The Laguna, 450 sq ft One-Bedroom ADU Floor Plan

The Laguna at a glance

*Estimated 2026 range for a custom detached build at our published rates ($270–$380/sq ft). Final pricing depends on site conditions, panel, utilities, slope, access. Run your lot in the cost calculator.

How this plan lives

The Laguna exists because most Orange County lots are smaller than most ADU dreams. At 450 square feet it clears setbacks that kill bigger plans, and the layout spends every foot on living: an open main room, a real bedroom instead of a curtained alcove, a full bathroom, and a kitchen wall that handles actual cooking rather than gesturing at it.

Who rents a 450-foot unit? In our experience, one person with a good job who wants their own front door, a nurse, a grad student, a recently divorced parent restarting. The county-wide rent band for ADUs runs $2,000–$3,000 a month and compact one-bedrooms sit inside it comfortably, because the tenant is paying for privacy, not square footage.

On cost, small does not mean proportionally cheap, the kitchen and bathroom are the expensive rooms and every plan has them. But the Laguna is the least site-hungry plan we draw, and on constrained lots it is often the difference between an ADU and no ADU.

Where the Laguna sits against the rest of the range: the Balboa at 550 sq ft is the one to compare first, because on a lot that takes either, the extra hundred feet usually earns better rent and resale. Step up to the Tustin at 750 sq ft only if a second bedroom is genuinely needed, and note that 750 is the exact line where impact fees can begin. The Newport at 1,000 sq ft asks the most of the lot. All four sit in the full floor-plan comparison.