ADU Design Resource · San Bernardino, CA
The Complete Guide to
Building an ADU in San Bernardino, CA
Everything San Bernardino 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 · Drawings from $997 (more below)
Quick Answers About San Bernardino, CA ADUs
Market Context
San Bernardino has a median home value of $362,000. Adding an ADU typically increases that by 25.0% — approximately $90,500 in added equity. A 1-bedroom ADU in San Bernardino rents for approximately $1,495/month in the San Bernardino County rental market , yielding a 3.9% cap rate on the investment. Occupancy averages 97.0% in this market.
Top San Bernardino neighborhoods for ADU investment include Verdemont, Ridgeline, Arrowhead Farms, North Park, Kendall. Very large lots and higher home values make Verdemont ideal for detached ADUs and rentable units. Large-lot foothill neighborhood with space for detached ADUs and strong owner-occupancy rates.
Permit Process
Permit applications are reviewed by the Building & Safety Division , with a plan check timeline of approximately 8 weeks. Permit fees in San Bernardino range from $3,500 to $12,000 depending on project scope. Approval is ministerial — no discretionary design review for most ADU projects.
11 years in California residential permitting and ADU documentation. This guide was researched and verified against San Bernardino's building department records and current 2026 California ADU law.
Property Eligibility
Is My San Bernardino, CA Property Eligible for an ADU?
San Bernardino homeowners benefit from California's state ADU law — one of the most permissive frameworks in the country since 2020. Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in San Bernardino under California state law. No owner-occupancy requirement in San Bernardino — you can rent both units as investment properties. Ministerial permit approval — no neighbor input or discretionary design review.
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 31% of San Bernardino homes are in an HOA. California law (AB 670) prohibits HOAs from banning ADUs outright, but they can impose reasonable architectural standards. Our drawings include HOA submission formatting.
Always verify eligibility with Building & Safety Division before designing.
Free Tool · No Email Required
San Bernardino ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified San Bernardino construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. Assumes ~85% occupancy, ~30% expense ratio, 25.0% property value uplift. Consult a financial advisor before investing.
Data sources: San Bernardino Development Services Department, Zillow Rental Market Reports, local appraiser records. Last verified: 2026-05-30.
Local Market Data
Top San Bernardino Neighborhoods for ADU Investment
Verdemont
Very large lots and higher home values make Verdemont ideal for detached ADUs and rentable units.
Ridgeline
Large-lot foothill neighborhood with space for detached ADUs and strong owner-occupancy rates.
Arrowhead Farms
Suburban lots and family housing density support detached ADUs and long-term rentals.
North Park
Established single-family blocks near job corridors good for ADU rentals.
Kendall
High single-family home concentration and solid resale values support ADU investment.
Cimmeron
Mid-to-high median values and neighborhood lot patterns suitable for ADUs.
Hudson
Moderate-priced single-family areas with rental demand and ADU feasibility.
Cajon
Mix of lot sizes and proximity to regional corridors supports rental demand for ADUs.
Muscoy
Lower median values and larger lots in parts of Muscoy make conversion to ADUs economical.
University
Closest neighborhood to CSUSB with strong student rental demand for ADUs or JADUs.
San Bernardino ADU Market at a Glance
Local Zoning Rules
San Bernardino ADU Zoning Regulations
| Regulation | San Bernardino Allowance |
|---|---|
| Max ADU Size | 800 sq ft |
| Max Height | 16 ft |
| Side Setback | 4.0 ft |
| Rear Setback | 4.0 ft |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | No |
| HOA Prevalence | 31% of properties |
Data verified recently. Always confirm with the Building & Safety Division before designing.
San Bernardino Permit Process
San Bernardino ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on California state averages. Actual San Bernardino data coming soon.
Local Financing Resources
Local ADU Lenders in San Bernardino
These lenders offer HELOC, construction, and renovation loans for ADU projects in San Bernardino County. Compare terms before committing.
Offers home equity loans and HELOCs (fixed-rate home equity loan option); membership and underwriting required—serves San Bernardino area.
Visit Lender ↗Offers one-time-close construction-to-permanent loans and home equity/HELOC products—regional bank serving Southern California suitable for ADU construction financing.
Visit Lender ↗Renovation-specific lending platform that partners with credit unions nationwide to deliver renovation/ADU financing; has enabled thousands of renovation loans.
Visit Lender ↗Inland Empire CDFI providing factory-built ADU financing and local ADU loan/grant programs (program examples show ADU loans up to ~$200k and ADU grant support).
Visit Lender ↗Regional bank with branches in San Bernardino that offers home equity and construction lending products (home-equity/HELOC and construction loan capabilities).
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 San Bernardino
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 San Bernardino 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 Building & Safety Division.
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
$997 – $1,997
- ✓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 Building & Safety Division. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your San Bernardino ADU Package
Engineered for CA Permit Approvals
Transparent Pricing
San Bernardino ADU Drawing Costs — Compared
What homeowners typically pay for permit-ready ADU drawings in San Bernardino, by service type:
| Service Type | Price Range | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | $997 | 10 days | Standard |
| Build With A Plan · Standard | $1,497 | 10 days | Standard |
| Build With A Plan · Premium | $1,997 | 7 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy 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 7-day turnaround
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 San Bernardino'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 Building & Safety Division. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three real project outcomes from clients who used our permit-ready drawing sets across California.
"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."
Client first names and last initials only. Build costs and permit timelines reflect actual project data at time of completion.
Building Code
San Bernardino Climate Zone & Energy Code
ADUs in California must comply with the California Building Energy Efficiency Standards (Title 24, Part 6), meeting mandatory envelope, HVAC, lighting, and ventilation requirements, as well as 2022 code mandates for energy storage readiness and rooftop solar PV.
Compare Cities
San Bernardino vs. Nearby California Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Drawings |
|---|---|---|---|---|---|
| San Bernardino ← you | $300 | $3,500+ | $1,495/mo | 3.9% | From $997 |
| 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 → |
| Victorville | $400 | $3,500+ | $1,190/mo | 3.8% | View → |
Frequently Asked
San Bernardino ADU Questions
How much does it cost to build an ADU in San Bernardino? +
What is the maximum ADU size allowed in San Bernardino? +
How long does the ADU permit process take in San Bernardino? +
Do I need owner-occupancy to build an ADU in San Bernardino? +
What's the rental income potential for an ADU in San Bernardino? +
How much does it cost to get ADU drawings in San Bernardino? +
What drawings are included in the permit set? +
Can I convert my garage to an ADU in San Bernardino? +
What neighborhoods in San Bernardino are best for ADU investment? +
Is San Bernardino ADU-friendly? +
How much will an ADU increase my property value in San Bernardino? +
Can I use my San Bernardino ADU as a short-term rental (Airbnb / VRBO)? +
San Bernardino has a high HOA rate (31%) — do I need HOA approval for an ADU? +
Does San Bernardino's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in San Bernardino? +
More Services in San Bernardino
Start Your San Bernardino ADU Today
Permit-ready drawings from $997. Delivered in 10 business days. Designed for San Bernardino's building department. 14-day money-back guarantee.
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