ADUs & conversions · Sammamish, WA
Detached ADU (DADU) Build in Sammamish, WA
Stand-alone backyard cottages from foundation to finish.
Detached ADU (DADU) Build in Sammamish, WA
When Sammamish 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.
Sammamish plateau homes are often large and family-focused, where additions, kitchens, and outdoor living spaces deliver the most lasting value.
You get a single point of contact, licensed and insured trades, and clear communication from the first sketch to the final walkthrough.
What's included in your detached ADU (DADU) build
A typical detached ADU (DADU) build in Sammamish can involve the kitchen and bath, foundation, framing, permits — and we put the full scope in writing so you know exactly what's covered before work starts.
We write scope in plain terms: what we'll do, the materials, the sequence, and how any surprises are handled if something is uncovered.
How much does a detached ADU (DADU) build cost in Sammamish?
Most detached ADU (DADU) build projects in Sammamish 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 Sammamish homeowners choose Xion Build
Transparent, written estimates with no hidden fees — you know what you're paying for before work begins.
Meticulous job sites and clear daily communication, with respect for your home, your time, and your neighbors.
One dedicated point of contact coordinates the entire job, so you're never chasing subcontractors or wondering who's responsible.
Our Sammamish adus & conversions process
We pull the permits, schedule every trade in the right order, and protect your home, landscaping, and daily routine throughout the build.
It starts with a free, no-obligation consultation: what you want, the constraints, and a realistic budget range before you commit to anything.
Handoff includes a detailed walkthrough and a written warranty — not a crew that vanishes the moment the dust settles.
Frequently asked questions
Do you offer a detached ADU (DADU) build in Sammamish, WA?
Yes. Stand-alone backyard cottages from foundation to finish. Xion Build is a licensed, bonded, and insured adus & conversions contractor serving Sammamish and the surrounding WA communities.
How much does a detached ADU (DADU) build cost in Sammamish?
Most detached ADU (DADU) build projects in Sammamish run $207,000 – $517,500, depending on scope, finishes, and existing conditions. After a free in-home consultation we provide a detailed written estimate so your Sammamish price reflects the actual project — not a guess.
What should we decide before starting a detached ADU (DADU) build?
Your budget range, must-haves, timeline, and any finishes you already love. For adus & conversions work we also review access, existing conditions, and whether permits are required in Sammamish.
Do you offer free estimates for detached ADU (DADU) build near Sammamish?
Absolutely. We provide free, no-obligation in-home estimates throughout Sammamish and the greater Eastside, with transparent, itemized pricing.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Sammamish.
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