# Building permits at 18 Mayfair St, Boston, MA

The biggest project within a quarter mile since May 1: an $860,808 alteration or repair at 56-86 Codman Pk, permitted Jul 14.

Six permits on record here. The newest, Oct 1, 2025: Replace and relocate service and meter sockets. Within a quarter mile, the city has issued 63 more permits (60 projects) since May 1.

## At this address

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| Oct 1, 2025 | Electrical | replace and relocate service and meter sockets. | $3,500 | [E1784102](https://nearbypermits.com/boston/permit/E1784102/) |
| Sep 18, 2025 | Solar | roof mounted solar array of 13 panels @ 5.33 kW/DC | $22,064 | [SF1748405](https://nearbypermits.com/boston/permit/SF1748405/) |
| Aug 14, 2025 | Solar | roof mounted solar array of 13 panels @ 5.33 kW/DC | $16,784 | [E1748427](https://nearbypermits.com/boston/permit/E1748427/) |
| Jun 19, 2018 | Plumbing | gas re test gas company shut off | $150 | [G845264](https://nearbypermits.com/boston/permit/G845264/) |
| May 8, 2015 | Plumbing | Replace a steam boiler | $500 | [PL464019](https://nearbypermits.com/boston/permit/PL464019/) |
| May 8, 2015 | Plumbing | replace gas steam boiler 175K btu | $8,500 | [G464021](https://nearbypermits.com/boston/permit/G464021/) |

## Within ¼ mi since May 1, 2026

63 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 |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | [205 Walnut Av](https://nearbypermits.com/boston/address/205-walnut-av/) | 220 ft SE | Alteration or repair | Blown in cellulose insulation at exterior walls, air sealing and weatherization. | $8,446 | [SF1905575](https://nearbypermits.com/boston/permit/SF1905575/) |
| Sep 11, 2026 | [205 Walnut Av](https://nearbypermits.com/boston/address/205-walnut-av/) | 220 ft SE | Alteration or repair | we are insulating the walls with cellulose insulation and insulating the rim joist with r-19 fiberglass | $6,170 | [SF1897702](https://nearbypermits.com/boston/permit/SF1897702/) |
| Jul 22, 2026 | [205 Walnut Av](https://nearbypermits.com/boston/address/205-walnut-av/) | 220 ft SE | Alteration or repair | Residential weatherization/air sealing. No structural changes. (Site ID-1716860549) (Unit-1) | $1,000 | [SF1864746](https://nearbypermits.com/boston/permit/SF1864746/) |

