ADU Model · Studio

350 Sq Ft Studio ADU

An open studio with a full kitchen, full bath, in-unit laundry, and 9-foot ceilings. Starting from $165,000.

Get a Free Consultation

The 350 sq ft studio is where most Bay Area homeowners start — the lowest entry point into ADU ownership, and the fastest path to rental income. At 20' × 17'-6", it fits on lots where larger models won't, and because it stays under 750 sq ft, it's exempt from impact fees entirely. Like every model in our Bay Area ADU lineup, it's built on your lot as a true design-build project — custom, not prefab.

Model Specifications
Size
350 sq ft · 20' × 17'-6"
Configuration
Studio · 1 Bath
Ceiling Height
9 feet
Starting From
$165,000
Construction
4–5 months
Permit Approval
40–60 days
Room Dimensions
Living / sleeping area 15'-6" × 11'-2" · Kitchen 15'-6" × 5'-0" · Bath 5'-0" × 8'-0" · Plus walk-in closet, pantry, and in-unit washer/dryer
Impact Fees
Exempt — under California's 750 sq ft threshold. Saves $10,000–$30,000 compared to a larger unit.

Floor Plan & Interior

An efficient open plan that puts every square foot to work. The living and sleeping area sits under 9-foot ceilings with the kitchen along one wall, the bath and walk-in closet tucked to the side, and a dedicated spot for the washer/dryer — so nothing feels like an afterthought.

350 sq ft studio ADU floor plan with dimensions by California Bay Builders Bay Area 350 sq ft studio ADU interior with 9 foot ceilings and full kitchen by California Bay Builders

Adjustable Within Reason

Every model is adjustable — door and window placement, bath configuration (your choice of tub or walk-in shower), and all finish selections are yours to make. We'll also adapt the plan to your lot, setbacks, and access.

The value of building from our models is that the layout, engineering, and Title 24 are already dialed in — which is exactly what keeps your price and timeline predictable. Fully custom redesigns are a different scope, and we'll walk you through that during your consultation.

Choose Your Style — Modern or Farmhouse

Same floor plan inside, two completely different looks outside. Your ADU should feel like it belongs on your property — which style fits best depends on your existing home and your city's design guidelines. We'll help you decide during design.

350 sq ft studio ADU modern exterior elevation by California Bay Builders Bay Area

Modern

Clean lines, dark window frames, and a flat-profile roof. Pairs well with contemporary homes and newer Bay Area neighborhoods.

350 sq ft studio ADU farmhouse exterior elevation by California Bay Builders Bay Area

Farmhouse

Board-and-batten siding, a pitched roof, and warmer detailing. A natural fit alongside traditional and craftsman-style homes.

Who Builds a 350 Sq Ft Studio

This is the model for homeowners who want the return without the footprint. It's the lowest-cost way into ADU ownership, and on smaller lots it's often the only option that works.

Rental Income

The fastest path to a rentable unit on land you already own. Lowest build cost of any model, with in-unit laundry and a full kitchen — the two things tenants actually shop for.

Smaller Lots

At 20' × 17'-6", this fits where larger models can't — tight side yards, shallow backyards, or lots where setbacks and coverage limits eat the buildable area.

Guest House or In-Law Suite

Real independence for a parent, an adult kid, or long-stay guests — private entrance, own kitchen and bath, no shared walls with the main house.

Home Office or Studio

A genuine separation between work and home, with a full bath and kitchen so you're not walking back inside all day. Converts to a rental whenever you want.

Why 9-Foot Ceilings Matter Here

In a 350 sq ft space, ceiling height does more work than square footage. Most builders frame ADUs at 8 feet. Every one of our models is 9 feet — which is the difference between a studio that feels like a small apartment and one that feels like a shed. It also means taller windows, better natural light, and a unit that shows and rents better.

Is the 350 Studio Right for Your Lot?

We'll walk your property, check your setbacks, and tell you honestly what fits — this model or another. Free consultation, no obligation. See pricing, what's included, permits, and financing on our Bay Area ADU page.