The 25 contractors pulling the most building permits in Portolavalley, ranked by PermitStack's activity score — built from 17,887 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | Cobalt Power Systems. Inc. | 130 | 100 | battery, electrical, ev_charger | Jul 2026 |
| 2 | COBALT CONSTRUCTION COMPANY | 62 | 73 | addition, electrical, fence | Oct 2025 |
| 3 | ALTERNATIVE HVAC SOLUTIONS, LLC | 50 | 75 | electrical, hvac, mechanical | Aug 2026 |
| 4 | SABER ROOFING INC. | 49 | 82 | interior_remodel, roofing, solar | Jun 2026 |
| 5 | SHELTON ROOFING CO INC | 48 | 77 | battery, interior_remodel, roofing | Jun 2026 |
| 6 | Willow Glen Electric, Inc. | 46 | 85 | battery, electrical, ev_charger | May 2025 |
| 7 | BILL HAMILTON ROOFING INC | 45 | 77 | renovation, roofing | May 2026 |
| 8 | Build Group | 35 | 81 | addition, demolition, electrical | Jun 2026 |
| 9 | CSI Custom Homes | 30 | 67 | addition, demolition, electrical | Jul 2026 |
| 10 | SEMPER SOLARIS CONSTRUCTION INC | 27 | 100 | battery, electrical, ev_charger | Mar 2025 |
| 11 | Solar City DBA Tesla Energy | 25 | 40 | battery, ev_charger, solar | Feb 2020 |
| 12 | ENVIROTEK RESTORATION, INC | 22 | 71 | demolition, electrical, foundation | Sep 2025 |
| 13 | PORTOLA VALLEY BUILDERS, INC. | 22 | 68 | addition, demolition, electrical | Jul 2026 |
| 14 | R. J. DAILEY CONSTRUCTION CO | 22 | 55 | demolition, electrical, interior_remodel | Nov 2023 |
| 15 | Cinnamon Energy Systems, Inc | 21 | 100 | battery, electrical, hvac | Jul 2026 |
| 16 | IZMIRIAN ROOFING & SHEET METAL | 21 | 56 | hvac, interior_remodel, mechanical | Aug 2023 |
| 17 | Clean Solar.Inc.. | 20 | 99 | battery, electrical, roofing | Jun 2026 |
| 18 | RESIDENTIAL HEATING & A/C INC | 20 | 56 | hvac | Aug 2025 |
| 19 | VANCE BROWN INC | 19 | 70 | addition, demolition, electrical | Aug 2025 |
| 20 | FUSE SERVICE INC. | 17 | 96 | addition, battery, electrical | Jun 2026 |
| 21 | Valley Heating & Cooling | 17 | 61 | hvac, plumbing, renovation | Jan 2025 |
| 22 | Sunrun Installation Services, Inc | 16 | 100 | addition, battery, electrical | Oct 2025 |
| 23 | INFINIUM SOLAR, INC. | 16 | 100 | battery, electrical, ev_charger | Aug 2026 |
| 24 | SLBM INC | 16 | 57 | addition, electrical, interior_remodel | Apr 2025 |
| 25 | Bay Area Energy Solutions, Inc. | 15 | 95 | battery, solar | Jun 2025 |
"Score" is a 0–100 activity index from permit volume, recency, project value, and geographic reach. "Permits" counts building permits this contractor pulled in Portolavalley.
Query contractors, scores, and permits programmatically — GET /v1/contractors/search?state=CA&sort=score