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What Are You Allowed to Build at 21 Brighton St, Boston, MA, 02129?

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)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,035 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 5,553 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 4,173 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 21 Brighton St, Boston, MA, 02129

Zoning Jurisdiction

BOSTON

Parcel ID

0202021000

Property Type

Single Family

Zone

Art62_3F-2000

Year Built

1880

Lot Size

2,776 sq ft

Gross Building Area

716 sq ft

Gross Floor Area

1,380 sq ft

Estimated

Living Area

1,380 sq ft

Basement Area

0 sq ft

Impervious Surface

716 sq ft

Estimated
25.8%of lot coverage

ADU rules for Boston, MA

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 21 Brighton St, Boston, MA, 02129?

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)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,035 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 5,553 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 4,173 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 21 Brighton St, Boston, MA, 02129

Zoning Jurisdiction

BOSTON

Parcel ID

0202021000

Property Type

Single Family

Zone

Art62_3F-2000

Year Built

1880

Lot Size

2,776 sq ft

Gross Building Area

716 sq ft

Gross Floor Area

1,380 sq ft

Estimated

Living Area

1,380 sq ft

Basement Area

0 sq ft

Impervious Surface

716 sq ft

Estimated
25.8%of lot coverage

ADU rules for Boston, MA

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

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