Accessory Dwelling Unit (ADU) Construction in Tacoma, WA — Costs $72,120 to $420,700
What does accessory dwelling unit (adu) construction cost in Tacoma? Average $180,300, ranging $72,120–$420,700. Labor runs $37.62/hr locally — 20% above the national average. Free breakdown with material + labor split.
Tacoma, WA Market
+20% vs nationalLabor Rate
$37.62/hr
Material Index
115
Avg Permit Cost
$1,336
Median Home Price
$501,552
Tacoma 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 20% above the national average, Tacoma 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 $501,552, this accessory dwelling unit (adu) construction represents just 35.9% of typical home value — a relatively small investment that can significantly boost curb appeal or functionality.
Low Estimate
$72,120
National: $60,000
Mid-Range
$180,300
National: $150,000
High End
$420,700
National: $350,000
Per Sq Ft
$301
National: $250
Accessory Dwelling Unit (ADU) Construction Cost Calculator for Tacoma
Adjusted for Tacoma's labor rate ($37.62/hr) and material costs (index 115).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Tacoma
$180,300
Based on 200 sq ft at mid quality, adjusted for Tacoma market rates.
Local Cost Breakdown
At Tacoma's average rate of $37.62/hr (25% above national avg)
Material cost index 115 (15% above national baseline of 100)
Accessory Dwelling Unit (ADU) Construction vs. Home Value in Tacoma
| Metric | Tacoma | National Avg |
|---|---|---|
| Accessory Dwelling Unit (ADU) Construction (Mid-Range) | $180,300 | $150,000 |
| Median Home Price | $501,552 | $350,000 |
| Project as % of Home Value | 35.9% | 42.9% |
| Estimated ROI | 80% | 80% |
| Median Household Income | $78,142 | $75,000 |
What Affects the Price in Tacoma
- 1Local labor rates ($37.62/hr in Tacoma)
- 2Material cost index (115 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 Tacoma, WA
Second Story Addition
$240,400
Room Addition
$108,180
Swimming Pool Installation
$77,454
Garage Addition
$66,110
Home Addition
$95,744
Inground Swimming Pool
$77,116
Attic Conversion
$66,396
Swimming Pool Construction
$60,360
Accessory Dwelling Unit (ADU) Construction in Other Washington Cities
Planning a Accessory Dwelling Unit (ADU) Construction in Tacoma
Building permits are typically required for a accessory dwelling unit (adu) construction in Tacoma. The average permit fee in this area is $1,336, 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 Tacoma, skilled contractors charge an average of $37.62/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
For the median Tacoma household earning $78,142/year, this project at $180,300 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.
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