Research Seattle contractors before you hire

Start with the property address and proposed work. Compare dated company research with the appropriate Washington credentials, permit agency and written scope. This guide links to evidence and company profiles without requiring a lead-capture form. Examples are not rankings or guarantees of availability.

Guide sources and live NHA profile links reviewed October 17, 2026. Company qualification dates below are separate. This review did not repeat those Google or BBB checks or independently verify individual licenses, registrations or insurance.

Public Health’s plumbing and gas-piping page explains the applicable permit process and links the Public Health Permit Center. It describes permits for installing, relocating or changing a system. Ask the agency about the actual repair or alteration rather than treating every plumbing visit as the same permit category.

King County’s inspection instructions distinguish a request from a scheduled inspection. A requested date is not confirmation that an inspection occurred or passed. Include scheduling responsibility, corrections and final records in the agreement, then check the official permit and inspection status. For electrical work, follow L&I’s jurisdiction guidance to the city that performs its own electrical permitting and inspection or to L&I where applicable.

Seattle’s Tree Service Provider Registry requirements were updated June 5, 2026. They distinguish private-property tree work regulated by SDCI from public right-of-way work regulated by SDOT. Those departments maintain separate provider requirements even though the directory search is combined.

Before agreeing to pruning, root work or removal, identify the tree’s location and ask the responsible department whether the provider registration, notice or permit requirements apply to that scope. The rules include definitions and exceptions: do not assume every pruning task follows the same process. A City provider listing does not replace the state registration check or authorize every type of tree work. NHA has not verified the current registry status of the example company.

Use L&I’s Hire Smart Step-by-Step as a homeowner research checklist. For plumbing-specific questions, use the Seattle plumbing research guide to compare business licensing, individual certification, local permit agencies and side-sewer scope. Compare written bids for equivalent work, clarify materials, permit responsibility, schedule, completion and warranty terms, and document changes before the added work proceeds. Ask who employs or subcontracts the people doing the work and verify applicable coverage rather than assuming every business has the same staffing structure.

For plumbing, separate diagnosis, access, repair and restoration. For electrical work, name the circuits, panel or service changes and required inspections. For tree care, define the pruning or removal objective, adjacent-property protection, equipment access, debris removal and stump work. A low price or high public rating does not answer these project-specific questions; no local cost estimate or outcome is promised here.