The 25 contractors pulling the most building permits in Seattle Trade, ranked by PermitStack's activity score — built from 280,237 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | Greenwood Heating & Home Services | 11,419 | 61 | electrical, ev_charger, hvac | May 2026 |
| 2 | WASHINGTON ENERGY SERVICES CO | 8,186 | 73 | electrical, ev_charger, hvac | May 2026 |
| 3 | HOME COMFORT ALLIANCE | 6,848 | 76 | electrical, ev_charger, hvac | May 2026 |
| 4 | Evergreen Home Heating & Energy | 4,541 | 60 | electrical, hvac, interior_remodel | May 2026 |
| 5 | INNOVATIVE COMFORT SYSTEMS INC | 4,373 | 79 | electrical, hvac, mechanical | May 2026 |
| 6 | BOBS HEATING AND AIR CONDITIONING | 4,153 | 77 | electrical, hvac, mechanical | May 2026 |
| 7 | Otis Elevator Company | 3,673 | 86 | electrical, fire_alarm, interior_remodel | May 2026 |
| 8 | BRENNAN HEATING & AIR CONDITIONING | 3,438 | 60 | electrical, ev_charger, hvac | May 2026 |
| 9 | McKinstry Co LLC | 3,331 | 88 | addition, demolition, electrical | May 2026 |
| 10 | GREENWOOD HEATING AND AC | 3,099 | 70 | electrical, hvac, interior_remodel | Mar 2022 |
| 11 | EVERGREEN REFRIGERATION LLC | 2,656 | 87 | addition, electrical, hvac | Oct 2022 |
| 12 | NORTHSHORE HEATING LLC | 2,489 | 77 | hvac, mechanical | May 2026 |
| 13 | MACDONALD-MILLER SERVICE INC | 2,303 | 36 | electrical, hvac, interior_remodel | Dec 2018 |
| 14 | NORTHWEST EXPERT HEATING LLC | 2,232 | 60 | hvac, interior_remodel, mechanical | Feb 2026 |
| 15 | SELECT AIR SERVICE | 2,015 | 36 | hvac, mechanical, renovation | Apr 2018 |
| 16 | KONE INC (PRIMARY) | 1,941 | 61 | addition, electrical, fire_alarm | May 2026 |
| 17 | HD PARTNERS LLC | 1,751 | 75 | hvac, mechanical, plumbing | May 2026 |
| 18 | OLSON ENERGY SERVICE | 1,681 | 53 | electrical, ev_charger, hvac | Jan 2017 |
| 19 | SUNDANCE ENERGY SERVICES INC | 1,672 | 82 | electrical, hvac, interior_remodel | May 2026 |
| 20 | Hermanson Company LLP | 1,653 | 87 | addition, demolition, electrical | Apr 2026 |
| 21 | FISCHER HEATING AND AIR | 1,541 | 60 | addition, electrical, hvac | May 2026 |
| 22 | EMERALD AIRE, INC. | 1,540 | 86 | addition, electrical, fire_alarm | May 2026 |
| 23 | MACDONALD MILLER FACILITY SOLUTIONS LLC | 1,472 | 85 | addition, demolition, electrical | May 2026 |
| 24 | ROSSOE ENERGY SYSTEMS INC | 1,427 | 54 | electrical, hvac, mechanical | Oct 2017 |
| 25 | Green Top Heating | 1,412 | 62 | hvac, mechanical, roofing | May 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 Seattle Trade.
Query contractors, scores, and permits programmatically — GET /v1/contractors/search?state=WA&sort=score