Build Up, Not Out: A Second-Story ADU Above What You Already Have.
When your lot is tight but your plans are big, a second-story ADU adds a full second home above your garage or existing structure — without giving up a square foot of yard. Design, engineering, permits, and construction, all handled in-house.
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Why Build Up
Keep Your Entire Yard
Your patio, garden, and outdoor living space stay exactly where they are, while a complete second home takes shape above. The number one reason homeowners build up.
Made for Smaller Lots
On tighter lots where a detached cottage won’t fit comfortably, going vertical opens possibilities that don’t exist at ground level.
Better Light, Air, and Views
Second-story ADUs get more natural light, better airflow, and actual views — more comfortable to live in and more attractive to tenants.
Privacy Built Into the Design
A second-story unit with its own exterior staircase is a genuinely separate home — no shared walls, no passing through your space.
Structural Considerations, Explained Simply
The engineering assessment comes first
Before we design anything, our team evaluates the existing structure — typically a garage — to determine whether it can support a second story or needs reinforcement. Sometimes existing framing works with modest upgrades; sometimes rebuilding the lower level makes more sense. You’ll know before you commit.
Reinforcement is normal, not a red flag
Many garages need structural strengthening — upgraded footings, shear walls, or new framing. This is standard construction, itemized in your quote, and exactly the work a licensed general engineering contractor (our A classification under CSLB #1138550) is built for.
Access and stairs are part of the design
Our designers integrate the exterior staircase so it looks intentional — matching materials, clean lines, proper lighting — not bolted on as an afterthought. Stair placement affects the layout below, and we plan both levels together.
Is a Second-Story ADU Right for You?
- Your lot is on the smaller side, and a ground-level ADU would eat the whole yard
- You have a detached garage in sound condition — or one you’re willing to rebuild
- You want to preserve outdoor living space your family actually uses
- You’re planning for rental income and want a unit that commands strong rent
- You’re housing a family member who wants real independence
Common Questions
Straight answers before you even call.
Is my garage strong enough to support a second story?
Maybe — and we’ll tell you honestly either way. Our structural assessment looks at foundation, framing, and condition, and determines what reinforcement (if any) is needed. You get the real answer before design begins, with costs itemized in your quote.
How much does a second-story ADU cost?
Most ADU Cities projects fall between $52,000 and $200,000. Second-story pricing depends heavily on the existing structure’s condition and required reinforcement. Your written quote itemizes every line — no allowances, no surprises.
How long does it take?
Most second-story projects run about 4–8 months from signed agreement to move-in, depending on your city’s permit timeline and the extent of structural work.
Do you handle permits and engineering?
Yes. Structural plans, engineering calculations, city submittal, corrections — all in-house. Second-story projects involve more engineering review, which is exactly why having design and engineering under one roof matters.
Your Second Story Starts With a Look at Your First.
We’ll evaluate your property, tell you what it qualifies for, and lay out real costs and timelines — free, no obligation.