Basement finishing · Mercer Island, WA
Basement Guest Suite in Mercer Island, WA
Self-contained guest suites with bath.
Basement Guest Suite in Mercer Island, WA
Xion Build provides expert basement guest suite in Mercer Island. As a trusted Mercer Island basement finishing contractor, we manage design, materials, permits, and every trade in-house so your project stays on schedule and on budget. Self-contained guest suites with bath.
Mercer Island projects often involve sloped lots, shoreline rules, and mid-century homes that benefit from thoughtful structural and design planning.
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 basement guest suite
A typical basement guest suite in Mercer Island can involve insulation, framing, egress, electrical — 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 basement guest suite cost in Mercer Island?
Most basement guest suite projects in Mercer Island fall between $23,500 – $65,000, 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 basement finishing project — so there are no surprises later.
Why Mercer Island homeowners choose Xion Build
Local crews who know Eastside permitting, inspections, and the way Pacific Northwest weather tests a home.
Licensed, bonded, and insured in Washington — every project is built to meet or exceed code and backed by a written warranty.
One dedicated point of contact coordinates the entire job, so you're never chasing subcontractors or wondering who's responsible.
Our Mercer Island basement finishing process
Each phase is inspected and documented, and we keep you updated so you always know what's happening and what's next.
We pull the permits, schedule every trade in the right order, and protect your home, landscaping, and daily routine throughout the build.
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 free estimates for basement guest suite near Mercer Island?
Absolutely. We provide free, no-obligation in-home estimates throughout Mercer Island and the greater Eastside, with transparent, itemized pricing.
How long does a basement guest suite take?
Timelines depend on scope and permitting. Once the plan is confirmed we give you a realistic schedule and keep you updated as the basement finishing work progresses.
What should we decide before starting a basement guest suite?
Your budget range, must-haves, timeline, and any finishes you already love. For basement finishing work we also review access, existing conditions, and whether permits are required in Mercer Island.
Do you offer a basement guest suite in Mercer Island, WA?
Yes. Self-contained guest suites with bath. Xion Build is a licensed, bonded, and insured basement finishing contractor serving Mercer Island and the surrounding WA communities.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Mercer Island.
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