#1 ADU Contractor in Chino
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout Chino, managing everything from early design through permit approval with the City of Chino Building and Safety Division to final walkthrough. If your property sits within The Preserve, the former dairy ground on the south end, we work within that area’s specific plan and design guidelines from the start. We coordinate budgeting, material selection, and every licensed trade the project requires, so the build moves forward without gaps. Call us today to request a free estimate.
Services We Offer
How Our ADU Process Works
When it comes to enhancing your living space, room additions combined with Accessory Dwelling Unit (ADU) construction offer unparalleled versatility and value. These projects not only increase square footage but also provide additional living accommodations, whether for extended family, rental income, or work-from-home setups, making them a popular choice for homeowners seeking to maximize their property’s potential. According to California’s Department of Housing and Community Development, ADUs are a key solution to expanding housing options in urban and suburban neighborhoods.
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If you are planning to add a rental unit, house a family member, or create long-term value on your property, working with an experienced adu contractor in Chino means navigating a permit process and a body of state law that have both changed recently. California moved its ADU rules into Government Code sections 66310 through 66342 in 2024, and an update effective January 1, 2026 changed how square footage is measured, counting only interior livable space. Under the current law, the reviewing agency has 15 business days to determine whether an application is complete and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review.
For a Chino property, that application goes to the City of Chino Building and Safety Division. San Bernardino County adopted a new ADU chapter, Development Code Chapter 84.36, at the Board of Supervisors on January 13, 2026. The county’s published standards allow an ADU from 200 up to 1,200 square feet, a junior ADU up to 500 square feet, 25 feet of height for an attached unit and 18 feet for a detached one, with two additional feet permitted to match an existing roof pitch. Side and rear setbacks are four feet, with five feet of separation required between detached structures. Two ADUs per lot are permitted, and properties of five acres or more may carry three units.
One detail that shapes feasibility on many parcels is sewer. A connection is required when a sewer line runs within 200 feet of the property line, with that distance increasing by 100 feet for each additional dwelling unit. Where no sewer connection applies, the project relies on septic or advanced treatment. We bring Environmental Health into the conversation before plans are drawn, not after a design is already finished.
The south end of Chino sits on the former dairy and farm ground known as The Preserve, roughly 5,435 acres annexed in 2003 and governed by its own specific plan and design guidelines. A project in that area moves through an additional layer of review, and we account for those guidelines during the planning phase rather than discovering them at submittal.
North of downtown, the housing stock tends to be mid-century ranch homes and Craftsmans with closed-off kitchens and lot configurations that reflect an older subdivision pattern. South of downtown, the newer two-story plans that built out from the 1970s onward often sit on lots with different utility layouts and setback relationships. Both conditions affect where a detached unit can be placed and how far sewer, water, and electrical connections have to run, and that directly influences project scope and cost.
Other Remodeling Services We Offer
A modern kitchen adds functionality, comfort, and lasting value to your home. At Horizon Construction & Remodeling, our kitchen remodeling experts bring fresh ideas and professional project management tailored to your unique needs. From layout design to material selection, we prioritize delivering a high-standard kitchen that’s both beautiful and energy-efficient — enhancing the way you cook, gather, and live every day.
Whether you envision a classic Southern California pool or a fully customized backyard oasis, Horizon Construction & Remodeling delivers the highest level of quality and service. Our comprehensive pool design and remodeling services cover everything from layout and decking to built-in BBQs and final touches like landscaping. Let Horizon be your trusted partner in transforming your backyard into the perfect outdoor retreat.
If you are planning a complete bathroom remodel or simply want to change your tub, shower, update your plumbing fixtures, or make the space more efficient, our team at Horizon will help you through the process with expert advice, professional craftsmanship, and affordable options with beautiful results. Learn more about our bathroom remodeling services.
Transform your space with our expert interior work services. We offer a comprehensive range of solutions — from space planning and custom design to the selection of high-quality finishes and materials. Our team of experienced professionals works closely with you to create a space that’s both functional and stylish, tailored to your unique needs, goals, and budget. Whether you’re updating a single room or overhauling your entire interior, we bring precision, creativity, and craftsmanship to every project.
At Horizon, we believe your home is more than just four walls — it’s where life happens. It’s the place you relax, gather with family and friends, and create lasting memories. That’s why we offer a full range of exterior work services designed to elevate your outdoor living space. From patios and hardscaping to custom decks and exterior renovations, we help turn your vision into a dream yard that complements your lifestyle and enhances curb appeal.
At Horizon Construction & Remodeling, our expert team includes a dedicated design and planning division that works hand-in-hand with licensed architects and structural engineers. We take care of everything — from detailed plans and blueprints to securing city permits — so you don’t have to deal with delays or red tape. Our goal is to streamline the process and provide a fully approved set of documents that aligns with both your vision and city regulations, saving you time and stress.
Why Choose Horizon Remodeling As Your ADU Contractor in Chino ?
