#1 ADU Contractor in Huntington Beach
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout Huntington Beach, handling design coordination, budgeting, permit applications, and material selection under one general contract. The city’s tract housing stock, built out rapidly from the late 1950s through the 1970s, often has room on the lot for a detached backyard unit or a garage conversion, and we work through the City of Huntington Beach Community Development Department Building Division to keep every project code-compliant. Properties inside the coastal zone may also require a coastal development permit, which we factor in from the start.
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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 Huntington Beach means understanding both state law and the local permit process before a single drawing is made. California Government Code sections 66310 through 66342 govern ADUs statewide, and the rules shifted 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 approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review.
Your application goes to the City of Huntington Beach Community Development Department Building Division. If your property sits inside the coastal zone, it may also require a coastal development permit under the city’s certified Local Coastal Program, specifically Zoning Ordinance Chapter 245. That coastal layer adds a step that not every homeowner anticipates, so confirming your parcel’s status early keeps the schedule from stalling later.
Huntington Beach grew fast from the late 1950s through the 1970s, and most of that housing is single-story or two-story stucco tract construction on slab foundations. The typical floor plan puts the kitchen near a breakfast nook and separates it from the formal living room, which directly affects where a detached unit can land, how far utilities need to run, and whether a garage conversion or a new detached build is the more practical path. We walk the parcel first, checking setbacks, grade, and utility routes before anything goes on paper.
State law sets firm protections regardless of where the lot sits. A local agency cannot cap an ADU below 850 square feet of interior livable space, or 1,000 square feet for a unit with more than one bedroom. Side and rear setbacks cannot exceed four feet. Owner-occupancy cannot be required, building an ADU cannot trigger a sprinkler retrofit of the main house, and there are no impact fees on a unit of 750 square feet or less.
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 Huntington Beach ?
ADU Contractor in Huntington Beach
Horizon Construction and Remodeling is a licensed and bonded Class B general building contractor, and we have been doing design-build work since 2009. Our Fullerton office puts Huntington Beach well within our regular service area. A detached ADU is a complete small residence built on a lot that already has a primary home. That means foundation, framing, a full envelope, a kitchen, a bathroom, and the rough-in work for both plumbing and electrical, all coordinated under one contract.
Huntington Beach grew rapidly through the 1960s and 1970s, and most of its single-story and two-story stucco tract homes sit on slab foundations. That existing slab geometry shapes where a detached ADU can realistically land on the lot. Permits go through the City of Huntington Beach Community Development Department Building Division, and properties inside the coastal zone may also require a coastal development permit under the city’s Local Coastal Program.
Because we handle design and construction together, permit submittals reflect actual build conditions from the start. We work throughout Huntington Beach, including Downtown, Huntington Harbour, Seacliff, and Sunset Beach.
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ADU Contractor Services in Huntington Beach
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ADU Contractor in Huntington Beach 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 garage conversion, backyard cottage, or in-law suite. Adding one with Horizon Construction & Remodeling gives you rental income potential, flexible family housing, or extra living space, which matters on the slab-foundation tract lots that make up much of Huntington Beach.
How much does it cost to build an ADU in California?
What an ADU Actually Costs in Huntington Beach
Pricing an ADU honestly means accounting for factors no website can pin down in advance: the unit size, whether you are converting existing space or building a new detached structure, the utility runs your specific lot requires, and the finish level you have in mind. What we can tell you is how state law shapes the cost picture. Any ADU at or under 750 square feet of livable space is exempt from local impact fees. School fees only apply once a unit exceeds 500 square feet. Connection fees for a garage conversion or a junior ADU are capped under state law, because those unit types are not treated as a new residential use. Building an ADU also cannot legally trigger a fire sprinkler retrofit of your existing home.
Huntington Beach routes all ADU permits through the City of Huntington Beach Community Development Department Building Division, and properties inside the coastal zone may also need a coastal development permit under the city’s Local Coastal Program. Both layers affect how long the approval process takes, which is one more reason a firm quote before a site visit is just a guess. We walk your property, confirm setbacks and utility conditions, and give you a fixed scope and price from there. One caution worth stating plainly: the CalHFA ADU grant program is closed and fully allocated. Anyone offering to help you secure that grant is running a scam.
Do I need permits for an ADU in Huntington Beach?
Yes, an ADU always requires a building permit, but the approval is ministerial rather than discretionary, meaning there is no hearing and no design review board to satisfy. Applications in Huntington Beach go to the City of Huntington Beach Community Development Department Building Division, and state law gives that agency 15 business days to confirm completeness and 60 days to approve or deny. A pre-approved plan shortens that review window to 30 days. Horizon prepares and submits the full package and stays with the project through every inspection, so the permitting process never lands back in the homeowner’s lap.
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 Huntington Beach?
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, and construction from start to finish, coordinating every phase so your project meets building codes and stays within budget. For homes inside Huntington Beach’s coastal zone, that process can include a coastal development permit through the city’s Local Coastal Program.
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?
Ready to move forward? Reach out to us for a free consultation, where we assess your property, talk through your goals, and deliver a detailed estimate with design recommendations, then guide you through every phase of your ADU project in Huntington Beach.
Recent ADU and Garage Conversions
Three completed ADU and garage conversion projects from our Orange County portfolio. Every project below was built in San Clemente. Nothing loads from YouTube until you press play.
ADU project in San Clemente
ADU project in San Clemente
ADU project in San Clemente
Built by Horizon Construction & Remodeling, Inc. Licensed Class B general building contractor.
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Horizon is a licensed Class B general building contractor serving Huntington Beach and the surrounding Orange County communities.
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