1 Bedroom ADU Floor Plans That Bring Function to Limited Spaces

Most 1 bedroom ADU floor plans land between 600 and 800 square feet. That's not a lot of room, and small decisions like where the bath sits and how the kitchen flows into the living area shape the daily experience more than any finish choice. The four plans below all share a 28' by 24' footprint, 672 square feet total.

Four 1 bedroom ADU floor plans to compare

These ADU 1 bedroom floor plans share the same 672 square foot footprint but treat program and circulation in very different ways.

1 bedroom ADU floor plan with kitchen and bedroom up front

This ADU’s bedroom occupies the upper left of the unit, the kitchen runs along the upper right wall, and the bathroom and a small closet sit at the lower left. The living room takes the lower right corner with the main entry on the south wall.

There's no dedicated laundry, and the closet opens off the hallway rather than into the bedroom. The kitchen is also a single counter run without a peninsula. None of this is a dealbreaker. A stacked washer-dryer can tuck into the closet or replace a section of the bathroom wall if laundry becomes a priority later.

ADU 1 bedroom floor plan with laundry and walk-in closet

This is the most feature-complete 1-bedroom ADU plan of the set. The bedroom and bathroom share the top edge of the unit with a dedicated laundry room at the right corner. The living room sits in the center, with the kitchen and dining area taking the lower right and a walk-in closet in the lower left. For 672 square feet, that's a lot of program to fit.

The laundry room is the standout. Most 1 bedroom ADU plans skip it entirely or hide a stackable unit in a closet, but this layout commits real square footage to a proper utility space. Anyone living here long-term, or renting it as a permanent residence rather than a short-stay, will notice the difference every week.

The walk-in closet placement is the most debatable choice. It sits off the living room rather than off the bedroom, which keeps the bedroom footprint cleaner but means you cross the main living area to get dressed. The bigger, quieter bedroom is the trade you get for the walk, and most floor plans put the closet inside the bedroom for a reason.

The bathroom carries a double vanity, which makes sense when two people share the unit and want to get ready at the same time. For a solo occupant, that counter space could go to a linen closet or a wider shower.

1 bedroom ADU layout with a covered front porch

The pitch here is the covered front porch on the upper right, which connects to the kitchen and living area through a wide opening. In a temperate climate, that porch effectively extends the living room outward for most of the year. Coffee outside in the morning, doors thrown open through dinner. If the ADU sits on a lot with a view or a garden worth looking at, the porch is the whole reason to choose this plan.

The bedroom, bathroom, and closet occupy the lower portion of the floor plan. The kitchen wraps around in an L-shape along the upper left wall, with the dining table tucked into the middle of the room.

Pulling the porch inside the 28' by 24' footprint means the conditioned interior shrinks to roughly 540 square feet, so every room feels a little tighter than it would in the other plans. No laundry is shown either, though a stackable could fit inside the closet between the bath and the bedroom.

1 bedroom ADU floor plan with a dedicated office

This one's built around an office, fulfilling a need the other 1-bedroom ADU layouts don’t. However, if you don't work from home, the same room makes a fine nursery or guest room with a daybed.

The top half of the unit splits into three rooms: bedroom on the left, bathroom in the middle, and the office on the right. The lower half opens up into a combined living and kitchen-dining area, with a peninsula that doubles as casual seating and a clear sight line from the sofa to the cooking zone.

The bedroom doesn't have a built-in closet (the plan shows a wall of dressers handling that role), and there's no laundry footprint. Both are fixable with minor adjustments, but get them into the contractor's scope before framing rather than after.

Checklist of what to include in your 1 bedroom ADU

• Bedroom egress window sized to local code. Most jurisdictions require a minimum clear opening of 5.7 square feet, with the sill no higher than 44 inches from the floor. There are also minimum width and height dimensions, typically 20 inches by 24 inches. The egress window is a fire safety requirement, not a nice-to-have, and a missing or undersized one is among the most common reasons an ADU fails inspection. Confirm the exact numbers with your local building department before the framing scope is locked in.
• Laundry hookup, even if you don't install the washer-dryer right away. A 30 inch wide closet for a stackable unit is the smallest practical footprint, and roughing in the plumbing and 240V electrical now costs a fraction of what it will cost to retrofit later.
• A bedroom closet sized for the actual occupant. A 5 to 6 foot reach-in handles most needs; a walk-in is a real tradeoff against bedroom square footage in a unit this size.
• A utility closet for cleaning supplies and the vacuum. Easy to forget at the plan stage and painful to live without, and 24 inches of width near the bath or kitchen is enough to fix the problem.
• A kitchen counter run of at least 8 to 10 linear feet. Include a clear landing zone next to the cooktop and the sink, since cooking in a 1 bedroom ADU is harder than it needs to be when there's nowhere to set down a hot pan.
• Mechanical and electrical placement, decided early. The electrical panel needs 36 inches of clear working space in front of it and tends to end up squeezed into a closet where that's hard to provide. Mini-split heads and the tankless water heater have their own wall-space requirements that get harder to solve once framing has started.
• An entry transition zone, even if it's only 3 by 4 feet. Without one, the rest of the living room turns into a drop zone for everything that comes through the door.
• A bathroom layout that accounts for door swing and fixture clearance. Code typically requires a 21 inch clearance in front of each fixture, but 30 inches is the minimum that actually feels comfortable to use. Walk the floor plan in your head before signing off, because a bathroom that's awkward on paper will be awkward every single day.
• Outdoor access from the main living space. A sliding door to a patio or a French door to a deck makes a small unit feel significantly larger, and on a tight lot the doorway itself functions as a window.

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What a 1 bedroom ADU actually runs

Building a 1 bedroom ADU like the ones above runs $170,000 to $335,000 in most markets, with the typical detached new build landing between $230,000 and $300,000 for 672 square feet. Coastal California and the New York metro run 30 to 50 percent higher, putting detached new builds there in the $400,000 to $500,000+ range.

Take note, the 1-bedroom ADU’s build type and region drive most of it, with site conditions and finishes filling in the rest. The same 672 square foot footprint can come in under $150,000 as a garage conversion in a more affordable market.

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