The 25 contractors pulling the most building permits in Thousand Oaks, ranked by PermitStack's activity score — built from 511,724 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | Sunrun Installation Services I | 2,319 | 100 | battery, electrical, ev_charger | Jul 2026 |
| 2 | LLOYDS PLUMBING | 1,436 | 87 | electrical, foundation, hvac | Aug 2026 |
| 3 | Vivint Solar Developer, LLC. | 1,117 | 97 | addition, battery, electrical | Nov 2021 |
| 4 | PACIFIC AIRE, INC | 704 | 95 | addition, electrical, hvac | Jul 2026 |
| 5 | SolarCity Corporation | 686 | 91 | addition, battery, demolition | Aug 2018 |
| 6 | FAST WATER HEATER I INC | 672 | 61 | hvac, plumbing | Aug 2024 |
| 7 | Shelter Roofing and Solar | 610 | 87 | battery, electrical, renovation | Jul 2026 |
| 8 | CONEJO VALLEY ELECTRIC | 590 | 95 | battery, electrical, ev_charger | Aug 2026 |
| 9 | CONEJO SERVICES LLC | 515 | 84 | electrical, ev_charger, hvac | Aug 2026 |
| 10 | Kota Energy | 482 | 72 | battery, electrical, ev_charger | May 2024 |
| 11 | HOME DEPOT | 436 | 100 | addition, battery, demolition | Aug 2026 |
| 12 | August Roofing Inc | 422 | 89 | electrical, interior_remodel, plumbing | Aug 2026 |
| 13 | WESTSIDE REMODELING CORP | 407 | 76 | addition, electrical, hvac | Mar 2025 |
| 14 | THOUSAND OAKS PLUMBING | 398 | 78 | foundation, hvac, plumbing | Dec 2021 |
| 15 | TOP ARMOR ROOFING INC | 386 | 85 | renovation, roofing, solar | Jul 2026 |
| 16 | D M BUILDERS | 378 | 55 | electrical, interior_remodel, plumbing | Oct 2019 |
| 17 | DUTTON PLUMBING INC | 361 | 61 | foundation, interior_remodel, mechanical | Aug 2022 |
| 18 | RENEWAL BY ANDERSEN LLC | 353 | 100 | addition, demolition, electrical | Aug 2026 |
| 19 | SOUTHLAND HEATING AND AIR CONDITIONING | 353 | 80 | electrical, hvac, mechanical | Jul 2026 |
| 20 | QUANTUM SOLAR DESIGNS INC | 350 | 97 | electrical, ev_charger, solar | Dec 2025 |
| 21 | AMERICAN POWER SOLUTIONS INC | 338 | 95 | electrical, ev_charger, hvac | Aug 2024 |
| 22 | Tesla Energy, Inc | 324 | 100 | addition, battery, electrical | Aug 2026 |
| 23 | Energy Service Partners, Inc. | 303 | 100 | battery, electrical, hvac | Oct 2025 |
| 24 | A P ELECTRICAL | 302 | 100 | battery, electrical, ev_charger | Mar 2025 |
| 25 | SUNPOWER CORPORATION SYSTEMS | 279 | 100 | addition, battery, demolition | Dec 2022 |
"Score" is a 0–100 activity index from permit volume, recency, project value, and geographic reach. "Permits" counts building permits this contractor pulled in Thousand Oaks.
Query contractors, scores, and permits programmatically — GET /v1/contractors/search?state=CA&sort=score