Massachusetts legalized ADUs.
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Instant answers on permits, local bylaws, and consistency with state law — powered by real data from 293 towns.
1,224
ADUs Approved
293
Towns Tracked
75%
Approval RateⓘShare of 2025 applications approved in 2025
Top Towns
1
Boston
Suffolk · 675,647
44
permits
0.7
per 10k
64%
approval
44
permits
0.7
per 10k
64%
approval
2
Plymouth
Plymouth · 61,217
34
permits
5.6
per 10k
81%
approval
34
permits
5.6
per 10k
81%
approval
3
Lawrence
Essex · 89,143
32
permits
3.6
per 10k
73%
approval
32
permits
3.6
per 10k
73%
approval
4
Nantucket
Nantucket · 14,255
27
permits
18.9
per 10k
100%
approval
27
permits
18.9
per 10k
100%
approval
5
Lowell
Middlesex · 115,554
26
permits
2.3
per 10k
100%
approval
26
permits
2.3
per 10k
100%
approval
6
Somerville
Middlesex · 81,045
24
permits
3
per 10k
60%
approval
24
permits
3
per 10k
60%
approval
7
Milton
Norfolk · 28,630
24
permits
8.4
per 10k
96%
approval
24
permits
8.4
per 10k
96%
approval
8
Worcester
Worcester · 206,518
23
permits
1.1
per 10k
74%
approval
23
permits
1.1
per 10k
74%
approval
Trusted by
Homeowners, builders, and policy analysts across Massachusetts use ADU Pulse to navigate the post-Chapter 150 landscape. Our data powers research by housing advocates and is referenced in municipal planning discussions.
293
Towns Covered
28
Bylaws Analyzed
10
AG Decisions Tracked
Data: EOHLC ADU Survey Feb 2026 (293 of 351 MA municipalities). Population: Census ACS 2024. Approval rate = share of 2025 applications approved in 2025.