This compact yet lofty ADU (Accessory Dwelling Unit) offers **615 sq ft** of heated living space, featuring **1 bedroom**, **1 full bath**, and a vaulted living room that amplifies the sense of space. Large windows and modest detailing give it cottage charm in a small package.
Floor Plan:
Exterior Design
The exterior is simple and elegant, suitable for infill lots or backyard cottage projects. The roof over the main space is pitched to allow the vaulted living room, while lower shed roof elements may shelter entries or utility zones. Modest trim, vertical siding, or board-and-batten details likely accent the design without overcomplicating the façade.
Interior Layout & Flow
Entry leads directly into the vaulted living room, which is the emotional and visual center of the home. The vault gives height and openness, making the compact footprint feel more spacious. From the living area, you access the kitchen, bedroom, and bath with minimal walls and circulation loss.
Bedroom & Bathroom
The single bedroom fits comfortably and connects conveniently to the full bathroom. The design seeks to minimize hallway waste, so the bath is placed adjacent to both the bedroom and main living areas for efficiency.
Living & Dining Spaces
The vaulted living room is the heart of the ADU. Its peak height draws your eyes upward, making the space feel larger than its footprint. Windows on one or more walls bring daylight deep into the plan. The dining area is integrated or nearby, likely adjacent to the kitchen for fluid movement.
Kitchen Features
The kitchen is compact and functional, laid out to support prep, cooking, and storage without excess. Counters and cabinetry are proportioned to the scale of the home. Sightlines keep the cook connected to the living room.
Outdoor Access & Relationship
Although the plan is small, the design probably includes a modest entry porch or small deck to provide transition between inside and outdoor. Large windows help blur the boundary and bring nature indoors.
Storage & Utility
Closets in the bedroom, cabinetry in the kitchen, and possibly built-ins or niches in the living room handle storage within the tight footprint. The utility zone (mechanical, HVAC, water heater) is tucked away as compactly as possible to preserve usable area.
Construction & Efficiency Notes
Given the compact size, the ADU leverages the vaulted ceiling to add spatial drama without expanding the footprint. Exterior walls may use 2×4 framing, though a 2×6 upgrade is beneficial for insulation and energy performance. A simple roof geometry keeps structural complexity and cost in check.
Because everything is clustered—living, kitchen, bath, and bedroom—the plumbing, electrical, and HVAC runs stay short, reducing material and labor cost. The minimal envelope area further enhances thermal efficiency.
Estimated Building Cost
The estimated cost to build this ADU in the United States ranges between $90,000 – $160,000, depending on region, finishes, site work, and labor.
Why This ADU Cottage Is Smart
For those needing a small dwelling—guest house, rental, granny suite, or starter cottage—this plan offers a lofted sense of openness and smart efficiency. The vaulted living pulls double duty: it feels generous while keeping the layout compact and cost-effective.
This one-bedroom ADU achieves a balance of charm, utility, and economy. It’s a great solution for projects where land is limited but a full living experience remains desired.
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