The 25 contractors pulling the most building permits in Seattle Trade, ranked by PermitStack's activity score — built from 285,961 permits on file. Updated from live public records.
| # | Contractor | Permits | Score | Top trades | Last permit |
|---|---|---|---|---|---|
| 1 | Greenwood Heating & Home Services | 11,979 | 89 | battery, electrical, ev_charger | Sep 2026 |
| 2 | WASHINGTON ENERGY SERVICES CO | 8,298 | 100 | addition, electrical, ev_charger | Sep 2026 |
| 3 | HOME COMFORT ALLIANCE | 6,936 | 98 | electrical, ev_charger, hvac | Sep 2026 |
| 4 | Evergreen Home Heating & Energy | 4,684 | 86 | battery, electrical, hvac | Sep 2026 |
| 5 | INNOVATIVE COMFORT SYSTEMS INC | 4,400 | 89 | electrical, hvac, mechanical | Sep 2026 |
| 6 | BOBS HEATING AND AIR CONDITIONING | 4,257 | 93 | addition, electrical, hvac | Sep 2026 |
| 7 | Otis Elevator Company | 3,698 | 100 | addition, battery, demolition | Aug 2026 |
| 8 | BRENNAN HEATING & AIR CONDITIONING | 3,468 | 87 | electrical, ev_charger, hvac | Sep 2026 |
| 9 | McKinstry Co LLC | 3,357 | 100 | addition, battery, demolition | Sep 2026 |
| 10 | GREENWOOD HEATING AND AC | 3,099 | 69 | electrical, hvac, interior_remodel | Mar 2022 |
| 11 | EVERGREEN REFRIGERATION LLC | 2,656 | 95 | addition, electrical, hvac | Oct 2022 |
| 12 | NORTHSHORE HEATING LLC | 2,519 | 88 | hvac, mechanical | Sep 2026 |
| 13 | MACDONALD-MILLER SERVICE INC | 2,303 | 61 | electrical, hvac, interior_remodel | Dec 2018 |
| 14 | NORTHWEST EXPERT HEATING LLC | 2,232 | 90 | hvac, interior_remodel, mechanical | Feb 2026 |
| 15 | SELECT AIR SERVICE | 2,015 | 54 | hvac, interior_remodel, mechanical | Apr 2018 |
| 16 | KONE INC (PRIMARY) | 1,951 | 86 | addition, battery, electrical | Aug 2026 |
| 17 | HD PARTNERS LLC | 1,786 | 92 | addition, hvac, interior_remodel | Aug 2026 |
| 18 | SUNDANCE ENERGY SERVICES INC | 1,689 | 95 | addition, electrical, hvac | Aug 2026 |
| 19 | OLSON ENERGY SERVICE | 1,681 | 62 | electrical, ev_charger, hvac | Jan 2017 |
| 20 | Hermanson Company LLP | 1,657 | 99 | addition, battery, demolition | Jun 2026 |
| 21 | FISCHER HEATING AND AIR | 1,570 | 86 | addition, electrical, hvac | Aug 2026 |
| 22 | EMERALD AIRE, INC. | 1,553 | 97 | addition, demolition, electrical | Sep 2026 |
| 23 | MACDONALD MILLER FACILITY SOLUTIONS LLC | 1,500 | 95 | addition, demolition, electrical | Sep 2026 |
| 24 | Green Top Heating | 1,482 | 89 | hvac, mechanical | Sep 2026 |
| 25 | ROSSOE ENERGY SYSTEMS INC | 1,427 | 57 | addition, electrical, hvac | Oct 2017 |
"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