Home additions · Seattle, WA
In-Law Suite Addition in Seattle, WA
Self-contained suite with bedroom, bath, and kitchenette.
In-Law Suite Addition in Seattle, WA
Looking for in-law suite addition in Seattle? Xion Build is a licensed, bonded, and insured home additions contractor delivering standout results for Seattle homeowners — start to finish, under one roof. Self-contained suite with bedroom, bath, and kitchenette.
From Laurelhurst to Queen Anne, Seattle's older homes often need structural care alongside the kitchen, bath, and addition work that modernizes them.
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.
What's included in your in-law suite addition
A typical in-law suite addition in Seattle can involve framing, insulation, windows, finishes — and we put the full scope in writing so you know exactly what's covered before work starts.
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.
How much does an in-law suite addition cost in Seattle?
Most in-law suite addition projects in Seattle fall between $134,000 – $390,500, 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 home additions project — so there are no surprises later.
Why Seattle homeowners choose Xion Build
Transparent, written estimates with no hidden fees — you know what you're paying for before work begins.
Local crews who know Eastside permitting, inspections, and the way Pacific Northwest weather tests a home.
Meticulous job sites and clear daily communication, with respect for your home, your time, and your neighbors.
Our Seattle home additions process
Design and material selections come next, so finishes, fixtures, and pricing are locked in before demolition — no surprises mid-project.
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 an in-law suite 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.
What should we decide before starting an in-law suite 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 Seattle.
Do you offer free estimates for in-law suite addition near Seattle?
Absolutely. We provide free, no-obligation in-home estimates throughout Seattle and the greater Eastside, with transparent, itemized pricing.
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.
Do you handle permits and inspections?
Yes. We manage permit applications, schedule inspections, and coordinate any required engineering so the work passes cleanly in Seattle.
Related services in Seattle
Great room addition
A large open living and entertaining space.
View detailsFoundation & footings for additions
Engineered footings and foundations for new square footage.
View detailsRoom addition
Add a bedroom, office, or living space tied seamlessly into the home.
View detailsSunroom & four-season room
Insulated, conditioned sunrooms usable year-round.
View detailsWe also serve these areas