Home additions · Mukilteo, WA
Second-Story Addition in Mukilteo, WA
Build up to add bedrooms and baths while keeping your lot.
Second-Story Addition in Mukilteo, WA
Xion Build provides expert second-story addition in Mukilteo. As a trusted Mukilteo home additions contractor, we manage design, materials, permits, and every trade in-house so your project stays on schedule and on budget. Build up to add bedrooms and baths while keeping your lot.
Mukilteo's bluff and waterfront homes call for weather-tight exteriors, decks, and remodels designed around the Sound views.
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 Mukilteo can involve roofline tie-in, finishes, windows, foundation work — 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 Mukilteo?
Most second-story addition projects in Mukilteo fall between $150,000 – $400,000, 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 Mukilteo 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.
One dedicated point of contact coordinates the entire job, so you're never chasing subcontractors or wondering who's responsible.
Our Mukilteo home additions process
Each phase is inspected and documented, and we keep you updated so you always know what's happening and what's next.
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.
Frequently asked questions
How long does a second-story addition take?
Timelines depend on scope and permitting. Once the plan is confirmed we give you a realistic schedule and keep you updated as the home additions work progresses.
Do you offer a second-story addition in Mukilteo, WA?
Yes. Build up to add bedrooms and baths while keeping your lot. Xion Build is a licensed, bonded, and insured home additions contractor serving Mukilteo and the surrounding WA communities.
Do you offer free estimates for second-story addition near Mukilteo?
Absolutely. We provide free, no-obligation in-home estimates throughout Mukilteo and the greater Eastside, with transparent, itemized pricing.
How much does a second-story addition cost in Mukilteo?
Most second-story addition projects in Mukilteo run $150,000 – $400,000, depending on scope, finishes, and existing conditions. After a free in-home consultation we provide a detailed written estimate so your Mukilteo price reflects the actual project — not a guess.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Mukilteo.
Related services in Mukilteo
Sunroom & four-season room
Insulated, conditioned sunrooms usable year-round.
View detailsStructural tie-in & roofline match
Marry new framing and rooflines cleanly to the existing home.
View detailsFoundation & footings for additions
Engineered footings and foundations for new square footage.
View detailsGarage addition
Attached or detached garages framed, wired, and finished.
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