### This block (250 to 1,000 ft), 29 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Sep 29, 2026 | [2850 Washington St](https://nearbypermits.com/boston/address/2850-washington-st/) | 710 ft W | Solar | Rooftop solar 21 panels 8.61 kwdc no ESS | $42,735 | [E1904830](https://nearbypermits.com/boston/permit/E1904830/) |
| Sep 25, 2026 | [247 Walnut Av](https://nearbypermits.com/boston/address/247-walnut-av/) | 780 ft S | Electrical | Replace jaws in meter for Eversource AMI project | $2,000 | [E1891726](https://nearbypermits.com/boston/permit/E1891726/) |
| Sep 21, 2026 | [7 Harold Pk](https://nearbypermits.com/boston/address/7-harold-pk/) | 660 ft SE | Alteration or repair | Scrape old siding and install new hardie plank siding, install new asphalt roof shingles, new windows, repair back porche, install new florring, new doors, kitchen and bathroom and interior paint, | $350,000 | [SF1900603](https://nearbypermits.com/boston/permit/SF1900603/) |
| Sep 16, 2026 | [76 Munroe St](https://nearbypermits.com/boston/address/76-munroe-st/) | 990 ft SE | Plumbing | gas combi boiler install | $7,500 | [PL1901476](https://nearbypermits.com/boston/permit/PL1901476/) |
| Sep 16, 2026 | [76 Munroe St](https://nearbypermits.com/boston/address/76-munroe-st/) | 990 ft SE | Plumbing | gas combi boiler install | $7,500 | [G1901471](https://nearbypermits.com/boston/permit/G1901471/) |
| Sep 16, 2026 | [12-26 Crestwood Pk](https://nearbypermits.com/boston/address/12--26-crestwood-pk/) | 840 ft SE | Plumbing | #12 only - (2) boiler swaps + (1) DHW swap | $15,000 | [PL1901330](https://nearbypermits.com/boston/permit/PL1901330/) |
| Sep 16, 2026 | [12-26 Crestwood Pk](https://nearbypermits.com/boston/address/12--26-crestwood-pk/) | 840 ft SE | Plumbing | #12 only - (2) boiler swaps + (1) DHW swap. | $15,000 | [G1901325](https://nearbypermits.com/boston/permit/G1901325/) |
| Sep 10, 2026 | [28-38 Crestwood Pk](https://nearbypermits.com/boston/address/28--38-crestwood-pk/) | 980 ft SE | Plumbing | #38 Only - Remove (2) existing boilers + (1) water heater and install (2) new heating boilers + (1) indirect water heater. | $14,000 | [PL1899781](https://nearbypermits.com/boston/permit/PL1899781/) |
| Sep 10, 2026 | [28-38 Crestwood Pk](https://nearbypermits.com/boston/address/28--38-crestwood-pk/) | 980 ft SE | Plumbing | Remove (2) existing boilers + (1) water heater and install (2) new heating boilers + (1) indirect water heater. | $14,000 | [G1899775](https://nearbypermits.com/boston/permit/G1899775/) |
| Sep 8, 2026 | [107 Munroe St](https://nearbypermits.com/boston/address/107-munroe-st/) | 360 ft SE | Electrical | half bathroom | $2,000 | [E1896394](https://nearbypermits.com/boston/permit/E1896394/) |
| Aug 25, 2026 | [107 Munroe St](https://nearbypermits.com/boston/address/107-munroe-st/) | 360 ft SE | Plumbing | New plumbing for a half bathroom. | $5,000 | [PL1891876](https://nearbypermits.com/boston/permit/PL1891876/) |
| Aug 18, 2026 | [2775 Washington St](https://nearbypermits.com/boston/address/2775-washington-st/) | 850 ft NW | Grading | Complete two 2.25" diameter soil borings to a depth of 10 feet. An additional 15 soil samples will be taken from across the property at a depth of 5' below the ground. This work is an extension of the work performed under Permit SF1837680. This is a vacant property. | $5,150 | [SF1878880](https://nearbypermits.com/boston/permit/SF1878880/) |
| Aug 17, 2026 | [139 Martin Luther King Jr Bl](https://nearbypermits.com/boston/address/139-martin-luther-king-jr-bl/) | 410 ft NW | Plumbing | replace tub to shower | $1,500 | [PL1887334](https://nearbypermits.com/boston/permit/PL1887334/) |
| Aug 4, 2026 | [139 Martin Luther King Jr Bl](https://nearbypermits.com/boston/address/139-martin-luther-king-jr-bl/) | 410 ft NW | Other | tub to shower conversion in 2nd bathroom | $16,363 | [SF1865614](https://nearbypermits.com/boston/permit/SF1865614/) |
| Jul 30, 2026 | [78 Harold St](https://nearbypermits.com/boston/address/78-harold-st/) | 740 ft SE | Roofing | Gray EZTPO Roofing Replacement on lower back section of flat roof. Asphalt shingles replacement on back half of roof around skylight. Gutter and downspouts replacement on section where we are replacing the flat lower roof. | $8,699 | [SF1874772](https://nearbypermits.com/boston/permit/SF1874772/) |
