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What Are You Allowed to Build at 345 Washington St, Quincy, MA, 02169?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 900 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 900 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 4,041 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 276 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 345 Washington St, Quincy, MA, 02169

Zoning Jurisdiction

QUINCY

Parcel ID

20452

Property Type

Single Family

Zone

RB

Year Built

1900

Lot Size

10,101 sq ft

Gross Building Area

1,660 sq ft

Gross Floor Area

3,765 sq ft

Estimated

Living Area

3,765 sq ft

Basement Area

0 sq ft

Impervious Surface

1,660 sq ft

Estimated
16.4%of lot coverage

ADU rules for Quincy, 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 345 Washington St, Quincy, MA, 02169?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 900 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 900 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 4,041 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 276 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 345 Washington St, Quincy, MA, 02169

Zoning Jurisdiction

QUINCY

Parcel ID

20452

Property Type

Single Family

Zone

RB

Year Built

1900

Lot Size

10,101 sq ft

Gross Building Area

1,660 sq ft

Gross Floor Area

3,765 sq ft

Estimated

Living Area

3,765 sq ft

Basement Area

0 sq ft

Impervious Surface

1,660 sq ft

Estimated
16.4%of lot coverage

ADU rules for Quincy, MA

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

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