Accessory Dwelling Unit (ADU) Construction in Brockton, MA — Costs $80,560 to $469,933
What does accessory dwelling unit (adu) construction cost in Brockton? Average $201,400, ranging $80,560–$469,933. Labor runs $42.46/hr locally — 34% above the national average. Free breakdown with material + labor split.
Brockton, MA Market
+34% vs nationalLabor Rate
$42.46/hr
Material Index
127
Avg Permit Cost
$1,622
Median Home Price
$426,069
Brockton is a mid-sized city in Massachusetts with a healthy pool of local contractors. Homeowners generally have several options to compare for a accessory dwelling unit (adu) construction, which helps keep pricing competitive. At 34% above the national average, Brockton is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. The median home in Brockton is valued at $426,069, putting this project at about 47.3% of home value — a moderate investment with a projected 80% ROI.
Low Estimate
$80,560
National: $60,000
Mid-Range
$201,400
National: $150,000
High End
$469,933
National: $350,000
Per Sq Ft
$336
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Brockton
Adjusted for Brockton's labor rate ($42.46/hr) and material costs (index 127).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Brockton
$201,400
Based on 200 sq ft at mid quality, adjusted for Brockton market rates.
Local Cost Breakdown
At Brockton's average rate of $42.46/hr (42% above national avg)
Material cost index 127 (27% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Brockton
| Metric | Brockton | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $201,400 | $150,000 |
| Median Home Price | $426,069 | $350,000 |
| Project as % of Home Value | 47.3% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $86,782 | $75,000 |
What Affects the Price in Brockton
- 1Local labor rates ($42.46/hr in Brockton)
- 2Material cost index (127 vs national 100)
- 3Attached vs detached
- 4Size and bedroom count
- 5Kitchen and bath quality
- 6Local ADU regulations
Popular Upgrades
- Full kitchen
- Separate entrance
- Solar panels for energy independence
Other Projects in Brockton, MA
Second Story Addition
$268,533
Room Addition
$120,840
Swimming Pool Installation
$86,329
Garage Addition
$73,847
Home Addition
$106,832
Inground Swimming Pool
$85,856
Attic Conversion
$74,246
Swimming Pool Construction
$67,497
Accessory Dwelling Unit (ADU) Construction in Other Massachusetts Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Brockton
Building permits are typically required for a accessory dwelling unit (adu) construction in Brockton. The average permit fee in this area is $1,622, though costs vary based on project scope. Permit fees in this market are above average — factor them into your total budget. Plan for 6-18 months from start to finish.
A accessory dwelling unit (adu) construction is a complex project best left to licensed professionals. In Brockton, skilled contractors charge an average of $42.46/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
With a median household income of $86,782, many Brockton residents can budget for this project through savings. The mid-range cost of $201,400 represents 232% of the typical household's annual income.
Accessory Dwelling Unit (ADU) Construction — National Guide
See the full national cost guide with DIY tips, cost factors, and ROI analysis.
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