ADUs & conversions · Seattle, WA
ADU Design & Permitting in Seattle, WA
Plans and permits navigating local ADU rules.
ADU Design & Permitting in Seattle, WA
Xion Build provides expert ADU design & permitting in Seattle. As a trusted Seattle adus & conversions contractor, we manage design, materials, permits, and every trade in-house so your project stays on schedule and on budget. Plans and permits navigating local ADU rules.
From Laurelhurst to Queen Anne, Seattle's older homes often need structural care alongside the kitchen, bath, and addition work that modernizes them.
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 ADU design & permitting
A typical ADU design & permitting in Seattle can involve finishes, utilities, permits, foundation — 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 an ADU design & permitting cost in Seattle?
Most ADU design & permitting projects in Seattle fall between $95,500 – $215,500, 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 Seattle homeowners choose Xion Build
One dedicated point of contact coordinates the entire job, so you're never chasing subcontractors or wondering who's responsible.
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.
Our Seattle adus & conversions process
Each phase is inspected and documented, and we keep you updated so you always know what's happening and what's next.
It starts with a free, no-obligation consultation: what you want, the constraints, and a realistic budget range before you commit to anything.
Design and material selections come next, so finishes, fixtures, and pricing are locked in before demolition — no surprises mid-project.
Frequently asked questions
Do you offer an ADU design & permitting in Seattle, WA?
Yes. Plans and permits navigating local ADU rules. Xion Build is a licensed, bonded, and insured adus & conversions contractor serving Seattle and the surrounding WA communities.
Do you offer free estimates for ADU design & permitting near Seattle?
Absolutely. We provide free, no-obligation in-home estimates throughout Seattle and the greater Eastside, with transparent, itemized pricing.
What should we decide before starting an ADU design & permitting?
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 Seattle.
How much does an ADU design & permitting cost in Seattle?
Most ADU design & permitting projects in Seattle run $95,500 – $215,500, depending on scope, finishes, and existing conditions. After a free in-home consultation we provide a detailed written estimate so your Seattle price reflects the actual project — not a guess.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Seattle.
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