County directory

San Bernardino County ADU rules

Each place name links to that city or county's own ADU page. Places with a 'See our rules summary' button also have our plain-language summary of the local ADU rules, with sources. Each place below says whether we show local rules or California state rules.

Places in San Bernardino County

Adelanto (opens the government site in a new tab)See our rules summary
Showing California state rules, plus Adelanto details
The size, setback, height, and parking figures are California state rules. The Adelanto section lists the local details we have on file, like plans, forms, and contacts.
Apple Valley (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Apple Valley's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Apple Valley for local details.
Barstow (planning page) (opens the government site in a new tab)
Showing California state rules
We couldn't read this city's ADU code yet, so we're showing California state rules. Check with the city before you plan.
Planning page: https://www.barstowca.org/departments/community-development-department/planning
Big Bear Lake (planning page) (opens the government site in a new tab)
Showing California state rules
We couldn't read this city's ADU code yet, so we're showing California state rules. Check with the city before you plan.
Planning page: https://citybigbearlake.com/index.php/en/departments/community-economic-development/planning
Chino (opens the government site in a new tab)
Showing California state rules because Chino's local rules may conflict with state law or are being challenged
We show the state rules for a size cap, a one-ADU-and-one-junior-ADU limit, and owner-occupancy rules for junior ADUs. Check with Chino about how it handles this today.
Chino Hills (opens the government site in a new tab)See our rules summary
Showing Chino Hills city rules
These are Chino Hills's own ADU rules on file, shown with the California state rules they build on. Each item says which is which.
Where a Chino Hills rule may conflict with state law or is being challenged, we show the California state rule instead. This covers the one-ADU-and-one-junior-ADU limit, an ADU ineligibility district, building separation, and separate utility meters.
Colton (opens the government site in a new tab)
Showing California state rules because a local rule change is pending
A local rule change is pending. The City has been updating its ADU rules with a temporary (urgency) ordinance, and the adopted text could not be confirmed when this research summary was prepared. We'll add the new local rules after they take effect and we've reviewed them.
Fontana (opens the government site in a new tab)See our rules summary
Showing Fontana city rules
These are Fontana's own ADU rules on file, shown with the California state rules they build on. Each item says which is which.
Grand Terrace (planning page) (opens the government site in a new tab)
Showing California state rules
We couldn't read this city's ADU code yet, so we're showing California state rules. Check with the city before you plan.
Planning page: https://www.grandterrace-ca.gov/departments/planning_development_services/planning
Hesperia (opens the government site in a new tab)
Showing California state rules because Hesperia's local rules may conflict with state law or are being challenged
We show the state rules for a rule that the owner live in the main home. Check with Hesperia about how it handles this today.
Highland (opens the government site in a new tab)See our rules summary
Showing California state rules because a local rule change is pending
The size, setback, height, and parking figures are California state rules. The Highland section lists the local details we have on file, like plans, forms, and contacts.
Where a Highland rule may conflict with state law or is being challenged, we show the California state rule instead. This covers parts of the new ordinance, such as fire-zone and septic limits and a matching-materials rule.
A local rule change is pending. The city adopted a new ADU ordinance (Ordinance 485) that takes effect about November 12, 2026. We'll add the new local rules after they take effect and we've reviewed them.
Loma Linda (planning page) (opens the government site in a new tab)See our rules summary
Showing California state rules, plus Loma Linda details
The size, setback, height, and parking figures are California state rules. The Loma Linda section lists the local details we have on file, like plans, forms, and contacts.
Montclair (opens the government site in a new tab)
Showing California state rules because a local rule change is pending
A local rule change is pending. The City has posted a new ADU ordinance (Ordinance 25-1014), and the posted copy could not be read for this summary. We'll add the new local rules after they take effect and we've reviewed them.
Needles (planning page) (opens the government site in a new tab)
Showing California state rules
We couldn't read this city's ADU code yet, so we're showing California state rules. Check with the city before you plan.
Planning page: https://cityofneedles.com/city-code/
Ontario (opens the government site in a new tab)See our rules summary
Showing California state rules because Ontario's local rules may conflict with state law or are being challenged
The size, setback, height, and parking figures are California state rules. The Ontario section lists the local details we have on file, like plans, forms, and contacts.
Where a Ontario rule may conflict with state law or is being challenged, we show the California state rule instead. This covers the one-ADU-per-lot limit.
Rancho Cucamonga (opens the government site in a new tab)See our rules summary
Showing Rancho Cucamonga city rules
These are Rancho Cucamonga's own ADU rules on file, shown with the California state rules they build on. Each item says which is which.
Where a Rancho Cucamonga rule may conflict with state law or is being challenged, we show the California state rule instead. This covers a size cap for attached ADUs (50% of the home) without the 800 square foot minimum state law “guarantees”, minimum unit sizes larger than an efficiency unit, and an owner-occupancy rule for junior ADUs that also applies when the junior ADU has its own bathroom.
Redlands (opens the government site in a new tab)
Showing California state rules because Redlands's local rules may conflict with state law or are being challenged
We show the state rules for older 2003 and 2010 "second unit" rules still in its code, which a July 2025 state housing department letter says do not meet current state law (the City says it applies current state law to ADUs instead). Check with Redlands about how it handles this today.
Rialto (opens the government site in a new tab)
Showing California state rules because Rialto's local rules may conflict with state law or are being challenged
We show the state rules for a 16 ft height cap and a one-ADU-and-one-junior-ADU limit. Check with Rialto about how it handles this today.
San Bernardino (opens the government site in a new tab)See our rules summary
Showing California state rules, plus San Bernardino details
The size, setback, height, and parking figures are California state rules. The San Bernardino section lists the local details we have on file, like plans, forms, and contacts.
Twentynine Palms (code) (opens the government site in a new tab)
Showing California state rules
We couldn't read this city's ADU code yet, so we're showing California state rules. Check with the city before you plan.
City code: https://library.municode.com/ca/twentynine_palms/codes/code_of_ordinances
Upland (opens the government site in a new tab)See our rules summary
Showing Upland city rules
These are Upland's own ADU rules on file, shown with the California state rules they build on. Each item says which is which.
Where a Upland rule may conflict with state law or is being challenged, we show the California state rule instead. This covers how the city defines attached ADUs, ADUs on multifamily lots, and a deed restriction (raised in a 2025 state housing department letter).
Victorville (planning page) (opens the government site in a new tab)
Showing California state rules because a local rule change is pending
A local rule change is pending. The City adopted new ADU rules in September 2026 (Ordinance 2469), and the adopted text could not be fully reviewed for this summary. We'll add the new local rules after they take effect and we've reviewed them.
Yucaipa (opens the government site in a new tab)See our rules summary
Showing California state rules while we re-check Yucaipa's local rules
Yucca Valley (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Yucca Valley's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Yucca Valley for local details.
Unincorporated San Bernardino County (opens the government site in a new tab)See our rules summary
Showing California state rules, plus San Bernardino County details
The size, setback, height, and parking figures are California state rules. The San Bernardino County section lists the local details we have on file, like plans, forms, and contacts.

All counties in the ADU directory