ADU Design That Fits Your Lot, Your Life, and Your Budget
Every property is different. We design ADUs specifically for your lot — maximizing space, natural light, and livability while meeting all Idaho building codes.
Design That Starts with Your Property
Generic floor plans downloaded from the internet rarely work. Your lot has specific setbacks, utility locations, slope conditions, and sun orientation that a cookie-cutter plan can't account for.
Our design process starts with the data from your Feasibility Check — real measurements, real utility locations, real constraints. The result is a design that's buildable, permit-ready, and optimized for your specific situation.
What's Included in Design:
- ✓Floor plans — optimized layout within the 45% size limit (per Title 10-6-10-B, your ADU cannot exceed 45% of your principal residence's living space)
- ✓Elevations — all four sides showing materials, windows, doors
- ✓Sections and details — wall assemblies, roof details, connections
- ✓Site plan — ADU placement, setbacks, utility runs
- ✓Material specifications — finishes, fixtures, and selections
- ✓Engineering — structural calculations as required
- ✓Stamped drawings — ready for permit submission
Design Considerations for Idaho:
- ✓2018 IRC compliance — Idaho follows the 2018 International Residential Code for all residential construction
- ✓Climate zone 5B/6B — insulation and energy requirements for Twin Falls area winters
- ✓Snow loads — roof design rated for Idaho snow load requirements
- ✓Setback compliance — per Title 10-6-10-A, detached ADUs under 15 ft get 3 ft side/rear setbacks; over 15 ft requires 5-7 ft side and 15-20 ft rear depending on district
- ✓Egress requirements — bedroom windows sized for emergency exit
- ✓Design match requirement — per Title 10-6-10-B, ADU must be consistent with existing roof pitch, siding, and windows of the principal dwelling
Popular ADU Layouts
Studio (400-500 sq ft)
Open-concept living and sleeping area with full kitchen and bathroom. Ideal for single occupants, short-term rental, or home office with guest capability.
From ~$80,000
1-Bedroom (550-750 sq ft)
Separate bedroom, living area, full kitchen, and bathroom. The most popular configuration for rental income or aging parents.
From ~$120,000
2-Bedroom (800-1,200 sq ft)
Two bedrooms, full living area, kitchen, and one or two bathrooms. Best for families, long-term rental, or maximum property value increase.
From ~$180,000
Garage Conversion Design
Converting an existing garage into an ADU requires specialized design — new foundations or floor leveling, insulation upgrades, window additions for egress, and utility routing. We design conversions that look and feel like purpose-built living spaces, not converted garages.
Design Is Part of Our Full-Service Process
We don't hand you drawings and walk away. Our design team works alongside our construction team, so every design decision is buildable, cost-effective, and practical. No redesigns mid-construction, no value engineering after the fact.
See Our Full ProcessReady to Design Your ADU?
Start with a free Readiness Call to discuss your property and goals. If an ADU is viable, we'll move to a Feasibility Check — the foundation for great design.