# Building permits at 21 Plainfield St, Boston, MA

The biggest project within a quarter mile since May 1: a $300,000 alteration or repair at 117 Williams St, permitted Aug 13.

Four permits on record here. The newest, Apr 29: Installation and wiring of ductless system consisting of one condenser and five mini split heads. Within a quarter mile, the city has issued 32 more permits (29 projects) since May 1. One is for a new building, 0.22 mi away.

## At this address

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| Apr 29, 2026 | Alteration or repair | Installation and wiring of ductless system consisting of one condenser and five mini split heads | $14,996 | [SF1822954](https://nearbypermits.com/boston/permit/SF1822954/) |
| Apr 29, 2026 | Electrical | Installation and wiring of ductless system consisting of one condenser and five mini split heads | $4,999 | [E1822955](https://nearbypermits.com/boston/permit/E1822955/) |
| Nov 3, 2020 | Alteration or repair | Air Sealing Attic blow in dense pack cellulose to achieve R-38 Blow in dense Pack Cellulose Inside Walls | $16,562 | [SF1130937](https://nearbypermits.com/boston/permit/SF1130937/) |
| Sep 9, 2013 | Alteration or repair | Bathroom remodel, demo, new fixtures, blueboard and plaster, tile | $19,300 | [SF284010](https://nearbypermits.com/boston/permit/SF284010/) |

## Within ¼ mi since May 1, 2026

32 permits in the circle. From our copy of the city's data (last 24 months).

### Next door (under 250 ft), 3 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Jul 9, 2026 | [49-51 Rossmore Rd](https://nearbypermits.com/boston/address/49--51-rossmore-rd/) | 140 ft N | Plumbing | Install 40 gallon gas water heater, unit 2 | $500 | [PL1869809](https://nearbypermits.com/boston/permit/PL1869809/) |
| Jul 9, 2026 | [49-51 Rossmore Rd](https://nearbypermits.com/boston/address/49--51-rossmore-rd/) | 140 ft N | Plumbing | Install 40 gallon gas water heater, unit 2 | $500 | [G1869811](https://nearbypermits.com/boston/permit/G1869811/) |
| May 21, 2026 | [16-20 Plainfield St](https://nearbypermits.com/boston/address/16--20-plainfield-st/) | 130 ft E | Electrical | Replace meter due to corrosion. | $10,000 | [E1851949](https://nearbypermits.com/boston/permit/E1851949/) |

