ADU Builder · San Bernardino County

ADU Builder in Fontana, California

Custom-built ADUs across Fontana — from the roomy lots of North Fontana to established Southridge Village, designed and permitted by a team just up the 10 in Upland.

4.9 · 26 Google reviews
  • All-in pricing
  • Permits handled
  • Design & build in-house
ADU built by Backyard Estates in Fontana, CaliforniaBuilt in Fontana
0ADUs built in Fontana
  • 0+across San Bernardino County
  • 0+completed since 2020

Real local proof

ADUs we’ve built in & around Fontana

60+ completed ADUs across San Bernardino County — including projects near Fontana. Tap any for its floor plan, finishes, and timeline.

Loved by neighbors

What Fontana homeowners say

Juan

The best part was being able to sleep well at night, knowing I chose the right team.

JuanHomeowner · San Bernardino County

Watch their full story

The opportunity

What an ADU returns in Fontana

Turn underused backyard into monthly income and lasting value.

Estimated monthly rent

$0$0

per month, in Fontana

Typical value added

$0k$0k

added to your property

No hassle, just cash flow — we handle the design, permits, and construction end to end, so your Fontana backyard starts paying you back.

Estimates only — your exact rent, value, and price come from a free property analysis.

Your next step

See what’s possible at your Fontana address

Drop in your address and we’ll show you which ADUs fit your lot, what they’d cost all-in, and what they could earn — no pressure, no obligation.

  • Free, no-obligation
  • Specific to your Fontana parcel
Prefer to talk? Call (909) 500-0917
Timeline · Fontana

8.5months to a finished ADU.

The Fontana industry average is 22 months — we’re about faster.

Backyard Estates8.5 mo255 days
Industry average22 mo661 days
PlansPermitsConstruction

The biggest gap is construction — the industry averages 301 days; we clear it in 50.

Permits & fees

Red tape in Fontana, handled

Permitting an ADU touches a dozen departments and a stack of fees. We run every one — and it’s already in your fixed, all-in price.

Reviewed by the City of Fontana Planning Department

What California’s statewide ADU law means for your Fontana property:

  • California law requires ADU applications to be reviewed ministerially — without discretionary hearings — and acted on within 60 days, so a complete, code-compliant submittal moves through review predictably.
  • A detached ADU of up to 800 sq ft with 4-foot side and rear setbacks and up to 16 feet in height is allowed by right on virtually any eligible residential lot, with most lots accommodating units up to 1,200 sq ft.
  • No additional off-street parking can be required when the property is within a half-mile of public transit — relevant near Fontana's Metrolink station and major bus routes.
  • Owner-occupancy cannot be required for ADUs permitted through 2025, and Fontana also offers state-enabled pre-approved (AB 1332) standard ADU plans that can streamline review.

Every city fee — already in your price

No surprise municipal bills. We absorb every Fontana permit and city fee into one fixed, all-in price.

  • Permit & plan-check fees
  • School district fees
  • Utility hookups
  • Fire & public works
  • We run all ~11 city & county departments — plan check, building, fire, public works, utilities, and school fees.
  • Our Formal Property Analysis verifies 0+ property & city items — fire sprinklers, school & plan-check fees, lot coverage, Title 24 — before we build.

Specific setbacks, fees, and overlay rules are confirmed for your exact parcel during your free Formal Property Analysis.

Local know-how

Why homeowners build in Fontana

Fontana sits right in Backyard Estates' backyard — a quick run west on the 10 or 210 from our Upland headquarters, which means our designers and project managers are on your property in person, not coordinating from across the county. We've watched Fontana grow from its citrus-and-steel roots into one of the Inland Empire's largest cities, and that growth shows up in its neighborhoods: the newer master-planned tracts of North Fontana around the 92336 and 92337 ZIP codes tend to sit on generous, flat lots with real room in the rear yard, while established areas like Southridge Village offer the kind of deep parcels that take a detached granny flat beautifully.

Demand for accessory dwelling units here is driven by the things that make Fontana, Fontana. It's a city of large, multigenerational, family-oriented households, and an ADU is often the most graceful way to keep aging parents close or give adult kids a private start without leaving the block. It's also markedly more affordable than the coastal counties, so homeowners who bought smart are now adding rental income or a home office in the backyard rather than trading up. With Kaiser Permanente Fontana, the Auto Club Speedway, and the region's logistics corridors all drawing workers, a well-built second unit rents quickly and holds its value.

We handle Fontana ADUs end to end — site evaluation, design, structural engineering, the full permit submittal through the City, and construction — so you get one accountable team from first sketch to final inspection. We design to the lot, whether that's a Sierra Lakes home with HOA considerations, a hillside parcel near the Jurupa foothills, or a flat interior lot in Citrus Heights. Because we build throughout San Bernardino County every week, we know how Fontana's process actually moves, and we build a real backyard home that looks like it always belonged there.

Building throughout Fontana

North FontanaSouthridge VillageSierra LakesCitrus HeightsRancho Fontana

Good to know

Fontana ADU questions, answered

Most Fontana ADUs land in the low-to-mid six figures depending on size, finishes, and site conditions like sewer connection distance and grading on hillside lots. We give you a fixed, line-item proposal after evaluating your specific parcel — no vague per-square-foot guesses. Remember to budget for City plan check and development impact fees, which we itemize up front.

Yes. ADU applications are reviewed by the City of Fontana Planning Department, with building permits issued through Building & Safety via the Build Fontana online portal. Review is ministerial under state law and must be completed within 60 days of a complete submittal. We prepare and manage the entire package for you, including using Fontana's pre-approved standard ADU plans where they fit your goals.

Yes — you can rent a permitted ADU long-term, and there's no owner-occupancy requirement for units permitted through 2025. Fontana's diverse job base, from Kaiser Permanente to the logistics corridors, keeps demand for clean, separate backyard rentals strong. Short-term rentals under 30 days are treated differently, so we'll confirm current City rules for your situation.

Keep exploring

Nearby areas we build in

Get Started

Build your ADU in Fontana

Drop in your address and we'll show you what's possible on your lot, what it costs all-in, and what it could earn — no pressure.

See what’s possible