# Building permits at 21 Mendum St, Boston, MA

Nine permits on record here. The newest, May 29: Per Pat Curran's instructions, this is a permit to replace existing siding with Hardie plank. Within a quarter mile, the city has issued 53 more permits (50 projects) since May 1.

## At this address

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| May 29, 2026 | Alteration or repair | Per Pat Curran's instructions, this is a permit to replace existing siding with Hardie plank, install new window trim, corner boards and water table and paint the house. | $91,207 | [SF1850763](https://nearbypermits.com/boston/permit/SF1850763/) |
| Feb 27, 2026 | Alteration or repair | Remodel kitchen and half bathroom. Replace one window and one exterior door. Add ducted heating and cooling to 1st floor. Add ductless mini-split heat pumps to 2nd and 3rd floor. | $402,897 | [SF1823288](https://nearbypermits.com/boston/permit/SF1823288/) |
| Feb 13, 2026 | Electrical | Remodel kitchen and dining area. upgrade service | $15,000 | [E1821093](https://nearbypermits.com/boston/permit/E1821093/) |
| Feb 9, 2026 | Plumbing | Remodel kitchen & 1/2 bath | $8,750 | [PL1819490](https://nearbypermits.com/boston/permit/PL1819490/) |
| Feb 6, 2026 | Alteration or repair | Exploratory demo for Kitchen renovation | $13,000 | [SF1818733](https://nearbypermits.com/boston/permit/SF1818733/) |
| Feb 20, 2019 | Electrical | Re wire existing outlets & lighting, add recess lighting | $5,000 | [E919432](https://nearbypermits.com/boston/permit/E919432/) |
| Nov 2, 2018 | Plumbing | gas preventor on new gas boiler | $150 | [PL880489](https://nearbypermits.com/boston/permit/PL880489/) |
| Nov 2, 2018 | Plumbing | installation of new gas boiler | $1,000 | [G880490](https://nearbypermits.com/boston/permit/G880490/) |
| Apr 7, 2015 | Roofing | Strip and re-shingle existing roof. Re-roof existing low slope roof areas with.060 rubber roofing system | $11,300 | [SF460472](https://nearbypermits.com/boston/permit/SF460472/) |

## Within ¼ mi since May 1, 2026

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

### Next door (under 250 ft), 1 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| May 27, 2026 | [34 Mendum St](https://nearbypermits.com/boston/address/34-mendum-st/) | 190 ft W | Alteration or repair | Remove and replace 1 window; like for like size; no structural changes | $8,309 | [SF1847234](https://nearbypermits.com/boston/permit/SF1847234/) |

