Additions and square-footage expansions permitted in Seattle. These are the largest residential projects a homeowner undertakes and carry the highest declared values.
16permits listed
$7,994,369declared value
Seattle Open Datasource
Liveupdated on load
Recent permits
4040 7TH AVE NE$1,250,000
Allow one additional unit in multifamily housing per land use code. Construct as alterations for fitness and bike storage alterations and addition to existing apartment building (Gillman Apts.) and occupy per plan.
Construct substantial alterations and addition to existing one family dwelling per plan.
Filed 2026-07-08 · addition alteration · unknown
3020 W GARFIELD ST$653,945
Allow an attached dwelling unit per the land use code. Construct additions and substantial alterations for a two-family dwelling per plans.
Filed 2026-07-22 · addition alteration · filed
1124 17TH AVE E$600,000
Allow housing for one new attached dwelling unit at an existing structure per land use code. Construct addition and substantial alterations for a two-family dwelling per plan.
Filed 2026-06-12 · addition alteration · unknown
3232 57TH AVE SW$600,000
Construct 2nd story addition and substantial alterations to one-family dwelling per plan.
Filed 2026-07-30 · addition alteration · filed
4833 NE 45TH ST$508,290
Allow housing for one new stacked dwelling unit at an existing structure per land use code. Construct addition & substantial alterations to convert one-family dwelling into two-family dwelling per plan
Filed 2026-07-15 · addition alteration · filed
4741 2ND AVE NE$400,000
Construct substantial alterations and additions for one-family dwelling per plan.
Filed 2026-06-21 · addition alteration · unknown
601 W COMSTOCK ST$400,000
Allow housing for one new stacked dwelling unit within an existing structure per land use code. Construct addition and substantial alterations for a two-family dwelling per plan.
Filed 2026-07-28 · addition alteration · filed
4057 49TH AVE SW$387,109
Construct additions and substantial alterations to existing one-family dwelling per plan.
Filed 2026-04-14 · addition alteration · unknown
7016 13TH AVE NW$378,620
Construct EAST one-family dwelling per plan. [LAND USE DESCRIPTION. Construct one-family dwelling and substantial alterations and additions to convert existing one-family dwelling to two-family dwelling per plan. Revie
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