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What Are You Allowed to Build at 309 Holly Lane, Cosmopolis, WA, 98537?

Backyard Cottage

(Detached ADU)

Probably Not Allowed

This lot does not meet the requirements for a Detached ADU. A variance may be requested through your local zoning authority

In Home Apartment

(Conversion or Addition)

Might be Allowed

This property may qualify for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

Swimming Pool

Probably Not Allowed

This property likely does not meet the zoning requirements for a swimming pool. A variance or other zoning relief may be required. Final feasibility may depend on site-specific conditions and local interpretation.

Single Family

Probably Not Allowed

The existing home is allowed as a legally nonconforming structure. However, the lot does not meet current zoning requirements for new Single-Family construction. A variance or other zoning relief may be requested.

Multifamily

Home Addition

Probably Not Allowed

Our analysis indicates there is no remaining zoning capacity to expand this home. A home addition would likely require zoning relief.

Property facts

Zoning Jurisdiction

COSMOPOLIS

Parcel ID

034500103501

Property Type

Single Family

Zone

R-100

Year Built

1958

Lot Size

323 sq ft

Gross Building Area

109 sq ft

Gross Floor Area

1,053 sq ft

Estimated

Living Area

1,053 sq ft

Basement Area

0 sq ft

Impervious Surface

109 sq ft

Estimated

33.7%of lot coverage

ADU rules for Cosmopolis, WA

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