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What Are You Allowed to Build at 15 Brown St Unit 405, Portland, ME, 04101?

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 3,754 sq ft allowed By Right, or possibly more by Special Permit.

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 under current zoning rules. We weren't able to identify a specific size limit, but an addition may be possible horizontally, vertically, or both, depending on design and permitting.

Property facts

Streetview picture of 15 Brown St Unit 405, Portland, ME, 04101

Zoning Jurisdiction

PORTLAND

Parcel ID

037I002405

Property Type

Residential

Zone

B-3

Year Built

1870

Lot Size

10,698 sq ft

Gross Building Area

10,083 sq ft

Gross Floor Area

5,631 sq ft

Estimated

Living Area

1,180 sq ft

Basement Area

0 sq ft

Impervious Surface

10,083 sq ft

Estimated
94.2%of lot coverage

ADU rules for Portland, ME

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 15 Brown St Unit 405, Portland, ME, 04101?

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 3,754 sq ft allowed By Right, or possibly more by Special Permit.

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 under current zoning rules. We weren't able to identify a specific size limit, but an addition may be possible horizontally, vertically, or both, depending on design and permitting.

Property facts

Streetview picture of 15 Brown St Unit 405, Portland, ME, 04101

Zoning Jurisdiction

PORTLAND

Parcel ID

037I002405

Property Type

Residential

Zone

B-3

Year Built

1870

Lot Size

10,698 sq ft

Gross Building Area

10,083 sq ft

Gross Floor Area

5,631 sq ft

Estimated

Living Area

1,180 sq ft

Basement Area

0 sq ft

Impervious Surface

10,083 sq ft

Estimated
94.2%of lot coverage

ADU rules for Portland, ME

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

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