ADU Construction in Riverside County, CA
Serving Murrieta, Temecula, Menifee, Hemet, and the greater Riverside County area, Honeywill Construction builds garage conversions, detached ADUs, and custom in-law units with trusted craftsmanship.
About Our ADU Construction Services
At Honeywill Construction, we build custom Accessory Dwelling Units (ADUs) that deliver added space, flexibility, and long-term value. Whether you’re planning a detached guest house, converting a garage, or building a rental-ready unit, our experienced team is here to help bring your project to life.
As a licensed California ADU contractor and veteran-owned, family-operated company, we’ve proudly served homeowners across Murrieta, Temecula, Menifee, Hemet, Palm Springs, and the greater Riverside County areasince 1999.
From design and permitting to construction and final inspection, we handle every detail with expert craftsmanship, transparent communication, and a deep commitment to building ADUs that match your goals and enhance your property.
Our ADU Construction Process:
Detached ADU Construction
We build fully detached ADUs ideal for rentals or guest space. Our team manages everything from design to final inspection, delivering a move-in-ready unit that adds value and flexibility to your Riverside County property.
Garage Conversion ADUs
Turn your existing garage into a permitted, livable ADU. We handle structural upgrades, insulation, utilities, and finishes to create a comfortable space that blends seamlessly with your home.
Attached ADU Additions
An attached ADU shares at least one wall with your main home, offering convenience and cost efficiency. We design and build fully integrated units tailored to your layout and lifestyle needs.
Junior ADUs (JADUs)
Junior ADUs are compact units created within the footprint of your existing home. Perfect for in-laws, caregivers, or home offices, JADUs include a small kitchen and separate entrance.
Custom ADU Kitchens & Baths
We design and build efficient ADU kitchens and bathrooms using custom cabinetry, space-saving layouts, and premium fixtures—all built to suit the unit’s footprint and your style.
Permit-Ready & Energy Efficient Builds
From zoning research to Title 24 energy compliance, we manage all permitting and upgrades to ensure your ADU meets California codes and performs efficiently for years to come.
Why Homeowners Choose Honeywill Construction for ADU Projects
- Over 25 Years of Residential Construction Experience
Trusted by Riverside County homeowners since 1999.
Licensed California ADU Contractor (#790150)
Fully licensed, bonded, and insured for ADU construction in CA.
Precision Craftsmanship & Reliable Quality
Built with care, backed by our reputation for excellence.
Custom Interiors & Premium Finish Options
Tailored kitchens, bathrooms, and layouts for every ADU.
Clean, Respectful Worksites & On-Schedule Delivery
We protect your property and complete projects on time.
ADU CONSTRUCTION IN RIVERSIDE COUNTY THAT DELIVERS REAL VALUE
They communicated every step clearly, stayed on schedule, and the craftsmanship was excellent—especially in the kitchen and bathroom they built into the unit. We now have a beautiful, income-generating rental that adds real value to our property.
We highly recommend Honeywill to anyone considering an ADU in Riverside County."
OUR ADU CONSTRUCTION PROCESS
Discovery Call & Site Evaluation
We start by understanding your goals. During your free consultation, we’ll review your property layout, zoning conditions, and ADU goals—whether rental, guest house, or multigenerational use—and provide expert guidance based on Riverside County regulations.
Custom ADU Design & Detailed Estimate
You’ll receive a clear, itemized estimate along with layout recommendations, finish options, and space-saving solutions. For larger ADUs, we can include architectural drawings or 3D renderings to help you visualize your new unit before construction begins.
Permitting, Construction & Project Management
Once approved, our licensed team manages every phase—from plans, permits, and site prep to vertical construction, interiors, and final utilities. We ensure clean job sites, proactive communication, and expert craftsmanship throughout your ADU build.
Final Walkthrough & Client Approval
We’ll walk you through your completed ADU to ensure everything meets our quality standards—and yours. Your project isn’t finished until you’re fully satisfied with your new living space.
BUILT ON INTEGRITY. TRUSTED FOR ADU Construction.
We don’t just talk quality—we’re licensed, vetted, and backed by 5-star reviews from Riverside County homeowners.
ADU Construction in Riverside County and Beyond
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Honeywill Construction proudly provides custom ADU design and construction services throughout::
Hemet, Menifee, Temecula, Murrieta, Idyllwild, Palm Springs, Riverside, Moreno Valley, and surrounding communities across Riverside County, and the Inland Empire California.
Riverside County ADU FAQ
What is an ADU and is it legal to build in Riverside County?
An ADU (Accessory Dwelling Unit) is a self-contained residential unit located on the same lot as a single-family or multifamily home. It typically includes a kitchen, bathroom, and sleeping area. ADUs are legal in Riverside County under California’s state housing laws, and local municipalities must allow homeowners to build them if their lot meets minimum state and county requirements. Riverside County has specific development standards and zoning rules that must be followed, but in general, ADUs are permitted in both incorporated cities and unincorporated areas.
How much does it cost to build an ADU in Riverside County?
The cost to build an ADU in Riverside County varies based on location, size, design, and whether it’s detached, attached, or a garage conversion. On average, homeowners can expect to spend between $150,000 and $300,000. A garage conversion ADU may fall toward the lower end, while a new, detached unit with premium finishes will cost more. Honeywill Construction provides itemized, transparent estimates and helps homeowners explore ways to stay on budget without sacrificing quality.
How long does it take to build an ADU in Riverside County?
