ADU Regulations in Colton, California
Everything you need to know about building an ADU in Colton — size limits, setbacks, permits, and costs.
How many ADUs are allowed in Colton?
- → 1 Detached ADU (up to 1,200 sq ft)
- → 1 Attached ADU
- → 1 Junior ADU / JADU (up to 500 sq ft)
- → Up to 8 detached ADUs
- → Interior conversions up to 25% of existing units
All California cities must follow state-law minimums. Colton follows California AB 68 and subsequent ADU laws.
Colton ADU rules & limits.
| ADUs Allowed | Up to 3 units on a single-family lot (primary home + 1 ADU + 1 JADU); up to 8 detached ADUs on multifamily lots |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Setbacks | 4 ft side & rear (CA state baseline) |
| Height | 16 ft detached |
| Parking | Not required in most cases; no replacement parking for garage conversions |
| JADU Allowed | Yes — up to 500 sq ft; owner-occupancy required if JADU is present |
| Impact Fees | Waived under 750 sq ft (state law) |
| Permit Timeline | 60 days maximum (state-mandated review window) |
Colton follows the California state ADU baseline. Some older neighborhoods have undersized lots that limit detached ADU placement, in which case garage conversion or attached ADU often becomes the better strategy.
Contact: Colton Building & Safety: (909) 370-5079
What could your Colton ADU earn?
Rental estimates based on current Inland Empire market rates. Actual rents vary by condition, amenities, and local demand.
Four paths to an ADU in Colton.
From idea to reveal.
Free Feasibility Consultation
We walk your lot, check setbacks and lot coverage, and confirm what your jurisdiction will approve.
Design & Engineering
Floor plan, elevations, structural calcs, and Title 24 energy compliance — drawn for your specific lot.
Permit Submission & Approval
We submit to your city or county, manage plan-check corrections, and pay the permit fees.
Construction
Same Construction Station crew handles foundation, framing, MEP, drywall, and finish — start to keys.
Final Inspection & Move-In Ready
Final city inspection, certificate of occupancy where applicable, and two-year workmanship warranty.
Why build an ADU in Colton.
Colton's central Inland Empire location is its biggest asset. The city sits within twenty minutes of San Bernardino, Riverside, Loma Linda, Redlands, and Rancho Cucamonga, which means an ADU here can be marketed to tenants working anywhere in the Inland Empire. Long-term rental demand is steady from Loma Linda Medical Center commuters, Stater Bros. distribution warehouse workers (the company is headquartered in San Bernardino but operates major facilities in Colton), and county government employees. Older neighborhoods often have larger garages — full two-car detached structures from the 1960s that are exceptional candidates for garage-conversion ADUs at 400–700 sq ft. Colton also tends to be quicker and less paperwork-heavy than San Bernardino on plan check, which shortens the construction timeline meaningfully for owner-occupants.
Ready to build an ADU in Colton?
We’ll walk your lot, confirm what Colton will allow, and ballpark cost before you commit to anything.
Colton ADU questions, answered.
How much does an ADU cost in Colton?
How long does it take to get an ADU permit in Colton?
Can I rent my ADU in Colton?
Do I need owner-occupancy for an ADU in Colton?
Does Construction Station build ADUs in Colton?
ADU regulations change frequently. Always verify current requirements with the Colton Planning Department at (909) 370-5079. This page was last updated May 2026.