Trusted ADU Builders for Home Gardens Homeowners
Home Gardens homeowners exploring an accessory dwelling unit face a confusing market: prefab brands, modular factories, site-built contractors, and permit requirements that vary by lot. Holloway ADU Builders exists to cut through that noise. We’re an ADU specialist, not a general contractor who dabbles in backyard units. Led by Neil Trescott, our team matches you to the right construction method for your lot, budget, and timeline, then delivers the project through completion, including interior finishes. Call (855) 617-6356 to talk through your options with someone who knows Home Gardens specifically.
Key Takeaways
- We work with six major prefab and modular ADU brands, including Abodu, Cover, and Dvele, so you’re never locked into one option.
- Site-built, prefab, modular, and Tuff Shed conversions all fall within our scope.
- Kitchen and bathroom finishing is handled by our team, not a second contractor.
- Free estimates on every ADU project in Home Gardens. No obligation, no pressure.
ADU Construction
ADU Construction in Home Gardens means building a fully permitted secondary dwelling on a lot that already has a primary residence. You’re considering it because the numbers work, whether that’s rental income, multigenerational housing, or a dedicated home office. Our ADU Builders in Tustin handle the entire build, from site prep and foundation through framing, mechanicals, and move-in-ready finishes. Construction costs in this part of Riverside County typically start around $180,000 for a modest one-bedroom conversion and run well past $450,000 for a custom two-bedroom site-built unit with premium finishes. The right number depends on your lot conditions, utility runs, and chosen construction method.
Site-Built vs. Factory-Built
Site-built ADUs are framed on your property and offer the most design flexibility. Factory-built options, including modular and panelized systems from manufacturers like Cover and Dvele, reduce on-site construction time significantly.
We’ll walk you through the real cost and schedule trade-offs for each approach, based on your specific lot in Home Gardens.
Utility and Site Preparation
Many Home Gardens lots require sewer line extensions, electrical panel upgrades, or new water service connections before construction begins. These costs are easy to underestimate and often surprise homeowners who price ADUs online.
Our team evaluates your site conditions during the free estimate so the number we give you reflects actual conditions, not a generic brochure.
Detached ADU
Detached ADU refers to a standalone structure built apart from the main house, usually in the backyard or side yard. Homeowners choose this route when they want clear separation from the primary residence, or when the existing home has no garage or basement to convert. Detached units in Home Gardens commonly run 400 to 1,200 square feet under state and local ADU rules. Pricing for a detached ADU here typically lands between $220,000 and $400,000 depending on size, finish level, and whether you choose prefab, modular, or site-built, and Holloway ADU Builders manages all three paths.
Backyard Space and Setbacks
Setback requirements in Home Gardens govern how close a detached ADU can sit to property lines, and many lots have easements that complicate placement. Our experience with Riverside County setbacks means we can quickly tell you whether your backyard can accommodate the size of unit you want.
We’ll measure and assess during the initial estimate, before you spend money on plans.
Exterior Cladding Choice
Detached units need exterior materials that hold up to the inland Southern California climate: hot summers, occasional heavy rain, and UV exposure. We frequently specify James Hardie fiber cement siding for detached ADUs because it resists warping and fading far better than vinyl.
It also lets us match the ADU’s exterior to your main home, which matters for property value.
JADU
JADU stands for Junior Accessory Dwelling Unit, a smaller unit created within the existing footprint of your primary residence, typically by converting a bedroom, attached garage, or bonus room. JADUs max out at 500 square feet and offer the most affordable path into ADU ownership in Home Gardens. You’re looking at $60,000 to $140,000 for a permitted JADU conversion with a small kitchen and its own entrance. Holloway ADU Builders handles these conversions from initial feasibility check through final inspection, and because we also do kitchen and bathroom remodeling, the JADU’s interior is finished under our roof, not a separate contractor’s.
Attached Garage Conversions
Converting an attached garage into a JADU is the most common JADU scenario we see in Home Gardens. The structure already exists, which means the savings are real: no foundation, no new roof, no exterior walls to build.
We’ll verify that your garage’s ceiling height, electrical service, and access meet JADU requirements before you commit.
Separate Entrance Requirements
A JADU needs its own entrance, either from the exterior or from a shared interior hall. On many Home Gardens homes built in the 1970s and 1980s, this requires adding a door to an exterior wall or reconfiguring an interior hallway.
