Are there building permits at 21 Mercer St, Boston?

21 Mercer St has 10 municipal building permits on record, with the latest activity dated Jul 19, 2025.

What construction activity is near 21 Mercer St?

2 mapped permits were found within 500 m of 21 Mercer St.

What is the declared permit value at 21 Mercer St?

Permits recorded at 21 Mercer St represent $10K–$50K in total declared construction value.

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PropertyLabsBostonAddress intelligence

21 Mercer St

Building permit intelligence · Boston, MA

10 at this address2 nearby within 500 m

21 Mercer St has 10 municipal building permits on file in Ward 18. The latest recorded activity was a insul permit dated Jul 19, 2025. Permits at this address represent $10K–$50K in total declared construction value. PropertyLabs also identified 2 mapped permits within 500 m of this address.

At this address: 10
Nearby (500 m): 2
Latest activity: Jul 19, 2025
Total permitted value: $10K–$50K

Permit activity timeline

INSUL · 1-2FAMOpenValue not reportedJul 19, 2025
Insulation
Short Form Bldg Permit · SIDEOpen$10K–$50KApr 7, 2022
Install 3/8" foam board insulation. Install double 4" vinyl siding to home. Cover all trim fascia and soffit. Install seamless gutters and downspouts.
Gas Permit · GASClosedUnder $10KDec 2, 2019
Install Gas Boiler
Plumbing Permit · PLUMBINGOpenUnder $10KDec 2, 2019
Install Gas Boiler
Plumbing Permit · PLUMBINGOpenUnder $10KMar 22, 2018
remove bathtub and sink, Installing french drain to basement, reinstall tub & sink
Short Form Bldg Permit · INTRENOpenUnder $10K

Development activity near 21 Mercer St

2 mapped permits within 500 m, shown on the intelligence map above.

Browse recent permits near this address

More permits on Mercer St

12 other addresses on Mercer St with municipal permit records in Boston.

All Mercer St permits

21 Mercer St in the Boston permit market

This address has 10 permit records in PropertyLabs' public history and is located in Ward 18. The city figures below provide context without changing the focus of this exact-address record.

Explore Boston building permits

City address-linked rows: 658,435
City, trailing 90 days: 0
City, trailing 30 days: 0

City coverage counts address-linked rows and does not add overlapping canonical tables. Rolling windows are inclusive, use UTC boundaries, and end Aug 2, 2026.

Permit questions about 21 Mercer St

Are there building permits at this address?: 21 Mercer St has 10 municipal building permits on record, with the latest activity dated Jul 19, 2025.
What construction activity is nearby?: 2 mapped permits were found within 500 m of 21 Mercer St.
What is the declared permit value?: Permits recorded at 21 Mercer St represent $10K–$50K in total declared construction value.

About this address record

PropertyLabs compiled this permit history from municipal public records for Boston, MA. The latest recorded permit activity at 21 Mercer St is dated Jul 19, 2025. Municipal records can be corrected or updated after publication.

Sources and data notes

Published by Boston, MA via Boston Open Data.
Municipal sources remain authoritative for permit status and details.
Coverage context: PropertyLabs Coverage Observatory and the permit-data methodology.
Address research workflow: how to check building permits for an address.
City research: Boston Building Permit Activity Through July 19, 2026.
Declared values may be applicant-reported and are not independently verified. See what declared construction value means.
Permit issuance does not confirm that construction has started.
Records may be delayed, revised, or incomplete relative to the municipal source.
Spot an error? Contact us with a correction.

Contractors and applicants associated with these permits

See the contractors, applicants, permit holders, permit numbers, and project documents associated with 21 Mercer St in the PropertyLabs platform, along with alerts when new permits are filed at this address.

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