### This block (250 to 1,000 ft), 27 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | [40 Arborough Rd](https://nearbypermits.com/boston/address/40-arborough-rd/) | 650 ft S | Electrical | 200amp service upgrade 1 heat pump condenser | $5,000 | [E1905215](https://nearbypermits.com/boston/permit/E1905215/) |
| Sep 30, 2026 | [22-24 Arborough Rd](https://nearbypermits.com/boston/address/22--24-arborough-rd/) | 760 ft S | Roofing | Replace the asphalt roof on home. | $19,500 | [SF1905779](https://nearbypermits.com/boston/permit/SF1905779/) |
| Sep 25, 2026 | [13 Ashfield St](https://nearbypermits.com/boston/address/13-ashfield-st/) | 760 ft SW | Electrical | Replace blocks in meter for Eversource AMI project | $2,000 | [E1891404](https://nearbypermits.com/boston/permit/E1891404/) |
| Sep 14, 2026 | [99 Walter St](https://nearbypermits.com/boston/address/99-walter-st/) | 600 ft W | Alteration or repair | Interior renovation of an existing one-family dwelling garage to change its use from a parking garage to an art studio, as shown on the plans. | $107,000 | [ALT1844025](https://nearbypermits.com/boston/permit/ALT1844025/) |
| Sep 4, 2026 | [125 Walter St](https://nearbypermits.com/boston/address/125-walter-st/) | 420 ft W | Demolition | replace decking and rails on front porch | $15,000 | [SF1897761](https://nearbypermits.com/boston/permit/SF1897761/) |
| Sep 1, 2026 | [40 Arborough Rd](https://nearbypermits.com/boston/address/40-arborough-rd/) | 650 ft S | Alteration or repair | Mass save insulation | $6,579 | [SF1889575](https://nearbypermits.com/boston/permit/SF1889575/) |
| Sep 1, 2026 | [32 Arborough Rd](https://nearbypermits.com/boston/address/32-arborough-rd/) | 690 ft S | Alteration or repair | Demo decking and rotted framing, replace where needed. Possibly add new footing if not proper. Replace decking rails with cable rail Replace decking | $40,425 | [SF1885909](https://nearbypermits.com/boston/permit/SF1885909/) |
| Aug 27, 2026 | [15 Ashfield St](https://nearbypermits.com/boston/address/15-ashfield-st/) | 750 ft SW | Electrical | Wire a new dormer | $9,500 | [E1895005](https://nearbypermits.com/boston/permit/E1895005/) |
| Aug 10, 2026 | [49 Fairview St](https://nearbypermits.com/boston/address/49-fairview-st/) | 540 ft S | Plumbing | gas stove on 3rd floor | $350 | [G1882971](https://nearbypermits.com/boston/permit/G1882971/) |
| Aug 9, 2026 | [12 Primrose St](https://nearbypermits.com/boston/address/12-primrose-st/) | 650 ft SW | Electrical | Upgrade service to 200 Amps per unit | $7,500 | [E1882556](https://nearbypermits.com/boston/permit/E1882556/) |
| Aug 6, 2026 | [109 Walter St](https://nearbypermits.com/boston/address/109-walter-st/) | 460 ft W | Alteration or repair | insulate kneewall slope and gable end wall with fiberglass and 2": thermal barrier board insulate attic slope with cellulose insulation install bath fan hose | $4,107 | [SF1880353](https://nearbypermits.com/boston/permit/SF1880353/) |
| Jul 22, 2026 | [10 Ashfield St](https://nearbypermits.com/boston/address/10-ashfield-st/) | 890 ft SW | Fence, wall or deck | Back Deck Renovation: remove railing, balusters, wood floor. Replace 4x4 poles that necessary.cover support system. Instal new AZEK floor, cover 4x4 posts. Install universal rail KIt | $23,000 | [SF1870584](https://nearbypermits.com/boston/permit/SF1870584/) |
| Jul 21, 2026 | [16 Ashfield St](https://nearbypermits.com/boston/address/16-ashfield-st/) | 870 ft SW | Alteration or repair | Weatherization, Insulation, Air Sealing | $7,100 | [SF1862724](https://nearbypermits.com/boston/permit/SF1862724/) |
| Jul 20, 2026 | [28 Primrose St](https://nearbypermits.com/boston/address/28-primrose-st/) | 630 ft SW | Alteration or repair | Insulation work as part of the MASS Save program. We are only doing unit 2 | $6,000 | [SF1864438](https://nearbypermits.com/boston/permit/SF1864438/) |
