Detached ADU (DADU) Build in Mill Creek, WA

Detached ADU (DADU) Build in Mill Creek, WA

When Mill Creek homeowners search for detached ADU (DADU) build or a dependable adus & conversions contractor near them, they want craftsmanship that lasts and a crew that communicates. That's exactly what we do. Stand-alone backyard cottages from foundation to finish.

Mill Creek's well-kept neighborhoods reward high-quality kitchen, bath, and outdoor-living upgrades that match the community's standard.

We write scope in plain terms: what we'll do, the materials, the sequence, and how any surprises are handled if something is uncovered.

What's included in your detached ADU (DADU) build

A typical detached ADU (DADU) build in Mill Creek can involve finishes, framing, permits, the kitchen and bath — and we put the full scope in writing so you know exactly what's covered before work starts.

You get a single point of contact, licensed and insured trades, and clear communication from the first sketch to the final walkthrough.

How much does a detached ADU (DADU) build cost in Mill Creek?

Most detached ADU (DADU) build projects in Mill Creek fall between $207,000 – $517,500, depending on the size of the space, the finishes you choose, and the condition of what's already there.

Because every home is different, we don't quote final numbers sight unseen. After a free in-home consultation you get a detailed, itemized estimate tied to your actual adus & conversions project — so there are no surprises later.

Why Mill Creek homeowners choose Xion Build

Local crews who know Eastside permitting, inspections, and the way Pacific Northwest weather tests a home.

Meticulous job sites and clear daily communication, with respect for your home, your time, and your neighbors.

Licensed, bonded, and insured in Washington — every project is built to meet or exceed code and backed by a written warranty.

Our Mill Creek adus & conversions process

It starts with a free, no-obligation consultation: what you want, the constraints, and a realistic budget range before you commit to anything.

Each phase is inspected and documented, and we keep you updated so you always know what's happening and what's next.

Handoff includes a detailed walkthrough and a written warranty — not a crew that vanishes the moment the dust settles.

Frequently asked questions

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