Design is where an ADU stops being a box of allowed square footage and becomes a home someone genuinely wants to live in. Good design decisions early — the floor plan, the ceiling height, where the kitchen and bath sit, how light enters — determine how the finished unit feels, how well it rents, and how much you enjoy it if a family member moves in. Poor early decisions are expensive to undo once framing is up.
The most important design choice is the floor plan, and the right plan depends on your goal. A studio maximizes buildable rent per square foot on a tight lot; a one-bedroom suits couples and single professionals; a two-bedroom serves families and roommates and typically commands the strongest rents in much of Southern California. Beyond the bedroom count, thoughtful details — an open living-kitchen zone, generous windows, smart storage, and a private entrance — make even a compact unit feel like a real home rather than a converted outbuilding.
Vision ADU designs for how a unit will actually be used. Our owner-led team has built everything from a compact 320 sq ft coastal unit to a 1,100 sq ft three-bedroom second home, and that range means we design to the goal in front of us — top-of-market rental, multigenerational living, or a flexible guest house — rather than defaulting to a single template. We also plan the unseen essentials early: where water, sewer, and electrical will run, since utility hookups quietly shape both the floor plan and the budget.
The guides in this stage cover design and plan resources, floor plans by size from studio to two-bedroom, the plans that rent best, current Southern California design trends, and the utility-hookup planning that ties design to construction. Use them to sharpen your vision, then bring that vision to a builder who can turn it into permit-ready plans. When you're ready to talk specifics, book a consultation and we'll translate your goals into a floor plan your lot supports.
Bring your goals to our owner-led team and we'll translate them into a permit-ready plan.
Book a Design ConsultationGuides in This Stage
ADU Plans and Design Resources in California (2026)
Where to find ADU plans in California — pre-approved city catalogs, architect-led custom design, and the trade-offs of each route.
ADU Floor Plans by Size: Studio to 2-Bedroom (California 2026)
What fits inside a studio, 1-bedroom, or 2-bedroom ADU in California — typical room dimensions, layout strategies, and what each size rents for.
Best ADU Floor Plans for Maximum Rental Income
Discover which ADU layouts and floor plans generate the highest rental returns in Southern California -- from studios to two-bedroom designs.
Top ADU Design Trends in Southern California for 2025
From indoor-outdoor living to smart home integration, discover the hottest ADU design trends that maximize rental income and property value in LA and Orange County.
ADU Utility Hookups: Water, Sewer, Electric & Gas Scope Guide
ADU utility requirements depend on the existing house, distance to service lines, panel capacity, meter strategy, site access, and local utility rules. This guide explains what your contractor must verify before preparing a written estimate.