We handle the design and permitting for these changes as part of the overall JADU scope.
ADU Plans
ADU Plans are the architectural and engineering drawings required for permit submission and construction in Home Gardens. Every ADU project needs them, regardless of whether the structure is prefab, modular, or site-built, and they typically cost $8,000 to $20,000 depending on complexity and the design professional involved. Holloway ADU Builders manages the plan development process as part of our full-service scope. We’ll coordinate with architects and engineers who understand Riverside County requirements, and for prefab and modular units from brands like Abodu and Cover, we use manufacturer drawings adapted to your site, which keeps plan costs efficient.
Municipal Permitting in Home Gardens
Home Gardens falls under unincorporated Riverside County jurisdiction, which has its own ADU plan review process. Requirements around fire sprinklers, solar readiness, and site drainage differ from what homeowners in nearby incorporated cities face.
Our familiarity with county submittals means fewer revision cycles and fewer permit delays.
Plan Sets for Manufacturer-Built Units
If you go with a prefab or modular ADU from a brand like Abodu or Dvele, the manufacturer supplies base structural drawings. Your site plan, foundation design, and utility connections still need local engineering stamps.
We coordinate both sides so your permit package is complete the first time it gets submitted.
ADU Contractor
ADU Contractor is the role Holloway ADU Builders fills for Home Gardens homeowners: the licensed, insured professional who holds the construction contract, pulls permits, schedules inspections, and manages every trade on site. Most ADU projects involve five to eight separate trades, from concrete and framing to electrical, plumbing, HVAC, and finish carpentry. Our company is structured around the ADU process specifically, which means the subcontractors we bring to your project already understand ADU scopes and timelines. General remodelers often underestimate ADU-specific requirements like separate address establishment, electrical submetering, and minimum ceiling heights, and those mistakes cost time and money—something our ADU Builders Troubleshooting: Common Problems and How to Fix Them guide covers in detail.
Single Point of Accountability
When Holloway holds the contract, you call us about everything: permit status, schedule, change orders, finish selections. There’s no ping-ponging between a general contractor and a separate ADU consultant.
Neil Trescott oversees each Home Gardens project directly, and you’ll have his phone number from the first meeting.
Managing Multiple Trades Efficiently
ADU sites are tighter than typical residential projects: smaller work areas, tighter access, and less room for material staging. We sequence trades carefully so you’re not paying electricians and plumbers to wait on each other.
This is the kind of scheduling discipline that comes from focusing on ADUs rather than treating them as a side job.
ADU Design
ADU Design is the process of shaping your unit’s size, layout, orientation, and finish level before plans are drawn. Good ADU design in Home Gardens considers lot orientation, existing home architecture, privacy between the main house and the unit, and what the space will actually be used for day to day. Design fees range from $5,000 to $15,000 for custom work, though many prefab and modular configurations from manufacturers like Cover and Dvele include design customization at lower cost. Holloway ADU Builders guides you through this stage with vendor-neutral advice, because the right design depends on your lot and goals, not on whichever brand pays the highest margin.
Layouts That Maximize Rentability
If rental income is the goal, design decisions like separate entrances, private outdoor space, and closet count directly affect what you can charge. We help Home Gardens homeowners prioritize features that translate into real rental value, not just visual appeal.
A well-designed 500-square-foot one-bedroom consistently outperforms a cramped 700-square-foot two-bedroom on the rental market.
Matching the Primary Residence
Home Gardens has a mix of ranch-style homes from the 1960s and 1970s, plus newer builds closer to the Chino border. Exterior materials and roof lines that match the main house make an ADU look intentional rather than tacked on.
James Hardie siding in colors that complement your existing exterior is one of our most common specifications for this reason.
Backyard ADU
Backyard ADU is the term most Home Gardens homeowners use for a detached structure built in the rear yard, as opposed to a garage conversion or JADU. It’s the most flexible option: you choose the size, the placement, the orientation, and the construction method without working around the constraints of the existing home. Backyard ADUs in this area typically cost $220,000 to $420,000 all-in, depending on whether you choose a Tuff Shed conversion, a factory-built unit from a manufacturer like Abodu, or a fully custom site-built structure. Holloway ADU Builders has navigated all of these paths and can show you the trade-offs without pushing you toward one.
