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
$8,703,021declared value
Seattle Open Datasource
Liveupdated on load
Recent permits
946 BROADWAY E$1,053,949
Allow housing for four new stacked dwelling units within an existing structure per land use code. Construct addition and substantial alterations for a multifamily building occupy per plan. Project includes removal of a
Filed 2026-06-03 · addition alteration · unknown
932 18TH AVE E$1,000,000
Construct substantial alterations and addition to existing one family dwelling per plan.
Filed 2026-07-08 · addition alteration · unknown
13758 LAKE CITY WAY NE$850,000
Construct substantial alterations and addition to existing commercial building occupy per plan. Mechanical included.
Construct additions and alterations to existing single family residence per plan.
Filed 2026-07-23 · addition alteration · filed
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
1834 6TH AVE W$600,000
Construct substantial alterations and additions to establish four dwelling units in an existing apartment building occupy per plan.
Filed 2026-04-17 · addition alteration · filed
1722 4TH AVE N$560,475
Construct substantial alterations and additions to existing one-family dwelling per plan
Filed 2026-06-10 · addition alteration · unknown
7332 9TH AVE NW$439,200
Construct addition and substantial alterations to existing one-family dwelling per plan.
Filed 2026-06-03 · addition alteration · filed
4711 BEACH DR SW$369,743
Construct substantial alterations and additions to existing one family dwelling per plan.
Filed 2026-07-06 · addition alteration · filed
1425 27TH AVE$300,000
Construct addition and alterations to West one-family dwelling per plan. (Convert existing DADU to plain old one-family dwelling per land use code. Construct alterations to both West and East existing one-family dwelli
Filed 2026-05-14 · addition alteration · unknown
9116 1ST AVE NE$300,000
Construct substantial alterations and additions to one-family dwelling per plan.
Filed 2026-07-08 · addition alteration · unknown
3221 NE 89TH ST$300,000
Construct addition & substantial alterations to one-family dwelling per plan
Filed 2026-07-14 · addition alteration · filed
5109 2ND AVE NW$300,000
Construct addition and substantial alterations to a one-family dwelling per plans
Filed 2026-07-16 · addition alteration · filed
2618 S DELAPPE PL$300,000
Construct substantial alterations to repair and replace fire-damaged portions of one-family dwelling per plan. Additions to upper level included.
Filed 2026-07-27 · addition alteration · filed
3042 18TH AVE S$275,709
Allow an attached housing unit to be added to an existing unit per the land use code. Construct alterations throughout and addition for a two-family dwelling per plans
Filed 2026-06-25 · addition alteration · unknown
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