| Jul 30, 2026 | [107 Munroe St](https://nearbypermits.com/boston/address/107-munroe-st/) | 360 ft SE | Alteration or repair | we would like to add a half bath to the first floor living space which would include 1 toilet, 1 sink, and proper ventilation. | $9,000 | [SF1847636](https://nearbypermits.com/boston/permit/SF1847636/) |
| Jul 14, 2026 | [56-86 Codman Pk](https://nearbypermits.com/boston/address/56--86-codman-pk/) | 960 ft W | Alteration or repair | Unit A11 Install of all new windows Replacement of full roof with new ice and water replacement of all Pvc trim on rakes soffits and corner boards Install of new railing and duckboards on exterior decks Painting to body of building 2 coats install of all new storm doors | $860,808 | [SF1867881](https://nearbypermits.com/boston/permit/SF1867881/) |
| Jul 14, 2026 | [33-35 Townsend St](https://nearbypermits.com/boston/address/33--35-townsend-st/) | 690 ft SW | Alteration or repair | Unit A8 Install of all new windows Replacement of full roof with new ice and water replacement of all Pvc trim on rakes soffits and corner boards Install of new railing and duckboards on exterior decks Painting to body of building 2 coats install of all new storm doors | $292,122 | [SF1867872](https://nearbypermits.com/boston/permit/SF1867872/) |
| Jul 1, 2026 | [95 Munroe St](https://nearbypermits.com/boston/address/95-munroe-st/) | 580 ft SE | Roofing | Strip and reroof | $22,000 | [SF1867963](https://nearbypermits.com/boston/permit/SF1867963/) |
| Jun 29, 2026 | [54 Townsend St](https://nearbypermits.com/boston/address/54-townsend-st/) | 510 ft SW | Plumbing | Replacement of gas water heater | $2,980 | [PL1865215](https://nearbypermits.com/boston/permit/PL1865215/) |
| Jun 29, 2026 | [54 Townsend St](https://nearbypermits.com/boston/address/54-townsend-st/) | 510 ft SW | Plumbing | Replacement of gas water heater | $2,980 | [G1865208](https://nearbypermits.com/boston/permit/G1865208/) |
| Jun 29, 2026 | [52 Townsend St](https://nearbypermits.com/boston/address/52-townsend-st/) | 500 ft SW | Alteration or repair | Change occupancy from 3 units to 4 units in conjunction with;ALT1564659 | Not listed | [ALT1863456](https://nearbypermits.com/boston/permit/ALT1863456/) |
| Jun 29, 2026 | [50 Townsend St](https://nearbypermits.com/boston/address/50-townsend-st/) | 510 ft SW | Alteration or repair | Change occupancy from 3 units to 4 units in conjunction with ALT1564659 | Not listed | [ALT1863455](https://nearbypermits.com/boston/permit/ALT1863455/) |
| Jun 24, 2026 | [50-52 Townsend St](https://nearbypermits.com/boston/address/50--52-townsend-st/) | 510 ft SW | Alteration or repair | Combine 50 Townsend with 52 Townsend into 1 building to be known as 50-52 Townsend St.;Change occupancy from a 6 family to an 8 family to include 2 units in the basement &; Subdivide to original 50 and 52 Townsend. | $300,000 | [ALT1564659](https://nearbypermits.com/boston/permit/ALT1564659/) |
| May 29, 2026 | [30 Townsend St](https://nearbypermits.com/boston/address/30-townsend-st/) | 560 ft W | Plumbing | Bath Kitchens Laundry's Water heaters | $18,000 | [PL1855926](https://nearbypermits.com/boston/permit/PL1855926/) |
| May 29, 2026 | [30 Townsend St](https://nearbypermits.com/boston/address/30-townsend-st/) | 560 ft W | Plumbing | Range Water heater Furnace | $6,200 | [G1855922](https://nearbypermits.com/boston/permit/G1855922/) |
| May 29, 2026 | [30 Townsend St](https://nearbypermits.com/boston/address/30-townsend-st/) | 560 ft W | Electrical | Wiring a 2 family home with all new kitchens and baths and upgrading the service to a 400 amp service. | $36,000 | [E1855894](https://nearbypermits.com/boston/permit/E1855894/) |
| May 14, 2026 | [150 Martin Luther King Jr Bl](https://nearbypermits.com/boston/address/150-martin-luther-king-jr-bl/) | 590 ft NE | Other | Setting up a hexagon, (2) 20x20, and (2) 30x30 tents for the ymca summer program | $20,670 | [SF1848185](https://nearbypermits.com/boston/permit/SF1848185/) |
| May 6, 2026 | [67 Townsend St](https://nearbypermits.com/boston/address/67-townsend-st/) | 760 ft SW | Roofing | Strip and reroof | $17,500 | [SF1843750](https://nearbypermits.com/boston/permit/SF1843750/) |

