Accessory Dwelling Unit (ADU) Construction in Spokane, WA — Costs $82,870 to $483,408
What does accessory dwelling unit (adu) construction cost in Spokane? Average $207,175, ranging $82,870–$483,408. Labor runs $44.47/hr locally — 38% above the national average. Free breakdown with material + labor split.
Spokane, WA Market
+38% vs nationalLabor Rate
$44.47/hr
Material Index
128
Avg Permit Cost
$2,146
Median Home Price
$611,113
Spokane is a mid-sized city in Washington 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 38% above the national average, Spokane is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. With a median home price of $611,113, this accessory dwelling unit (adu) construction represents just 33.9% of typical home value — a relatively small investment that can significantly boost curb appeal or functionality.
Low Estimate
$82,870
National: $60,000
Mid-Range
$207,175
National: $150,000
High End
$483,408
National: $350,000
Per Sq Ft
$345
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Spokane
Adjusted for Spokane's labor rate ($44.47/hr) and material costs (index 128).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Spokane
$207,175
Based on 200 sq ft at mid quality, adjusted for Spokane market rates.
Local Cost Breakdown
At Spokane's average rate of $44.47/hr (48% above national avg)
Material cost index 128 (28% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Spokane
| Metric | Spokane | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $207,175 | $150,000 |
| Median Home Price | $611,113 | $350,000 |
| Project as % of Home Value | 33.9% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $102,479 | $75,000 |
What Affects the Price in Spokane
- 1Local labor rates ($44.47/hr in Spokane)
- 2Material cost index (128 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 Spokane, WA
Second Story Addition
$276,233
Room Addition
$124,305
Swimming Pool Installation
$88,461
Garage Addition
$75,964
Home Addition
$109,684
Inground Swimming Pool
$87,803
Attic Conversion
$76,521
Swimming Pool Construction
$69,564
Accessory Dwelling Unit (ADU) Construction in Other Washington Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Spokane
Building permits are typically required for a accessory dwelling unit (adu) construction in Spokane. The average permit fee in this area is $2,146, 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 Spokane, skilled contractors charge an average of $44.47/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
With a median household income of $102,479, many Spokane residents can budget for this project through savings. The mid-range cost of $207,175 represents 202% 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.
All Construction Costs in Spokane
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