Detached ADU Construction in Palo Alto
Full design-build of a standalone backyard home — foundation to final finish — on your Palo Alto lot.
A Complete Standalone Home in Your Backyard
A detached ADU is the most flexible way to add real living space to a Palo Alto property — a fully independent home with its own kitchen, bathroom, and entrance, separate from your main house. It works as a rental unit, a home for aging parents or adult children, or a private guest house.
We handle the entire process as your general contractor: site evaluation, architectural design, structural engineering, City of Palo Alto permitting, and construction through final inspection. One team, one point of contact, from the first sketch to the certificate of occupancy.
- Full design-build under one contract — no juggling separate architects and builders
- Site evaluation for setbacks, utility access, and lot coverage
- City of Palo Alto plan check and permit management included
- Typical detached ADU: 400-1,200 sq ft, one or two bedrooms
Timeline and What to Expect
Most detached ADU projects in Palo Alto run 10 to 14 months from initial design to move-in, with permitting typically taking 3 to 5 months under California's streamlined ADU approval rules and construction running 6 to 9 months depending on size and site conditions.
We give you a firm, itemized proposal after the site visit so you know the real cost of your specific lot and design before committing.
Frequently Asked Questions
How much does a detached ADU cost in Palo Alto?
Most detached ADUs in Palo Alto run $180,000 to $400,000+ depending on size, finish level, and site conditions like utility distance and grading. We give a firm, itemized quote after a site visit — text us for a free consultation.
Do I need a permit to build a detached ADU?
Yes. Every detached ADU requires City of Palo Alto plan check and building permits. We manage the full permit package for you, from plans to final inspection.
Can I rent out a detached ADU?
Yes, under California and Palo Alto ADU rules, a detached ADU can be rented as a long-term rental. Short-term rental rules vary — we can walk you through current local restrictions.
How big can my ADU be?
California state law generally allows detached ADUs up to 1,200 sq ft (smaller lots may have different limits). We size the design to maximize what your specific lot allows.