Accessory Dwelling Unit (ADU) Construction in Westminster, CO — Costs $73,510 to $428,808
What does accessory dwelling unit (adu) construction cost in Westminster? Average $183,775, ranging $73,510–$428,808. Labor runs $42.31/hr locally — 23% above the national average. Free breakdown with material + labor split.
Westminster, CO Market
+23% vs nationalLabor Rate
$42.31/hr
Material Index
104
Avg Permit Cost
$1,601
Median Home Price
$445,000
Westminster is a mid-sized city in Colorado 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 23% above the national average, Westminster is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. The median home in Westminster is valued at $445,000, putting this project at about 41.3% of home value — a moderate investment with a projected 80% ROI.
Low Estimate
$73,510
National: $60,000
Mid-Range
$183,775
National: $150,000
High End
$428,808
National: $350,000
Per Sq Ft
$306
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Westminster
Adjusted for Westminster's labor rate ($42.31/hr) and material costs (index 104).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Westminster
$183,775
Based on 200 sq ft at mid quality, adjusted for Westminster market rates.
Local Cost Breakdown
At Westminster's average rate of $42.31/hr (41% above national avg)
Material cost index 104 (4% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Westminster
| Metric | Westminster | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $183,775 | $150,000 |
| Median Home Price | $445,000 | $350,000 |
| Project as % of Home Value | 41.3% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $72,000 | $75,000 |
What Affects the Price in Westminster
- 1Local labor rates ($42.31/hr in Westminster)
- 2Material cost index (104 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 Westminster, CO
Second Story Addition
$245,033
Room Addition
$110,265
Swimming Pool Installation
$77,229
Garage Addition
$67,384
Home Addition
$96,532
Inground Swimming Pool
$76,025
Attic Conversion
$68,403
Swimming Pool Construction
$62,184
Accessory Dwelling Unit (ADU) Construction in Other Colorado Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Westminster
Building permits are typically required for a accessory dwelling unit (adu) construction in Westminster. The average permit fee in this area is $1,601, 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 Westminster, skilled contractors charge an average of $42.31/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
For the median Westminster household earning $72,000/year, this project at $183,775 represents a significant investment. Consider financing options or phasing the work to spread costs over time.
Accessory Dwelling Unit (ADU) Construction — National Guide
See the full national cost guide with DIY tips, cost factors, and ROI analysis.
All Construction Costs in Westminster
View labor rates, material costs, and project estimates for Westminster, CO.
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