### Farther (1,000 ft to ¼ mi), 31 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Oct 7, 2026 | [71 Dale St](https://nearbypermits.com/boston/address/71-dale-st/) | 0.24 mi NE | Plumbing | Replace steam boiler | $5,000 | [G1906247](https://nearbypermits.com/boston/permit/G1906247/) |
| Oct 2, 2026 | [6 Humboldt Av](https://nearbypermits.com/boston/address/6-humboldt-av/) | 0.23 mi E | Mechanical (HVAC) | Installing 6 zone ductless mini split system | $17,000 | [SF1904115](https://nearbypermits.com/boston/permit/SF1904115/) |
| Oct 2, 2026 | [71 Dale St](https://nearbypermits.com/boston/address/71-dale-st/) | 0.24 mi NE | Plumbing | Replace heating boiler | $5,000 | [PL1906249](https://nearbypermits.com/boston/permit/PL1906249/) |
| Sep 30, 2026 | [6 Humboldt Av](https://nearbypermits.com/boston/address/6-humboldt-av/) | 0.23 mi E | Electrical | Wiring condenser for ductless mini split system | $1,500 | [E1904103](https://nearbypermits.com/boston/permit/E1904103/) |
| Sep 23, 2026 | [120 Walnut Av](https://nearbypermits.com/boston/address/120-walnut-av/) | 0.24 mi E | Roofing | Church Slate Roof Restoration/Replacement (for affected area only) | $10,000 | [SF1902172](https://nearbypermits.com/boston/permit/SF1902172/) |
| Sep 22, 2026 | [279 Walnut Av](https://nearbypermits.com/boston/address/279-walnut-av/) | 0.24 mi SW | Alteration or repair | 2nd floor bathroom: demo drywall bathroom shower and repalce with shower. 3rd floor: Demo drywall bathtub and replace with new bathtub and replacing toilet on 3rd floor bathroom. Inspections for firesafeing and/or insulation. | $42,230 | [SF1888259](https://nearbypermits.com/boston/permit/SF1888259/) |
| Sep 8, 2026 | [6 Humboldt Av](https://nearbypermits.com/boston/address/6-humboldt-av/) | 0.23 mi E | Alteration or repair | Install 23 sq replacement siding - no structural work | $26,417 | [SF1897242](https://nearbypermits.com/boston/permit/SF1897242/) |
| Sep 8, 2026 | [21 Marcella St](https://nearbypermits.com/boston/address/21-marcella-st/) | 0.23 mi NW | Electrical | Low voltage alarm install | $1,200 | [ELV1895432](https://nearbypermits.com/boston/permit/ELV1895432/) |
| Aug 25, 2026 | [2691 Washington St](https://nearbypermits.com/boston/address/2691-washington-st/) | 0.24 mi N | Plumbing | Work to be done at 2693 Washington;REPLACEING GAS WATER HEATER | $4,500 | [PL1893976](https://nearbypermits.com/boston/permit/PL1893976/) |
| Aug 25, 2026 | [2691 Washington St](https://nearbypermits.com/boston/address/2691-washington-st/) | 0.24 mi N | Plumbing | Work to be done at 2693 washington;replacing flexible gas pipe with hard pipe | $4,500 | [G1893980](https://nearbypermits.com/boston/permit/G1893980/) |
| Aug 24, 2026 | [2691 Washington St](https://nearbypermits.com/boston/address/2691-washington-st/) | 0.24 mi N | Electrical | Rewiring of a hot water heater | $750 | [E1889546](https://nearbypermits.com/boston/permit/E1889546/) |
| Aug 21, 2026 | [69 Holworthy St](https://nearbypermits.com/boston/address/69-holworthy-st/) | 0.23 mi S | Roofing | Strip and reroof | $19,800 | [SF1880468](https://nearbypermits.com/boston/permit/SF1880468/) |
