Accessory Dwelling Unit (ADU) Construction in Boise, ID — Costs $59,350 to $346,208
What does accessory dwelling unit (adu) construction cost in Boise? Average $148,375, ranging $59,350–$346,208. Labor runs $30.25/hr locally — 1% below the national average. Free breakdown with material + labor split.
Boise, ID Market
-1% vs nationalLabor Rate
$30.25/hr
Material Index
97
Avg Permit Cost
$1,852
Median Home Price
$347,811
Boise is a mid-sized city in Idaho 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. Boise offers slightly below-average renovation costs, giving homeowners a small cost advantage compared to most US markets. The median home in Boise is valued at $347,811, putting this project at about 42.7% of home value — a moderate investment with a projected 80% ROI.
Low Estimate
$59,350
National: $60,000
Mid-Range
$148,375
National: $150,000
High End
$346,208
National: $350,000
Per Sq Ft
$247
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Boise
Adjusted for Boise's labor rate ($30.25/hr) and material costs (index 97).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Boise
$148,375
Based on 200 sq ft at mid quality, adjusted for Boise market rates.
Local Cost Breakdown
At Boise's average rate of $30.25/hr (1% above national avg)
Material cost index 97 (3% below national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Boise
| Metric | Boise | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $148,375 | $150,000 |
| Median Home Price | $347,811 | $350,000 |
| Project as % of Home Value | 42.7% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $80,749 | $75,000 |
What Affects the Price in Boise
- 1Local labor rates ($30.25/hr in Boise)
- 2Material cost index (97 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 Boise, ID
Second Story Addition
$197,833
Room Addition
$89,025
Swimming Pool Installation
$64,047
Garage Addition
$54,404
Home Addition
$78,980
Inground Swimming Pool
$63,922
Attic Conversion
$54,510
Swimming Pool Construction
$49,554
Accessory Dwelling Unit (ADU) Construction in Other Idaho Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Boise
Building permits are typically required for a accessory dwelling unit (adu) construction in Boise. The average permit fee in this area is $1,852, 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 Boise, skilled contractors charge an average of $30.25/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
With a median household income of $80,749, many Boise residents can budget for this project through savings. The mid-range cost of $148,375 represents 184% 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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View labor rates, material costs, and project estimates for Boise, ID.
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