#1 ADU Contractor in Wildomar
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions in Wildomar, managing design, permitting, and material selection from the first conversation through final inspection. Permits for this work go through the City of Wildomar Building and Safety Department, and parcels mapped in Very High Fire Hazard Severity Zones carry additional requirements for ignition-resistant materials and vent protection that we account for early in planning. The large lots common across neighborhoods like The Farm and Sedco Hills often give homeowners real options for a detached backyard unit or a substantial addition.
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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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Working with an adu contractor in Wildomar means navigating a regulatory picture that has shifted considerably in recent years. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and another update took effect January 1, 2026. Under the current rules, square footage is calculated as interior livable space, and a local agency has 15 business days to determine whether a submitted application is complete, then 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review stands between a compliant application and a decision.
For any property within city limits, that application goes to the City of Wildomar Building and Safety Department. Wildomar incorporated on July 1, 2008, after decades of growth under unincorporated Riverside County jurisdiction, so the city’s review process is distinct from what the county handles. That distinction matters because Riverside County’s own ADU ordinance, Ordinance 348 adopted in 2023, contains provisions the California Department of Housing and Community Development formally flagged in May 2025 as noncompliant with state law. Among those provisions are a one-story or 16-foot height cap, a junior ADU size limit set at 50 percent of the primary dwelling, and a parking requirement for interior ADUs. State law preempts all of them, so a homeowner relying on a county handout may believe they can build far less than state law actually permits.
Riverside County also runs 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 the four plans fall under 750 square feet, which puts them below the state’s impact fee threshold. The program excludes parcels in flood hazard or environmental constraint areas, so site mapping is the first question on any project here.
The character of Wildomar’s housing stock shapes what each site can actually support. Much of the city developed as unincorporated county land during the 1970s, 1980s, and 1990s, with growth accelerating after Interstate 15 opened and the population more than doubling since 2000. Ranch houses on generous lots sit alongside 1990s and 2000s tract homes, and lot depth and utility stub locations vary enough that where a detached unit can be placed and how far water, sewer, and electrical lines need to run differs from parcel to parcel.
One additional layer applies to a meaningful portion of the city. Parts of Wildomar are mapped by CAL FIRE as Very High Fire Hazard Severity Zones, and any exterior work on affected parcels must meet ignition resistant material standards and specific vent requirements. That affects siding, eaves, and attic venting choices on a new ADU, and it is something we confirm early in the site review process before any plans are drawn.
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 Wildomar ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle ADU projects in Wildomar from the initial plan through final inspection, with one team managing the drawings, the City of Wildomar Building and Safety Department submittal, and the construction itself.
Wildomar’s housing stock is a mix of ranch-style homes on generous lots built during the county era and tract homes that went up through the 1990s and 2000s. That variety means ADU design decisions are property-specific, and so are permit considerations. Parts of the city fall within CAL FIRE Very High Fire Hazard Severity Zones, which can bring ignition-resistant material requirements and vent standards into exterior work, so we account for those conditions early in the planning process.
California state law provides several protections worth knowing: no owner-occupancy requirement applies to an ADU, adding one does not trigger a sprinkler retrofit on the main house, and units at or under 750 square feet of interior livable space are not subject to impact fees. We work throughout Wildomar, including areas such as The Farm, Sedco Hills, Windsong Valley, and Autumnwood.
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ADU Contractor Services in Wildomar
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ADU Contractor in Wildomar FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a secondary home on your existing property, taking the form of a backyard cottage, a garage conversion, or an in-law suite. Building one with Horizon Construction and Remodeling lets you add rental income, house family members independently, or simply gain usable living space, and the generous lot sizes common across Wildomar neighborhoods like The Farm and Sedco Hills often make that possible without a major footprint compromise.
How much does it cost to build an ADU in California?
What an ADU costs in Wildomar depends on details no contractor can assess from a website alone. The unit size and type matter, as does whether you are converting existing space or building a new detached structure on one of the area’s characteristically large ranch-era lots. Site work, utility runs, and finish level all move the number. What state law does make predictable is where certain costs stop. Any ADU at or under 750 square feet of livable space is exempt from impact fees. School fees only apply above 500 square feet. Connection fees for a junior ADU or a conversion are limited because state law does not classify those as a new residential use, and building an ADU cannot trigger a fire sprinkler retrofit of your existing home.
Before any firm price leaves our mouths, we walk the property. Wildomar parcels in Very High Fire Hazard Severity Zones mapped by CAL FIRE carry ignition-resistant material and vent requirements that affect exterior work, and those requirements get confirmed on site, not assumed. Permits run through the City of Wildomar Building and Safety Department, and we factor that process into every scope. One thing worth stating plainly: the CalHFA ADU grant program is closed and fully allocated. The agency itself warns that anyone offering to help secure that grant is running a scam.
Do I need permits for an ADU in Wildomar?
Yes, an ADU always requires a building permit, though approval is ministerial rather than discretionary, meaning there is no hearing and no design review board to satisfy. Applications for Wildomar properties go to the City of Wildomar Building and Safety Department, which operates under state timelines giving the 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. We prepare and submit the permit package and stay with the project 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 Wildomar?
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 through the City of Wildomar Building and Safety Department, and construction as a single coordinated process, keeping your project on budget and code compliant, including ignition resistant material requirements that apply to parcels in the city’s Very High Fire Hazard Severity Zones.
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. at (714) 449-9035 to schedule a free consultation, where we assess your Wildomar property, discuss your goals, and deliver a detailed estimate covering every phase of your ADU project.
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Horizon is a licensed Class B general building contractor serving Wildomar and the surrounding Orange County communities.
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