Home additions · Mill Creek, WA
Second-Story Addition in Mill Creek, WA
Build up to add bedrooms and baths while keeping your lot.
Second-Story Addition in Mill Creek, WA
When Mill Creek homeowners search for second-story addition or a dependable home additions contractor near them, they want craftsmanship that lasts and a crew that communicates. That's exactly what we do. Build up to add bedrooms and baths while keeping your lot.
Mill Creek's well-kept neighborhoods reward high-quality kitchen, bath, and outdoor-living upgrades that match the community's standard.
From room additions and bump-outs to second stories and full primary suites, we handle structural engineering and permits up front so there are no surprises.
What's included in your second-story addition
A typical second-story addition in Mill Creek can involve foundation work, insulation, framing, windows — and we put the full scope in writing so you know exactly what's covered before work starts.
A home addition lives or dies on the connection to the existing house — foundation, framing, and rooflines have to marry seamlessly so the new space feels original.
How much does a second-story addition cost in Mill Creek?
Most second-story addition projects in Mill Creek fall between $172,500 – $460,000, 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 home additions project — so there are no surprises later.
Why Mill Creek homeowners choose Xion Build
Meticulous job sites and clear daily communication, with respect for your home, your time, and your neighbors.
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 home additions process
It starts with a free, no-obligation consultation: what you want, the constraints, and a realistic budget range before you commit to anything.
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.
Frequently asked questions
What should we decide before starting a second-story addition?
Your budget range, must-haves, timeline, and any finishes you already love. For home additions work we also review access, existing conditions, and whether permits are required in Mill Creek.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Mill Creek.
Do you offer free estimates for second-story addition near Mill Creek?
Absolutely. We provide free, no-obligation in-home estimates throughout Mill Creek and the greater Eastside, with transparent, itemized pricing.
How much does a second-story addition cost in Mill Creek?
Most second-story addition projects in Mill Creek run $172,500 – $460,000, depending on scope, finishes, and existing conditions. After a free in-home consultation we provide a detailed written estimate so your Mill Creek price reflects the actual project — not a guess.
Are you a licensed home additions 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.
Related services in Mill Creek
Bump-out addition
Small cantilevered bump-outs to expand kitchens, baths, or dining.
View detailsPrimary suite addition
A new primary bedroom, bath, and closet wing.
View detailsGarage addition
Attached or detached garages framed, wired, and finished.
View detailsStructural tie-in & roofline match
Marry new framing and rooflines cleanly to the existing home.
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