#1 ADU Contractor in Loma Linda
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout Loma Linda, managing design, permitting through the City of Loma Linda Building and Safety Division, material selection, and budgeting from the first meeting through the final walkthrough. Many of the older single-story ranch homes near the Anderson Street corridor and the university medical campus district have underused rear yards well suited to a detached backyard unit or a garage conversion, and we coordinate every licensed trade involved in that work. On lots that rise toward the South Hills, we pay close attention to grading and drainage as part of the overall scope.
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 Loma Linda means working with someone who understands both state law and the local conditions that shape what you can actually build. California reorganized its ADU statutes into Government Code sections 66310 through 66342 in 2024, and further changes took effect January 1, 2026. Square footage is now measured as interior livable space rather than overall footprint, and agencies have 15 business days to determine whether an 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 complete application and a decision.
In Loma Linda, that application goes to the City of Loma Linda Building and Safety Division. We put that submittal together carefully because an incomplete package resets the clock. San Bernardino County also adopted a new ADU chapter, Development Code Chapter 84.36, at the Board of Supervisors on January 13, 2026, making it the most current county ADU ordinance among the areas we serve.
The county standards allow a detached ADU from 200 up to 1,200 square feet, a junior ADU up to 500 square feet, attached height to 25 feet, detached height to 18 feet with two additional feet permitted to match an existing roof pitch, and four-foot side and rear setbacks with five feet of separation between detached structures. Two provisions stand out compared to coastal counties: two ADUs are allowed per lot, and properties of five acres or more may add three units.
Sewer availability decides feasibility on many parcels before anything else does. Connection is required when a sewer line runs within 200 feet of the property line, with that distance increasing by 100 feet for each additional dwelling unit. Where sewer does not reach, septic or advanced treatment applies. We bring Environmental Health into the conversation before a plan is drawn so that question is answered early.
The physical lot shapes the rest of the project. Loma Linda grew steadily around the Seventh-day Adventist medical campus after incorporating in 1970, and that history shows in the housing stock. Older single-story ranch houses in the established tracts have closed-off kitchens and utility runs that were never planned with a second unit in mind, which affects where a detached structure can sit and how far new lines have to travel. The southern third of the city rises into the protected South Hills open space, and San Timoteo Creek has flooded the area twice in recorded history, in 1969 and again in 2010. On hillside lots in that part of the city, grading plans and drainage details get real scrutiny, and we account for that before the first sketch goes to the Building and Safety Division.
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 Loma Linda ?
Horizon Construction and Remodeling builds ADUs in Loma Linda as a licensed Class B general building contractor, bonded, with more than 15 years of design-build work behind us. We handle the plan, run it through the City of Loma Linda Building and Safety Division, and build the unit. Keeping everything under one company removes the hand-off problems that slow most projects down.
Feasibility questions come before design questions on every lot we evaluate. In the older single-story ranch tracts near the Anderson Street corridor and the Loma Linda University Medical Center district, that means checking sewer connections and access. On lots that rise into the South Hills, hillside grading and drainage require early attention, particularly where San Timoteo Creek flooding has historically affected lower-lying parcels. Those site conditions shape the structure before a single plan sheet is drawn.
California state law protections apply to every parcel in the city: there is no owner-occupancy requirement for an ADU, building one does not trigger a sprinkler retrofit of the main house, and units with 750 square feet or less of interior livable space are not subject to impact fees. We also build ADUs in Montclair, Needles, and Ontario.
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ADU Contractor Services in Loma Linda
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ADU Contractor in Loma Linda FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary residence built on your existing property, taking the form of a backyard cottage, a converted garage, or an attached in-law suite. Building an ADU in Loma Linda lets you add rental income, house extended family, or simply gain usable space, and on lots near the South Hills, Horizon coordinates the grading and drainage work those sites typically require.
How much does it cost to build an ADU in California?
What an ADU costs in Loma Linda depends on details no contractor can assess from a website alone. The unit size, whether you are converting an existing structure or building a detached addition on a fresh foundation, the finish level you select, and the site work your specific lot demands all drive the final number. Lots along the South Hills rise or near San Timoteo Creek can carry grading and drainage requirements that flat tracts in the older ranch-house neighborhoods near the Anderson Street corridor simply do not, and those conditions affect both budget and scope. We walk every parcel before quoting anything, confirm setbacks and utility connections with the City of Loma Linda Building and Safety Division, and then give you a fixed scope and price you can hold us to. Anyone offering a firm figure before seeing the property is guessing.
State law does offer meaningful cost protections worth understanding before you budget. An ADU at or under 750 square feet of livable interior space is exempt from local impact fees, and 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, and adding an ADU cannot force a fire sprinkler retrofit on your existing home. One caution: the CalHFA ADU grant program is closed and fully allocated, and the agency itself warns that anyone offering to help you obtain an ADU grant is running a scam.
Do I need permits for an ADU in Loma Linda?
Yes, every ADU requires a building permit, and in Loma Linda that application goes to the City of Loma Linda Building and Safety Division. State law sets the review clock at 15 business days for a completeness determination and 60 days for an approval or denial, and the city’s process follows those timelines. On lots near San Timoteo Creek or rising into the South Hills, grading and drainage plans draw added scrutiny during review. Environmental Health joins the process when septic or a well is involved, and the sewer proximity rule is checked on every submittal, since connection is required when a sewer line falls within 200 feet of the property line. We manage the application, the correction rounds, and the inspections.
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 Loma Linda?
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 Loma Linda, from initial design through permits with the City of Loma Linda Building and Safety Division to finished construction, keeping the project on budget and built to code throughout.
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 Loma Linda? Call us at (714) 449-9035 to set up a free estimate, and we will walk your property, talk through your goals, and give you a clear, detailed plan covering every phase of the project.
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Horizon is a licensed Class B general building contractor serving Loma Linda and the surrounding Orange County communities.
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