Turn Your Backyard Into an ADU — Permits Handled, Built Right
Full-service ADU construction for Fontana, Rancho Cucamonga, Ontario, Rialto, and across the Inland Empire. Detached, attached, garage conversions, and JADUs — we handle design, permits, and construction.
Every Part, Handled Under One Roof
Full-service ADU construction for Fontana, Rancho Cucamonga, Ontario, Rialto, and across the Inland Empire. Detached, attached, garage conversions, and JADUs — we handle design, permits, and construction.
Detached ADUs
400–1,200 sq ft standalone units with their own address, utilities, and entrance.
Attached ADUs
Additions that share a wall with the main house — efficient and often faster to permit.
Garage Conversions
Convert an existing garage into a permitted legal ADU with full kitchen and bath.
JADUs (Junior ADUs)
Up to 500 sq ft within the existing home — the fastest and cheapest path to rental income.
Design & Permits
Full architectural plans, engineering, Title 24, and City of Fontana or county permit submissions.
Utilities & Site Work
New electrical panels, sewer taps, gas runs, concrete work, and landscaping cleanup.
ADUs We Design & Build
Detached studios, backyard cottages, and garage conversions — built to hold up as rentals for decades.
Why Inland Empire Homeowners Trust E-Z Contracting
We Handle the Paperwork
Title 24, soils reports, school fees, plan check — we navigate the full CA ADU code and Fontana requirements so you don’t have to.
Fixed-Price Contracts
Your ADU quote is locked in up front, with a clear allowance for finishes. No open-ended cost-plus billing.
One General Contractor
Design, framing, plumbing, electrical, HVAC, finishes — one license, one responsible party, one warranty.
Built for Long-Term Rental Income
We build to the same code and quality as a primary home so your ADU holds up as a rental for decades.
How It Works
A clear, no-surprises path from first call to finished job.
Free Feasibility Meeting
We walk your property, check setbacks and utilities, and tell you honestly what’s possible and what it costs.
Design & Fixed Quote
Preliminary plans, a written fixed-price quote, and a realistic timeline — typically within 2–3 weeks.
Permits & Plan Check
We submit to the City of Fontana or applicable jurisdiction and handle all corrections and revisions.
Construction & Final Sign-Off
Foundation to finish in 4–7 months typically, ending with final inspection and a written warranty.
Frequently Asked Questions
How much does an ADU cost in the Inland Empire?
Garage conversions typically run $110K–$170K. Attached ADUs $180K–$260K. Detached new-build ADUs $220K–$380K+ depending on size and finishes. Your fixed-price quote is always itemized.
How long does an ADU project take?
Design + permits: typically 3–5 months. Construction: 4–7 months. Total project: 7–12 months from signed contract to final inspection. Garage conversions can be faster.
Do I need permits?
Yes — every ADU requires permits in California. We handle all of it: Title 24, structural engineering, plan check, school fees, and inspections.
Can I rent the ADU out?
Yes. Under current California law, ADUs can be rented long-term. Short-term rental rules vary by city — we’ll tell you what’s allowed in Fontana or your jurisdiction.
Will the ADU add to my property taxes?
Yes — only the new ADU value is reassessed, not your entire property. We can connect you with a tax pro to run the numbers.
Do you offer financing?
Yes. We work with ADU-specific lenders, HELOCs, and cash-out refis. Ask at your free estimate.
Service Areas We Cover
Serving Fontana and surrounding Inland Empire cities. Tap your city for details on our work in your area.
See What Your ADU Could Look Like
Book your free feasibility meeting. We’ll walk the property, check setbacks and utility routes, and send a fixed-price proposal within 2 weeks.
CSLB #1140501 · ★★★★★ 5.0 on Google · Serving Fontana, Rancho Cucamonga, Ontario, Rialto & the Inland Empire