Convert existing basement into a code-compliant ADU with new entrances
Alteration or repair at 21 Monsignor Patrick J. Lydon Wy, Boston
Boston Inspectional Services Department permit ALT1860531: issued Sep 10, 2026 for alteration or repair work at 21 Monsignor Patrick J. Lydon Wy. Convert existing basement into a code-compliant ADU with new entrances, egress windows, framing, insulation, drywall, full bathroom and kitchen finishes, tile flooring, trim, painting, interior carpentry upgrades.
- Permit number
- ALT1860531
- Issued
- Type of work
- Alteration or repair
- Status
- Issued
- Reported cost
- $109,850
- ZIP code
- 02124
- City's category
- Change Occupancy, Long Form/Alteration Permit
- City's status
- Open
- Source
- Boston Inspectional Services Department 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 21 Monsignor Patrick J. Lydon Wy, and what's permitted nearby
Boston Inspectional Services Department updated its data Oct 4, 2026. We checked it Oct 5, 17:30 UTC. See the city's official records.
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