The project converts the existing unfinished attic into a 1,039 sq ft new habitable third-floor space within
Addition at 12 Leonard St, Somerville
Somerville Inspectional Services Division permit B25-001892: issued Jan 21, 2026 for addition work at 12 Leonard St. The project converts the existing unfinished attic into a 1,039 sq ft new habitable third-floor space within a newly constructed mansard roof. The new level will include: â One Bedroom with a Walk-In Closet â One Full Bathroom â One Family Room â One Office â One Mechanical Room New windows will be installed at the mansard level to meet egress, energy, and natural light/ventilation requirements.
- Permit number
- B25-001892
- Issued
- Type of work
- Addition
- Status
- Issued
- Reported cost
- $200,000
- ZIP code
- 02144
- City's category
- Building Permit, Residential Addition
- City's status
- Issued
- Source
- Somerville Inspectional Services Division permit data (this record)
Type of work and status are our own standard labels, so permits compare across cities. The city's wording is in the "City's category" and "City's status" rows. We show costs under $100 as not listed, because filers often enter $0 or $1 when the city doesn't require a cost.
All permits at 12 Leonard St, and what's permitted nearby
Somerville Inspectional Services Division updated its data Oct 9, 2026. We checked it Oct 9, 19:59 UTC. See the city's official records (SomerStat, City of Somerville, ODbL 1.0).
Contains information from Applications for Permits and Licenses (SomerStat, City of Somerville), which is made available here under the Open Database License (ODbL).
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