Housable ADU Project Case Study:

Detached ADU in Millbrae, CA

Housable ADU Project Case Study:

Detached ADU in Millbrae, CA



Project Scope


Project Details
Completed Project
ADU Type:
New Construction
ADU Size:
1000 sqft, 3 bed, 3 bath
Project Location:
Millbrae, CA

Goal: The property owner wanted to add a 3 bedroom, 3 bathroom ADU.

Design Challenge: The ADU project was located in the AH flood zone and required the first floor elevation to sit above the base flood level.


Process and Solution: The customer chose to construct a 44’X24’ single story unit. The final ADU included three bedrooms, a separate living area, dining room, full kitchen, and three bathrooms all attached to their respective bedrooms.


Unique Project Traits: This project required a stormwater swale for runoff behind the new ADU and elevation above the base flood level because of the flood zone requirements.

Project Layout:

See an early ADU Design for the project below. Customers may provide mark ups to request changes and confirm information about their project throughout the process.

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