#1 ADU Contractor in Colton
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions for homeowners in Colton, handling design coordination, permitting through the City of Colton Building and Safety Division, and construction under one contract. Many homes here are postwar bungalows or 1980s and 1990s tract houses, and the age of the structure typically shapes what the building code requires for a new ADU. We manage every trade involved so the project moves forward without the homeowner chasing multiple contractors. Call us 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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Hiring an adu contractor in Colton means working inside a regulatory framework that has shifted recently and continues to move. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and further changes took effect January 1, 2026. Under the current law, square footage is measured as interior livable space, an agency has 15 business days to determine whether a submitted application is complete, and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review stands between a complete application and a decision.
In Colton, that application goes to the City of Colton Building and Safety Division. No unusual local overlay applies here, so what governs a project is the California building code combined with the age and condition of the existing structure. For a city whose housing stock carries a median build year of roughly 1983, that second point matters. Postwar bungalows and 1990s tract houses were built to standards that differ meaningfully from current code, and we account for that before a plan is drawn.
San Bernardino County adopted Development Code Chapter 84.36 at the Board of Supervisors on January 13, 2026. The county standards allow an ADU from 200 up to 1,200 square feet, a junior ADU to 500 square feet, attached height to 25 feet and detached to 18 feet with up to two additional feet to match an existing roof pitch, and four-foot side and rear setbacks with five feet of separation between detached structures. Two ADUs per lot are permitted, and properties of five acres or more may have three units.
Sewer connection is often the question that decides feasibility before anything else. 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 that threshold is not met, the project goes to septic or advanced treatment, and we involve Environmental Health early rather than after plans are already drafted.
The lot and the house together decide most of what remains. Colton’s typical single-story stucco bungalow or 1980s tract home tends to have a compact, closed kitchen layout and a separate dining area, which shapes how interior square footage is arranged and where a detached unit can realistically sit. Utility runs, setbacks, and the condition of older infrastructure all factor into where a unit lands on the property. We work through those site conditions during the initial consultation so the project design reflects what the lot will actually support.
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 Colton ?
ADU Construction in Colton
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and operating since 2009. We handle ADU projects from initial plan through final inspection under one roof, which means a single point of contact draws the plans, submits them to the City of Colton Building and Safety Division, and manages the build. That matters here because Colton’s housing stock runs heavily toward postwar bungalows and 1980s to 1990s tract houses, and the age of the structure is one of the primary factors that shapes what the building code requires of an ADU project.
Before design work begins, we work through the feasibility questions first: sewer connection, utility routing, site access, and how the existing home’s construction era affects structural and code considerations. Because no unusual local overlay applies in Colton, it is the base building code and the age of the house that govern the scope of work.
California state law provides several protections that apply to your parcel regardless of location. There is no owner-occupancy requirement attached to building an ADU, no sprinkler retrofit of the main house triggered by adding one, and no impact fees on a unit with 750 square feet or less of interior livable space. Neighborhoods we work in across Colton include Reche Canyon, Cooley Ranch, and Indian Knolls.
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ADU Contractor Services in Colton
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ADU Contractor in Colton FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a secondary home on your own lot, built as a backyard cottage, a converted garage, or an in-law suite. Adding one in Colton lets you generate rental income, house family members independently, or simply gain more livable space on a lot that, in neighborhoods like Cooley Ranch or Reche Canyon, often has room to work with.
How much does it cost to build an ADU in California?
Pricing an ADU in Colton honestly requires a site visit, not a figure pulled from a webpage. The cost depends on whether you are adding a detached unit or converting existing space, how much site work and utility routing your specific lot demands, and the finish level you select. What we can tell you is how state law structures the fees. A unit at or under 750 square feet of livable space is exempt from impact fees. School fees apply only when the unit exceeds 500 square feet. Connection fees are limited for conversions and junior ADUs because state law does not classify those as a new residential use. Building an ADU also cannot force a fire sprinkler retrofit on your existing home.
Because a large share of Colton’s housing stock dates to the postwar decades and the 1980s to 1990s tract-home era, code compliance and utility condition vary from parcel to parcel, and the City of Colton Building and Safety Division governs what is required for your specific structure. Any contractor quoting a firm number before walking the property is estimating blind. We confirm setbacks, utility connections, and structural conditions first, then give you a fixed scope and price. One caution worth stating plainly: the CalHFA ADU grant program is closed and fully allocated, and the agency itself warns that anyone offering to help you obtain that grant is operating a scam.
Do I need permits for an ADU in Colton?
Yes, every ADU requires a building permit, and in Colton that application goes to the City of Colton Building and Safety Division. State law sets the review clock at 15 business days for a completeness determination and 60 days to issue an approval or denial, and the city’s process already reflects those timelines. Given that much of Colton’s housing stock dates to the postwar era through the 1990s, the age and condition of the existing structure often shape what the plan set needs to address. Where septic systems or wells are present, Environmental Health joins the review, and sewer proximity is also checked, since connection is required when a sewer line falls within 200 feet of the property line. Horizon manages the submittal, any correction responses, and all required inspections.
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 Colton?
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. handles ADU work in Colton from design through final inspection, coordinating permits with the City of Colton Building and Safety Division and managing every trade so your project stays on budget and on schedule.
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?
Reach out to Horizon Construction & Remodeling Inc. to set up a free estimate. We review your Colton property, talk through your goals, offer design input based on what your home and lot can support, and give you a detailed, no-obligation quote before any work begins.
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Horizon is a licensed Class B general building contractor serving Colton and the surrounding Orange County communities.
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