What Bay Area Homeowners Should Know About ADU Permitting in 2026

Accessory dwelling units remain one of the most common projects we're asked about, and the permitting landscape around them keeps evolving. A quick update on what we're seeing across the Bay Area this year.

Local ordinances still vary widely

Even within neighboring jurisdictions, rules on setbacks, height, owner-occupancy, and impact fees differ meaningfully. The first conversation we have with any ADU client is about the specific lot and the specific jurisdiction — there is no single answer.

Pre-approved plans can help, with caveats

Several cities now offer pre-approved ADU programs that can shorten the planning phase. They're a real option for the right lot, but they aren't a shortcut around site work, utility connections, or soil conditions. We help clients weigh whether a pre-approved plan actually fits their property.

Start with the utility story

The single biggest schedule risk on an ADU isn't design review — it's utilities. Sewer lateral capacity, electrical service upgrades, and easements can all add weeks. We investigate those early so the timeline we commit to is the timeline we keep.