ADU Regulations in Redlands, California
Everything you need to know about building an ADU in Redlands — size limits, setbacks, permits, and costs.
How many ADUs are allowed in Redlands?
- → 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. Redlands follows California AB 68 and subsequent ADU laws.
Redlands 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 | 800 sq ft (state minimum guaranteed; larger negotiable) |
| Setbacks | 4 ft side & rear (CA state baseline) |
| Height | 16 ft detached; 25 ft permitted under 2025 ordinance if 10 ft side setback from adjacent single-family property |
| 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) |
Redlands hired RRM Design Group to produce four pre-approved ADU plan sets — Craftsman, Ranch, Contemporary, and Mid-Century Modern — that homeowners can license at reduced cost and submit for expedited review. A 2025 ordinance update also allows 25 ft height with an expanded side setback, enabling two-story detached ADUs on qualifying lots.
Contact: Redlands Building & Safety Division
What could your Redlands 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 Redlands.
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 Redlands.
Redlands has the strongest ADU economics in the eastern Inland Empire. Average detached single-family home values in Redlands consistently rank in the top quartile of San Bernardino County, which translates directly into ADU appraisal lift and rental income strength. The University of Redlands, Loma Linda Medical Center, Esri's headquarters, and a thriving downtown all generate steady tenant demand for one- and two-bedroom backyard rentals. The 2025 height ordinance change is a quiet game-changer — homeowners on standard 7,500 sq ft lots can now plausibly build a two-story 1,200 sq ft detached ADU that fits the neighborhood scale without crowding. Combined with the city's pre-approved Craftsman, Ranch, Contemporary, and Mid-Century Modern plan sets, Redlands offers the fastest permit path of any Inland Empire city with strong design controls.
Ready to build an ADU in Redlands?
We’ll walk your lot, confirm what Redlands will allow, and ballpark cost before you commit to anything.
Redlands ADU questions, answered.
How much does an ADU cost in Redlands?
How long does it take to get an ADU permit in Redlands?
Can I rent my ADU in Redlands?
Do I need owner-occupancy for an ADU in Redlands?
Does Construction Station build ADUs in Redlands?
ADU regulations change frequently. Always verify current requirements with the Redlands Planning Department. This page was last updated May 2026.