| Aug 21, 2026 | [115 Dale St](https://nearbypermits.com/boston/address/115-dale-st/) | 0.20 mi NE | Electrical | rewire unit take out aluminum wiring and wire with coper wire unit 6 | $12,000 | [E1890963](https://nearbypermits.com/boston/permit/E1890963/) |
| Aug 20, 2026 | [139 Thornton St](https://nearbypermits.com/boston/address/139-thornton-st/) | 0.20 mi NW | Alteration or repair | demo and rebuild rear porch with in the same footprint | $36,000 | [SF1875273](https://nearbypermits.com/boston/permit/SF1875273/) |
| Aug 18, 2026 | [102 Thornton St](https://nearbypermits.com/boston/address/102-thornton-st/) | 0.23 mi N | Plumbing | Replace gas piping for laundry. | $1,250 | [G1888860](https://nearbypermits.com/boston/permit/G1888860/) |
| Aug 17, 2026 | [279 Walnut Av](https://nearbypermits.com/boston/address/279-walnut-av/) | 0.24 mi SW | Plumbing | 2nd floor bathroom shower and valve replacement. 3rd floor bathtub, valve and toilet replacement. | $8,000 | [PL1888266](https://nearbypermits.com/boston/permit/PL1888266/) |
| Aug 7, 2026 | [2691 Washington St](https://nearbypermits.com/boston/address/2691-washington-st/) | 0.24 mi N | Alteration or repair | - Utility Room: Fire restoration, including framing and replacing one I-joist. - Front Door: Installation of a new front door. - Foyer: Repairing the foyer ceiling. - Exterior: Reinstalling siding and installing windows. * Work to be done at secondary address 2693 Washington* | $12,990 | [SF1881743](https://nearbypermits.com/boston/permit/SF1881743/) |
| Jul 31, 2026 | [4-6 Marcella St](https://nearbypermits.com/boston/address/4--6-marcella-st/) | 0.19 mi W | Plumbing | Gas furnace replacement | $6,500 | [G1875942](https://nearbypermits.com/boston/permit/G1875942/) |
| Jul 28, 2026 | [108 Harold St](https://nearbypermits.com/boston/address/108-harold-st/) | 0.19 mi S | Electrical | Wire 3 ton outdoor condenser with disconnect and communication wire. | $1,000 | [E1878412](https://nearbypermits.com/boston/permit/E1878412/) |
| Jul 14, 2026 | [57-79 Codman Pk](https://nearbypermits.com/boston/address/57--79-codman-pk/) | 0.22 mi W | Alteration or repair | Unit A10 Install of all new windows Replacement of full roof with new ice and water replacement of all Pvc trim on rakes soffits and corner boards Install of new railing and duckboards on exterior decks Painting to body of building 2 coats install of all new storm doors | $674,354 | [SF1867877](https://nearbypermits.com/boston/permit/SF1867877/) |
| Jul 14, 2026 | [2884-2894 Washington St](https://nearbypermits.com/boston/address/2884--2894-washington-st/) | 0.20 mi W | Alteration or repair | Unit A7 Install of all new windows Replacement of full roof with new ice and water replacement of all Pvc trim on rakes soffits and corner boards Install of new railing and duckboards on exterior decks Painting to body of building 2 coats install of all new storm doors | $384,525 | [SF1867870](https://nearbypermits.com/boston/permit/SF1867870/) |
| Jun 24, 2026 | [71 Dale St](https://nearbypermits.com/boston/address/71-dale-st/) | 0.24 mi NE | Electrical | Replace bathroom fan with panasonic bath fan and air cycler smart switch for weatherization work. | $1,200 | [E1863731](https://nearbypermits.com/boston/permit/E1863731/) |
