Garage Conversion To ADU in Mercer Island, WA

Garage Conversion To ADU in Mercer Island, WA

When Mercer Island homeowners search for garage conversion to ADU or a dependable adus & conversions contractor near them, they want craftsmanship that lasts and a crew that communicates. That's exactly what we do. Convert a garage into a legal, livable ADU.

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 garage conversion to ADU

A typical garage conversion to ADU in Mercer Island can involve permits, utilities, finishes, 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 a garage conversion to ADU cost in Mercer Island?

Most garage conversion to ADU projects in Mercer Island fall between $78,000 – $208,000, 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 adus & conversions project — so there are no surprises later.

Why Mercer Island homeowners choose Xion Build

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

Transparent, written estimates with no hidden fees — you know what you're paying for before work begins.

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

Our Mercer Island 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.

Design and material selections come next, so finishes, fixtures, and pricing are locked in before demolition — no surprises mid-project.

We pull the permits, schedule every trade in the right order, and protect your home, landscaping, and daily routine throughout the build.

Frequently asked questions

Related services in Mercer Island

We also serve these areas