Exterior Design
This is a single-story ADU (Accessory Dwelling Unit) with about **600 square feet** of heated living space.
The footprint is simple and efficient: approximately **30 ft by 20 ft**.
The exterior is styled with **board and batten siding**, giving the ADU cottage-like charm with clean lines and vertical textures. The roof uses a 7:12 pitch, and exterior walls are framed with **2×6** lumber for better insulation and strength.
Interior Layout
Entering the front leads into an open layout that spans the left half of the plan, combining kitchen and living spaces from front to back.
A stackable washer/dryer is tucked into the interior, saving space while offering laundry convenience without separate utility room.
The right side of the ADU holds a full-sized bedroom and a full bathroom. The layout keeps private and public zones well separated despite the compact size.
Floor Plan:
Bedrooms & Bathrooms
The ADU includes **1 bedroom**.
There is **1 full bathroom**, accessible from the bedroom. No extra half-bath.
Living & Dining Spaces
The living and kitchen spaces are combined front-to-back, promoting a sense of openness and making the most of the 600 sq ft. Natural light in this zone helps reduce the feeling of confinement.
Because the layout is compact, circulation is direct: minimal hallways, everything immediately accessible which boosts efficiency.
Kitchen Features
The kitchen is modest but functional; designed for efficiency rather than excess. The open side, visible from living space, helps maintain social connection while cooking.
Storage is limited but wisely laid out; the design includes essential cabinetry, and possibly pantry-type cabinets depending on finish choices.
Outdoor Living (porch, deck, patio, etc.)
This plan does **not** prominently feature large porches or decks in the base design. Outdoor living appears limited, so yard, patio, or landscaping will play a larger role for outdoor enjoyment.
Garage & Storage
There is **no garage** included in this ADU plan. Vehicle storage would have to be separate or custom added.
Storage internally is via closet(s) in the bedroom, bathroom storage, and cabinetry in the kitchen. The in-unit laundry further adds to utility without using separate rooms.
Bonus/Expansion Rooms
This plan has **no bonus room** or loft; everything is on the main floor.
Because of the simple footprint and roof structure (trusses, 7:12 pitch), it may be possible — depending on local code — to build up or modify roof space, but that would require custom design changes.
Estimated Building Cost
The estimated cost to build this ADU in the United States ranges between $200,000 – $350,000, depending on location, materials, labor, finishes, foundation type, and permit costs.
In summary, Plan 420089WNT is a well-proportioned ADU that maximizes function in a small footprint. With a clean board and batten exterior, open living/kitchen layout, one full bedroom and bath, and efficient storage solutions, it’s ideal for someone seeking a compact, comfortable secondary dwelling or rental unit without excess. Warm, smart, and just right.
