. We're licensed and insured, and our work is backed by our satisfaction guarantee.
How much does attic insulation cost in Larkfield-Wikiup?
The price comes down to your attic's size, how many inches are already up there, how much sealing it needs and whether the old material has to come out first. Foam costs more because it seals air while it insulates, but for most attics I'd seal the gaps and top up with blown-in insulation, loose fill we blow in through a hose, unless your ductwork runs up there. I'll give you your own figure after I've seen the house in person.
What causes a hot upstairs in summer in Larkfield-Wikiup?
Usually it's attic heat working down into the rooms below, through thin insulation and unsealed gaps around lights, pipes and the hatch. When the eave vents are buried too, that summer heat has nowhere to go, so we seal the gaps first, clear the vents and make sure the insulation isn't thin at the edges.
How long does spray foam take before we can go back in the house?
You'll wait out the re-entry time for the foam we use, the window before people and pets can come back inside, and I'll tell you what it is before we start. How long our crew is in the attic depends on its size, how much old material comes out and how much sealing it needs, and I'll walk you through that at the estimate.