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Top-Rated Spray foam insulation pros in Hopland - Updated Nov 2026

Avatar for Redwood Insulation
Redwood Insulation
4.9(
16
)

Serving Hopland, CA and surrounding areas

Approved

In business since 2018

Free estimates

Customers say: Quick response

"Matt completed the insulation of my crawl space with spray foam quickly and at a very competitive cost. I highly recommend Redwood Insulation without reservation."
Response time2 days
9 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Coast Building Products
Coast Building Products
4.5(
14
)

Serving Hopland, CA and surrounding areas

Approved (Corporate)

In business since 1950

Free estimates

Credit card accepted

"Cruz helped us understand our options and visited twice to finalize the scope of work. Insulation team was punctual and provided expert craftsmanship. Glad I chose Coast."
Spary foam rooof line
Batt installatoin
Applying Spray Fiam
Response time8 hrs
Response rate100%
28 neighbors recently requested a quote
Avatar for Apperson Energy Management
Apperson Energy Management
4.7(
56
)

Serving Hopland, CA and surrounding areas

In business since 1983

Free estimates

Warranties offered

"Sergio the estimator arrived on time was exceptionally thorough. I was only looking for attic insulation, but Sergio asked if I had insulation in my walls. I assumed I did, he checked I did not, as I have an older home. Jon was wonderful answering my questions and calls. Luis and Jose arrived on time they did a fabulous job insulating my attic and walls and were very neat and clean I needed some help clearing some shelves in the garage for wall insulation and Jon sent his son Connor help me. I highly recommend them"
Recommended by100%of homeowners
Avatar for All Pest Pros
All Pest Pros
4.0(
105
)
Insulation - Install or Upgrade

Serving Hopland, CA and surrounding areas

In business since 2000

Free estimates

Credit card accepted

"It went rough, but we were both at fault. Had to say that first. But I am mostly satisfied. The outside sales person was on time for the walk through. He was nice and seemed knowledgeable. He had a lot of prior experience as a laborer before he became a sales rep. He was able to present his company and offer a quote on the spot. I agreed and gave him a deposit. Off we go. Right? Well, he based his quote on 700 square feet when it was actually 1100. That's why his price was low. You would think that I got a deal. But no. The labor crew only showed up with enough insulation for 700 SF. Not enough. So here is what we had to do. Introduce Jose. The lead man on the project. If it were not for him, it would have went south in a hurry. Turns out that Jose is a good person with a soul, and I am happy to "work with" a great person like Jose. APP is lucky to have him, and I hope they are taking good care of him. Just so you don't think I am fake, the "helper" that Jose had that day was worthless. Didn't want to work because he is a 20 year old kid who was out all night drinking and chasing girls (or boys), and was hung over. I did more 90% more work than he did (yes, I helped Jose. I have a good soul too). I let Jose vacuum out the old stuff, then I made him stop. He understood. Come back when you have 1100SF of insulation. Right? Before he took off, Jose up-sold me on insulating the bottom of my house (in between the floor joists under the sub floor)(under the house), applying a radiant barrier in the attic and switching from blown in cellulose with the pink panther batts. I ended up insulating under the house by myself. Nice. I communicated that to APP, but it got lost in translation. When the day arrived that Jose returned with 1100SF of material to finish the job, he showed up with two helpers. BTW, I had to request the APP office to please make sure Jose was who they sent to complete my job. Regardless of my implicit instructions that I subsequently made with the APP office, that I changed my mind and now want blown in cellulose again, and NO radiant barrier, Jose and crew still showed up with pink panther batts and radiant barrier. Whatever. The crew is there, lets get to work. The reason I only give them a B is because they installed the radian barrier wrong (in my opinion). I did research and radiant barrier should be one inch from the roof sheeting (plywood) if it's hot southern California. They stapled it to the 2x4 rafters so it's really 3-1/2 inches from the sheeting. Not sure if it is even radiating anything at this point. I think I just wasted a $1000. Even so, my neighbor asked me who did the job, and I ended up giving them the APP biz card, so I guess that was kind of a recommendation."
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Recommended by83%of homeowners
Avatar for Landmark Energy Upgrades
Landmark Energy Upgrades
4.8(
59
)
Insulation - Install or Upgrade

Serving Hopland, CA and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"Overall, they did a good job. They are friendly and very helpful. we had a little mess to clean up after, but to be fair, I didn't complain -- if i had they would have come back. Preferably they would have come back to check on their own."
Cool Roof Install
Energy Upgrade
HVAC Air Duct
Home Energy Audit
Energy Upgrade Contractors

+6

Recommended by98%of homeowners
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FAQs for spray foam insulation projects in Hopland, CA

Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.

R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.

Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.

You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.

Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.