Accessory Dwelling Unit (ADU) Construction in Bellevue, WA — Costs $89,740 to $523,483
What does accessory dwelling unit (adu) construction cost in Bellevue? Average $224,350, ranging $89,740–$523,483. Labor runs $48.94/hr locally — 50% above the national average. Free breakdown with material + labor split.
Bellevue, WA Market
+50% vs nationalLabor Rate
$48.94/hr
Material Index
136
Avg Permit Cost
$2,365
Median Home Price
$582,044
Bellevue 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 50% above the national average, Bellevue 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 $582,044, this accessory dwelling unit (adu) construction represents just 38.5% of typical home value — a relatively small investment that can significantly boost curb appeal or functionality.
Low Estimate
$89,740
National: $60,000
Mid-Range
$224,350
National: $150,000
High End
$523,483
National: $350,000
Per Sq Ft
$374
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Bellevue
Adjusted for Bellevue's labor rate ($48.94/hr) and material costs (index 136).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Bellevue
$224,350
Based on 200 sq ft at mid quality, adjusted for Bellevue market rates.
Local Cost Breakdown
At Bellevue's average rate of $48.94/hr (63% above national avg)
Material cost index 136 (36% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Bellevue
| Metric | Bellevue | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $224,350 | $150,000 |
| Median Home Price | $582,044 | $350,000 |
| Project as % of Home Value | 38.5% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $94,385 | $75,000 |
What Affects the Price in Bellevue
- 1Local labor rates ($48.94/hr in Bellevue)
- 2Material cost index (136 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 Bellevue, WA
Second Story Addition
$299,133
Room Addition
$134,610
Swimming Pool Installation
$95,455
Garage Addition
$82,262
Home Addition
$118,568
Inground Swimming Pool
$94,573
Attic Conversion
$83,008
Swimming Pool Construction
$75,462
Accessory Dwelling Unit (ADU) Construction in Other Washington Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Bellevue
Building permits are typically required for a accessory dwelling unit (adu) construction in Bellevue. The average permit fee in this area is $2,365, 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 Bellevue, skilled contractors charge an average of $48.94/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
With a median household income of $94,385, many Bellevue residents can budget for this project through savings. The mid-range cost of $224,350 represents 238% 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 Bellevue
View labor rates, material costs, and project estimates for Bellevue, WA.
Explore All Project Cost Guides
Compare costs across 120+ home improvement projects in 3,636 cities nationwide.
View All Project Costs