How Much Does It Cost to Build a Custom Home in Seattle?
By Eric Dexter, Owner & Builder ·
A custom single-family home in the Greater Seattle area typically costs $400,000 to $700,000+ all-in, or roughly $400–$700+ per square foot. Like our DADU cost breakdown, the honest number includes far more than framing — here's what actually shapes it.
What the all-in number includes
A believable custom-home budget covers three things, not one: design and permitting (soft costs), site development, and construction (hard costs). The advertised “per square foot” figure almost always hides the first two — and on a Pacific Northwest lot, that's where budgets blow up. See the full split on our realistic costs page.
What moves the price
- Size — square footage is the single biggest cost lever
- Finish level — standard, premium or luxury materials and fixtures
- Site conditions — slope, Environmental Critical Areas, utilities and access
- Design complexity — simple forms cost less than lots of corners and rooflines
Custom home vs. DADU costs
Custom homes run higher per square foot than a DADU because they're larger and often more finished, but the cost categories are the same. If you're weighing options, our cost calculator gives you a fast, honest ballpark for either.
Get a real number
Every lot and home is different, which is why we start with a feasibility study instead of quoting averages. Learn more about building a custom home with DIGS, or tell us about your project for a line-item estimate.
