ADUs & conversions · Newcastle, WA
Basement ADU Conversion in Newcastle, WA
Turn a basement into a separate-entry dwelling unit.
Basement ADU Conversion in Newcastle, WA
Looking for basement ADU conversion in Newcastle? Xion Build is a licensed, bonded, and insured adus & conversions contractor delivering standout results for Newcastle homeowners — start to finish, under one roof. Turn a basement into a separate-entry dwelling unit.
Newcastle's view homes and golf-community properties reward precise finish carpentry and remodels designed to make the most of the outlook.
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 basement ADU conversion
A typical basement ADU conversion in Newcastle can involve permits, utilities, finishes, framing — 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 basement ADU conversion cost in Newcastle?
Most basement ADU conversion projects in Newcastle fall between $100,500 – $225,500, 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 Newcastle 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.
Honest guidance on where to invest and where to save, so your budget goes toward what adds real, lasting value.
Our Newcastle 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.
Design and material selections come next, so finishes, fixtures, and pricing are locked in before demolition — no surprises mid-project.
Handoff includes a detailed walkthrough and a written warranty — not a crew that vanishes the moment the dust settles.
Frequently asked questions
Are you a licensed adus & conversions contractor?
Yes — Xion Build is licensed, bonded, and insured in WA. Every project is built to meet or exceed code and is backed by a written warranty.
How long does a basement ADU conversion take?
Timelines depend on scope and permitting. Once the plan is confirmed we give you a realistic schedule and keep you updated as the adus & conversions work progresses.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Newcastle.
What should we decide before starting a basement ADU conversion?
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 Newcastle.
How much does a basement ADU conversion cost in Newcastle?
Most basement ADU conversion projects in Newcastle run $100,500 – $225,500, depending on scope, finishes, and existing conditions. After a free in-home consultation we provide a detailed written estimate so your Newcastle price reflects the actual project — not a guess.
Related services in Newcastle
Garage conversion to ADU
Convert a garage into a legal, livable ADU.
View detailsADU kitchen & bath build-out
Compact, efficient kitchens and baths for ADUs.
View detailsAttached ADU build
Attached accessory dwelling units within the home's footprint.
View detailsShop & studio build
Detached shops, studios, and flex buildings.
View detailsWe also serve these areas