California ADU rules · Riverside County
Can I Build an ADU in Beaumont?
Yes — you can build an ADU in Beaumont. California's statewide ADU law requires every city, including Beaumont, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
CA state law1 ADU + 1 JADU
At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).
Units on a multifamily lot
Local ruleup to 2 detached; conversions up to 25% of units
Limits detached ADUs on multifamily lots to 2, less than the state default of 8.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
Local rule1,200 sq ft
1,200 sq ft for 2+ bedrooms; 850 sq ft for studio/1-bedroom. Conversion ADUs may exceed these limits.
Max attached ADU size
Local rule850 sq ft (studio/1-bedroom); 1,200 sq ft (2+ bedrooms)
Same as detached; conversion ADUs may exceed these limits.
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
Local rule0 ft
Height may exceed 16 ft if main unit is taller; capped at main unit height.
Setbacks
Side setback
Local rule4 ft
4 ft or the zone district setback, whichever is less.
Rear setback
Local rule4 ft
4 ft or the zone district setback, whichever is less.
Front setback
CA state lawNo front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 per ADU; JADUs exempt. Multiple local exemptions apply.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
CA state lawNot required
When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required for JADUs only.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
Local rulePlot plan approval, Building permit
Both plot plan approval and building permit required.
Beaumont-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Historic District
ADUs in historic districts are exempt from parking requirements.
Beaumont limits detached ADUs on multifamily lots to 2, below the state default, and sets specific size caps for both attached and detached ADUs (850/1,200 sq ft). Height may exceed 16 ft if the main home is taller. Plot plan approval is required in addition to a building permit.
Frequently asked questions
Can I build an ADU in Beaumont?
Yes. California's statewide ADU law requires Beaumont to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Beaumont?
A detached ADU of at least 1,200 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Beaumont?
Side and rear setbacks are limited to 4 ft. No front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone.
Is parking required for an ADU in Beaumont?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Beaumont?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Beaumont?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Beaumont Municipal Code Chapter 17.15 (Ord. No. 1149 & 1150, last amended 10-4-2022)
- Beaumont Municipal Code § 17.15.030(B)
- Beaumont Municipal Code § 17.15.060(A)
- Beaumont Municipal Code § 17.15.060(C)
- Beaumont Municipal Code § 17.15.060(B)
- Beaumont Municipal Code § 17.15.060(D), § 17.15.070(C)
- Beaumont Municipal Code § 17.15.070(A)
- Beaumont Municipal Code § 17.15.040(A)-(C)
- Beaumont Municipal Code § 17.15.060(D)(3)(b)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66314 (local ordinance standards)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-25. This is an AI-assisted summary of Beaumont's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Beaumont Planning before relying on it.
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