| Jul 7, 2026 | [20 Cotton St](https://nearbypermits.com/boston/address/20-cotton-st/) | 390 ft SW | Addition | 342 Sf single story addition off the back of the existing home. New footings, framing, windows, doors, electrical & HVAC is proposed. As well as a partial renovation to the existing half bath to a full bath next to the addition. | $152,000 | [ALT1734282](https://nearbypermits.com/boston/permit/ALT1734282/) |
| Jul 2, 2026 | [51 Cotton St](https://nearbypermits.com/boston/address/51-cotton-st/) | 380 ft W | Fence, wall or deck | Remove & replace 1 patio door; 1 entry door; like for like size; no structural changes | $15,096 | [SF1862509](https://nearbypermits.com/boston/permit/SF1862509/) |
| Jun 23, 2026 | [15 Ashfield St](https://nearbypermits.com/boston/address/15-ashfield-st/) | 750 ft SW | Alteration or repair | Confirm occupancy of single family &; Construct a shed style dormer with interior finishes.; | $229,438 | [ALT1832903](https://nearbypermits.com/boston/permit/ALT1832903/) |
| Jun 8, 2026 | [41 Fairview St](https://nearbypermits.com/boston/address/41-fairview-st/) | 630 ft S | Solar | Remove pre-existent solar array for roof replacement. 20 panels total. Reinstall solar on roof. | $6,000 | [SF1856572](https://nearbypermits.com/boston/permit/SF1856572/) |
| Jun 8, 2026 | [41 Fairview St](https://nearbypermits.com/boston/address/41-fairview-st/) | 630 ft S | Solar | Remove pre-existent solar array for roof replacement. 20 panels total. Reinstall solar on roof. | $6,000 | [E1856576](https://nearbypermits.com/boston/permit/E1856576/) |
| Jun 8, 2026 | [41 Fairview St](https://nearbypermits.com/boston/address/41-fairview-st/) | 630 ft S | Roofing | Asphalt shingles replacement on the entire house. | $25,199 | [SF1850286](https://nearbypermits.com/boston/permit/SF1850286/) |
| May 27, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 580 ft W | Alteration or repair | Air sealing, Insulation, Weatherization | $13,413 | [SF1849769](https://nearbypermits.com/boston/permit/SF1849769/) |
| May 22, 2026 | [104 Walter St](https://nearbypermits.com/boston/address/104-walter-st/) | 650 ft W | Solar | Installation of (12) 440w roof top solar modules and associated electrical work. | $25,329 | [SF1842764](https://nearbypermits.com/boston/permit/SF1842764/) |
| May 19, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 580 ft W | Mechanical (HVAC) | - Installation of 3.5 ton ductless heat pump system to serve the home | $31,913 | [SF1846309](https://nearbypermits.com/boston/permit/SF1846309/) |
| May 19, 2026 | [32-34 Fairview St](https://nearbypermits.com/boston/address/32--34-fairview-st/) | 740 ft S | Alteration or repair | Bathroom Renovation: No change to plumbing location, and no removal or relocation of walls. Removing horsehair wall covering and replacing it with sheetrock. Replacing tub, tub surround, showerhead, exhaust fan, vanity, and toilet with new fixtures. Adding a heated tiled floor. | $20,000 | [SF1842620](https://nearbypermits.com/boston/permit/SF1842620/) |
| May 13, 2026 | [26 Fairview St](https://nearbypermits.com/boston/address/26-fairview-st/) | 910 ft S | Roofing | Remove existing asphalt shingles and install new asphalt shingles, underlayment, flashing, and proper ventilation. Owens Corning | $18,775 | [SF1843645](https://nearbypermits.com/boston/permit/SF1843645/) |
| May 11, 2026 | [32-34 Fairview St](https://nearbypermits.com/boston/address/32--34-fairview-st/) | 740 ft S | Plumbing | Replace toilet, bathtub, and sink on 2nd floor | $4,500 | [PL1847406](https://nearbypermits.com/boston/permit/PL1847406/) |
| May 7, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 580 ft W | Electrical | - Service upgrade 100A to 200A - Wiring of 1 heat pump condenser - GFCI outlet | $6,950 | [E1846310](https://nearbypermits.com/boston/permit/E1846310/) |