Tuff Shed Conversion Route
For homeowners who want to minimize cost, converting a Tuff Shed into a permitted ADU is a real option, though the savings come with more design and engineering work. The base structure costs substantially less than a foundation-built building, but you’ll still need insulation, electrical, plumbing, and a proper foundation system.
We’ll give you an honest comparison between a Tuff Shed conversion and a manufactured ADU so you can decide with numbers in hand.
Prefabricated Units in the Backyard
Factory-built units from brands like Abodu and Dvele arrive on your property largely complete, which reduces on-site construction time from months to weeks. Some Home Gardens lots with narrow side yards create crane or delivery access challenges that we identify early.
Our site assessments catch these issues during the estimate phase, not on delivery day.
Brands We Service
Holloway ADU Builders works with some of the most established names in factory-built housing. Abodu units are popular for their streamlined permitting path and consistent quality control, and we’ve managed multiple Abodu installations across the Inland Empire. Cover and Dvele represent the high-performance end of the modular market, with tighter envelopes and more design customization than entry-level prefab options.
We’re also equipped to handle Tuff Shed conversions and fully site-built structures with James Hardie exteriors. Our job is to match you to the right approach for your lot in Home Gardens, not to sell you a brand. Whether you’re leaning toward Abodu, Dvele, a Cover unit, or a custom build, we can manage the project from permit approval to final inspection.
Signs You Need a Pro Right Now
- Your lot already has utilities but you haven’t verified capacity. Many Home Gardens homes built before 1990 have 100-amp electrical panels. An ADU with a kitchen, bathroom, and HVAC can push demand past that limit, and upgrading to 200 amps adds real cost. Getting a professional assessment now prevents budget surprises later.
- You’ve received wildly different price quotes from different companies. Wide quote gaps usually mean different scopes, not different levels of honesty. One contractor may exclude sewer line work, another may not include finish flooring. A pro can line-item every quote so you’re comparing apples to apples.
- You’re unsure whether your property qualifies for an ADU. Lot size, setback requirements, and existing easements vary from parcel to parcel in Home Gardens. County rules are specific, and a wrong assumption can kill a project before it starts. We verify feasibility before you spend any money on plans.
- You’re comparing prefab, modular, and site-built but can’t decide. Each method has real trade-offs in cost, timeline, and finish quality. The right answer depends on your lot constraints and goals, not on a salesperson’s commission structure. We give you the vendor-neutral comparison that the manufacturers themselves can’t provide.
- You want one contractor for the ADU shell and the interior finishes. Many ADU contractors stop at drywall, leaving you to find a separate kitchen and bath remodeler. Holloway handles the entire scope, from foundation to finished kitchen, so there’s one warranty conversation and one phone number to call.
Our Process, Step by Step
- 1
Initial consultation and lot assessment. We walk your Home Gardens property, review your lot dimensions and existing utility connections, and discuss how you plan to use the ADU. This visit determines which construction methods are viable and gives us enough information to give you a realistic budget range, not a teaser number.
- 2
Vendor and method comparison. We evaluate prefab options from Abodu, Cover, and Dvele alongside modular, site-built, and Tuff Shed conversion paths. You’ll see cost and timeline comparisons side by side, with our recommendations based on your lot and goals. No brand gets pushed because of a dealer margin.
- 3
Design and permit submittal. We coordinate with architects and engineers to produce your ADU plans and submit them to Riverside County. Our familiarity with county ADU requirements reduces the back-and-forth that slows down first-time applicants. We also handle address establishment and utility applications.
- 4
Construction and site management. Our team schedules trades in the right sequence, manages material deliveries, and communicates with you at every milestone. For prefab and modular units, we prepare the site and foundation before the factory-built structure arrives, then complete connections and finishes after installation.
- 5
Interior finishing and final inspection. Kitchens, bathrooms, flooring, and trim are completed by our own remodeling team, not a third party. We schedule the final county inspection, walk the unit with you, and address any punch list items before we call the project complete.
How Much Does ADU Builders Cost in Home Gardens?
