Second Story Additions in the Seattle–Tacoma area
When your lot says no but your family says more, the answer is up. A second story addition can double your home's living space without sacrificing a foot of yard — the boldest transformation in residential construction, and the one where five generations of structural expertise matter most.
The overview
Our approach to second story addition
Building up is the ultimate answer to the constraints many local homeowners face: setback rules, lot coverage limits, and yards too precious to pave over. By adding a full or partial second story, you gain bedrooms, baths, and often a new primary suite with territorial views — while keeping the gardens, play space, and outdoor living your ground level provides.
A second story is also the most structurally demanding addition there is. Existing foundations and walls must be evaluated and often reinforced to carry the new load; the roof must come off and a weatherproof plan must protect your home during the vulnerable window; stairs must be placed where they serve the new plan without wrecking the old one. This is precisely the engineering-heavy work our family has built its reputation on.
With in-house 3D design showing you the transformed home inside and out, disciplined weather-phased scheduling, full Pierce and King County permitting, and financing assistance for this scale of investment, we make the most ambitious addition type a controlled, confident process.
A note from Donovan
Your second story addition, treated like it's our own home.
I'm Donovan. My family has been building across the South Sound for five generations, and every second story addition project we take on gets the same promise: an honest budget range, a design you can walk through in photorealistic 3D before we build it, and a crew that treats your house the way we'd treat our own.
You won't be handed off to a call center or a stranger with a clipboard. You'll work with the same family that's earned its reputation one neighbor at a time — and we don't consider the job done until it feels like home.
— Donovan
Owner & Lead Designer · Licensed WA #HOMERDB750MH
Free design consultation
Tell us about your second story addition project and Donovan's team will reply within one business day — no obligation, just honest advice.
Why choose us
What sets our second story addition apart
Full & Partial Second Stories
From complete upper floors to additions over garages or single wings — scaled to your needs, budget, and structure.
Structural Engineering Depth
Foundation and wall load analysis, reinforcement design, and seismic detailing performed with licensed engineers before a single shingle moves.
Weather-Protection Protocol
Roof removal is planned around forecast windows with industrial shrink-wrap and staged framing, keeping your home dry through the critical phase.
New Primary Suites & Views
Upper floors are the natural home for a private parent's retreat — bedroom, bath, closet, and the sightlines only a second story offers.
Whole-House Exterior Redesign
Adding a level reinvents your home's face; our designers compose the new elevation so the finished house looks born two stories tall.
Stair & Flow Planning
We position the new staircase to serve both floors gracefully, preserving the ground level's function while unlocking the one above.
How it works
Our design-build process
Structural Feasibility Study
We assess your foundation, framing, and zoning height limits to confirm your home can go up and what reinforcement it needs.
Design & Engineering
Our team designs both floors and the new exterior in 3D while engineers finalize the structural package.
Permits & Logistics Planning
Approvals, material staging, temporary living arrangements, and the weather-phased construction schedule are locked before demolition.
Lift-Off & Framing
The roof comes off, reinforcement goes in, and the new story is framed and weathertight in a tightly compressed sequence.
Build-Out & Reveal
Systems, insulation, drywall, stairs, and finishes complete both the new floor and refreshed exterior, closed out with inspections and warranty.
When the tools come down and the crew heads home, what's left is yours — a house that finally feels like home.
Donovan& the crew
Start your second story addition projectFAQs
Second Story Addition questions
Can my home structurally support a second story?
Most single-story homes can — with the right reinforcement. Our feasibility study examines your foundation, wall framing, and soil conditions with a structural engineer, giving you a definitive answer and reinforcement scope before you commit to design.
How much does a second story addition cost?
Full second stories in our region typically run $350,000 to $700,000+ depending on size, structural reinforcement, and finishes; partial second stories over garages start lower. It is a serious investment that can nearly double a home's space and value, and financing assistance is available.
Do we have to move out during construction?
For full second stories, yes — typically for three to five months during the roof-off and major construction phases. For partial additions over a garage, staying home is often workable. We schedule the displacement window precisely so you can plan.
How do you keep the house dry with the roof off?
With obsessive planning: demolition timed to forecast windows, heavy-duty temporary weather protection systems, and framing crews sized to reach weathertight fast. Protecting your ground floor is treated as a project requirement, not a hope.
Is building up cheaper than building out?
Per square foot they are often comparable — second stories save foundation and roof area but add structural reinforcement. The real advantage of going up is preserving your yard and staying within lot coverage limits that would block a ground-level addition.
Will the finished house look like a remodel or a real two-story home?
Done right, no one can tell. Our designers recompose the entire exterior — rooflines, windows, siding, entry proportions — so the house reads as originally built two stories tall, which is exactly how it should appraise.