#1 ADU Contractor in Garden Grove
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout Garden Grove, coordinating every phase from design and budgeting through permits with the City of Garden Grove Building and Safety Division and final construction. Many of the ranch-style homes on slab foundations built during the city’s postwar tract boom have unused yard space well suited to a detached backyard unit or attached addition. We manage material selection, subcontractor coordination, and code compliance so you have one point of contact from the first conversation to the final walkthrough.
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 Garden Grove means working with someone who understands both state law and the local conditions that shape what you can actually build. California ADU law, codified in Government Code sections 66310 through 66342 and updated January 1, 2026, measures square footage as interior livable space. Once you submit, the City of Garden Grove Building and Safety Division has 15 business days to determine whether your 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 you and a decision. No unusual local overlay applies in Garden Grove, so the building code and any applicable association rules are what govern. That straightforward regulatory environment is worth knowing before you start planning.
The physical realities of Garden Grove lots matter just as much as the paperwork. The city built out fast with postwar tracts through the 1950s and 1960s, and most parcels carry a modest single-story ranch on a slab foundation. That foundation type and the compact floor plan influence where a detached unit can sit and how far utilities have to run. We walk every parcel first, checking setbacks, grade, and utility routes before drawing anything.
State law sets firm floors regardless of parcel size: agencies cannot cap an ADU below 850 square feet, or 1,000 square feet for two or more bedrooms; side and rear setbacks cannot exceed four feet; owner-occupancy cannot be required; building an ADU cannot trigger a sprinkler retrofit on the main house; and there are no impact fees on units 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 Garden Grove ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. Garden Grove sits just a short drive from our Fullerton office, so projects here are straightforward for our team to manage without the friction of a long-distance job.
A detached ADU is essentially a small independent dwelling placed on a lot that already has a primary home. It needs its own foundation, framing, roof, electrical service, plumbing, kitchen, and bathroom. Because Garden Grove’s postwar ranch homes were built out quickly through the 1950s and 1960s, many lots have the footprint to accommodate a detached unit, though each site has to be evaluated on its own conditions. Permits are submitted to the City of Garden Grove Building and Safety Division, and we handle that process as part of the project.
We work throughout Garden Grove, including West Garden Grove, Little Saigon, the historic Main Street downtown, and Buena Clinton, as well as nearby Midway City, Westminster, and Stanton.
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ADU Contractor Services in Garden Grove
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ADU Contractor in Garden Grove FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary residence on your existing property, taking the form of a converted garage, a backyard cottage, or an in-law suite. Building one with Horizon Construction and Remodeling can open a rental income stream, give a family member a private place to live, or simply add usable square footage to your Garden Grove home.
How much does it cost to build an ADU in California?
ADU costs in Garden Grove vary based on factors we cannot assess from a web page alone. The size of the unit, whether you are converting existing space or building a detached structure from scratch, the utility runs your lot requires, and the finish level you select all drive the final number in different directions. What we can explain is where the money actually goes and what state law shields you from. A unit with 750 square feet or less of interior livable space is exempt from impact fees. School fees only apply once the unit exceeds 500 square feet. Connection fees for a conversion or junior ADU are capped, because the state does not classify those as a new residential use. Adding an ADU also cannot force a fire sprinkler retrofit on your existing home.
Garden Grove permits flow through the City of Garden Grove Building and Safety Division, and since no unusual local overlay applies here, the building code is what governs the review. Anyone quoting a firm price before walking your specific parcel is working from guesswork. We visit the property, confirm setbacks and utility conditions, and then provide a fixed scope and price you can hold us to. One point 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 running a scam.
Do I need permits for an ADU in Garden Grove?
Yes, an ADU always requires a building permit, though approval is ministerial rather than discretionary, meaning there is no public hearing and no design review board to clear. In Garden Grove, that application goes to the City of Garden Grove Building and Safety Division. Under state law, the agency has 15 business days to confirm the application is complete and 60 days to approve or deny it, a window that shortens to 30 days when a pre-approved plan is used. We prepare and submit the full package and follow it through every inspection so the process does not fall 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 Garden Grove?
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 Garden Grove from initial design through final inspection, coordinating every stage so the finished unit meets building code and fits your budget. Permits are submitted to the City of Garden Grove Building and Safety Division, and we manage that process for you.
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 consultation, where we review your Garden Grove property, talk through your goals, and put together a detailed estimate with design recommendations so you know exactly what to expect at every phase of your ADU project.
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 Garden Grove and the surrounding Orange County communities.
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