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What Are You Allowed to Build at 800 Harrison St, Seattle, WA, 98109?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

In Home Apartment

(Conversion or Addition)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

Swimming Pool

Probably Allowed
This property likely meets the zoning requirements to build a swimming pool. Based on applicable zoning limits, the estimated buildable area for a pool. Final feasibility may depend on site-specific conditions and local interpretation.

Single Family

Probably Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 32,400 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multi Family

Home Addition

Probably Allowed
We estimate you can expand this property by up to 25,383 sq ft under current zoning rules. This may allow for a horizontal addition, a vertical addition, or both, depending on design and permitting.

Property facts

Streetview picture of 800 Harrison St, Seattle, WA, 98109

Zoning Jurisdiction

SEATTLE

Parcel ID

1988201580

Property Type

Multi Family

Zone

SM-SLU

Year Built

1911

Lot Size

7,199 sq ft

Gross Building Area

8,580 sq ft

Gross Floor Area

7,016 sq ft

Estimated

Living Area

5,453 sq ft

Basement Area

0 sq ft

Impervious Surface

5,453 sq ft

Estimated
75.7%of lot coverage

ADU rules for Seattle, WA

Based on public data and AI. Check with a pro. Read More

© 2026 TheBuilder AI Inc. d/b/aFutureLot. All rights reserved.

What Are You Allowed to Build at 800 Harrison St, Seattle, WA, 98109?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

In Home Apartment

(Conversion or Addition)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

Swimming Pool

Probably Allowed
This property likely meets the zoning requirements to build a swimming pool. Based on applicable zoning limits, the estimated buildable area for a pool. Final feasibility may depend on site-specific conditions and local interpretation.

Single Family

Probably Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 32,400 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multi Family

Home Addition

Probably Allowed
We estimate you can expand this property by up to 25,383 sq ft under current zoning rules. This may allow for a horizontal addition, a vertical addition, or both, depending on design and permitting.

Property facts

Streetview picture of 800 Harrison St, Seattle, WA, 98109

Zoning Jurisdiction

SEATTLE

Parcel ID

1988201580

Property Type

Multi Family

Zone

SM-SLU

Year Built

1911

Lot Size

7,199 sq ft

Gross Building Area

8,580 sq ft

Gross Floor Area

7,016 sq ft

Estimated

Living Area

5,453 sq ft

Basement Area

0 sq ft

Impervious Surface

5,453 sq ft

Estimated
75.7%of lot coverage

ADU rules for Seattle, WA

Based on public data and AI. Check with a pro. Read More

© 2026 TheBuilder AI Inc. d/b/aFutureLot. All rights reserved.