ADU Design Resource · Redlands, CA
The Complete Guide to
Building an ADU in Redlands, CA
Everything Redlands homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Permit-ready drawings (more below)
Quick Answers About Redlands, CA ADUs
Market Context
Redlands has a median home value of $560,000. Adding an ADU typically increases that by 23% — approximately $128,800 in added equity. A 1-bedroom ADU in Redlands rents for approximately $1,895/month in the San Bernardino County rental market , yielding a 3.8% cap rate on the investment. Occupancy averages 96% in this market.
Top Redlands neighborhoods for ADU investment include Downtown Redlands & Historic District, Smiley Heights, South Redlands, Redlands Country Club Area, University Neighborhood (south of U of Redlands). ADUs are permitted by-right under the Transit Villages Specific Plan, lots are ~7,000 sq ft, walkable to downtown jobs, restaurants, and a 0.5-mile transit exemption waives parking requirements, fueling strong studio/1-bed rental demand. Custom luxury estates on oversized lots with mature landscaping offer rare room for large detached ADUs while remaining minutes from downtown, the University of Redlands, and Redlands Community Hospital.
Permit Process
Permit applications are reviewed by the Development Services Department . Permit fees in Redlands range from $9,500 to $18,000 depending on project scope. Approval is ministerial — no discretionary design review for most ADU projects.
If your property is near an orange grove or within an agricultural buffer zone, you may face additional requirements for setbacks and pest mitigation, which can affect your ADU's placement and increase costs for landscape barriers. Additionally, Redlands requires homeowners to upgrade water meters to a larger size for detached ADUs with bathrooms, which can cost $6,000–$10,000 depending on the location and trenching needs.
"In my experience with Redlands submittals, that missing timeline and cost-per-square-foot figure are really just placeholders where a Redlands state-level estimate should be — I'd call the Development Services Department directly and get two or three local contractor quotes before penciling in a budget or start date. With no HOA data pointing to over a third of neighborhoods having restrictions, I've also seen well-intentioned ADU plans stall for months simply because a homeowner didn't check their CC&Rs first."
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Redlands's building department records and current 2026 California ADU law.
Property Eligibility
Is My Redlands, CA Property Eligible for an ADU?
Redlands homeowners are governed by California state ADU law (AB 2221 and SB 897). Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Redlands under California state ADU law (AB 2221 and SB 897). No owner-occupancy requirement in Redlands — you can rent both units as investment properties. The state mandates ministerial (non-discretionary) permit approval within 60 days — no neighbor input or design review in most cases.
Multi-Family Property
Up to 2 detached ADUs plus JADUs (Junior ADUs) within the existing main structure are permitted under California state law. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 36% of Redlands homes are in an HOA. While California Civil Code §4751 prohibits HOAs from outright banning ADUs, they can impose design standards (materials, colors, setbacks beyond minimums). Our drawings include HOA submission formatting.
Always verify eligibility with Development Services Department before designing.
Free — No Obligation
Will Redlands Approve an ADU on Your Lot?
Send us the address and we’ll check it against Redlands’s current zoning, setbacks, and lot-coverage rules — then tell you honestly whether to proceed. Free, and no payment is taken unless your property qualifies.
- ✓Lot qualification against current Redlands code
- ✓Your buildable envelope — setbacks and maximum footprint
- ✓Realistic rental income and payback estimate
- ✓Financing pathways you’d likely qualify for
- ✓A straight GO / NO-GO answer within 48 hours
Check My Property — Free
Takes 60 seconds. We'll deliver your personalized report within 48 hours.
Request Received
Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
Free Tool · No Email Required
Redlands ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Redlands construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. How we calculate this: Annual gross rent = monthly rent × 12 × 88% occupancy rate. Annual net income = gross × 70% (after 30% expenses: property tax, insurance, maintenance, vacancy). Value added = median home value × 23% uplift (California ADU comparables). Total return = net income × years + value added. Break-even = total build cost ÷ annual net income. Consult a licensed financial advisor before investing.
Data sources: Development Services Department (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-08-15.
Local Market Data
Top Redlands Neighborhoods for ADU Investment
Downtown Redlands & Historic District
ADUs are permitted by-right under the Transit Villages Specific Plan, lots are ~7,000 sq ft, walkable to downtown jobs, restaurants, and a 0.5-mile transit exemption waives parking requirements, fueling strong studio/1-bed rental demand.
Smiley Heights
Custom luxury estates on oversized lots with mature landscaping offer rare room for large detached ADUs while remaining minutes from downtown, the University of Redlands, and Redlands Community Hospital.
South Redlands
Historic, well-preserved large-lot estates near Prospect Park and downtown generate strong executive/family rental demand and easily accommodate detached ADUs in generous rear yards.
Redlands Country Club Area
Sprawling 2,500-5,000+ sq ft custom homes on expansive lots provide ample rear-yard space for premium detached ADUs targeting professionals commuting to Loma Linda medical corridor.
University Neighborhood (south of U of Redlands)
Walking distance to the University of Redlands campus drives constant student and faculty rental demand; mature single-family blocks have the lot depth needed for detached ADUs.
University Village
Family-oriented single-family enclave bordering the University of Redlands with strong, sustained rental demand from university staff, students, and hospital workers.
North Redlands
Denser single-family area with smaller, more affordable lots near the city's growth corridor - well suited to attached ADU conversions and JADUs at entry-level price points.
The Grove
Newer-construction single-family subdivision with consistent lot sizes, top-rated schools, and young-family demographics ideal for granny-flat/ADU multigenerational housing.
West Redlands
Quiet, single-family-dominated area close to downtown and the I-10 commute corridor lends itself to ADUs targeting traveling nurses and commuter professionals.