### Farther (1,000 ft to ¼ mi), 25 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Oct 5, 2026 | [182 Walter St](https://nearbypermits.com/boston/address/182-walter-st/) | 0.20 mi NW | Electrical | New service for COB Street light control cabinet. | $15,000 | [E1906124](https://nearbypermits.com/boston/permit/E1906124/) |
| Oct 5, 2026 | [655-657 South St](https://nearbypermits.com/boston/address/655--657-south-st/) | 0.21 mi SE | Solar | Adding a TESLA POWERWALL 3 1707000-21 BATTERY to the existing solar system. | $18,500 | [ALT1880183](https://nearbypermits.com/boston/permit/ALT1880183/) |
| Sep 18, 2026 | [11 Ardale St](https://nearbypermits.com/boston/address/11-ardale-st/) | 0.24 mi W | Alteration or repair | Demolish existing deck. Dig 5 new 12" footings. Frame a new deck and stairs out of 2x8 pressure treated lumber. Install mahogany decking. Reuse handrails. | $34,250 | [SF1902420](https://nearbypermits.com/boston/permit/SF1902420/) |
| Sep 8, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 0.24 mi SW | Alteration or repair | Remove Non-Structural wall, patch and paint to match. Flooring repairs where wall was located. | $4,200 | [SF1895302](https://nearbypermits.com/boston/permit/SF1895302/) |
| Sep 8, 2026 | [57 Walter St](https://nearbypermits.com/boston/address/57-walter-st/) | 0.22 mi SW | Alteration or repair | confirm occupancy of existing single family | Not listed | [ALT1880633](https://nearbypermits.com/boston/permit/ALT1880633/) |
| Sep 1, 2026 | [18 Basto Te](https://nearbypermits.com/boston/address/18-basto-te/) | 0.24 mi SW | Alteration or repair | Insulation work as part of the MASS Save program. | $3,000 | [SF1895105](https://nearbypermits.com/boston/permit/SF1895105/) |
| Sep 1, 2026 | [178 Walter St](https://nearbypermits.com/boston/address/178-walter-st/) | 0.19 mi NW | Roofing | Strip and re-roof | $8,750 | [SF1894127](https://nearbypermits.com/boston/permit/SF1894127/) |
| Sep 1, 2026 | [22 Conway St](https://nearbypermits.com/boston/address/22-conway-st/) | 0.21 mi S | Alteration or repair | insulating the kneewall slope with 2" rigid board also insulating the kneewall floor with 12" of cellulose and air sealing | $957 | [SF1889613](https://nearbypermits.com/boston/permit/SF1889613/) |
| Aug 27, 2026 | [22 Conway St](https://nearbypermits.com/boston/address/22-conway-st/) | 0.21 mi S | Solar | Installation of (12) roof mounted solar panels and microinverters with 5.280 kWDC rated output. No ESS. | $11,000 | [ALT1883203](https://nearbypermits.com/boston/permit/ALT1883203/) |
| Aug 6, 2026 | [22 Conway St](https://nearbypermits.com/boston/address/22-conway-st/) | 0.21 mi S | Solar | Installation of (12) roof mounted solar panels and microinverters with 5.280 kWDC rated output. No ESS. | $7,000 | [E1883207](https://nearbypermits.com/boston/permit/E1883207/) |
| Aug 26, 2026 | [14 Symmes St](https://nearbypermits.com/boston/address/14-symmes-st/) | 0.21 mi SW | Alteration or repair | Change of Occupancy from a single family with ADU to 2 family | $1,000 | [ALT1885542](https://nearbypermits.com/boston/permit/ALT1885542/) |
| Aug 25, 2026 | [57 Walter St](https://nearbypermits.com/boston/address/57-walter-st/) | 0.22 mi SW | Roofing | Pending;ALT1880633 Occupancy Committee.strip and install a new roof | $23,045 | [SF1879588](https://nearbypermits.com/boston/permit/SF1879588/) |
| Aug 6, 2026 | [10 Symmes St](https://nearbypermits.com/boston/address/10-symmes-st/) | 0.21 mi SW | Roofing | Remove existing cupola and replace roofing underneath. | $2,499 | [SF1880912](https://nearbypermits.com/boston/permit/SF1880912/) |
| Aug 3, 2026 | [655-657 South St](https://nearbypermits.com/boston/address/655--657-south-st/) | 0.21 mi SE | Electrical | Tesla powerwall 3 1707000-21 battery installation. | $18,500 | [E1880155](https://nearbypermits.com/boston/permit/E1880155/) |
| Jul 28, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 0.24 mi SW | Electrical | rewire 2nd floor bathroom- minor reno (new bath, new tile) wire new 1/2 bathroom on 2rd floor | $4,000 | [E1878807](https://nearbypermits.com/boston/permit/E1878807/) |
| Jul 23, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 0.24 mi SW | Plumbing | Second floor a toilet and a lab third floor a tub, a sink.And a toilet | $9,000 | [PL1877420](https://nearbypermits.com/boston/permit/PL1877420/) |
| Jul 23, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 0.24 mi SW | Plumbing | Installin one full bath in the basement with a shower and kitchen. Sake and a laundry room, awful, bad catch you. Sick, how long do you go on?Take a number oh | $9,000 | [PL1877373](https://nearbypermits.com/boston/permit/PL1877373/) |
| Jul 21, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 0.24 mi SW | Alteration or repair | Half bath addition and Full bathroom remodel | $50,676 | [SF1875125](https://nearbypermits.com/boston/permit/SF1875125/) |
| Jul 20, 2026 | [29 Conway St](https://nearbypermits.com/boston/address/29-conway-st/) | 0.19 mi S | Plumbing | Install 40 gal gas water heater in unit 2 | $500 | [PL1871323](https://nearbypermits.com/boston/permit/PL1871323/) |
| Jul 20, 2026 | [29 Conway St](https://nearbypermits.com/boston/address/29-conway-st/) | 0.19 mi S | Plumbing | Install 40 gal gas water heater in unit 2 | $500 | [G1871319](https://nearbypermits.com/boston/permit/G1871319/) |
| Jul 17, 2026 | [669 South St](https://nearbypermits.com/boston/address/669-south-st/) | 0.23 mi SE | Fence, wall or deck | Emergency repair and replacement of existing retaining wall. | $80,000 | [SF1858327](https://nearbypermits.com/boston/permit/SF1858327/) |
| Jul 13, 2026 | [640 South St](https://nearbypermits.com/boston/address/640-south-st/) | 0.22 mi SE | Alteration or repair | Remodel of kitchen and bath | $40,000 | [SF1871326](https://nearbypermits.com/boston/permit/SF1871326/) |
| May 18, 2026 | [617 South St](https://nearbypermits.com/boston/address/617-south-st/) | 0.23 mi E | Plumbing | water heater replacement | $2,000 | [PL1849976](https://nearbypermits.com/boston/permit/PL1849976/) |
| May 14, 2026 | [37 Eldon St](https://nearbypermits.com/boston/address/37-eldon-st/) | 0.24 mi NW | Solar | Installation of roof mounted photovoltaic solar systems, 10.66 KW 26 panels with installation of 1 franklin battery installed on exterior of home | $76,800 | [E1848361](https://nearbypermits.com/boston/permit/E1848361/) |
| May 1, 2026 | [634 South St](https://nearbypermits.com/boston/address/634-south-st/) | 0.23 mi E | Plumbing | Renovation of a 2-1/2 bath one kitchen and laundry. | $25,000 | [PL1840360](https://nearbypermits.com/boston/permit/PL1840360/) |

