#1 ADU Contractor in Hermosa Beach
Custom Builds by Horizon Remodeling
Horizon Construction & Remodeling Inc. builds accessory dwelling units on residential properties in Hermosa Beach, handling design coordination, permitting, and construction under one general contractor. Because Hermosa Beach sits within the California coastal zone, projects here often require coastal review alongside the standard building permit through the City of Hermosa Beach Community Development Department, and we coordinate both processes on your behalf. The city’s original small beach lots call for careful planning, and we work within those constraints to deliver a finished ADU that fits your property and meets current code.
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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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Finding the right adu contractor in Hermosa Beach means working with a team that understands both California’s current ADU statutes and the specific permit path this city requires. State law governing ADUs now lives in Government Code sections 66310 through 66342, and revisions that took effect January 1, 2026 changed how square footage is measured, counting only interior livable space. Under those rules, the reviewing agency has 15 business days to confirm an application is complete and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review.
For a property here, that application goes to the City of Hermosa Beach Community Development Department Building and Safety Division. One layer this city adds that most inland cities do not: Hermosa Beach sits within the California coastal zone and maintains a Local Coastal Plan, so a coastal review can run alongside the building permit rather than after it. That parallel process affects timing, and we factor it into every project schedule before we commit to anything on paper.
Local ordinances are not always current with state law, which is worth keeping in mind when reading any summary of rules. The lot itself resolves most of the practical questions. Hermosa Beach was platted in the early 1900s after the city incorporated in 1907, and the houses that exist today sit on those original small lots. The narrow, multi-level format common throughout the city, with living areas pushed to upper floors for light and views, directly shapes where a detached unit can be placed, how far utilities need to run, and whether a garage conversion makes more sense than new construction. We walk each parcel and check setbacks, grade, equipment access, and utility routes before any drawings begin.
State law sets a floor of protections that applies city by city. A local agency cannot cap an ADU below 850 square feet of interior livable space, or below 1,000 square feet if the unit has more than one bedroom. Side and rear setbacks cannot exceed four feet. Owner-occupancy cannot be required as a condition of building an ADU. Adding a unit cannot trigger a fire sprinkler retrofit of the main house. And there are no impact fees on a unit of 750 square feet or less.
Those protections give property owners a meaningful baseline, but the coastal zone and the small-lot reality here mean that translating the baseline into a buildable plan takes careful site analysis. We coordinate the permit process, bring in appropriately licensed subcontractors for the trade-specific portions of the work, and stay with the project through the final inspection.
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 Hermosa Beach ?
Horizon Construction and Remodeling is a licensed Class B general building contractor, bonded, and in business since 2009. We handle ADU projects in Hermosa Beach from initial drawings through final inspection, with one team managing the plan, the agency submissions, and the build itself.
Hermosa Beach presents its own set of site realities. The city’s original beach subdivision lots from the early 1900s are narrow, and the homes that occupy them today are typically multi-level structures with living spaces stacked vertically to capture light. Adding an ADU on that kind of parcel means working out utility routing, access, and structural fit before a single drawing goes to the City of Hermosa Beach Community Development Department Building and Safety Division. Because the city sits within the California coastal zone and maintains a Local Coastal Plan, coastal review can layer on top of the standard building permit, and we account for that in the submittal timeline.
We coordinate all specialty trade work through appropriately licensed subcontractors and build ADUs throughout the South Bay, including near the Strand, Pier Avenue, Hermosa Avenue, and the Hermosa Valley Greenbelt corridor.
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ADU Contractor Services in Hermosa Beach
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ADU Contractor in Hermosa Beach 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 detached backyard structure, a garage conversion, or an attached in-law suite. Adding one with Horizon Construction gives Hermosa Beach homeowners a way to generate rental income, house family members, or gain usable square footage on lots where the original beach subdivision layout left little room to grow.
How much does it cost to build an ADU in California?
What an ADU costs in Hermosa Beach depends on details no contractor can assess from a distance: whether you are building a detached unit or converting existing space, how much site work the lot requires, where utilities need to run, and the finish level you choose. On those original small beach lots the city platted in the early 1900s, utility routing and setback constraints can vary significantly from one parcel to the next, so any firm quote issued before a site visit is little more than a guess. We walk the property first, confirm what the lot actually allows, and then give you a fixed scope and price you can hold us to.
Understanding where the money goes helps you plan realistically. State law exempts ADUs of 750 square feet or less of interior livable space from impact fees, limits school fees to units above 500 square feet, and restricts connection fees for conversions and junior ADUs because the state does not classify those as a new residential use. Building an ADU also cannot force a fire sprinkler retrofit on your existing house. One thing 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 an ADU grant is running a scam.
Do I need permits for an ADU in Hermosa Beach?
An ADU always requires a building permit, though state law makes approval ministerial rather than discretionary, meaning there is no hearing and no design review board to satisfy. In Hermosa Beach, applications go to the City of Hermosa Beach Community Development Department Building and Safety Division, and because the city sits within the California coastal zone under a Local Coastal Plan, coastal review may layer on top of the standard building permit process. State law allows 15 business days for a completeness determination and 60 days for a final decision, with any denial required to specify deficiencies and how to correct them; submitting a pre-approved plan shortens that window to 30 days. We prepare and submit the permit package and carry it through every inspection so the process does not land 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 Hermosa Beach?
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, and construction as a single coordinated process, managing each phase so your project meets building codes and stays within budget. On the small beach lots that define most of Hermosa Beach, that includes navigating both City of Hermosa Beach building permits and any applicable coastal review under the Local Coastal Plan.
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. On Hermosa Beach’s small coastal lots, where coastal zone review often layers on top of the standard building permit, knowing what you’re getting into from the start matters. We guide you through every phase after that.
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Horizon is a licensed Class B general building contractor serving Hermosa Beach and the surrounding Orange County communities.
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