ADU Floor Plans for San Diego County
Every Proteus ADU starts from one of 6 floor plans, ranging from a 336 sq ft studio suited to a home office or guest suite up to a 1,200 sq ft three bedroom that works as a full second residence. Published pricing runs $209,544 to $501,641, depending on the plan and the design aesthetic you choose.
Choosing a Size
Start with what the unit needs to do, then check what your lot allows. Many San Diego County jurisdictions permit a detached ADU up to 1,200 sq ft, but setbacks or an existing garage often decide the footprint first. A studio or one bedroom tends to be the right call for a home office, a guest suite, or aging parents; the two and three bedroom plans make more sense for long-term rental income or family moving in for good.
5 Design Aesthetics
Each plan is priced across 5 exterior styles — Modern Farmhouse, Modern Spanish, Modern, California Classic, and Full Custom — which is why every plan below shows a price range rather than a single number. The aesthetic changes finishes and elevation, not the layout inside. You can compare all of them on any plan's detail page.
Customization
These plans are starting points, not fixed catalog items. Our design team can move a single window, reconfigure a wall, or draw something entirely new for your lot. Pricing is subject to change based on your specific site needs and current market conditions — a free, no-obligation site feasibility visit is how we get you a real number.