## More on this street

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

- [22 Mendum St](https://nearbypermits.com/boston/address/22-mendum-st/): newest permit Dec 19, 2024
- [19 Mendum St](https://nearbypermits.com/boston/address/19-mendum-st/): newest permit Sep 29, 2025
- [25 Mendum St](https://nearbypermits.com/boston/address/25-mendum-st/): newest permit Apr 16, 2025
- [26 Mendum St](https://nearbypermits.com/boston/address/26-mendum-st/): newest permit Apr 17, 2026
- [27 Mendum St](https://nearbypermits.com/boston/address/27-mendum-st/): newest permit Sep 26, 2025
- [33-35 Mendum St](https://nearbypermits.com/boston/address/33--35-mendum-st/): newest permit Nov 14, 2025
- [34 Mendum St](https://nearbypermits.com/boston/address/34-mendum-st/): newest permit May 27, 2026
- [4 Mendum St](https://nearbypermits.com/boston/address/4-mendum-st/): newest permit Mar 10, 2025
- [3 Mendum St](https://nearbypermits.com/boston/address/3-mendum-st/): newest permit Aug 26, 2025
- [2 Mendum St](https://nearbypermits.com/boston/address/2-mendum-st/): newest permit Oct 10, 2025

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-06 22:07 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Map, all 9 permits at this address and 53 nearby: https://nearbypermits.com/boston/address/21-mendum-st/