#1 ADU Contractor in Barstow
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions for homeowners in Barstow, managing design, budgeting, permit coordination with the City of Barstow Building and Safety Division, and material selection from start to final walkthrough. The work covers detached backyard units, attached additions, and converted spaces, and every project is handled with the structural and energy considerations that Mojave Desert conditions demand, where summer temperatures regularly climb past 100 degrees and winter nights can drop near freezing. Reach out 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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Finding the right adu contractor in Barstow means understanding how state law, local permitting, and the desert environment all shape what actually gets built on your property. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and those rules were updated again on January 1, 2026. Square footage is now measured as interior livable space, and once you submit an application, the reviewing agency has 15 business days to confirm it is complete and 60 days to issue an approval or denial. Approval is ministerial, meaning no public hearing and no discretionary design review stands between a complete application and a decision.
In Barstow, that application goes to the City of Barstow Building and Safety Division. San Bernardino County adopted Development Code Chapter 84.36 on January 13, 2026, making it the most current county ADU ordinance among the areas we serve. The county standards set ADU size between 200 and 1,200 square feet, allow a junior ADU up to 500 square feet, and permit attached height up to 25 feet and detached height up to 18 feet, with two additional feet allowed to match a particular roof pitch. Side and rear setbacks are four feet, with five feet of separation required between detached structures.
Two provisions stand apart from what the coastal counties allow. Properties can have two ADUs per lot, and parcels of five acres or more can carry three units total. Those allowances open real options for larger lots in areas like North Barstow and Montara where land runs wider than the footprint of the house.
Sewer feasibility often decides whether a project moves forward at all. 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 sewer is not reachable, septic or advanced treatment applies. We bring Environmental Health into the conversation before a plan is drawn, not after a design has already been priced out.
Barstow was incorporated in 1947 and built out largely through the railroad and Route 66 eras, leaving a housing stock with a median build year around 1963. Most homes are compact single-story ranches averaging roughly 1,400 square feet, stucco-clad, with a small walled-off kitchen separated from the living room. That layout affects where a detached unit can realistically sit and how far utilities need to run. On top of that, Barstow sits at 2,175 feet in the Mojave, where summer temperatures regularly climb past 100 degrees and winter lows drop near 30. Any structure built here has to be detailed for that thermal range, which influences insulation, glazing, and mechanical choices from the first draft of the plans.
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 Barstow ?
ADU Construction in Barstow Built for the Mojave Climate and Local Process
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle ADU projects as a single point of contact: one company draws the plans, submits to the City of Barstow Building and Safety Division, and completes the build. That matters in a city where most of the housing stock dates to the railroad and Route 66 era, with a median build year around 1963 and compact single-story ranch homes that average roughly 1,400 square feet. Fitting a new unit onto that kind of lot takes planning before it takes permits.
Barstow sits at 2,175 feet in the Mojave Desert. Summer highs regularly clear 100 degrees, winter lows drop near 30, and annual rainfall stays under 5 inches. That temperature swing affects material choices, mechanical systems, and how utility connections to the ADU are detailed. We work through those site questions early, before the design is finalized, so the plans we submit to Building and Safety reflect actual conditions on your parcel.
California state law provides several protections that apply regardless of where the property sits: no owner-occupancy requirement for an ADU, no sprinkler retrofit triggered on the main house, and no impact fees on a unit with 750 square feet or less of interior livable space. We work in established Barstow areas including North Barstow, Montara, and Nebo Center. Contact us to request a free estimate for your ADU project.
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ADU Contractor Services in Barstow
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ADU Contractor in Barstow FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary home built on your existing property, taking the form of a converted garage, a backyard cottage, or a dedicated in-law suite. Adding one gives Barstow homeowners a way to generate rental income, house extended family, or simply gain usable square footage beyond what those compact mid-century ranches were built to offer.
How much does it cost to build an ADU in California?
What an ADU costs in Barstow depends on details no contractor can assess from a distance: the size and type of unit you want, whether you are converting existing space or building a new detached structure, how much site work your lot requires, and the finish level you select. Those variables matter even more on the compact single-story ranches that make up most of the housing stock here, where utility runs and setback conditions can shift the budget considerably. Because permits in Barstow go through the City of Barstow Building and Safety Division, confirming what your specific parcel will require is a necessary first step before any honest number can be put on paper. We walk the property, verify the utility and setback situation, and then give you a fixed scope and price you can hold us to.
State law does set some firm protections worth knowing. A unit of 750 square feet of livable space or less is exempt from impact fees, school fees apply only above 500 square feet, and connection fees for a conversion or junior ADU are limited because the state does not classify those as a new residential use. Adding an ADU also cannot force a fire sprinkler retrofit on your main house. One caution worth stating plainly: the CalHFA ADU grant program is closed, its funding fully allocated, and the agency itself warns that anyone offering to help you obtain that grant is running a scam.
Do I need permits for an ADU in Barstow?
Yes, every ADU requires a building permit, and in Barstow that application goes to the City of Barstow Building and Safety Division. State law sets the review timeline at 15 business days for a completeness determination and 60 days to approve or deny, and local review follows those same benchmarks. If the property relies on a septic system or a well, Environmental Health typically joins the review. Sewer proximity is also checked, since connection is generally required when a sewer line runs within 200 feet of the property line. Horizon manages the submittal, any plan check corrections, 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 Barstow?
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 design, permitting through the City of Barstow Building and Safety Division, and construction as a single managed process, keeping your project code-compliant and on budget across every phase.
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 & Remodeling Inc. by calling (714) 449-9035. We visit your property, talk through your goals, and deliver a detailed estimate, then guide you through every phase of your Barstow ADU project from design to final inspection.
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Horizon is a licensed Class B general building contractor serving Barstow and the surrounding Orange County communities.
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