Looking for an addition contractor in Woodinville, WA? Describe your project once and up to three addition contractors who work in Woodinville and King County get back to you with a quote. It's free and there is no obligation.
Woodinville is home to about 13,942 people (2024 Census Bureau estimate), a growing community (+6.7% since 2020). With 2,483 people per sq mi, it is a suburban area. Growing families here often add space instead of moving.
Woodinville at a glance
- Population (Census Bureau estimate, 2024)
- 13,942 (+6.7% since 2020)
- Rank in Washington
- 71st of 281 cities and towns
- Land area
- 5.6 sq mi
- Population density
- 2,483 people per sq mi (suburban)
- Type
- City (Woodinville city)
- Main county
- King County
What to check before hiring in Woodinville
- Zoning: check Woodinville's setbacks, lot coverage and height limits first.
- License and permit: in Washington, additions are built by licensed contractors under a permit.
- Structure: second stories need an engineer to check the existing house.
- Price drivers: size, foundation, roof tie-in, plumbing and finishes.
Useful official resources
-
ICC: International Code Council
Official information and guidance.
-
NAHB
Official information and guidance.
Services available in Woodinville
-
Room addition
Ground-floor addition with foundation, framing, roof and finishes.
-
Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Woodinville
How much does an addition cost in Woodinville, WA?
It depends on size, foundation and finishes. Describe your project: contractors who serve Woodinville reply with a quote.
How long does it take?
Often a few months, plus design and permits.
Does an addition raise property taxes?
Usually, since it increases the assessed value.
Which addition contractors will contact me?
Up to three independent addition contractors who serve Woodinville and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.