#1 ADU Contractor in Laguna Hills
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and room additions for homeowners across Laguna Hills, giving you added living space or rental income without leaving the neighborhood you already know. Many of the tract homes built across subdivisions like Nellie Gail Ranch and Aliso Meadows in the 1960s through 1980s sit on lots that work well for a detached backyard unit or a garage conversion, and we coordinate design, permitting through the City of Laguna Hills Community Development Department, and construction across every trade involved. If your property falls within an HOA with an architectural review committee, we factor that approval process in from the start.
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.
Read More →
Hiring an adu contractor in Laguna Hills means working within a specific set of state rules that have continued to evolve. As of January 1, 2026, California Government Code sections 66310 through 66342 define square footage as interior livable space, and a local agency 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 apply to your project.
Your application goes to the City of Laguna Hills Community Development Department Building and Safety Division. State law sets a floor on what that agency can require: no local ordinance can cap an ADU below 850 square feet of interior livable space, or 1,000 if the unit has more than one bedroom. Side and rear setbacks cannot exceed four feet, owner-occupancy cannot be required, and there are no impact fees on a unit of 750 square feet or less. Building an ADU also cannot trigger a fire sprinkler retrofit of the main house.
The housing stock adds its own layer of complexity. Most of Laguna Hills was built out across the 1970s and 1980s from subdivisions carved out of the old Moulton Ranch, years before the city incorporated in 1991. A large share of those tracts, including Nellie Gail Ranch, are governed by owners associations with architectural review committees that operate separately from city permitting.
The parcel itself drives many of the remaining decisions. Single-story tract homes with closed-off kitchen layouts affect where a detached unit can realistically sit, how far utilities need to run, and whether a garage conversion or a new detached build makes more sense. We walk the lot and assess setbacks, grade, and utility routes before any drawings begin.
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 Laguna Hills ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. A detached ADU is essentially a small house placed on a lot that already has a primary residence: foundation, framing, roof, electrical service, plumbing, a kitchen, and a bathroom all have to come together as one coordinated project. That full scope is exactly where a general building license is the right fit, because the work spans multiple trades from the ground up.
Most of the housing stock in Laguna Hills traces back to tract development that began in the early 1960s and ran through the 1980s, long before the city incorporated in 1991. That era of construction raises real coordination questions on an ADU project. Permits go through the City of Laguna Hills Community Development Department Building and Safety Division, and in neighborhoods like Nellie Gail Ranch, an owners association architectural review committee adds a parallel approval process we prepare for alongside the building permit.
We draw the plans, manage permitting, and build the structure ourselves rather than handing off between separate firms. That matters because design decisions and construction constraints are the same conversation. We also work in nearby Laguna Woods, Mission Viejo, and Aliso Viejo, and we are familiar with the subdivisions throughout Laguna Hills including Moulton Ranch, Aliso Meadows, and Indian Creek.
Schedule a Consultation
ADU Contractor Services in Laguna Hills
View Our ADU Contractor Areas of Service
ADU Contractor in Laguna Hills FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary home on your existing property, built as a backyard cottage, a converted garage, or an attached in-law suite. Adding one lets you bring in rental income, house extended family, or simply gain usable square footage. In Laguna Hills, where many tracts like Nellie Gail Ranch are governed by owners associations with architectural review committees, we coordinate approvals alongside the City of Laguna Hills permitting process so nothing gets missed.
How much does it cost to build an ADU in California?
Putting a number on an ADU project before we have walked your specific lot is not something we will do, because the cost depends on details no web page can capture: whether you are converting existing square footage or building a detached unit from the ground up, how far utility runs need to travel across your parcel, what site conditions exist, and the finish level you want. Many Laguna Hills homes were built in the 1960s through 1980s, and older construction often means unexpected conditions once work begins. After we see the property and confirm setbacks and utility connections, we give you a fixed scope and price you can hold us to. That is the only honest way to quote this work.
What we can explain now is where state law protects your budget. ADUs at or under 750 square feet of livable space are exempt from impact fees, and school fees apply only when the unit exceeds 500 square feet. Conversion projects and junior ADUs also carry limited connection fees because the state does not classify them as a new residential use. Building an ADU cannot trigger a fire sprinkler retrofit of your main house. One warning worth noting: the CalHFA ADU grant program is closed, its funding fully allocated, and the agency itself cautions that anyone offering to help you obtain an ADU grant is running a scam. Permits for ADU work in Laguna Hills go through the City of Laguna Hills Community Development Department Building and Safety Division, and if your home sits within Nellie Gail Ranch or another association tract, architectural review is a separate step we plan for from the start.
Do I need permits for an ADU in Laguna Hills?
An ADU always requires a building permit, though state law makes approval ministerial rather than discretionary, meaning no public hearing and no design review board stands between your application and a decision. In Laguna Hills, permit applications go to the City of Laguna Hills Community Development Department Building and Safety Division. The agency has 15 business days to confirm completeness and 60 days to approve or deny, a window that shortens to 30 days when a pre-approved plan is used. Keep in mind that many Laguna Hills tracts, including Nellie Gail Ranch, are governed by homeowners associations with architectural review committees that operate separately from city permitting. Horizon prepares and submits the full permit package and sees it through every inspection, so you are not left managing that process on your own.
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 Laguna Hills?
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 Laguna Hills, from design and permitting through the City of Laguna Hills Community Development Department to final construction, so your project meets code requirements and stays on 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 consultation, where we assess your property, talk through your goals, and deliver a detailed estimate. In Laguna Hills, where many tracts like Nellie Gail Ranch include architectural review committees, we help you navigate both HOA and city requirements from start to finish.
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.
Explore More in Laguna Hills
Horizon is a licensed Class B general building contractor serving Laguna Hills and the surrounding Orange County communities.
Other Services in Laguna Hills
ADU Contractors Nearby
Related Posts About ADU
