Mountain View / Accessory dwelling units
ADU Builder in Mountain View
Mountain View does not ask for a separate planning permit for an ADU or JADU. A building permit is still required before construction. R&B Master Construction Inc. (CSLB #1158657) reviews Mountain View lots from the Cupertino office at 10080 N Wolfe Road, Suite SW3-200, Cupertino, CA 95014. Call (650) 562-6324.
A building permit, without a separate planning permit
The Santa Clara County ADU Collaborative summary for Mountain View, updated October 1, 2025, says no separate planning permit is required for ADUs and JADUs. You still need a building permit. Planning recommends an informal preliminary review before detailed plans. Building permits go through the City ePermits system. Questions about the current steps go to Planning at planning.division@mountainview.gov.
The same summary says multi-department comments come about two weeks after submittal. That is a City review note, not a construction schedule. The ADU also needs a Building Address Assignment. When permitting is in the contracted scope, we coordinate the drawings and the City submittal from the Cupertino office.
Single-family size, setback, and parking notes
On single-family sites, that Collaborative summary lists one-bedroom or fewer ADUs up to 800 square feet, two-or-more-bedroom ADUs up to 1,000 square feet, and JADUs capped at 500 square feet. A single-family site may have one ADU plus one JADU. Detached ADUs generally need a 4-foot side and rear setback. The front setback follows the zoning district. A conversion, or a rebuild in the same footprint, can keep an existing sub-4-foot setback when the City conversion rules are met.
Studios on single-family sites typically need no ADU parking. A one-bedroom or larger ADU generally needs one space, with listed exceptions such as transit within a half-mile walk, some conversions, historic-district cases, and car-share proximity. The summary says replacement parking is not required when a garage or carport is demolished or converted for an ADU. Confirm Chapter 36 and the live City page for the parcel before drawings freeze.
ADU Builder in Mountain View — FAQ
Do Mountain View ADUs need a planning permit?
No separate planning permit is required for ADUs and JADUs in Mountain View; you still need a building permit before construction. Planning recommends an informal preliminary review before detailed plans. Submit building permits through the City ePermits system. Confirm current steps with Planning at planning.division@mountainview.gov. R&B Master Construction Inc. (CSLB #1158657) can discuss your Mountain View lot — call (650) 562-6324 or email info@rbmasterconstruction.com.
What sizes does Mountain View allow for ADUs and JADUs?
On single-family sites, Mountain View standards summarized by the Santa Clara County ADU Collaborative (updated October 1, 2025) list one-bedroom or fewer ADUs up to 800 square feet and two-or-more-bedroom ADUs up to 1,000 square feet, with JADUs capped at 500 square feet. Single-family sites may have one ADU plus one JADU. Verify the live City page and Municipal Code Chapter 36 before design lock-in.
What setbacks apply to a new detached Mountain View ADU?
Detached ADUs generally need a minimum 4-foot side and rear setback; the front setback follows the underlying zoning district. Conversions of existing accessory structures, or rebuilding in the same footprint after demolition, can keep existing sub-4-foot setbacks when the City’s conversion rules are met. R&B confirms setbacks on a parcel review before drawings freeze.
Does Mountain View require parking for every ADU?
For single-family sites, studios typically need no ADU parking; one-bedroom or larger ADUs generally need one space, with listed exceptions such as being within one-half mile walking distance of public transit, certain conversions, historic-district cases, and car-share proximity. No replacement parking is required when a garage or carport is demolished or converted for an ADU. Confirm exceptions for your address with Planning.
How do I start a Mountain View ADU permit with the City?
Check zoning and standards with Planning first, then prepare complete building plans and apply at mountainview.gov ePermitsMV. The City notes multi-department comments about two weeks after submittal. You will also need Building Address Assignment for the ADU. When permitting is in R&B’s contracted scope, we coordinate drawings and City submittals — info@rbmasterconstruction.com or (650) 562-6324.
Official sources
City rules change. The links below are the pages and documents these notes were checked against. Your address can still differ.
Talk with R&B
R&B Master Construction Inc. · CSLB #1158657. Email info@rbmasterconstruction.com. Headquarters: 84 W Santa Clara St, Suite 700, San Jose, CA 95113. Hours: Monday–Sunday, Open 24 hours Pacific Time.