ADU construction costs in Home Gardens vary widely by method and scope. A permitted JADU conversion can start around $60,000, while a detached site-built two-bedroom ADU with premium finishes can exceed $450,000. Most homeowners we work with land somewhere between $180,000 for a garage conversion and $350,000 for a mid-range detached prefab or modular unit. The widest swing comes from choosing between factory-built and site-built construction: prefab units from manufacturers like Abodu and Dvele reduce on-site labor, while custom site-built ADUs give you full design control at a higher cost.
What affects the price most: utility upgrades (electrical panels, sewer connections), site conditions (slope, drainage, access), finish level, and whether you choose a shed conversion, factory unit, or custom build. To avoid overpaying, get line-item quotes from any contractor you consider and ask what’s excluded. A low quote that omits sewer work or electrical upgrades will cost more in change orders later. Our free estimates in Home Gardens include a full scope breakdown with real numbers, not rounded averages. Let Neil and the team walk your lot and give you a price you can actually build to.
Our Service Area Near Home Gardens
Beyond Home Gardens, we serve ADU Builders in Chino and ADU Builders in Norco, along with Eastvale, Pomona, Ontario, Montclair, Jurupa Valley, La Verne, Claremont, Pedley, and Upland. If you’re in the wider Inland Empire or western Riverside County, chances are we’ve built near you. ADU Builders in Home Gardens reach most of this territory within a 30-minute drive for site visits and consultations. Back at home, every project starts the same way: a conversation about your lot and what you’re trying to accomplish.
Serving Home Gardens, CA — Our Local Coverage Area
We’re based in the Home Gardens area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
Frequently Asked Questions About ADU Builders in Home Gardens
An ADU builder is a contractor who specializes in accessory dwelling units rather than treating them as a side project. This specialization matters because ADUs have specific permitting, utility, and floor plan requirements that differ from standard home construction. Holloway ADU Builders focuses on ADUs as our primary niche. We handle prefab, modular, site-built, and shed conversion projects from planning through final inspection.
A typical detached ADU project in Home Gardens takes 8 to 16 months from initial consultation to final inspection, depending on the construction method. Site-built units take the longest because every phase happens on your property. Prefab and modular units from manufacturers like Abodu and Dvele can shorten on-site construction significantly, though permit review times are similar regardless of method. Call (855) 617-6356 to get a realistic timeline for your specific project.
ADU costs in Home Gardens range from about $60,000 for a small JADU conversion to over $450,000 for a custom two-bedroom detached unit. Most projects fall between $180,000 and $350,000. The biggest variables are construction method, site conditions, utility upgrades, and interior finish level. Our free estimates include a detailed line-item breakdown so you know exactly where the money is going before you commit to anything.
Yes, we’re authorized to work with all three brands plus several other leading prefab and modular manufacturers. Our relationship with these companies means we can give you honest comparisons between their products without a sales agenda. We’ll help you decide which unit fits your lot, budget, and timeline, then manage the entire installation and finishing process. Your choice, our execution.
Yes, and this is one of our biggest differentiators. Many ADU contractors stop at the building shell, leaving you to hire separate kitchen and bathroom remodelers. Our team handles the entire scope: the ADU structure plus the kitchen, bathroom, flooring, and finish work that makes it livable. One contract, one team, one phone number to call if anything needs attention. Estimates are free, so you can see the full picture before deciding.
Start with three things: your parcel number or address for a quick property check, a rough idea of your budget, and clarity on how you’ll use the unit, whether that’s rental income, family housing, or a home office. Property records help us check lot size and zoning before our first visit. Your budget and intended use shape the entire conversation about size, method, and finish level. (855) 617-6356 is the number to call to start that conversation.
We operate as licensed contractors in California and carry the insurance coverage required for residential construction in Riverside County. Our work in Home Gardens and the surrounding cities is permitted, inspected, and completed to code. We encourage every homeowner to verify any contractor’s license status before signing, and we’re happy to provide our credentials when we meet for your estimate.
Schedule Your ADU Builders Service in Home Gardens Today
If you’re serious about building an ADU in Home Gardens, the next step is a conversation with Neil Trescott and our team. We’ll walk your property, assess your options honestly, and give you real numbers for the construction method that fits. No pressure, no brand agenda, no vague estimates. Call (855) 617-6356 to schedule your free, no-obligation ADU estimate today.
Written by Neil Trescott, Owner at Holloway ADU Builders, serving Home Gardens and the surrounding Inland Empire region.