The full ADU process typically takes 4 to 8 months from initial design to move-in. This includes time for planning, permitting, site prep, construction, and inspections. The timeline may vary depending on city/county review processes, utility upgrades, and complexity of the build. At Honeywill Construction, we focus on clear communication and efficient project management to keep your build on schedule.
Do I need a permit to build an ADU in Riverside County?
Yes, permits are required for all ADU projects in Riverside County. This includes building, electrical, plumbing, mechanical, and potentially grading permits depending on the site. Whether you’re in a city like Murrieta or an unincorporated area, your ADU must be reviewed and approved by the local building department. Honeywill Construction handles the entire permitting process on your behalf, ensuring code compliance and peace of mind.
What size ADU can I build on my property in Riverside County?
In Riverside County, the size of your ADU depends on your property’s zoning, lot size, and whether the unit is attached or detached. California state law allows:
Detached ADUs: Up to 1,200 sq ft regardless of lot size.
Attached ADUs: Limited to 50% of the primary dwelling’s square footage, up to 1,200 sq ft.
Junior ADUs (JADUs): Up to 500 sq ft, created from interior space within the primary home.
Local ordinances may allow more flexibility in some zones.
Does my lot qualify for an ADU in Riverside County?
Most single-family and multifamily residential lots in Riverside County qualify for an ADU under current state law. However, zoning, setback requirements, and available infrastructure (such as sewer/septic and street access) must be considered. Honeywill Construction offers free consultations and site evaluations to help determine your lot’s eligibility and best options.
What’s the difference between a JADU and an ADU in California?
A JADU (Junior ADU) is a smaller, self-contained living space created within the footprint of an existing home (often converted from a bedroom or attached garage). JADUs are typically limited to 500 sq ft, must share utilities with the main house, and include a kitchenette. An ADU, on the other hand, can be detached or attached, includes a full kitchen and bath, and has its own utility connections. JADUs are easier to permit and cost less, but offer limited privacy and space.
Can I build an ADU on a property with a septic system?
Yes, you can build an ADU on a property with a septic system in Riverside County, but you’ll need to have your system evaluated and possibly upgraded to accommodate the additional usage. Approval from the Riverside County Department of Environmental Health is required. Honeywill Construction works with licensed engineers and septic professionals to handle this process.
What is the process for getting ADU plans approved in Riverside County?
The ADU approval process typically involves a site evaluation, architectural plans, engineering review, and submittal to the local building department. Depending on your jurisdiction, this may take 6 to 12 weeks. Plans must meet California Building Code, energy compliance (Title 24), and local zoning rules. Honeywill Construction manages the full approval process, from drawings and engineering to permit submission and revisions.
Are there any grants or incentives for building an ADU in California?
Yes! Homeowners in Yes, there are occasional statewide and local grant programs aimed at increasing affordable housing through ADUs. For example, the CalHFA ADU Grant Program has provided up to $40,000 in predevelopment and permitting assistance for eligible low- to moderate-income homeowners. Availability can change based on funding cycles. Honeywill Construction can help you explore current financing programs and incentives during your consultation.
Can I build a detached ADU in Murrieta, CA?
Yes, detached ADUs are allowed in Murrieta under California state law and local city ordinances. You can build up to 1,200 sq ft depending on your lot and zoning. Murrieta typically allows detached ADUs on most residential lots, provided you meet setback, height, and parking requirements. Honeywill Construction has experience working with Murrieta’s permitting process and can walk you through the design and approval for a detached unit.
What are the ADU zoning requirements in Temecula?
In Temecula, ADUs are allowed in most single-family residential zones, with specific requirements for maximum square footage, height limits (usually 16–18 feet), rear/side yard setbacks (typically 4 feet), and parking. Temecula also allows JADUs and supports garage conversions. Honeywill Construction ensures your design complies with Temecula’s zoning code while maximizing the use of your property.
Are ADUs allowed in historic districts like Idyllwild?
Yes, ADUs are allowed in Idyllwild, but historic districts may have design guidelines, material restrictions, or neighborhood review processes. Because Idyllwild is part of Riverside County’s unincorporated area, county-wide ADU rules apply, but some communities require compatibility with the surrounding architecture. Honeywill can help you design an ADU that respects the unique character of your neighborhood and passes review.
Can I convert my garage into an ADU in Palm Springs?
Yes, Palm Springs allows garage conversions into ADUs with minimal restrictions. California law prohibits cities from requiring replacement parking if the garage is converted into an ADU. You will still need to meet energy, fire, and building codes, and include an efficiency kitchen and private entrance. Honeywill Construction offers design-build garage ADUs that blend beautifully with Palm Springs’ modern architecture.
Is a junior ADU allowed in Riverside city limits?
Yes, the City of Riverside allows Junior ADUs (JADUs) in addition to standard ADUs. A JADU must be built within the walls of the existing home, be under 500 sq ft, and share a bathroom or utilities with the main dwelling. These units are ideal for caregivers, in-laws, or rental income on a tighter budget. We help design creative, code-compliant JADUs that use your interior space effectively.
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READY TO BUILD YOUR ADU?
LET’S CREATE A SPACE THAT WORKS FOR YOUR FUTURE.
Whether you’re planning a rental-ready unit, an in-law suite, or a custom detached ADU, Honeywill Construction is here to help. We proudly serve Murrieta, Temecula, Hemet, Menifee, and surrounding communities across Riverside County with full-service ADU design and construction. From your first consultation to final inspection, we deliver skilled craftsmanship, clear communication, and results tailored to your property, goals, and lifestyle.