12 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Castroville: Coast Building Products:, CR Score 80/100; 4.6★ from 7 Google reviews.
Best for emergencies (open 24/7): Reactic Restoration, posts 24/7 hours; ranked #2 of 12.
Most-reviewed: Garlic City Handyman Services, 53 Google reviews at 4.9★, the most of 12 ranked; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
12 Castroville insulation contractors are ranked here by CR Score, from 8 published factors. 2 are open 24/7, 3 open Saturdays and 2 open Sundays, based on posted hours. The median Google rating is 5.0★ across 12 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Coast Building Products: | 80 | 4.6★ (7) | Gilroy, 20 mi away | — | Overall |
| 2 | Reactic Restoration | 80 | 5.0★ (13) | Santa Cruz, 21 mi away | 24/7 | Emergencies |
| 3 | Sanden Insulation | 77 | 5.0★ (13) | Watsonville, 14 mi away | — | — |
| 4 | Nor-Cal Insulation Inc. | 77 | 5.0★ (22) | Hollister, 21 mi away | — | — |
| 5 | Ponzini Insulation Inc | 77 | 4.6★ (12) | Prunedale, 13 mi away | — | — |
| 6 | HM Insulation Inc. | 76 | 5.0★ (22) | Aptos, 25 mi away | — | — |
| 7 | JC Insulation & Acustical Inc | 74 | 5.0★ (3) | Prunedale, 9 mi away | Sat | — |
| 8 | Dirty Duct Guys LLC | 74 | 5.0★ (3) | Hollister, 25 mi away | 24/7 | — |
| 9 | Davi Plastering Inc | 72 | 3.7★ (3) | Monterey, 14 mi away | — | — |
| 10 | Garlic City Handyman Services | 72 | 4.9★ (53) | Gilroy, 20 mi away | — | Most reviews |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 4.6★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Santa Cruz, 21 mi away
Ranked #2 because of its Google rating and availability: 5.0★ from 13 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Watsonville, 14 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hollister, 21 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Prunedale, 13 mi away
Ranked #5 because of its Google rating and trade focus: 4.6★ from 12 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aptos, 25 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Prunedale, 9 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hollister, 25 mi away
Ranked #8 because of its Google rating and availability: 5.0★ from 3 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Monterey, 14 mi away
Ranked #9 because of its Google rating and trade focus: 3.7★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gilroy, 20 mi away
Ranked #10 because of its Google rating and review volume: 4.9★ from 53 Google reviews, the most Google reviews on this list (53).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gilroy, 19 mi away
Ranked #11 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Prunedale, 14 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
10 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 |
|---|---|---|
| ALCAL Specialty Contracting Gilroy - Home Service Division | 19 mi | |
| Bay Plastering | 3.0★ (2) | 22 mi |
| Coast Building Products | 21 mi | |
| Godinez insulation inc | 5.0★ (1) | 7 mi |
| Golden Duct Cleaning Service | 8 mi | |
| Golden West Insulation Co | 10 mi | |
| Performance Foam Tech | 11 mi | |
| Santa Cruz Insulation | 20 mi | |
| South Bay Spray Foam | 21 mi | |
| Stellar Attic Inc. | 5.0★ (1) | 21 mi |
National price ranges in USD, not adjusted for Castroville. 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 12 Castroville insulation contractors on 8 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. Unknown factors are left out of the score, 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 Castroville data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |