# Building permits at 45 Cotton St, Boston, MA

Five permits on record here. The newest, Feb 6: Dense pack cellulose in exterior walls. Within a quarter mile, the city has issued 60 more permits (57 projects) since May 1.

## At this address

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| Feb 6, 2026 | Alteration or repair | Dense pack cellulose in exterior walls. R19 fgb and air sealing in rim joist. Mass Save. | $6,967 | [SF1818936](https://nearbypermits.com/boston/permit/SF1818936/) |
| Jul 15, 2019 | Solar | Installation of 8.375 kW DC solar power system with 25 panels | $24,790 | [SF970341](https://nearbypermits.com/boston/permit/SF970341/) |
| Jul 15, 2019 | Solar | Solar power system; 8.375 kW DC; 25 panels | $24,790 | [E970342](https://nearbypermits.com/boston/permit/E970342/) |
| Sep 11, 2013 | Plumbing | replace water heater | $1,485 | [PL272782](https://nearbypermits.com/boston/permit/PL272782/) |
| Sep 11, 2013 | Plumbing | replace water heater | $1,485 | [G272775](https://nearbypermits.com/boston/permit/G272775/) |

## Within ¼ mi since May 1, 2026

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

### Next door (under 250 ft), 7 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Sep 4, 2026 | [125 Walter St](https://nearbypermits.com/boston/address/125-walter-st/) | 190 ft N | Demolition | replace decking and rails on front porch | $15,000 | [SF1897761](https://nearbypermits.com/boston/permit/SF1897761/) |
| Aug 6, 2026 | [109 Walter St](https://nearbypermits.com/boston/address/109-walter-st/) | 100 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 2, 2026 | [51 Cotton St](https://nearbypermits.com/boston/address/51-cotton-st/) | 40 ft NW | Alteration or repair | Remove & replace 1 patio door; 1 entry door; like for like size; no structural changes | $15,096 | [SF1862509](https://nearbypermits.com/boston/permit/SF1862509/) |
| May 27, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 230 ft W | Alteration or repair | Air sealing, Insulation, Weatherization | $13,413 | [SF1849769](https://nearbypermits.com/boston/permit/SF1849769/) |
| May 27, 2026 | [34 Mendum St](https://nearbypermits.com/boston/address/34-mendum-st/) | 160 ft E | Alteration or repair | Remove and replace 1 window; like for like size; no structural changes | $8,309 | [SF1847234](https://nearbypermits.com/boston/permit/SF1847234/) |
| May 19, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 230 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 7, 2026 | [112 Walter St](https://nearbypermits.com/boston/address/112-walter-st/) | 230 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/) |

### This block (250 to 1,000 ft), 38 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Oct 8, 2026 | [99 Walter St](https://nearbypermits.com/boston/address/99-walter-st/) | 260 ft SW | Plumbing | Add half bath in garage, run new water and sewer to main house | $8,000 | [PL1908365](https://nearbypermits.com/boston/permit/PL1908365/) |
| Oct 8, 2026 | [104r-106r Walter St](https://nearbypermits.com/boston/address/104r--106r-walter-st/) | 360 ft W | Solar | Rough electrical wiring for contracted 'Enphase' solar system. (Final permits to be applied for at a later date) | $2,000 | [E1901583](https://nearbypermits.com/boston/permit/E1901583/) |
| Oct 5, 2026 | [182 Walter St](https://nearbypermits.com/boston/address/182-walter-st/) | 960 ft N | Electrical | New service for COB Street light control cabinet. | $15,000 | [E1906124](https://nearbypermits.com/boston/permit/E1906124/) |
| Oct 5, 2026 | [40 Arborough Rd](https://nearbypermits.com/boston/address/40-arborough-rd/) | 820 ft SE | 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/) | 850 ft SE | 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/) | 610 ft S | Electrical | Replace blocks in meter for Eversource AMI project | $2,000 | [E1891404](https://nearbypermits.com/boston/permit/E1891404/) |
| Sep 18, 2026 | [11 Ardale St](https://nearbypermits.com/boston/address/11-ardale-st/) | 930 ft SW | 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 14, 2026 | [99 Walter St](https://nearbypermits.com/boston/address/99-walter-st/) | 260 ft SW | 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 8, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 920 ft 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/) | 830 ft SW | Alteration or repair | confirm occupancy of existing single family | Not listed | [ALT1880633](https://nearbypermits.com/boston/permit/ALT1880633/) |
| Sep 1, 2026 | [178 Walter St](https://nearbypermits.com/boston/address/178-walter-st/) | 920 ft N | Roofing | Strip and re-roof | $8,750 | [SF1894127](https://nearbypermits.com/boston/permit/SF1894127/) |
| Sep 1, 2026 | [40 Arborough Rd](https://nearbypermits.com/boston/address/40-arborough-rd/) | 820 ft SE | 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/) | 830 ft SE | 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/) | 580 ft S | Electrical | Wire a new dormer | $9,500 | [E1895005](https://nearbypermits.com/boston/permit/E1895005/) |
| Aug 26, 2026 | [14 Symmes St](https://nearbypermits.com/boston/address/14-symmes-st/) | 910 ft S | 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/) | 830 ft SW | Roofing | Pending;ALT1880633 Occupancy Committee.strip and install a new roof | $23,045 | [SF1879588](https://nearbypermits.com/boston/permit/SF1879588/) |
| Aug 10, 2026 | [49 Fairview St](https://nearbypermits.com/boston/address/49-fairview-st/) | 680 ft SE | 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/) | 530 ft S | Electrical | Upgrade service to 200 Amps per unit | $7,500 | [E1882556](https://nearbypermits.com/boston/permit/E1882556/) |
| Aug 6, 2026 | [10 Symmes St](https://nearbypermits.com/boston/address/10-symmes-st/) | 940 ft S | Roofing | Remove existing cupola and replace roofing underneath. | $2,499 | [SF1880912](https://nearbypermits.com/boston/permit/SF1880912/) |
| Jul 28, 2026 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 920 ft 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/) | 920 ft 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/) | 920 ft 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 22, 2026 | [10 Ashfield St](https://nearbypermits.com/boston/address/10-ashfield-st/) | 730 ft S | 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 | [52 Walter St](https://nearbypermits.com/boston/address/52-walter-st/) | 920 ft SW | Alteration or repair | Half bath addition and Full bathroom remodel | $50,676 | [SF1875125](https://nearbypermits.com/boston/permit/SF1875125/) |
| Jul 21, 2026 | [16 Ashfield St](https://nearbypermits.com/boston/address/16-ashfield-st/) | 670 ft S | 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/) | 380 ft S | 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 20, 2026 | [29 Conway St](https://nearbypermits.com/boston/address/29-conway-st/) | 990 ft 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/) | 990 ft S | Plumbing | Install 40 gal gas water heater in unit 2 | $500 | [G1871319](https://nearbypermits.com/boston/permit/G1871319/) |
| Jul 7, 2026 | [20 Cotton St](https://nearbypermits.com/boston/address/20-cotton-st/) | 350 ft SE | 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/) |
| Jun 23, 2026 | [15 Ashfield St](https://nearbypermits.com/boston/address/15-ashfield-st/) | 580 ft S | 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/) | 700 ft SE | 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/) | 700 ft SE | 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/) | 700 ft SE | Roofing | Asphalt shingles replacement on the entire house. | $25,199 | [SF1850286](https://nearbypermits.com/boston/permit/SF1850286/) |
| May 29, 2026 | [21 Mendum St](https://nearbypermits.com/boston/address/21-mendum-st/) | 360 ft E | 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/) |
| May 22, 2026 | [104 Walter St](https://nearbypermits.com/boston/address/104-walter-st/) | 300 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 | [32-34 Fairview St](https://nearbypermits.com/boston/address/32--34-fairview-st/) | 680 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/) | 810 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/) | 680 ft S | Plumbing | Replace toilet, bathtub, and sink on 2nd floor | $4,500 | [PL1847406](https://nearbypermits.com/boston/permit/PL1847406/) |

### Farther (1,000 ft to ¼ mi), 15 permits

| Date | Address | Distance | Type | Work | Cost | Permit |
|---|---|---|---|---|---|---|
| Sep 1, 2026 | [18 Basto Te](https://nearbypermits.com/boston/address/18-basto-te/) | 0.19 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 | [22 Conway St](https://nearbypermits.com/boston/address/22-conway-st/) | 0.20 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 | [855 South St](https://nearbypermits.com/boston/address/855-south-st/) | 0.25 mi SW | Electrical | Replace meter sockets for apartments 1 and 2, install AMI meters for Eversource AMI project | $4,000 | [E1894673](https://nearbypermits.com/boston/permit/E1894673/) |
| Aug 27, 2026 | [22 Conway St](https://nearbypermits.com/boston/address/22-conway-st/) | 0.20 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/) | 0.20 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/) |
| Jul 30, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Fire systems | Furnish and install 120 volt smokes with lithium battery backup -(4) smoke carbons one on each level -(4) smokes in each bedroom | $1,000 | [EFA1879038](https://nearbypermits.com/boston/permit/EFA1879038/) |
| Jul 23, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Electrical | Whole-home rewire including new circuits for laundry, full kitchen power and lighting, pantry, bath, living/dining, hall, porch, bedrooms, attic, exterior GFCIs, smoke system, doorbell, 200A service upgrade, HVAC circuit, and added lighting/outlets. | $35,000 | [E1875971](https://nearbypermits.com/boston/permit/E1875971/) |
| Jul 20, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Plumbing | Renovation of Plumbing Fixtures | $7,000 | [PL1872596](https://nearbypermits.com/boston/permit/PL1872596/) |
| Jul 20, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Plumbing | Renovation of Gas Fixtures | $3,000 | [G1872600](https://nearbypermits.com/boston/permit/G1872600/) |
| Jul 14, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Alteration or repair | Interior renovations all new plumbing, electrical, hvac, insulation, board and plaster, tile work and carpentry. We will finish the kitchen and 1 full and 1/2 bath. We will have all new work done to code or exceeding. We will remove the debris via dumpster in the homes driveway. | $148,050 | [SF1861606](https://nearbypermits.com/boston/permit/SF1861606/) |
| Jun 26, 2026 | [831 South St](https://nearbypermits.com/boston/address/831-south-st/) | 0.24 mi S | Roofing | Replace the asphalt roof on home. | $16,800 | [SF1858926](https://nearbypermits.com/boston/permit/SF1858926/) |
| Jun 11, 2026 | [7 Basto Te](https://nearbypermits.com/boston/address/7-basto-te/) | 0.23 mi S | Alteration or repair | Exterior renovations including new roofing, siding, windows, trim work and decking. All new exterior work will be new pvc trim, Hardie board siding, new vinyl windows, composite decking and railings and asphalt shingles. We will remove all construction debris with a dumpster in the homes driveway. | $92,680 | [SF1857124](https://nearbypermits.com/boston/permit/SF1857124/) |
| Jun 8, 2026 | [11 Basto Te](https://nearbypermits.com/boston/address/11-basto-te/) | 0.22 mi S | Alteration or repair | Front porch renovation, install new floor, new door, new porch ceiling, remove old rubber roof, install new rubber roof, painting inside and outside. | $22,500 | [SF1858523](https://nearbypermits.com/boston/permit/SF1858523/) |
| Jun 4, 2026 | [65 Selwyn St](https://nearbypermits.com/boston/address/65-selwyn-st/) | 0.22 mi W | Alteration or repair | replacement of existing fire escape stairs and rebuild in same foot print as originals | $49,920 | [SF1847213](https://nearbypermits.com/boston/permit/SF1847213/) |
| May 14, 2026 | [37 Eldon St](https://nearbypermits.com/boston/address/37-eldon-st/) | 0.20 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/) |

## Zoning requests nearby

There are no zoning requests on file within ¼ mi. Boston's feed was last read Oct 14.

## More on this street

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

- [43 Cotton St](https://nearbypermits.com/boston/address/43-cotton-st/): newest permit Jun 25, 2025
- [51 Cotton St](https://nearbypermits.com/boston/address/51-cotton-st/): newest permit Jul 2, 2026
- [36 Cotton St](https://nearbypermits.com/boston/address/36-cotton-st/): newest permit May 2, 2025
- [35 Cotton St](https://nearbypermits.com/boston/address/35-cotton-st/): newest permit Nov 13, 2025
- [27 Cotton St](https://nearbypermits.com/boston/address/27-cotton-st/): newest permit Feb 11, 2026
- [20 Cotton St](https://nearbypermits.com/boston/address/20-cotton-st/): newest permit Jul 7, 2026
- [19-21 Cotton St](https://nearbypermits.com/boston/address/19--21-cotton-st/): newest permit Mar 16, 2026
- [12 Cotton St](https://nearbypermits.com/boston/address/12-cotton-st/): newest permit Oct 15, 2025
- [8 Cotton St](https://nearbypermits.com/boston/address/8-cotton-st/): newest permit Oct 2, 2025

---
Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-14 06:17 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 14, 03:47 UTC.

Map, all 5 permits at this address and 60 nearby: https://nearbypermits.com/boston/address/45-cotton-st/