#1 ADU Contractor in Redlands
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units and home additions throughout Redlands, handling design coordination, budgeting, material selection, and permits from start to finish. Redlands carries eight locally designated historic districts where exterior work typically requires a Certificate of Appropriateness, and our team coordinates that review process alongside standard City of Redlands Building and Safety Division permitting. Projects range from detached backyard cottages to attached units and extra bedrooms, and every build is managed so structural and code requirements are met at each phase.
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 Redlands means working with someone who understands both state law and the local rules that can quietly complicate a project. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and updates effective January 1, 2026, changed how square footage is counted: the measurement now reflects interior livable space only. Once a complete application is submitted, the reviewing agency has 15 business days to confirm completeness and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review slow the process down.
In Redlands, applications go through the City of Redlands Building and Safety Division. That process is straightforward for most parcels, but the city has eight locally designated historic districts where any exterior alteration also requires a Certificate of Appropriateness evaluated against the Secretary of the Interior’s Standards. If your property sits within one of those districts, that review runs alongside the standard building permit process and shapes what the finished structure can look like from the street.
San Bernardino County adopted Development Code Chapter 84.36 at the Board of Supervisors on January 13, 2026, making it the most current county ADU ordinance we work under. Published standards allow an ADU between 200 and 1,200 square feet, a junior ADU up to 500 square feet, attached height up to 25 feet and detached up to 18 feet with two additional feet permitted to match an existing roof pitch. Side and rear setbacks are four feet, with five feet of required separation between detached structures. Two ADUs per lot are permitted, and properties of five acres or more may add three units.
Sewer connection determines feasibility on many parcels here. A sewer line within 200 feet of the property line triggers a required connection, and that distance increases by 100 feet for each additional dwelling unit added. Where sewer is not available, the project proceeds on septic or advanced treatment. We bring Environmental Health into the conversation before plans are drawn so that finding does not surface late and change the budget.
Redlands was built in distinct waves starting in 1888, and the housing stock reflects that history. Victorians, Craftsman bungalows, and early twentieth century homes from the citrus era sit alongside postwar ranch tracts, and the typical older home often has a small kitchen separated from the dining room by a load-bearing wall. That mix affects where a detached ADU can reasonably be placed on the lot and how far utilities need to run to reach it. We account for those site realities during the initial consultation so the plan we bring to the Building and Safety Division is grounded in what the property can actually support.
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 Redlands ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle ADU projects in Redlands from a single point of contact: one team draws the plans, submits to the City of Redlands Building and Safety Division, and carries the build through to final inspection. Keeping everything under one roof means fewer handoffs and a cleaner permit process for you.
Redlands presents specific considerations before design work begins. If your property sits within one of the city’s eight locally designated historic districts, such as the Smiley Park Historic District or the Eureka Street Historic District, exterior work typically requires a Certificate of Appropriateness reviewed against the Secretary of the Interior’s Standards. We account for that review process early so it does not stall your project later. On the feasibility side, we work through the practical questions first: sewer connection, access, and any fire hazard zone constraints that apply to your parcel.
State law provides some useful protections that apply regardless of where your property sits in Redlands. There is no owner-occupancy requirement tied to building an ADU, no sprinkler retrofit triggered on the main house, and no impact fees assessed on a unit with 750 square feet or less of interior livable space. We also build ADUs in Rialto, San Bernardino, and Twentynine Palms.
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ADU Contractor Services in Redlands
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ADU Contractor in Redlands FAQ
What is an ADU and why should I build one?
An accessory dwelling unit is a secondary home on your own lot, built as a backyard cottage, garage conversion, or in-law suite. Working with Horizon Construction and Remodeling on an ADU in Redlands lets you add rental income, house extended family, or gain usable living space on properties that stretch from Victorian-era lots near the Eureka Street Historic District to postwar ranch tracts.
How much does it cost to build an ADU in California?
What an ADU costs in Redlands depends on details no contractor can assess from a distance: whether you are converting an existing structure or building a detached unit from scratch, how much site work and utility extension your lot requires, and what finish level you want inside. What we can tell you is how state law limits certain costs. A unit 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 garage conversion or junior ADU are capped because the state does not classify those as a new residential use. Adding an ADU also cannot legally force a fire sprinkler retrofit on your existing home.
Redlands adds its own layer of complexity. Permits go through the City of Redlands Building and Safety Division, and if your property sits within one of the city’s eight locally designated historic districts, any exterior work on a conversion requires a Certificate of Appropriateness reviewed against the Secretary of the Interior’s Standards. That process affects scope and scheduling, and it is something we confirm during the property walk before we give you a fixed price. Anyone quoting a firm number before seeing the parcel is guessing. One point worth stating plainly: the CalHFA ADU grant program is closed and fully allocated, and the agency itself warns that anyone promising to help you obtain that grant is running a scam.
Do I need permits for an ADU in Redlands?
Yes, every ADU requires a building permit. In Redlands, that application goes to the City of Redlands Building and Safety Division, which follows state timelines of 15 business days for a completeness determination and 60 days to approve or deny. If the property relies on a septic system or a well, Environmental Health becomes part of the review. The sewer proximity rule also gets checked, and connection is required when a sewer line falls within 200 feet of the property line. Horizon manages the submittal, any correction responses, and all required 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 Redlands?
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 your ADU project in Redlands, from design and permitting through construction, coordinating the work so the finished unit meets building codes and stays within 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? Contact Horizon Construction & Remodeling Inc. to schedule a free consultation, where we assess your property, talk through your goals, offer design recommendations, and put together a detailed estimate before guiding you through every phase of your Redlands ADU project.
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Horizon is a licensed Class B general building contractor serving Redlands and the surrounding Orange County communities.
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