#1 ADU Contractor in Anaheim
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and room additions throughout Anaheim, managing design coordination, permitting through the City of Anaheim Building Division, and construction across every phase of the project. Much of the city’s housing stock consists of postwar single-story tract homes on slabs, and our work as an ADU contractor in Anaheim regularly involves navigating the structural and site constraints those properties present, as well as the additional review requirements that apply in the city’s designated historic districts. Specialty trade portions are handled by appropriately licensed subcontractors we coordinate directly.
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 Anaheim means working with someone who understands both state law and the local permit process before a single drawing is started. California Government Code sections 66310 through 66342 govern ADUs statewide, and changes that took effect January 1, 2026 redefined square footage as interior livable space, tightened agency review to 15 business days for completeness and 60 days for a final decision, and made approval ministerial, meaning no public hearing and no discretionary design review. Applications in Anaheim go through the City of Anaheim Building Division.
Four historic districts, including the Anaheim Colony, Five Points and Historic Palm, are recognized under a citywide preservation program supported by Mills Act contracts. If your parcel sits inside one of those boundaries, the designation shapes what materials and massing the city will accept, and we account for that early in the process rather than after drawings are already done.
Anaheim’s housing stock reflects three distinct development periods, and that history affects almost every ADU decision. Postwar tract homes on slabs in areas like West Anaheim typically dictate a detached build or a garage conversion, while the larger two-story plans that spread through Anaheim Hills from 1971 onward often open different options. We walk each parcel to check setbacks, grade, utility routes and equipment access before anything is drawn.
State law sets a floor of protections regardless of where your 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, adding an ADU cannot trigger a sprinkler retrofit on 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 Anaheim ?
Horizon Construction and Remodeling builds ADUs throughout Anaheim as a licensed and bonded Class B general building contractor, with more than fifteen years of design-build work behind us. Our office sits in Fullerton on South Euclid Street, so Anaheim is a routine drive for our crew, not a remote project.
A detached ADU is a complete small dwelling placed on a lot that already carries a primary home. That means foundation, framing, roof, electrical service, plumbing, a kitchen and a full bathroom all have to come together under one permit. Because design decisions and construction constraints are inseparable on an ADU, having one company draw the plans, submit to the City of Anaheim Building Division and then build the structure keeps the process cleaner. Anaheim also maintains historic districts that include the Anaheim Colony and Five Points, so properties in those areas may carry additional review requirements we account for during the design phase.
We also build ADUs in Fullerton, Placentia and Garden Grove. Neighborhoods we work in regularly across Anaheim include Anaheim Hills, West Anaheim, Five Points and the Anaheim Colony.
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ADU Contractor Services in Anaheim
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ADU Contractor in Anaheim FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary residence on your existing lot, built as a backyard cottage, a garage conversion, or an attached in-law suite. Adding one with Horizon Construction and Remodeling can open a rental income stream, house extended family, or simply give your property more usable living space, including on Anaheim’s older postwar lots where a detached structure often fits naturally behind the primary home.
How much does it cost to build an ADU in California?
What an ADU actually costs in Anaheim depends on details no contractor can assess from a description alone: the size of the unit, whether you are converting an existing structure or building a detached addition, how much site and utility work your lot requires, and the finish level you select. Those variables move the number more than anything else. What we can tell you before the first site visit is where state law draws some firm lines. An ADU of 750 square feet or less of interior livable space is exempt from impact fees, and school fees only apply above 500 square feet. Connection fees for a junior ADU or a garage conversion are limited because state law does not treat those as a new residential use, and building an ADU cannot force a fire sprinkler retrofit on your existing home.
For owners in the Anaheim Colony or Five Points historic districts, the permit process through the City of Anaheim Building Division adds a layer of review that affects scope and scheduling, so early planning matters. Anyone offering a firm bid without walking the parcel is estimating blind. We confirm setbacks, utility connections, and lot conditions first, then give you a fixed scope and price. One thing worth stating plainly: the CalHFA ADU grant program is closed and fully allocated, and the agency itself warns that anyone promising to help you obtain that grant is running a scam.
Do I need permits for an ADU in Anaheim?
Yes, an ADU always requires a building permit, though the approval process is ministerial rather than discretionary, meaning no hearing or design review board gets involved. In Anaheim, the application goes directly to the City of Anaheim Building Division, which has 15 business days under state law to confirm completeness and up to 60 days to approve or deny the project. A pre-approved plan can shorten that review window to 30 days. We prepare and submit the full permit package and see it through every inspection, so none of that falls back on you.
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 Anaheim?
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 every stage of your ADU project in Anaheim, from design and City of Anaheim Building Division permitting through final construction, coordinating each trade so the work meets code and fits 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?
Reach out to Horizon Construction & Remodeling Inc. to schedule a free estimate, and we will walk your property, talk through what you want to accomplish, and give you a clear written proposal covering every phase of your Anaheim ADU project from design through final inspection.
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 Anaheim and the surrounding Orange County communities.
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