ADU collection / Studio 400
400 sq ft · Original design concept
Studio 400
A compact backyard retreat with a full kitchen, a comfortable living and sleeping area, and its own bathroom.
Starting at $160,000
Open studio
Explore your options
Concept floor areaOpen studio
Layouts adapted to your property5–8 months
Construction after permits
Step inside
A closer look at Studio 400.
Original design concept renderings. Finishes and room arrangements are developed for your selected plan.
Compare the arrangement
Two ways to use your space.
Early space-planning diagrams show room relationships, not approved floor plans. Doorways, closets, wall thicknesses, circulation and dimensions are developed in your architectural drawings. Exterior and interior renderings illustrate the design direction.
Make it yours
Explore a layout. Build your estimate.
Layout concepts are subject to site-specific design and approval. Illustrations are not permit drawings.
Illustrative kitchen finish · final selections confirmed during design.
Your home, your priorities
Start with the space you need.
We develop your preferred layout around the property, the way you live, and the finishes you choose. Your written proposal confirms dimensions, specifications and pricing before construction.
Designed for everyday living
- A dedicated kitchen and private bathroom
- Natural light and a connection to the outdoors
- Practical storage and efficient circulation
- Materials and finishes selected with your team
Understand your starting price
$160,000 is a starting estimate for this model. Site work, utility connections, city fees, selected finishes and any changes to scope affect the final proposal.
Design and permitting time is separate from the construction estimate. Your final footprint and placement are developed for your lot.
Good questions about the Studio 400.
Why does Studio 400 cost more than Garage 400 at the same size?
Garage 400 reuses the slab, walls and roof of an existing garage. Studio 400 is a new detached building, so it needs its own foundation, new utility runs and solar panels. That is why it starts at $160,000 rather than $100,000.
Does a detached Studio 400 need solar panels?
Yes. New detached ADUs in California must have solar panels under the statewide Energy Code (Title 24). Solar appears as its own line in your proposal. A converted garage does not have this requirement.
How long does a Studio 400 take?
Construction takes about 5–8 months after permits are issued. Design, engineering and plan check come before that, and most ADU projects run six months to a year from the first meeting to move-in.
Does the starting price include design and permit fees?
No. The starting estimate is for construction only. Design and permit fees are separate and are itemized in your written proposal. Design and permitting time also comes before the construction timeline begins.
Take the next step
Let’s talk about your Studio 400.
Share your property location, goals and preferred model with Green Design and Build.
Request a model consultationIllustrative design concept, not a completed project or permit-ready plan. October 2026 starting estimate for Los Angeles and surrounding Southern California service areas. Final design and pricing follow a property review.
Request your model consultation
Your selected model, finishes and estimate will be included with your inquiry.