The 25 contractors pulling the most building permits in Sunnyvale, ranked by PermitStack's activity score — built from 76,112 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | FUSE SERVICE INC. | 289 | 96 | addition, battery, electrical | Jul 2026 |
| 2 | SERVICE CHAMPIONS | 198 | 100 | addition, electrical, hvac | Jul 2026 |
| 3 | TESLA INC | 165 | 100 | addition, battery, electrical | Jun 2026 |
| 4 | Sunrun Inc | 126 | 100 | addition, battery, electrical | May 2026 |
| 5 | WARNER CUSTOM HOMES | 121 | 91 | foundation, interior_remodel, mechanical | Apr 2026 |
| 6 | Landsea Homes | 118 | 81 | electrical, fence, fire_alarm | Jul 2023 |
| 7 | Devcon Construction | 109 | 88 | addition, battery, demolition | Jun 2026 |
| 8 | RTS Systems & Design LLC | 108 | 80 | addition, demolition, electrical | Jun 2026 |
| 9 | MONTEREY CONSTRUCTION COMPANY | 98 | 63 | demolition, electrical, interior_remodel | Jul 2024 |
| 10 | Sentinel Fire Protection Service | 88 | 70 | fire_alarm, hvac, roofing | Jun 2026 |
| 11 | SAARMAN CONSTRUCTION LTD | 87 | 80 | addition, interior_remodel, mechanical | Feb 2025 |
| 12 | Milroy Construction | 81 | 73 | addition, demolition, electrical | May 2026 |
| 13 | IRBIS HVAC | 80 | 84 | electrical, ev_charger, hvac | Jun 2026 |
| 14 | BFP FIRE PROTECTION , INC. | 80 | 79 | addition, demolition, fire_alarm | Jun 2026 |
| 15 | THORPE DESIGN INC | 69 | 100 | addition, demolition, fire_alarm | Jun 2026 |
| 16 | XL CONSTRUCTION CORP | 69 | 81 | addition, demolition, electrical | Feb 2026 |
| 17 | SunPower Corp | 60 | 100 | battery, electrical, hvac | Mar 2024 |
| 18 | Redwood Electric Group Inc | 57 | 77 | addition, electrical, ev_charger | Jun 2026 |
| 19 | WEST VALLEY CONSTRUCTION | 54 | 81 | electrical, fence, interior_remodel | Jun 2026 |
| 20 | COBE CONSTRUCTION INC | 50 | 75 | addition, demolition, electrical | Feb 2026 |
| 21 | BARTHOLOMEW CONSTRUCTION LLC | 50 | 69 | foundation, renovation | Jan 2026 |
| 22 | SEMPER SOLARIS CONSTRUCTION INC | 45 | 100 | battery, electrical, ev_charger | Feb 2026 |
| 23 | Clean Solar.Inc.. | 45 | 100 | battery, electrical, roofing | Dec 2025 |
| 24 | Willow Glen Electric, Inc. | 45 | 85 | battery, electrical, ev_charger | Jan 2026 |
| 25 | WNH CONSTRUCTION INC | 45 | 71 | electrical, foundation, hvac | Jun 2026 |
"Score" is a 0–100 activity index from permit volume, recency, project value, and geographic reach. "Permits" counts building permits this contractor pulled in Sunnyvale.
Query contractors, scores, and permits programmatically — GET /v1/contractors/search?state=CA&sort=score