Collaborative Construction LLC
1completed ADU permits
2total ADU permits
2016–2016active years on record
$541,687median est. project cost
Washington state license
- License
- COLLACL929QQ
- Status
- license re-licensed
- Type
- CONSTRUCTION CONTRACTOR
- Expires
- 2023-01-19
- Registered in
- SEATTLE, WA
As reported by WA L&I on 2026-08-30. Always re-verify at lni.wa.gov/verify.
Permit record
Every ADU-related permit in covered city records naming this contractor. Links go to each city's official permit portal.
| Permit | City | Issued | Status | Est. cost | Address | Description |
|---|---|---|---|---|---|---|
| 6498358-CN | 2016-10-05 | Issued | $541,687 | 607 18TH AVE S | Establish use as single family residence and construct one family dwelling with accessory dwelling unit per plans. | |
| 6498358-EX | — | Completed | — | 607 18TH AVE S | Exception/Exemption Request for: Establish use as single family residence and construct one family dwelling with accessory dwelling unit per plans. |
Is this your company? Claim this profile free to add your website, contact details, and corrections.
Or get featured — $99/mo, top placement above the rankings homeowners land on. How it works →