### This block (250 to 1,000 ft), 26 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | [3510 Washington St](https://nearbypermits.com/boston/address/3510-washington-st/) | 760 ft N | Fire systems | This amendment changes the licensed professional designer for fire alarm installation and inspection for Permit Number ALT1462358. The design remains the same as the previous design. The New Subcontractor company name is Priority 7 Alarm Systems LLC.Provide a common access to the sprinkler room.; | $25,000 | [A1901113](https://nearbypermits.com/boston/permit/A1901113/) |
| Sep 28, 2026 | [152 Williams St](https://nearbypermits.com/boston/address/152-williams-st/) | 660 ft E | Plumbing | New install water heater (second one at this location) | $500 | [PL1904100](https://nearbypermits.com/boston/permit/PL1904100/) |
| Sep 28, 2026 | [152 Williams St](https://nearbypermits.com/boston/address/152-williams-st/) | 660 ft E | Plumbing | New water heater installation | $500 | [PL1904092](https://nearbypermits.com/boston/permit/PL1904092/) |
| Sep 28, 2026 | [152 Williams St](https://nearbypermits.com/boston/address/152-williams-st/) | 660 ft E | Plumbing | New water heater installation | $500 | [G1904086](https://nearbypermits.com/boston/permit/G1904086/) |
| Sep 28, 2026 | [152 Williams St](https://nearbypermits.com/boston/address/152-williams-st/) | 660 ft E | Plumbing | New install water heater (second at this location) | $500 | [G1904104](https://nearbypermits.com/boston/permit/G1904104/) |
| Sep 25, 2026 | [155 Williams St](https://nearbypermits.com/boston/address/155-williams-st/) | 660 ft E | Electrical | Replacement of the electrical panel for safety reason, and inspection of all outlets and lights in the apartment to restore electrical service. which had been cut off a year ago due to non-payment. | $500 | [E1904507](https://nearbypermits.com/boston/permit/E1904507/) |
| Sep 17, 2026 | [90-92 Rossmore Rd](https://nearbypermits.com/boston/address/90--92-rossmore-rd/) | 460 ft E | Alteration or repair | Front deck replacement: demolish existing deck, new composite decking, rebuild knee wall in lieu of railings with paint finish, and replace one window seal/casing | $19,120 | [SF1901997](https://nearbypermits.com/boston/permit/SF1901997/) |
| Sep 9, 2026 | [63-65 Brookley Rd](https://nearbypermits.com/boston/address/63--65-brookley-rd/) | 260 ft S | Roofing | Rubber Roof Replacement | $29,899 | [SF1896635](https://nearbypermits.com/boston/permit/SF1896635/) |
| Sep 9, 2026 | [74 Williams St](https://nearbypermits.com/boston/address/74-williams-st/) | 620 ft N | Electrical | Air source heat pump system connections to (1) condenser and (1) air handler suspended from ceiling above washing machine, work for 2nd Floor unit only. | $12,000 | [E1884019](https://nearbypermits.com/boston/permit/E1884019/) |
| Sep 3, 2026 | [117 Williams St](https://nearbypermits.com/boston/address/117-williams-st/) | 390 ft NE | Plumbing | Kitchen and bathroom remodel | $15,000 | [PL1895983](https://nearbypermits.com/boston/permit/PL1895983/) |
| Aug 18, 2026 | [131-133 Williams St](https://nearbypermits.com/boston/address/131--133-williams-st/) | 460 ft E | Plumbing | 1st Floor Bathroom - Replace shower stall, no structural change. (Other is a valve) | $1,500 | [PL1888643](https://nearbypermits.com/boston/permit/PL1888643/) |
| Aug 13, 2026 | [117 Williams St](https://nearbypermits.com/boston/address/117-williams-st/) | 390 ft NE | Alteration or repair | plumbing, electrical, siding, kitchen renovation, bathroom renovations, deck repairs | $300,000 | [SF1887546](https://nearbypermits.com/boston/permit/SF1887546/) |
| Aug 7, 2026 | [84-86 Brookley Rd](https://nearbypermits.com/boston/address/84--86-brookley-rd/) | 400 ft SE | Electrical | Install new exterior fixtures at front and back porches | $3,600 | [E1883333](https://nearbypermits.com/boston/permit/E1883333/) |
| Aug 5, 2026 | [103-105 Rossmore Rd](https://nearbypermits.com/boston/address/103--105-rossmore-rd/) | 570 ft SE | Roofing | Strip rubber roof of all rubber related products and isntall 2" polyiso insulation.060 fully adhered rubber roofing.032 drip edge, terminate/flash as required | $33,250 | [SF1880036](https://nearbypermits.com/boston/permit/SF1880036/) |
| Jul 31, 2026 | [75 Rossmore Rd](https://nearbypermits.com/boston/address/75-rossmore-rd/) | 270 ft E | Alteration or repair | Residential weatherization and air sealing with the Mass Save Program. No structural changes. | $3,142 | [SF1877289](https://nearbypermits.com/boston/permit/SF1877289/) |
| Jul 1, 2026 | [3531-3541 Washington St](https://nearbypermits.com/boston/address/3531--3541-washington-st/) | 760 ft NW | Other | Install one (1) single sided banner. 36" H x 120" W. Flush mount to wall over main entrance. Installed for 30 days and then to be removed | $475 | [SF1867184](https://nearbypermits.com/boston/permit/SF1867184/) |
| May 28, 2026 | [16a Meehan St](https://nearbypermits.com/boston/address/16a-meehan-st/) | 510 ft N | Electrical | Replace wiring for storage unit receptacles. Replace All devices in storage units. Replace Breakers for storage units to Dual function type. Replace devices controlling sump pump. Meg test Switch legs and homeruns to Storage units. | $4,500 | [E1853760](https://nearbypermits.com/boston/permit/E1853760/) |
| May 22, 2026 | [16a Meehan St](https://nearbypermits.com/boston/address/16a-meehan-st/) | 510 ft N | Alteration or repair | Interior repairs due to water damage in Condominium Common Area. Replace affected drywall up to 4ft high from floor in entire basement space. Replace. Replace finish flooring, trim and paint. | $57,319 | [SF1852170](https://nearbypermits.com/boston/permit/SF1852170/) |
| May 20, 2026 | [97 Williams St](https://nearbypermits.com/boston/address/97-williams-st/) | 450 ft N | Plumbing | Gas stove, 3rd floor | $800 | [G1851412](https://nearbypermits.com/boston/permit/G1851412/) |
| May 20, 2026 | [71a Williams St](https://nearbypermits.com/boston/address/71a-williams-st/) | 650 ft N | Electrical | New house, 3 story, unit in basement | $65,000 | [E1846881](https://nearbypermits.com/boston/permit/E1846881/) |
| May 13, 2026 | [3484 Washington St](https://nearbypermits.com/boston/address/3484-washington-st/) | 980 ft N | Electrical | Install a new 100 amp three face underground, temporary service inside the building in order to service the elevator and car lift installations | $850 | [ETS1849059](https://nearbypermits.com/boston/permit/ETS1849059/) |
| May 11, 2026 | [71 Williams St](https://nearbypermits.com/boston/address/71-williams-st/) | 620 ft N | Plumbing | install new fixtures. | $25,000 | [PL1847135](https://nearbypermits.com/boston/permit/PL1847135/) |
| May 7, 2026 | [84-86 Brookley Rd](https://nearbypermits.com/boston/address/84--86-brookley-rd/) | 400 ft SE | Plumbing | Remodel of 2nd & 3rd floor bathrooms. | $4,000 | [PL1846571](https://nearbypermits.com/boston/permit/PL1846571/) |
| May 6, 2026 | [24-28 Gartland St](https://nearbypermits.com/boston/address/24--28-gartland-st/) | 870 ft N | Plumbing | Boiler replacement, work in 28 Gartland St only. | $7,500 | [PL1843474](https://nearbypermits.com/boston/permit/PL1843474/) |
| May 6, 2026 | [24-28 Gartland St](https://nearbypermits.com/boston/address/24--28-gartland-st/) | 870 ft N | Plumbing | Boiler replacement, work in 28 Gartland St only. | $7,000 | [G1843470](https://nearbypermits.com/boston/permit/G1843470/) |
| May 4, 2026 | [71a Williams St](https://nearbypermits.com/boston/address/71a-williams-st/) | 650 ft N | Fire systems | Install new fire alarm system | $10,000 | [EFA1845510](https://nearbypermits.com/boston/permit/EFA1845510/) |

