#1 ADU Contractor in San Clemente
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout San Clemente, managing design, permitting, material selection, and construction under one contract. Permits go through the City of San Clemente Community Development Department, and properties near the shore may also require a coastal development permit under the city’s Local Coastal Program, something we account for early in the process. From older Spanish Colonial Revival cottages near the Pier Bowl to larger newer homes in Forster Ranch or Talega, every project is scoped to fit the specific property.
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 San Clemente means working with someone who understands both state law and the local variables that shape every project here. California ADU law, codified in Government Code sections 66310 through 66342, was updated effective January 1, 2026. Square footage is now measured as interior livable space, and the reviewing agency has 15 business days to determine whether your application is complete, then 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 San Clemente Community Development Department. If your property sits within the California coastal zone, which covers a substantial portion of the city, Planning Services administers a Local Coastal Program that can require a coastal development permit whenever work changes the building envelope. That adds a layer worth knowing about before you finalize a design.
The lot itself drives most other decisions. San Clemente’s housing stock splits sharply between older Spanish Colonial Revival cottages near the Pier Bowl, many built in the 1920s and 1930s, and the far newer and larger homes in inland specific plan areas like Forster Ranch and Talega. Those two contexts produce very different site conditions, utility run distances, and grade challenges, which is why we walk every parcel before drawing anything.
State law sets a firm floor for what a local agency can require. Side and rear setbacks cannot exceed four feet, a unit cannot be capped below 850 square feet of interior livable space, owner-occupancy cannot be required, and there are no impact fees on units of 750 square feet or less. Building an ADU also cannot trigger a fire sprinkler retrofit of the main house.
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 San Clemente ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and based in Fullerton, with over 15 years of ADU and general building work across Southern California. San Clemente is a straightforward drive from our office, so this is not a distant or unfamiliar market for us. A detached ADU is essentially a small house built on a lot that already has a primary residence, covering foundation, framing, envelope, plumbing, electrical, a kitchen, and a bathroom, all coordinated under one general contractor.
San Clemente’s permit process runs through the City of San Clemente Community Development Department, and properties near the shore may also require a coastal development permit under the city’s Local Coastal Program. We account for that possibility early in design, not after plans are drawn, because a coastal review can affect the building envelope and needs to move alongside the standard building permit, not behind it.
The housing stock here ranges widely, from compact 1920s and 1930s cottages near the Pier Bowl to larger, newer homes in specific plan areas like Forster Ranch and Talega. Those are genuinely different projects, and our approach to each reflects that difference from the first conversation through the final walkthrough.
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ADU Contractor Services in San Clemente
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ADU Contractor in San Clemente FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary home on your existing lot, taking the form of a converted garage, a detached backyard structure, or an attached in-law suite. Building one in San Clemente gives you a way to generate rental income, house extended family, or simply add usable square footage to your property.
How much does it cost to build an ADU in California?
What an ADU Project in San Clemente Actually Costs
No honest contractor can quote you a firm number from a web page alone. The real cost depends on whether you are converting an existing structure or building a detached unit from scratch, how much site work and utility routing your lot requires, and the finish level you choose. What the law does protect you from is worth knowing before you budget. An ADU with 750 square feet or less of interior livable space is exempt from impact fees. School fees only apply above 500 square feet. Connection fees for a conversion or junior ADU are limited because the state does not classify those as a new residential use. Building an ADU also cannot force a fire-sprinkler retrofit on your existing home.
San Clemente’s permit process runs through the City of San Clemente Community Development Department, and if your property sits within the California coastal zone, a coastal development permit through the city’s Local Coastal Program may also be required before any work that changes the building envelope can begin. That extra layer affects how we sequence the approval process and what documentation we prepare. We walk every parcel, confirm setbacks, utility connections, and any coastal review triggers, and then give you a fixed scope and price you can hold us to. One point worth repeating: 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 San Clemente?
Yes, an ADU always requires a building permit, though approval is ministerial rather than discretionary, meaning no hearing or design review board gets involved. In San Clemente, applications go to the City of San Clemente Community Development Department, and if your property sits within the California coastal zone, a coastal development permit through the city’s Local Coastal Program may also be required. State law sets a 15-business-day completeness review and a 60-day approval window, shortened to 30 days with a pre-approved plan. We prepare and submit the full package and carry it through every inspection.
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 San Clemente?
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 ADU work in San Clemente, from design and permitting through construction, coordinating with the City of San Clemente Community Development Department and, where the project sits within the coastal zone, navigating the Local Coastal Program process as well.
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 get started? Contact Horizon Construction & Remodeling Inc. for a free consultation, where we assess your property, talk through your goals, and deliver a detailed estimate covering every phase of your San Clemente 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 San Clemente and the surrounding Orange County communities.
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