Additions and square-footage expansions permitted in Seattle. These are the largest residential projects a homeowner undertakes and carry the highest declared values.
25 permits listed
$17,637,425 declared value
Seattle Open Data source
Live updated on load
Recent permits
7550 M L KING JR WAY S$2,000,000
LAND USE STATEMENT - Change of use from place of worship to medical clinic. Construct alterations and additions to convert a place of religious worship [ROSEHILL BAPTIST CHURCH] to medical clinic occupy per plan.
Filed 2026-08-12 · addition alteration · filed
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.
Filed 2026-07-31 · addition alteration · filed
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.
Filed 2026-07-29 · addition alteration · filed
3432 HARBOR AVE SW$836,000
Construct additions for concrete pad generator fencing and alterations to existing utility (King Co. DNS Sewer Treatment Regulator Station) per plan. Mechanical included this permit.
Issued 2026-09-16 · addition alteration · unknown
2325 38TH AVE E$800,000
Construct additions and substantial alterations to existing single family residence per plan.
Filed 2026-07-23 · addition alteration · unknown
824 32ND AVE S$725,000
Construct additions and alterations to existing one family dwelling per plan.
Filed 2026-08-27 · 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
2817 11TH AVE E$650,000
Allow housing for (1) new dwelling unit within an existing structure per land use code. Construct alterations and additions and convert one-family dwelling to two-family dwelling per plan.
Filed 2026-08-21 · addition alteration · unknown
2808 W GARFIELD ST$645,417
Construct substantial alterations and additions for one-family dwelling per plan.
Filed 2026-08-24 · addition alteration · unknown
3802 30TH AVE W$600,000
Additions and substantial alterations to existing one-family dwelling per plan.
Filed 2026-08-13 · addition alteration · filed
3731 E PROSPECT ST$600,000
Construct additions and alterations to existing one family dwelling per plan.
Filed 2026-08-27 · 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 a two story addition over basement and substantial alterations to a one-family dwelling per plans
Filed 2026-07-30 · 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 · filed
5833 57TH AVE NE$529,621
Construct substantial alterations and additions for one-family dwelling per plan.
Filed 2026-07-28 · 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 · unknown
1809 N 145TH ST$500,000
Allow housing for new attached dwelling unit within existing structure per land use code. Construct addition and substantial alterations for two family dwelling per plan.
Construct MIDDLE SFD per plan [Allow additional single family dwelling unit with detached accessory dwelling units per land use code. Construct as middle NW and NE single family dwellings (SFD); review and process f
Issued 2026-08-28 · new construction · issued
3029 NE 90TH ST$457,086
Construct substantial alterations and additions to existing one family dwelling per plan.
Filed 2026-08-07 · addition alteration · filed
12033 2ND AVE NE$450,000
Construct 2nd story addition and substantial alterations to one-family dwelling per plan.
Filed 2026-06-04 · 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 · unknown
3920 BROOKLYN AVE NE$438,000
Construct alterations and additions to parking lot (UW) at northwest corner of lot southwest corner of existing institutional building per plan.
Filed 2026-08-18 · addition alteration · unknown
4741 2ND AVE NE$400,000
Construct substantial alterations and additions for one-family dwelling per plan.
Filed 2026-06-21 · addition alteration · unknown
Need the full list, or another city?
This page shows a sample. The full live feed for one metro and trade is $99/mo, or $299/mo to hold the territory exclusively, See how it works →