# Alteration or repair permit ALT1814542 at 91 Walter St, Boston

Boston Inspectional Services Department permit ALT1814542: issued Oct 16, 2026 for alteration or repair work at 91 Walter St. To create an internal ADU by splitting 3rd floor from the 2nd floor unit from which it is currently combined with in an existing 2 family home. There will be no additions or changes to the building envelope, and the unit will be sprinkled per code and meet all requirements.

- Permit number: ALT1814542
- Issued: Oct 16, 2026
- Type of work: Alteration or repair (city: Change Occupancy, Long Form/Alteration Permit)
- Status: Issued (city: Open)
- Reported cost: $30,000
- ZIP code: 02131
- All permits at this address: https://nearbypermits.com/boston/address/91-walter-st/

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-18 05:30 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 91 Walter St: https://nearbypermits.com/boston/address/91-walter-st/