### Farther (1,000 ft to ¼ mi), 3 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Sep 21, 2026 | [144 Mcbride St](https://nearbypermits.com/boston/address/144-mcbride-st/) | 0.20 mi NW | Electrical | City of boston event requiring generator | $500 | [ETS1902609](https://nearbypermits.com/boston/permit/ETS1902609/) |
| Jul 16, 2026 | [3458 Washington St](https://nearbypermits.com/boston/address/3458-washington-st/) | 0.22 mi N | New building | Erect new five-story mixed-use building to contain 36 dwelling units and ground-floor local retail business space, and residential amenity space, including bicycle storage room, with seven exterior accessory residential parking spaces at grade.*Clarification: Combine parcel# 1102856000 with vacant p | Not listed | [ERT1682848](https://nearbypermits.com/boston/permit/ERT1682848/) |
| Jul 9, 2026 | [3458 Washington St](https://nearbypermits.com/boston/address/3458-washington-st/) | 0.22 mi N | Alteration or repair | Foundation only permit.*See ERT of record for already stamped and approved permitted drawings for this project/FD- 7.7.2026 Costs low | Not listed | [FND1869084](https://nearbypermits.com/boston/permit/FND1869084/) |

## More on this street

Other addresses on Plainfield St with permits, nearest house number first:

- [16-20 Plainfield St](https://nearbypermits.com/boston/address/16--20-plainfield-st/): newest permit May 21, 2026
- [9 Plainfield St](https://nearbypermits.com/boston/address/9-plainfield-st/): newest permit Jun 6, 2025

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-08 10:09 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Map, all 4 permits at this address and 32 nearby: https://nearbypermits.com/boston/address/21-plainfield-st/