Live Oak Canyon
Semi-rural, large-lot single-family properties near canyon trails offer rare opportunity for sizable detached ADUs serving tenants who want space without leaving Redlands.
Redlands ADU Market at a Glance
Local Zoning Rules
2026 Redlands ADU Rules
Redlands's 2026 ADU ordinance caps new units at 1,200 sq ft and 25 ft of height — in the typical range most ADU floor plans are designed around. Setbacks run 4 ft side and 4 ft rear, close to the regional baseline. Because of Redlands's Seismic Design Category D classification, structural drawings for a detached ADU here need a licensed engineer's stamp — architectural sheets for a code-compliant unit under the size cap generally don't.
Permit fees run $9,500–$18,000 — among the higher permit costs we track through Development Services Department. Submit directly to the department online — link below.
| Regulation | Redlands Allowance |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Max Height | 25 ft |
| Side Setback | 4 ft |
| Rear Setback | 4 ft |
| Architect / Engineer Stamp | Required for structural — Redlands's Seismic Design Category D classification |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | No |
| HOA Prevalence | 36% of properties |
| Permit Fees | $9,500–$18,000 |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-08-15T06:10:50.038Z. Always confirm with the Development Services Department before designing.
Redlands Permit Process
Redlands ADU Permit Timeline & Fees
Local Financing Resources
Local ADU Lenders in Redlands
These lenders offer HELOC, construction, and renovation loans for ADU projects in San Bernardino County. Compare terms before committing.
Headquartered in Redlands (1580 Industrial Park Ave); HELOC APR as low as 7.75%, Home Equity Loan APR as low as 7.25%, borrow up to 80% of home equity — usable to fund an ADU build.
Visit Lender ↗Inland Empire credit union serving the Redlands/San Bernardino area; offers HELOC and fixed Home Equity Loans with financing up to 80% LTV and terms up to 15 years.
Visit Lender ↗Has a Redlands, CA branch and serves Southern California; HELOC intro fixed APR 4.99% for first 6 months then variable, Home Equity Loans as low as 6.875% APR — funds can be used for ADU construction.
Visit Lender ↗California-wide credit union offering home equity loans/HELOC $10,000–$500,000, financing up to 80% of home equity, up to 15-year terms — can be drawn for ADU projects.
Visit Lender ↗Specialty ADU/renovation lender platform operating in California (NMLS #2412747); uses after-completion value to qualify renovation loans with up to 20-year terms — partners with credit unions to fund Redlands/Inland Empire ADU projects (not a direct lender).
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Redlands
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Redlands ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Development Services Department.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
Quoted on your free call
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Development Services Department. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Redlands ADU Package
Engineered for CA Permit Approvals
What You Get
Redlands ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Redlands:
| Service Type | Typical Cost | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Standard | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Premium | Quoted on your free call | 5 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Redlands ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. One flat fee — about what an architect charges just to start. Yours would rent around $1,895/mo.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Redlands's building department requirements and CA code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Development Services Department. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three representative project scenarios based on actual drawing packages delivered in California cities with similar market conditions to Redlands.
Build costs reflect local construction data for Redlands. Client names are initials only. Permit timelines are project-specific and may vary.
"Drawings were ready on day 9. I submitted to the city the same week. The reviewer called them the cleanest ADU set he'd seen in months."
"Our garage conversion is now renting at $1,850/month. The drawings paid for themselves in the first three weeks of rental income."
"Our JADU was the easiest part of the whole project. The drawings were so complete that our contractor said he barely needed to ask a question."
Representative scenarios. Build costs modeled using Redlands construction data (city-verified data) and Development Services Department. Outcomes vary by project scope and site conditions.
Building Code
Redlands Climate Zone & Energy Code
ADUs in California must comply with the Title 24 Building Energy Efficiency Standards (Part 6), including prescriptive or performance-method compliance for insulation, HVAC, lighting, and envelope tightness; newly constructed detached ADUs also require newly installed solar PV (with limited exceptions) and must be battery-energy-storage-system (BESS) ready, while attached ADUs are treated as additions and follow the applicable exception paths in Section 150.2(b)1K.
Compare Cities
Redlands vs. Nearby California Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Eligibility |
|---|---|---|---|---|---|
| Redlands ← you | — | $9,500+ | $1,895/mo | 3.8% | Free check → |
| San Bernardino | $300 | $3,500+ | $1,495/mo | 3.9% | View → |
| Fontana | $325 | $1,447+ | $1,837/mo | 4.4% | View → |
| Ontario | $300 | $15,442+ | $1,934/mo | 4.8% | View → |
| Rancho Cucamonga | $250 | $3,500+ | $2,148/mo | 4.2% | View → |
Frequently Asked
Redlands ADU Questions
How much does it cost to build an ADU in Redlands? +
What is the maximum ADU size allowed in Redlands? +
How long does the ADU permit process take in Redlands? +
Do I need owner-occupancy to build an ADU in Redlands? +
What's the rental income potential for an ADU in Redlands? +
How much does it cost to get ADU drawings in Redlands? +
What drawings are required for an ADU permit in Redlands? +
Can I convert my garage to an ADU in Redlands? +
What neighborhoods in Redlands are best for ADU investment? +
Is Redlands ADU-friendly? +
How much will an ADU increase my property value in Redlands? +
Can I use my Redlands ADU as a short-term rental (Airbnb / VRBO)? +
Redlands has a high HOA rate (36%) — do I need HOA approval for an ADU? +
Does Redlands's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Redlands? +
More Services in Redlands
Free · No Obligation
Not Sure If Your Redlands Lot Qualifies?
Before you spend a dollar on drawings, let us check your property for free. We'll tell you honestly whether your Redlands lot supports an ADU, what it could rent for, and what to do next — no pressure, no sales pitch.
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