Three-Season Room Addition in Renton, WA — Costs $10,810 to $87,828
What does three-season room addition cost in Renton? Average $33,780, ranging $10,810–$87,828. Labor runs $44.98/hr locally — 35% above the national average. Free breakdown with material + labor split.
Renton, WA Market
+35% vs nationalLabor Rate
$44.98/hr
Material Index
123
Avg Permit Cost
$1,646
Median Home Price
$560,000
Renton is a mid-sized city in Washington with a healthy pool of local contractors. Homeowners generally have several options to compare for a three-season room addition, which helps keep pricing competitive. At 35% above the national average, Renton 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 $560,000, this three-season room addition represents just 6.0% of typical home value — a relatively small investment that can significantly boost curb appeal or functionality.
Low Estimate
$10,810
National: $8,000
Mid-Range
$33,780
National: $25,000
High End
$87,828
National: $65,000
Per Sq Ft
$128
National: $95
Three-Season Room Addition Cost Calculator for Renton
Adjusted for Renton's labor rate ($44.98/hr) and material costs (index 123).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Renton
$33,780
Based on 200 sq ft at mid quality, adjusted for Renton market rates.
Local Cost Breakdown
At Renton's average rate of $44.98/hr (50% above national avg)
Material cost index 123 (23% above national baseline of 100)
Three-Season Room Addition vs. Home Value in Renton
| Metric | Renton | National Avg |
|---|---|---|
| Three-Season Room Addition (Mid-Range) | $33,780 | $25,000 |
| Median Home Price | $560,000 | $350,000 |
| Project as % of Home Value | 6.0% | 7.1% |
| Estimated ROI | 50% | 50% |
| Median Household Income | $68,000 | $75,000 |
What Affects the Price in Renton
- 1Local labor rates ($44.98/hr in Renton)
- 2Material cost index (123 vs national 100)
- 3Size
- 4Foundation type
- 5Screen vs window panels
- 6Roof style
Popular Upgrades
- Interchangeable screen and window panels
- Ceiling fans
- Outdoor-rated furniture
Other Projects in Renton, WA
Second Story Addition
$272,933
Accessory Dwelling Unit (ADU) Construction
$204,700
Room Addition
$122,820
Swimming Pool Installation
$86,953
Home Addition
$108,096
Inground Swimming Pool
$86,077
Attic Conversion
$75,797
Swimming Pool Construction
$68,907
Three-Season Room Addition in Other Washington Cities
Planning a Three-Season Room Addition in Renton
Building permits are typically required for a three-season room addition in Renton. The average permit fee in this area is $1,646, though costs vary based on project scope. Permit fees in this market are above average — factor them into your total budget. Plan for 2-4 weeks from start to finish.
A three-season room addition is a complex project best left to licensed professionals. In Renton, skilled contractors charge an average of $44.98/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
For the median Renton household earning $68,000/year, this project at $33,780 represents a significant investment. Consider financing options or phasing the work to spread costs over time.
Three-Season Room Addition — National Guide
See the full national cost guide with DIY tips, cost factors, and ROI analysis.
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