| Jun 11, 2026 | [2691 Washington St](https://nearbypermits.com/boston/address/2691-washington-st/) | 0.24 mi N | Alteration or repair | Insulation work as part of the MASS Save program. Specifically for unit 2693 | $2,000 | [SF1858676](https://nearbypermits.com/boston/permit/SF1858676/) |
| Jun 11, 2026 | [151 Townsend St](https://nearbypermits.com/boston/address/151-townsend-st/) | 0.22 mi SE | Alteration or repair | Change the legal occupancy from a two-family dwelling to a four family-dwelling.; (Project cost reflected on short form $720,000)eplan -- BOA decision valid until 06/2026 -- BBRS | $67,750 | [ALT1513823](https://nearbypermits.com/boston/permit/ALT1513823/) |
| Jun 2, 2026 | [118-120 Thornton St](https://nearbypermits.com/boston/address/118--120-thornton-st/) | 0.20 mi N | Alteration or repair | Install Intellijack support system to stabilize floor joist or beams as shown | $8,469 | [ALT1830442](https://nearbypermits.com/boston/permit/ALT1830442/) |
| May 19, 2026 | [114 Harrishof St](https://nearbypermits.com/boston/address/114-harrishof-st/) | 0.23 mi S | Roofing | Strip and reroof. | $28,250 | [SF1851237](https://nearbypermits.com/boston/permit/SF1851237/) |
| May 11, 2026 | [145 Townsend St](https://nearbypermits.com/boston/address/145-townsend-st/) | 0.21 mi SE | Alteration or repair | Remove existing bathtub to be replaced with new walk in shower & surround walls. All new fixtures like for like within same footprint as existing. No structural changes. Plumber will pull their own permit. All debris leaves job site with crew. | $20,046 | [SF1846687](https://nearbypermits.com/boston/permit/SF1846687/) |
| May 9, 2026 | [145 Townsend St](https://nearbypermits.com/boston/address/145-townsend-st/) | 0.21 mi SE | Plumbing | replace tub to shower, lav and toilet | $1,500 | [PL1846958](https://nearbypermits.com/boston/permit/PL1846958/) |
| May 8, 2026 | [79 Holworthy St](https://nearbypermits.com/boston/address/79-holworthy-st/) | 0.23 mi S | Electrical | 60 amp electric service to feed monitoring cabinet | $10,000 | [E1847410](https://nearbypermits.com/boston/permit/E1847410/) |
| May 6, 2026 | [160 Harrishof St](https://nearbypermits.com/boston/address/160-harrishof-st/) | 0.19 mi SW | Fire systems | The direct replacement of a fialed convnetional fire panel with a New Addressable FACP and Zone Modules. | $32,000 | [EFA1842191](https://nearbypermits.com/boston/permit/EFA1842191/) |
| May 4, 2026 | [71 Dale St](https://nearbypermits.com/boston/address/71-dale-st/) | 0.24 mi NE | Alteration or repair | Blown in cellulose insulation at exterior walls, air sealing and weatherization. | $23,954 | [SF1844614](https://nearbypermits.com/boston/permit/SF1844614/) |

## Zoning requests nearby

There are no zoning requests on file within ¼ mi. Boston's feed was last read Oct 9.

## More on this street

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

- [14 Mayfair St](https://nearbypermits.com/boston/address/14-mayfair-st/): newest permit Dec 2, 2024

---
Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-09 21:12 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Zoning requests come from the Boston Zoning Board of Appeal tracker (https://data.boston.gov/dataset/zoning-board-of-appeal-tracker). We read it Oct 9, 19:47 UTC.

Map, all 6 permits at this address and 63 nearby: https://nearbypermits.com/boston/address/18-mayfair-st/