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What Are You Allowed to Build at 28 William St, Greenwich, CT, 06830?

Backyard Cottage

(Detached ADU)

Might be Allowed
This property may qualify for a Detached ADU of up to 869 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

In Home Apartment

(Conversion or Addition)

Might be Allowed
This property may qualify for an Internal ADU of up to 306 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
This lot does not meet the zoning requirements to build a Single-Family home. A variance may be requested through your local zoning authority

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 869 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 28 William St, Greenwich, CT, 06830

Zoning Jurisdiction

GREENWICH

Parcel ID

074078S

Property Type

Residential

Zone

R-MF

Year Built

1900

Lot Size

2,700 sq ft

Gross Building Area

875 sq ft

Gross Floor Area

751 sq ft

Estimated

Living Area

627 sq ft

Basement Area

0 sq ft

Impervious Surface

627 sq ft

Estimated
23.2%of lot coverage

ADU rules for Greenwich, CT

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 28 William St, Greenwich, CT, 06830?

Backyard Cottage

(Detached ADU)

Might be Allowed
This property may qualify for a Detached ADU of up to 869 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

In Home Apartment

(Conversion or Addition)

Might be Allowed
This property may qualify for an Internal ADU of up to 306 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
This lot does not meet the zoning requirements to build a Single-Family home. A variance may be requested through your local zoning authority

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 869 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 28 William St, Greenwich, CT, 06830

Zoning Jurisdiction

GREENWICH

Parcel ID

074078S

Property Type

Residential

Zone

R-MF

Year Built

1900

Lot Size

2,700 sq ft

Gross Building Area

875 sq ft

Gross Floor Area

751 sq ft

Estimated

Living Area

627 sq ft

Basement Area

0 sq ft

Impervious Surface

627 sq ft

Estimated
23.2%of lot coverage

ADU rules for Greenwich, CT

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

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