Home addition contractor in Seattle, WA

Seattle project planning

Plan home additions around the actual property.

Use Seattle's construction and inspection resources for city parcels. Before adding floor area or a separate dwelling, establish lot boundaries, access, utilities, and any additional site review that applies to the address.

Test the proposed footprint against the site before developing a detailed room plan. A larger room needs a practical foundation and roof connection, a workable utility strategy, and a construction sequence around the retained house.

• Parcel boundaries, existing improvements, and the buildable footprint
• Foundation, load paths, roof tie-in, and drainage
• Heating, electrical, plumbing, and energy-performance requirements
• Connections to retained rooms and temporary weather protection

Local review

Permitting and scope in Seattle

For Seattle, begin with Seattle Department of Construction and Inspections. Verify the property's jurisdiction and the scope before using a permit application or planning an inspection.

An addition needs a site-specific review of building and land-use requirements. Confirm survey, engineering, site, utility, and trade documentation with the appropriate agency before relying on a proposed area or setback.

Your first conversation

Bring the information that changes the plan.

Bring the intended room use, existing plans if available, a property survey if available, and alternatives you would consider if the footprint changes.

Include the Seattle property address or ZIP code, your preferred timing, and the investment range you are considering. Plans and surveys are helpful when available, but you can start the conversation without them.