ADU Construction in Chino: What You Should Know Before You Start
Horizon Construction and Remodeling works as a licensed Class B general building contractor, bonded, with more than 15 years of design-build experience behind us. We handle the plan, the permit submission to the City of Chino Building and Safety Division, and the build itself, all under one contractor. That matters in Chino because the permitting picture depends heavily on where your parcel sits.
Homes north of downtown are often mid-century ranch or Craftsman builds with compartmentalized floor plans, while the newer two-story homes south of downtown sit on what was dairy and farm ground before The Preserve, a roughly 5,435-acre area annexed in 2003, was developed under its own specific plan and design guidelines. An ADU on a lot governed by those guidelines carries different design constraints than one on an older ranch parcel, so feasibility questions come before design questions every time.
California state law provides consistent protections regardless of which part of Chino your property is in: no owner-occupancy requirement applies to an ADU, building one does not trigger a sprinkler retrofit of the main house, and impact fees do not apply to units with 750 square feet or less of interior livable space. We also serve homeowners in nearby College Park and Downtown Chino.
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ADU Contractor Services in Chino
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ADU Contractor in Chino FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary home on your existing lot, built as a detached backyard cottage, a converted garage, or an attached in-law suite. Building one with Horizon Construction and Remodeling can open up rental income, house extended family, or simply add usable square footage, which matters whether your property sits in an established mid-century neighborhood north of Downtown Chino or within the master-planned Preserve to the south.
How much does it cost to build an ADU in California?
What an ADU Actually Costs in Chino
Honest pricing depends on details no contractor can assess from a distance: the size and type of unit you want, whether you are converting an existing structure or building a new detached ADU from the ground up, how far utility runs need to travel across your lot, and the finish level you select. Those variables shift the number considerably. What we can tell you is where the money goes and what state law protects you from. Units at or under 750 square feet of livable space are exempt from impact fees, school fees apply only above 500 square feet, and connection fees for a conversion or junior ADU are capped because the state does not classify those as a new residential use. Building an ADU also cannot legally trigger a fire sprinkler retrofit on your existing home.
Homes in Chino’s newer south-end communities, including those in The Preserve’s specific plan area, may face design guideline requirements that add steps to the City of Chino Building and Safety Division review process, so walking the parcel before quoting a price is not optional for us. Mid-century ranch homes north of downtown carry their own site conditions worth confirming in person. Anyone offering a firm number before seeing your property is guessing. We inspect the lot, verify setbacks and utilities, and then give you a fixed scope and price. One point worth repeating: the CalHFA ADU grant program is closed, its funding fully allocated, and the agency warns that anyone claiming they can help you obtain that grant is running a scam.
Do I need permits for an ADU in Chino?
Yes, every ADU requires a building permit, and in Chino that application goes to the City of Chino Building and Safety Division. State law sets the review clock at 15 business days for a completeness determination and 60 days to approve or deny, and the city’s process reflects those timelines. If the property relies on a well or septic system, Environmental Health becomes part of the review. The sewer proximity rule also applies: connection is required when a public sewer line runs within 200 feet of the property line, which matters on the former dairy and farm ground at the south end of the city where infrastructure can vary lot to lot. Horizon manages the permit submittal, responds to correction notices, and coordinates every required inspection through the finish.
How long does ADU construction take with Horizon Remodeling?
Most ADU construction projects take between 4 to 8 months from design to completion, depending on scope and permit approvals. Horizon Remodeling prioritizes efficient timelines while maintaining quality workmanship.
What types of ADUs can Horizon Remodeling build?
We specialize in building detached ADUs, attached ADUs, garage conversions, backyard cottages, and junior ADUs (JADUs). Our team can help you choose the right ADU style for your property and goals.
Can I build a detached ADU on my property in Chino?
Yes, if your property meets California zoning and space requirements. Horizon Remodeling will assess your site, secure the necessary permits, and build a fully detached ADU tailored to your preferences.
Is Horizon Remodeling licensed to build ADUs in my area?
Yes, Horizon Remodeling is fully licensed, bonded, and insured to build ADUs throughout Orange County and surrounding areas. We have over 18 years of experience delivering high-quality ADU projects.
What are the benefits of hiring Horizon Remodeling for my ADU project?
Horizon Construction & Remodeling Inc. manages ADU projects in Chino from design through the City of Chino Building and Safety Division permit process to final inspection, coordinating every trade so the finished unit meets code and stays within your budget.
Does Horizon Remodeling handle ADU design and permitting?
Absolutely! Horizon Remodeling provides complete ADU design services, including architectural plans and 3D renderings. We also handle city permits and inspections, streamlining your project and reducing stress.
How do I get started on an ADU with Horizon Remodeling?
Schedule a free consultation with Horizon Construction and Remodeling and we will assess your Chino property, talk through your goals, and deliver a detailed estimate covering every phase of your ADU project.
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Horizon is a licensed Class B general building contractor serving Chino and the surrounding Orange County communities.
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