442 home builders ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Los Altos: ADU Builders Bay Area, CR Score 89/100; 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 442.
Most-reviewed: Royal Building Services, 151 Google reviews at 5.0★, the most of 442 ranked; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
442 Los Altos home builders are ranked here by CR Score, from 8 published factors. 24 are open 24/7, 178 open Saturdays and 121 open Sundays, based on posted hours. The median Google rating is 5.0★ across 442 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | ADU Builders Bay Area | 89 | 5.0★ (134) | San Jose, 13 mi away | Sat · Sun | Overall |
| 2 | Room Addition & Adu Contractor San Jose | 87 | 4.9★ (137) | San Jose, 13 mi away | Sat · Sun · Evenings | — |
| 3 | Primework Construction | 85 | 5.0★ (111) | San Jose, 11 mi away | 24/7 | Emergencies |
| 4 | 408 Real Estate | 85 | 5.0★ (7) | Campbell, 12 mi away | 24/7 | — |
| 5 | Chandani Group, Anthem Realtors & Builders | 85 | 5.0★ (5) | Saratoga, 9 mi away | 24/7 | — |
| 6 | King David Home Builders | 84 | 5.0★ (56) | Palo Alto, 3 mi away | Sat · Sun · Evenings | — |
| 7 | Royal Building Services | 84 | 5.0★ (151) | Mountain View, 3 mi away | Sat · Sun · Evenings | Most reviews |
| 8 | Cupertino ADU Solutions | 84 | 5.0★ (13) | Cupertino, 7 mi away | — | — |
| 9 | Moraga ADU & Addition | 84 | 4.9★ (131) | Moraga, 31 mi away | Sat · Sun · Evenings | — |
| 10 | Nolasco Construction Group | 83 | 5.0★ (9) | Menlo Park, 6 mi away | Sat · Sun | — |
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: 5.0★ from 134 Google reviews, listed on Google as “Custom home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in San Jose, 13 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 6 of 8 factors; credentials and recency not yet collected.
Based in San Jose, 11 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 111 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Campbell, 12 mi away
Ranked #4 because of its Google rating and availability: 5.0★ from 7 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Saratoga, 9 mi away
Ranked #5 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Palo Alto, 3 mi away
Ranked #6 because of its Google rating and availability: 5.0★ from 56 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mountain View, 3 mi away
Ranked #7 because of its Google rating and review volume: 5.0★ from 151 Google reviews, the most Google reviews on this list (151).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cupertino, 7 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Home builder”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Moraga, 31 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 131 Google reviews, listed on Google as “Home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Menlo Park, 6 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Custom home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in San Jose, 11 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 56 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Burlingame, 19 mi away
Ranked #12 because of its Google rating and availability: 5.0★ from 69 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Milpitas, 18 mi away
Ranked #13 because of its Google rating and availability: 5.0★ from 6 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Los Gatos, 16 mi away
Ranked #14 because of its Google rating and availability: 5.0★ from 49 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in San Francisco, 34 mi away
Ranked #15 because of its Google rating and availability: 4.7★ from 14 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sunnyvale, 3 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Custom home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sunnyvale, 5 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Home builder”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Campbell, 3 mi away
Ranked #18 because of its Google rating and availability: 5.0★ from 59 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Milpitas, 12 mi away
Ranked #19 because of its Google rating and review volume: 5.0★ from 101 Google reviews, 101 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Redwood Shores, 17 mi away
Ranked #20 because of its Google rating and availability: 5.0★ from 12 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Redwood Shores, 2 mi away
Ranked #21 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in San Francisco, 30 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Custom home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Campbell, 11 mi away
Ranked #23 because of its Google rating and availability: 4.9★ from 27 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in San Francisco, 29 mi away
Ranked #24 because of its Google rating and availability: 4.7★ from 10 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Redwood City, 8 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 19 Google reviews, listed on Google as “Custom home builder”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 442 ranked home builders here; the rest are on their profiles.
20 more home builders within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
We scored 442 Los Altos home builders 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 Los Altos 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 |