397 home builders ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Alum Rock: ADU Builders Bay Area, CR Score 64/100; 5.0★ from 134 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Primework Construction, posts 24/7 hours; ranked #3 of 397.
Most-reviewed: Royal Building Services, 151 Google reviews at 5.0★, the most of 397 ranked; ranked #15.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
397 Alum Rock home builders are ranked here by CR Score, from ten published factors. 21 are open 24/7, 167 open Saturdays and 125 open Sundays, based on posted hours. The median Google rating is 5.0★ across 397 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | ADU Builders Bay Area | 64 | 5.0★ (134) | San Jose, 4 mi away | Sat · Sun | Overall |
| 2 | Room Addition & Adu Contractor San Jose | 63 | 4.9★ (137) | San Jose, 4 mi away | Sat · Sun · Evenings | — |
| 3 | Primework Construction | 59 | 5.0★ (111) | San Jose, 5 mi away | 24/7 | Emergencies |
| 4 | HD Darris LLC | 58 | 5.0★ (6) | Milpitas, 5 mi away | 24/7 | — |
| 5 | Moraga ADU & Addition | 58 | 4.9★ (131) | Moraga, 36 mi away | Sat · Sun · Evenings | — |
| 6 | 408 Real Estate | 58 | 5.0★ (7) | Campbell, 9 mi away | 24/7 | — |
| 7 | Advantage Homes | 58 | 3.9★ (39) | San Jose, 5 mi away | Sat · Sun | — |
| 8 | Done Right Builders and Remodeling | 58 | 4.7★ (68) | Santa Clara, 6 mi away | Evenings | — |
| 9 | Chando Construction | 57 | 4.8★ (108) | Mountain View, 15 mi away | — | — |
| 10 | DevArt8 Builders | 57 | 5.0★ (101) | Milpitas, 5 mi away | Sat · Sun · Evenings | — |
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 134 Google reviews, listed on Google as “Custom home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 4 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 137 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 5 mi away
Ranked #3 because of its Google rating and review volume: 5.0★ from 111 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milpitas, 5 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Moraga, 36 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 131 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Campbell, 9 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Custom home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 5 mi away
Ranked #7 because of its Google rating and trade focus: 3.9★ from 39 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santa Clara, 6 mi away
Ranked #8 because of its Google rating and trade focus: 4.7★ from 68 Google reviews, listed on Google as “Custom home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mountain View, 15 mi away
Ranked #9 because of its Google rating and trade focus: 4.8★ from 108 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milpitas, 5 mi away
Ranked #10 because of its Google rating and review volume: 5.0★ from 101 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milpitas, 6 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Custom home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Saratoga, 13 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 8 mi away
Ranked #13 because of its Google rating and review volume: 5.0★ from 88 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 5 mi away
Ranked #14 because of its Google rating and review volume: 4.9★ from 56 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Mountain View, 13 mi away
Ranked #15 because of its Google rating and review volume: 5.0★ from 151 Google reviews, the most in Alum Rock.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Los Gatos, 5 mi away
Ranked #16 because of its Google rating and trade focus: 4.7★ from 12 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Cupertino, 12 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Home builder”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Palo Alto, 18 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 56 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 3 mi away
Ranked #19 because of its Google rating and review volume: 5.0★ from 54 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 6 mi away
Ranked #20 because of its Google rating and trade focus: 4.7★ from 24 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Newark, 17 mi away
Ranked #21 because of its Google rating and trade focus: 4.0★ from 84 Google reviews, listed on Google as “Home builder”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Tracy, 29 mi away
Ranked #22 because of its Google rating and trade focus: 4.3★ from 58 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Campbell, 10 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Jose, 5 mi away
Ranked #24 because of its Google rating and review volume: 4.9★ from 131 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Milpitas, 6 mi away
Ranked #25 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Custom home builder”.
Based on 8 of 10 factors; credentials and recency not yet collected.
We scored 397 Alum Rock home builders 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 Alum Rock 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 |