ADU Contractors near Riverside, CA
Avorino
360 E 1st St #355, Tustin, CA 92780
27.8 miles
Avorino specializes in ADU construction, offering detached, attached, garage conversion, and above-garage units. Projects range from $250K–$400K, covering design, permitting, and build phases over 10–14 months.
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USModular Inc.
579 West County Line Road, Calimesa, CA 92320
18.8 miles
USModular Inc. is a Temecula, CA ADU builder specializing in modular, prefabricated construction. Units are up to 90% factory-built, completed in ~120 days, and comply with IRC and local codes. Services include feasibility studies, design, enginee... read more
Fassino Development
4275 Linda Vista Drive, Fallbrook, CA 92028
44.4 miles
California ADUs are self-contained units on single-family lots, offering rental income, family housing, and no land purchase. Build up to 1,200 sq ft. Fassino Development guides homeowners through ADU construction, ensuring local code compliance.<... read more
Calpacific Constracting
24024 Outrigger Drive, Canyon Lake, CA 92587
19.4 miles
Calpacific Contracting builds ADUs, casitas & garage conversions across Riverside, Orange, LA & San Bernardino Counties. 80+ years experience. Full-service: permits, design, construction & inspections handled end-to-end.
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Lifescape Builders Inc
42550 De Portola Road, Temecula, CA 92592
35.9 miles
Lifescape Builders Inc provides ADU construction services in Temecula and Riverside County, including detached ADUs, granny flats, in-law suites, casitas, garage conversions, and JADUs, with customizable layouts, finishes, and full custom build op... read more
Rost Architects
8855 Research Drive, Irvine, CA 92618
28.3 miles
Plan your ADU project with expert guidance. Rost Architects covers key factors like setbacks, height limits, floor area, utilities, and local guidelines to help homeowners avoid costly mistakes and build compliant, well-designed accessory dwelling... read more
LA ADU Solutions Inc.
Los Angeles, CA 90012
49.2 miles
Accessory Dwelling Units (ADUs) offer California property owners passive income, elderly care solutions, and property value growth. Since 2020 legislation, ADU permits are easier to obtain. Construction costs range $350–$450/sq ft, with rental i... read more
Vertebrae
725 South Los Angeles Street, Los Angeles, CA 90014
49.6 miles
Vertebrae is an LA-based, woman-owned architecture studio founded in 2012, specializing in ADU design and small-space living. Award-winning projects include the 2025 Architizer A+ Award and 2023 AIA LA Honor Award winners.
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Bergstrom Construction Inc.
10232 I Avenue, Hesperia, CA 92345
34.8 miles
Bergstrom Construction Inc. builds custom ADUs in Apple Valley, Victorville & Hesperia. Serving San Bernardino County, they offer in-law suites, backyard cottages, home offices & garage additions tailored to High Desert homeowners.
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Blue Dog Construction
4199 Flat Rock Road, Riverside, CA 92505
6.1 miles
Kol & Co
23431 Blue Bird Dr, Lake Forest, CA 92630
28.4 miles
Kol & Co. is an ADU contractor serving Orange County, West LA & North San Diego. With 15+ years in design-build, they handle detached ADUs, garage conversions, JADUs & more—managing permits, design, and construction under one roof.read more
Fontana General Contractors
14189 Foothill Boulevard, Fontana, CA 92335
13 miles
Fontana General Contractors builds custom ADUs, including detached units, garage conversions, and in-law suites. They handle permits, zoning, and full construction management, helping property owners add value and flexible living space.
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New Era Home Services
Long Beach, CA 90815
43.1 miles
New Era Home Services LLC is a full-service ADU builder specializing in custom accessory dwelling units, including granny flats, rental units, and garage conversions, guiding homeowners through design, permitting, and construction.
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A2Z ADUs
3610 Central Avenue, Riverside, CA 92506
1.1 miles
A2Z ADUs, a Riverside, CA-based ADU contractor, builds detached and attached accessory dwelling units, in-law suites, and granny flats, managing design, permitting, and zoning compliance for homeowners seeking rental, guest, or family living space... read more
ORR Construction
1977 Obispo Avenue, Signal Hill, CA 90755
44.8 miles
ADUs are secondary units built on existing lots. ORR Construction builds detached ADUs, garage conversions, JADUs & in-law suites in California. Costs range $50–$300/sq ft. California laws like SB 897 simplify the permitting process.
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Other cities in California
What you need to know
ADU Contractors in Riverside, CA: Building in the Inland Empire's Largest City
Riverside, California, the seat of Riverside County and one of the largest cities in the Inland Empire, has seen a significant surge in Accessory Dwelling Unit (ADU) construction in recent years. As housing demand continues to grow in Southern California, Riverside homeowners are increasingly turning to experienced ADU contractors to maximize their property's potential. With its mix of historic neighborhoods, spacious lots, and a relatively lower cost of living compared to coastal cities, Riverside presents unique opportunities for ADU development.
Riverside ADU Regulations and Permitting Requirements
Before breaking ground, ADU contractors in Riverside must navigate the city's specific zoning and building codes. Riverside follows California's statewide ADU laws while also enforcing local ordinances. Key regulations include:
- Maximum ADU size: Detached ADUs can be up to 1,200 square feet, while attached ADUs are limited to 50% of the primary dwelling's square footage.
- Setback requirements: A minimum 4-foot rear and side yard setback is required for most ADU types.
- Height limits: Detached ADUs are generally limited to 16 feet in height, though this can vary by zone.
- Owner-occupancy: As of 2020, California state law removed owner-occupancy requirements, giving Riverside homeowners more flexibility.
- Parking: In many cases, no additional parking is required for ADUs located near public transit or within certain zones.
Types of ADUs Built by Riverside Contractors
Experienced ADU builders in Riverside are well-versed in constructing a variety of unit types to suit different property configurations and homeowner goals. Common ADU types in Riverside include:
- Detached ADUs: Standalone structures built in the backyard, ideal for Riverside's larger residential lots.
- Attached ADUs: Units added directly to the existing home, sharing at least one wall.
- Garage Conversions: Converting existing garages into livable space, a popular and cost-effective option.
- Junior ADUs (JADUs): Units up to 500 square feet created within the existing home's footprint.
Why Hire a Local ADU Contractor in Riverside?
Hiring a local ADU contractor in Riverside, CA offers distinct advantages. Local professionals are familiar with the City of Riverside's Building and Safety Division permitting process, which helps streamline approvals and avoid costly delays. They also understand the region's climate considerations, including the hot summers typical of the Inland Empire, ensuring proper insulation and energy-efficient design that meets California's Title 24 energy standards.
Costs and Investment Value of ADUs in Riverside
The cost of building an ADU in Riverside typically ranges from $100,000 to $300,000 depending on size, type, and finishes. Given Riverside's growing rental market and proximity to UC Riverside and major employment centers, a well-built ADU can generate significant rental income, making it a smart long-term investment for homeowners throughout the city.