17 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Sebastopol: Under The House., CR Score 61/100; 5.0★ from 62 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): KC Home Services Plumbing, Heating & AC Repair, posts 24/7 hours; ranked #2 of 17.
Most-reviewed: KC Home Services Plumbing, Heating & AC Repair, 827 Google reviews at 4.9★, the most of 17 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
17 Sebastopol insulation contractors are ranked here by CR Score, from ten published factors. 2 are open 24/7, 9 open Saturdays and 5 open Sundays, based on posted hours. The median Google rating is 5.0★ across 17 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Under The House. | 61 | 5.0★ (62) | Santa Rosa, 5 mi away | Sat · Sun · Evenings | Overall |
| 2 | KC Home Services Plumbing, Heating & AC Repair | 60 | 4.9★ (827) | Santa Rosa, 6 mi away | 24/7 | Emergencies, Most reviews |
| 3 | Clean CrawlSpace Inc. | 57 | 5.0★ (57) | Santa Rosa, 6 mi away | — | — |
| 4 | Insulation Solutions | 55 | 4.9★ (29) | Santa Rosa, 8 mi away | — | — |
| 5 | Atticare | 54 | 5.0★ (15) | Petaluma, 13 mi away | Sat | — |
| 6 | Santa Rosa Spray Foam Insulation | 54 | 5.0★ (24) | Santa Rosa, 10 mi away | — | — |
| 7 | Sonoma Insulation Company | 54 | 5.0★ (6) | Larkfield-Wikiup, 7 mi away | Sat | — |
| 8 | MKM Insulation Contractor of Santa Rosa CA | 54 | 5.0★ (6) | Santa Rosa, 8 mi away | Sat · Evenings | — |
| 9 | North Bay Insulation Inc | 54 | 4.0★ (6) | Santa Rosa, 7 mi away | — | — |
| 10 | Cal Spray Foam Insulation | 54 | 5.0★ (7) | Larkfield-Wikiup, 10 mi away | Sat | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 62 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 6 mi away
Ranked #2 because of its Google rating and review volume: 4.9★ from 827 Google reviews, the most in Sebastopol.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 6 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 57 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 29 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 13 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 10 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Larkfield-Wikiup, 7 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 7 mi away
Ranked #9 because of its Google rating and trade focus: 4.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Larkfield-Wikiup, 10 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Novato, 25 mi away
Ranked #11 because of its Google rating and trade focus: 4.7★ from 10 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 6 mi away
Ranked #12 because of its Google rating and trade focus: 4.4★ from 9 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Cotati, 8 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Petaluma, 14 mi away
Ranked #14 because of its Google rating and trade focus: 3.5★ from 19 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Rosa, 3 mi away
Ranked #15 because of its Google rating and trade focus: 3.8★ from 5 Google reviews, listed on Google as “Roofing contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Fairfield, 15 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Corte Madera, 24 mi away
Ranked #17 because of its Google rating and trade focus: 4.0★ from 4 Google reviews, listed on Google as “Pest control service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
14 more insulation contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| B & D Insulation | 5.0★ (1) | 6 mi |
| California State Insulation | 5.0★ (2) | 4 mi |
| Certified Specialists, Inc. | 5.0★ (2) | 6 mi |
| Ecco Insulation | 22 mi | |
| HVAC Essentials | 5.0★ (30) | In Sebastopol |
| North Bay Insulation | 4 mi | |
| North Bay Pacific Insulators | 5.0★ (1) | 7 mi |
| Rohnert Park attic insulation | 1.0★ (1) | 9 mi |
| S.A.F.E- Mold, Attics & Ceawl Space Restoration | 17 mi | |
| Solar Works | 4.8★ (32) | In Sebastopol |
| Sustainable Living Builders, Inc | 4.9★ (84) | In Sebastopol |
| Valente's Handyman Service | 1.0★ (1) | 5 mi |
| VITAL ENERGY SOLUTIONS | 4.9★ (84) | In Sebastopol |
| Zero Energy Associates | 5.0★ (9) | In Sebastopol |
National price ranges in USD, not adjusted for Sebastopol. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 17 Sebastopol insulation contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Sebastopol data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |