Basement Bathroom Addition in Mill Creek, WA

Basement Bathroom Addition in Mill Creek, WA

Xion Build provides expert basement bathroom addition in Mill Creek. As a trusted Mill Creek basement finishing contractor, we manage design, materials, permits, and every trade in-house so your project stays on schedule and on budget. Add a bath with proper plumbing and ejector if needed.

Mill Creek's well-kept neighborhoods reward high-quality kitchen, bath, and outdoor-living upgrades that match the community's standard.

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 bathroom addition

A typical basement bathroom addition in Mill Creek can involve framing, insulation, finishes, 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 bathroom addition cost in Mill Creek?

Most basement bathroom addition projects in Mill Creek fall between $44,500 – $111,500, 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 basement finishing project — so there are no surprises later.

Why Mill Creek homeowners choose Xion Build

Local crews who know Eastside permitting, inspections, and the way Pacific Northwest weather tests a home.

Honest guidance on where to invest and where to save, so your budget goes toward what adds real, lasting value.

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

Our Mill Creek basement finishing process

Handoff includes a detailed walkthrough and a written warranty — not a crew that vanishes the moment the dust settles.

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

Related services in Mill Creek

We also serve these areas