#1 ADU Contractor in San Jacinto
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout San Jacinto, managing design, budgeting, permitting through the City of San Jacinto Building and Safety Division, and material selection from start to final walkthrough. Projects here range from detached backyard cottages to attached units added onto existing homes. Because the San Jacinto Fault Zone runs through the valley, foundation work, shear wall detailing, and structural bracing get careful attention on every build. We coordinate every trade so your project meets code and fits your goals.
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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Hiring an adu contractor in San Jacinto means working inside a legal framework that has shifted considerably in recent years. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and another round of changes took effect January 1, 2026. Square footage is now measured as interior livable space only. Once you submit an application, the City of San Jacinto Building and Safety Division has 15 business days to determine whether it is complete and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review.
San Jacinto sits in a valley shaped by two distinct eras of growth. A small historic core was laid out in 1883 and the city incorporated in 1888, but the population climbed from roughly 17,600 in 1990 to about 44,200 in 2010 as subdivision tracts spread across the valley floor. That growth pattern matters because the lot size, utility placement, and setback conditions on a 1990s tract home differ considerably from those on an older valley cottage or ranch property near Downtown or Park Hill.
The San Jacinto Fault Zone runs directly through this valley and ranks among the most seismically active fault zones in Southern California. On any project that touches the structure, foundation design, shear wall placement, and lateral bracing all carry more weight here than they would in less active areas. Those details are not optional additions to a budget estimate. They are the starting point.
Riverside County operates a Permit Ready ADU program offering four pre-approved plans ranging from a 499 square foot studio to a 909 square foot two-bedroom. Three of those plans fall under 750 square feet, which keeps them below the state impact fee threshold. The program excludes parcels in flood hazard or environmental constraint areas, so confirming which maps cover your specific lot is the first practical question on any San Jacinto site.
It is also worth knowing that Riverside County’s own ADU ordinance, Ordinance 348 adopted in 2023, contains provisions that California’s Department of Housing and Community Development formally flagged in May 2025 as non-compliant with state law. Among them are a one-story or 16-foot height cap, a junior ADU cap set at 50 percent of the primary dwelling, and a parking requirement for interior ADUs. State law preempts all of these. A homeowner reading only the county handout could easily conclude the law allows less than it actually does, which is exactly the kind of detail worth sorting out before a single permit is filed.
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 Jacinto ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle the full ADU process under one roof, from drawing the plans to pulling permits through the City of San Jacinto Building and Safety Division and completing construction. Keeping everything under one contractor reduces the back-and-forth that slows projects down.
San Jacinto sits within one of the most seismically active fault zones in Southern California, so foundation design, shear wall placement, and structural bracing are not details we treat lightly on any ADU project here. The City of San Jacinto Building and Safety Division will scrutinize those elements, and we plan for that from the start rather than revising after the fact.
On the regulatory side, California law removes the owner-occupancy requirement for ADUs, does not trigger a sprinkler retrofit on your existing home, and waives impact fees on units with 750 square feet or less of interior livable space. We design to those protections and account for site-specific constraints your parcel may carry. Neighborhoods we work in include Downtown San Jacinto around Main Street and Five Points, Soboba Springs, and Park Hill.
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ADU Contractor Services in San Jacinto
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ADU Contractor in San Jacinto FAQ
What is an ADU and why should I build one?
An ADU is a secondary housing unit on your own property, such as a backyard cottage, garage conversion, or in-law suite. Building one with Horizon Construction & Remodeling gives San Jacinto homeowners a way to generate rental income, add space for family members, or simply make better use of a lot.
How much does it cost to build an ADU in California?
ADU costs depend on factors a website cannot assess: unit size, conversion versus new detached construction, the site work and utility runs your lot requires, and the finish level you choose. State law limits certain fees in your favor. Any ADU at or under 750 square feet of interior livable space is exempt from impact fees, school fees apply only above 500 square feet, and connection fees for a conversion or junior ADU are capped because the state does not treat those as a new residential use. Adding an ADU also cannot trigger a fire sprinkler retrofit on your main home.
No contractor can give a reliable price before walking your parcel. In San Jacinto, the fault zone through the valley is one of the most seismically active in Southern California, so foundation, bracing, and shear wall details matter on structural projects here. Permits go through the City of San Jacinto Building and Safety Division. We visit the property, verify setbacks and utilities, and give you a fixed scope and price you can hold us to. The CalHFA ADU grant program is closed, funding fully allocated, and the agency warns that anyone offering to help you obtain an ADU grant is running a scam.
Do I need permits for an ADU in San Jacinto?
Yes, an ADU always requires a building permit, but the approval process is ministerial rather than discretionary, meaning there is no hearing and no design review board to satisfy. Applications for San Jacinto properties go to the City of San Jacinto Building and Safety Division, and state law gives the agency 15 business days to confirm completeness and 60 days to issue a decision, a window that drops to 30 days when a pre-approved plan is submitted. We prepare the full package, submit it, and see it through every inspection so the homeowner never has to manage that process alone.
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 Jacinto?
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 phase of ADU work in San Jacinto, from design and City of San Jacinto Building and Safety Division permitting through construction and final inspection, coordinating all trades so the finished unit 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?
Ready to move forward on an ADU in San Jacinto? Contact Horizon Construction & Remodeling Inc. to schedule a free consultation, where we assess your property, talk through your goals, and deliver a detailed estimate covering every phase of the project.
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Horizon is a licensed Class B general building contractor serving San Jacinto and the surrounding Orange County communities.
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