The 25 contractors pulling the most building permits in San Mateo, ranked by PermitStack's activity score — built from 85,638 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | DISCOUNT PLUMBING ROOTER SERVICES LLC | 835 | 86 | electrical, hvac, plumbing | Jun 2026 |
| 2 | Wizard Plumbing and Drain | 612 | 83 | electrical, plumbing, solar | Oct 2025 |
| 3 | Alexander Company | 415 | 83 | interior_remodel, new_construction, renovation | Jun 2026 |
| 4 | Sunrun Inc | 394 | 100 | addition, battery, electrical | Jun 2026 |
| 5 | SIGNATURE ROOFING | 388 | 93 | renovation, roofing | Jun 2026 |
| 6 | FAST WATER HEATER COMPANY | 368 | 99 | electrical, hvac, interior_remodel | Jun 2026 |
| 7 | IZMIRIAN ROOFING AND SHEET METAL | 327 | 78 | electrical, hvac, interior_remodel | Feb 2026 |
| 8 | Caccia Home Services Inc | 320 | 77 | electrical, ev_charger, hvac | Apr 2026 |
| 9 | JD CESARE CONSTRUCTION, INC. | 316 | 77 | electrical, plumbing | Jun 2026 |
| 10 | Tesla Energy, Inc | 302 | 100 | addition, battery, electrical | Jun 2026 |
| 11 | BULLSEYE PLUMBING | 265 | 76 | electrical, plumbing | Jun 2026 |
| 12 | MONTEREY CONSTRUCTION LLC | 255 | 81 | electrical, fence, interior_remodel | Jun 2026 |
| 13 | Lindstrom Company | 248 | 75 | electrical, plumbing | Jun 2026 |
| 14 | EXPRESS PLUMBING | 246 | 97 | addition, electrical, fire_alarm | Jun 2026 |
| 15 | AFFORDABLE WATER HEATERS LLC | 177 | 79 | electrical, hvac, mechanical | May 2021 |
| 16 | HOME DEPOT USA INC | 173 | 100 | addition, electrical, fence | May 2026 |
| 17 | Eminent Electrical | 172 | 76 | demolition, electrical, ev_charger | Jun 2026 |
| 18 | TECHPRO BUILDERS INC | 162 | 82 | electrical, hvac, interior_remodel | Jun 2026 |
| 19 | BROTHERS HOME IMPROVEMENT INC | 154 | 96 | addition, interior_remodel, new_construction | Jun 2026 |
| 20 | FUSE SERVICE INC. | 139 | 96 | addition, battery, electrical | Jul 2026 |
| 21 | AMERICAN WATER HEATER SERVICE INC. | 138 | 77 | electrical, plumbing | Jun 2026 |
| 22 | BAY AREA RE-ROOFING | 132 | 77 | roofing | May 2026 |
| 23 | ADARY ELECTRIC INC | 132 | 76 | electrical, ev_charger, hvac | Jun 2026 |
| 24 | Golden Roofing Company | 128 | 75 | roofing | Jun 2026 |
| 25 | AECO Systems | 126 | 80 | addition, battery, demolition | 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 San Mateo.
Query contractors, scores, and permits programmatically — GET /v1/contractors/search?state=CA&sort=score