#1 ADU Contractor in Upland
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and room additions for homeowners across Upland, handling design coordination, permit applications through the City of Upland Building and Safety Division, and construction across every trade involved. The city’s housing runs from Craftsman bungalows in the historic core near Old Town and the Arrow and Laurel Bungalow District to postwar ranch homes that spread through the city after 1954, and each era calls for a different approach. Where a property sits on the local historic register, exterior work typically requires a Certificate of Appropriateness before construction can begin, and we factor that into planning 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.
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Finding the right adu contractor in Upland means working with a team that understands both the state law governing these projects and the local conditions that shape what is actually buildable on your parcel. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and those rules were updated again on January 1, 2026. Under the current framework, square footage is calculated as interior livable space, and the reviewing agency has 15 business days to determine whether a submitted application is complete, followed by 60 days to approve or deny it.
Approval is ministerial under state law, meaning no public hearing and no discretionary design review applies to most ADU applications. For Upland properties, that application goes directly to the City of Upland Building and Safety Division. Knowing which documents that office expects, and in what format, keeps a project moving inside those statutory windows rather than sitting in a correction cycle.
Upland carries a significant historic preservation layer that adds a step many homeowners do not anticipate. The city maintains nine locally designated historic districts and a local register of more than 580 properties. Any exterior change on a listed parcel requires a Certificate of Appropriateness before permits can proceed, so we identify historic status at the very start of planning rather than discovering it mid-design.
Sewer availability is the feasibility question on a great many lots here. 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 is not accessible, the project moves to septic or advanced treatment, and we bring Environmental Health into the conversation before a plan is drawn.
The era in which a home was built shapes the rest of the site analysis. Older Craftsman bungalows from Upland’s citrus-town core often have a small rear service area that influences where a detached unit can sit and how far utilities must run. Postwar ranch homes from the expansion that followed the San Bernardino Freeway opening in 1954 present a different footprint and layout, but the same question applies: the lot decides what is practical before design choices come into play.
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 Upland ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle the full scope of an ADU project under one roof: drawing the plans, submitting to the City of Upland Building and Safety Division, and carrying the work through to a final inspection. Because Upland has nine locally designated historic districts and a local register covering more than 580 properties, we address the Certificate of Appropriateness requirement early, before any exterior design decisions are locked in.
Upland’s housing stock shapes how every ADU conversation starts. A Craftsman bungalow in the Arrow and Laurel Bungalow District or a period cottage near Old Town Upland often sits on a lot with an existing service area at the rear, which can influence where a detached or attached unit fits. Postwar ranch homes along the corridors that grew after 1954 present a different set of conditions. We work through the site-specific feasibility questions first, so the design that follows is grounded in what the parcel can actually support.
California state law protections apply regardless of which neighborhood your property is in: no owner-occupancy requirement, no sprinkler retrofit of the main house triggered by adding an ADU, and no impact fees on a unit with 750 square feet or less of interior livable space. Specialty trade portions of each project are performed by appropriately licensed subcontractors we coordinate directly.
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ADU Contractor Services in Upland
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ADU Contractor in Upland FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a self-contained secondary residence on your property, taking the form of a backyard cottage, a converted garage, or a suite attached to the main house. In Upland, where the housing stock ranges from early Craftsman bungalows near Old Town to postwar ranch homes, an ADU can add rental income, multigenerational living space, or both.
How much does it cost to build an ADU in California?
ADU costs in Upland shift depending on factors no contractor can assess from a distance: the unit size, whether you are converting existing space or building a new detached structure, how much site and utility work your specific lot requires, and the finish level you select. What state law does spell out is where your money is protected. Any ADU at or under 750 square feet of livable space is exempt from local impact fees. School fees only apply once you exceed 500 square feet of interior space. Conversion units and junior ADUs carry limited connection fees because the state does not classify them as a new residential use, and adding an ADU cannot force a fire sprinkler retrofit on your existing home.
In Upland, the permit path runs through the City of Upland Building and Safety Division, and for properties on the local historic register or within one of the city’s nine designated historic districts, exterior changes also require a Certificate of Appropriateness before work can begin. That review adds a step worth planning for, particularly on older Craftsman bungalows or period cottages in areas like Old Town or the Arrow and Laurel Bungalow District. Any contractor quoting a firm number before walking your parcel and confirming setbacks and utility connections is guessing. We review the site first, then give you a fixed scope and price. One caution worth stating plainly: 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 Upland?
Yes, every ADU requires a building permit, and in Upland that application goes through the City of Upland 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 decision. If your property relies on a septic system or a private well, Environmental Health becomes part of that review process. The city also enforces a sewer proximity rule requiring connection when a public sewer line runs within 200 feet of the property line. Upland’s nine locally designated historic districts and a local register covering more than 580 properties add another layer, since exterior changes on those properties require a Certificate of Appropriateness before permits move forward. Horizon manages the full submittal process, handles correction responses, and coordinates all required inspections on your behalf.
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 Upland?
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 Upland Building and Safety Division, and construction from start to finish, keeping the project within budget and code, including Certificate of Appropriateness review for properties on the city’s local historic register.
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 set up a free consultation, where we assess your property, talk through your goals, and deliver a detailed estimate covering every phase of your ADU project in Upland, including any Certificate of Appropriateness requirements if your home sits within one of the city’s nine locally designated historic districts.
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Horizon is a licensed Class B general building contractor serving Upland and the surrounding Orange County communities.
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