Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Chino
Most homeowners in Chino start asking the same question once the family grows or the in-laws need a place nearby: can we add on, or are we better off building an ADU? In Chino, the answer usually comes down to your lot size, the age of your home, and what the soil under your slab can handle. Home additions in Chino run $45,000 to $130,000, while a new detached ADU typically lands between $90,000 and $220,000 depending on square footage and site prep. Call Barrett & Sons Construction at (877) 610-1318 for a free estimate, and we’ll walk your property with you before you sign anything.
Why Barrett & Sons Construction Is Chino’s Preferred Home Additions & ADU Company
We’re not a franchise dispatching strangers to your door. Tom Barrett started this company in 1998, and his sons run the crews that work in Chino every week. When you call, a live person answers at (877) 610-1318, not a voicemail box or an out-of-state call center.
What our Chino customers tell us they appreciate most is the paperwork. Every scope goes in writing. Every allowance goes in writing. Every price change arrives as a written change order before a single nail moves. The permit inspector works for you, not for us, and we like it that way: permits pulled and inspections signed on every eligible job. Tom publishes his name, his address, and his license number. Look it up before you sign anything. Our 90-Day Done Right Promise is written on every contract, and it means what it says: if something’s not done right, one call brings Tom back.
Our Home Additions & ADU Services in Chino
ADU Design & Permitting
Chino’s planning department has seen a flood of ADU applications since the state eased the rules, and the process moves faster when the drawings are right the first time. We handle the design, the engineering, and the permit package for your Chino property, including the Title 24 energy calculations that stymie first-timers. On older lots along Central Avenue, we also check for the setback quirks and utility easements that can quietly kill a project. For a deeper dive into what’s involved, our Home Additions & ADU team keeps a full checklist of what Chino homeowners should ask before breaking ground.
Garage Conversion ADU
A garage conversion in Chino typically runs $30,000 to $80,000, which makes it the most affordable path to a rentable unit or a private space for family. The catch is that many of the 1960s and 1970s ranch homes near Chino’s older core have slab garages that were never engineered for habitable space. We pull the permits, bring the floor up to code, and handle the insulation and HVAC work that turns a car bay into a comfortable apartment. If you’re also thinking about updating the main house while we’re there, we handle Kitchen Remodeling in Chino too.
New Detached ADU
On the former dairy parcels in The Preserve and the newer subdivisions in the south of Chino, a detached ADU often makes more sense than an attached addition. The Hanford-Tujunga clay loam under much of that ground swells and shrinks with every season, so we spec post-tension slab foundations and engineered fill reports from day one. Chino contractors who skip that step end up eating change orders. A new detached ADU in Chino runs $90,000 to $220,000, and the final number depends heavily on whether utilities need to be trenched across the lot.
Junior ADU & Interior Conversion
Chino’s housing stock has a lot of finished basements-turned-rec-rooms and oversized laundry rooms that can become a Junior ADU without adding a single square foot to the roofline. These conversions are the fastest permitted projects in Chino, often $45,000 to $90,000 depending on whether you need a separate entrance and a kitchenette. For homeowners who’d rather invest inside the main house first, we also do Bathroom Remodeling in Chino and can sequence the work so you’re not living in a construction zone for months.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Chino
We don’t hide behind mystery brands off a van. On Chino ADU and addition jobs, you’ll see names like Schluter in the wet areas, Sterling fixtures in the bathroom, and GAF underlayment on any new roof sections we tie into. Those are names you can look up, and we stock the parts locally so a warranty call doesn’t turn into a six-week wait. If you’re comparing bids from other Chino contractors, ask them what brand of membrane they’re putting behind the shower tile. You’ll find out quickly who builds to the same standard Tom holds his crews to.
Common Home Additions & ADU Problems We See in Chino Homes
- Clay soil under the new addition. The expansive Hanford-Tujunga clay loam across Chino’s former dairy land swells and shrinks with seasonal moisture. A standard slab on this soil cracks; a post-tension slab with a proper engineered fill report does not.
- Santa Ana wind stress on new exterior work. Chino’s Santa Ana events push dust and debris into fresh stucco and sealant work, and they can accelerate concrete curing unpredictably. We schedule exterior finishes around the wind forecast when the calendar allows.
- Thermal cycling on older ranch homes. The 1950s through 1980s stucco homes near Central Avenue see 30 to 40 degree temperature swings in a single day during the inland basin summers. That cycling cracks stucco and degrades caulk joints faster than anything a coastal contractor ever deals with.
- Utility trenching across large lots. On Chino’s newer south-side parcels, running water, sewer, and electrical to a detached ADU often means trenching 100 feet or more across compacted former agricultural ground. We bid that work accurately the first time so you’re not surprised by a change order at the end of the job.
Pricing for Home Additions & ADU in Chino, CA
We Also Serve Cities Near Chino
Barrett & Sons Construction covers all of Chino, including 91708 and 91710, and we regularly work in Chino Hills, Los Serranos, Ontario, and Montclair. If you’re just across the city line, the trip charge rule still applies: no trip charge inside the county, and the same written estimate comes with it.
Serving Chino, CA - Our Local Coverage Area
We’re based in the Chino area and know this community well, offering Chino Roofing services to local homeowners. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Chino
How much does a home addition or ADU cost in Chino?
A home addition in Chino runs $45,000 to $130,000, a garage conversion ADU runs $30,000 to $80,000, and a new detached ADU runs $90,000 to $220,000. The biggest variables for Chino specifically are soil conditions on former dairy land and how far utilities need to be trenched. Call (877) 610-1318 and we’ll give you a written, line-item quote for your exact address.
Do you serve all of Chino, including The Preserve and the older neighborhoods near Central Avenue?
Yes. We work throughout Chino, including 91708 and 91710, from the older ranch homes near Central Avenue to the new construction at The Preserve and the south side. Each area has different soil and permit considerations, and we know the difference before we walk on site.
Will the price change once the work starts?
Not without your signature. Every scope, every allowance, and every price change at Barrett & Sons arrives as a written change order before the work happens. If it’s not on paper, it’s a surprise waiting for a date, and Tom doesn’t work that way. Call (877) 610-1318 for a free estimate and you’ll see exactly what we mean.
Do you pull the permits for home additions and ADUs in Chino?
Yes, on every eligible job. Chino requires permits and inspections for additions and ADUs, and we pull them before we start. The permit inspector works for you, not for us, and that’s exactly how we like it. We also handle the Title 24 energy calculations and any soil reports the city requires for your lot.
How long does an ADU or home addition take in Chino?
Most garage conversions in Chino run 3 to 5 months from permit to final inspection, while a new detached ADU or full addition typically runs 6 to 12 months depending on square footage, soil work, and utility trenching. We give you a written schedule with every contract, and we update you at every inspection. Call (877) 610-1318 to get a timeline for your specific project.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Chino and the Inland Empire since 1998.