Building Your Dream ADU in Pomona
Your premier resource for ADU services, plans, permitting, design, and construction in Pomona, California.
Our ADU Services in Pomona
Comprehensive solutions for your Accessory Dwelling Unit needs
ADU Design
Custom architectural designs tailored to your property and needs. Our expert designers create beautiful, functional spaces that maximize utility.
Permitting
Navigate Pomona's permitting process effortlessly with our expertise. We handle all paperwork and city interactions to ensure smooth approval.
Construction
Quality construction services from foundation to finish. Our experienced builders ensure your ADU is built to last with attention to every detail.
Project Management
End-to-end project management ensuring your ADU is completed on time and within budget. We coordinate all aspects of your project.
Financing Assistance
Get help navigating financing options for your ADU project. We connect you with lenders experienced in ADU financing in Pomona.
Interior Design
Transform your ADU into a beautiful living space with our interior design services. From fixtures to finishes, we help with every selection.
ADU Types Available in Pomona
Explore the different types of Accessory Dwelling Units
Detached ADUs
Standalone structures separate from the main residence. Perfect for maximizing privacy and creating a truly independent living space.
- Complete privacy from main house
- Flexible positioning on your property
- Various size options available
- Custom designs to match your style
Attached ADUs
Extensions connected to the existing home. An economical option that utilizes existing walls and foundation while expanding your living space.
- Cost-effective construction
- Shares utilities with main house
- Maximizes available lot space
- Seamless integration with existing home
Conversion ADUs
Transform existing spaces like garages, basements, or sheds into functional living areas. The most affordable option for creating an ADU.
- Most affordable ADU option
- Repurposes underutilized space
- Faster completion timeframe
- Minimal disruption to property
Junior ADUs (JADUs)
Smaller units (max 500 sq ft) created within the walls of the main residence. A compact and affordable housing solution.
- Small footprint (up to 500 sq ft)
- Can share bathroom with main house
- Requires efficiency kitchen
- Lower permitting and construction costs
ADU Project Gallery
View our completed ADU projects in Pomona and surrounding areas

Modern Kitchen Design
Detached ADU in Pomona

Contemporary Bathroom
Garage Conversion ADU

Minimalist Bedroom
Attached ADU Project

Modern Exterior Design
Detached ADU in Pomona

Spacious Living Room
Junior ADU Design

Open Floor Plan
Conversion ADU Project
Pomona ADU Requirements
Essential information about building an ADU in Pomona, California
Permitting Process
Building an ADU in Pomona requires proper permits and approvals. Here's what you need to know:
- Plan Check Fee: Approximately $2,562 for a 749 sq ft ADU
- Permit Fee: Approximately $3,148 for a 749 sq ft ADU
- No Development Impact fees for ADUs under 750 sq ft
- Development Impact fees of approximately $18,711 for larger ADUs (1200 sq ft)
- Plan check and permits are based on valuation of the project
*Actual costs will vary based on valuation, fixture count, and square footage
ADU Definitions & Types
According to Pomona regulations, an Accessory Dwelling Unit (ADU) is a distinct, self-contained living space situated on the same property as a primary residence. ADUs include:
- Living and sleeping areas
- A kitchen
- A bathroom
ADUs can be categorized into several types:
- Detached ADUs: Standalone structures separate from the main residence
- Attached ADUs: Extensions connected to the existing home
- Conversion ADUs: Created by repurposing existing spaces
- Junior ADUs (JADUs): Smaller units (max 500 sq ft) within the main residence
Junior ADU (JADU) Requirements
A Junior Accessory Dwelling Unit (JADU) is a more compact version of an ADU, typically developed within the existing footprint of a single-family home:
- Must be contained within an existing single-family residence
- May share a bathroom with the primary dwelling
- Requires an efficiency kitchen (sink, cooking appliance, food preparation counter, and storage cabinets)
- Maximum size of 500 square feet
Unpermitted ADU Legalization
For any unpermitted ADU or JADU constructed before January 1, 2020, the following applies per AB 2533 (effective January 1, 2025):
- Local agencies cannot deny a permit for an ADU/JADU that violates building codes or local ordinances
- Property owners are not required to pay impact fees or connection/capacity charges except where utility infrastructure is required for health and safety compliance
- Local agencies cannot penalize applicants for having unpermitted units
- Inspectors may examine units for compliance with Health and Safety standards and provide recommendations
Our Simple ADU Process
From concept to completion in 4 straightforward steps
Consultation & Design
We begin with a free consultation to understand your needs and assess your property. Our design team then creates custom plans tailored to your specifications and budget.
Permitting
Our team handles all the paperwork and coordination with the City of Pomona to secure the necessary permits and approvals for your ADU project.
Construction
Our experienced construction team builds your ADU with quality materials and craftsmanship. We maintain regular communication throughout the build process.
Final Inspection & Handover
After construction is complete, we coordinate final inspections and ensure everything meets code requirements before handing over your new ADU.
Frequently Asked Questions
Everything you need to know about Accessory Dwelling Units in Pomona
General ADU Questions
ADU Permitting & Regulations
Design & Construction
ADU Financing & Costs
Zoning & Property Considerations
Miscellaneous ADU Questions
Contact Us
Get in touch to discuss your ADU project in Pomona
Phone
Location
Pomona, California
Frequently Asked Questions
Everything you need to know about ADUs in Pomona
General ADU Questions
An Accessory Dwelling Unit (ADU) is a self-contained residential unit located on the same property as a primary residence. It can be detached (separate building), attached (addition to your home), or converted from existing space. ADUs include all basic amenities: kitchen, bathroom, and living space.
A Junior Accessory Dwelling Unit (JADU) is a smaller unit of up to 500 square feet created within the existing walls of a single-family residence. Unlike a full ADU, a JADU can share a bathroom with the main house and requires an efficiency kitchen rather than a full kitchen. JADUs are typically more affordable to build than full ADUs.
Building an ADU in Pomona offers numerous benefits including: creating additional rental income, providing housing for family members, increasing property value, contributing to housing solutions in California, and potentially benefiting from tax incentives and favorable ADU regulations.
Pomona ADU Requirements
In Pomona, detached ADUs can be up to 1,200 square feet. Attached ADUs can be up to 50% of the existing primary dwelling's floor area, with a maximum of 1,200 square feet. Junior ADUs (JADUs) are limited to 500 square feet and must be built within the walls of the main house.
Under California law, most single-family and multi-family residential properties in Pomona qualify for ADU construction. However, specific zoning regulations, property size, and existing structures may affect your eligibility or the type of ADU you can build. A consultation with our experts can help determine what's possible for your specific property.
ADU Costs & Financing
The cost of building an ADU in Pomona varies widely depending on factors such as size, type, and finishes. As a general guideline:
- Conversion ADUs (garage, basement): $100,000 - $200,000
- Attached ADUs: $200,000 - $350,000
- Detached ADUs: $250,000 - $450,000+
- Junior ADUs: $50,000 - $150,000
Get an instant ADU quote specific to your property by using our online tool.
Permitting fees in Pomona for ADUs include:
- Plan Check Fee: Approximately $2,562 for a 749 sq ft ADU (based on valuation of $125,360)
- Permit Fee: Approximately $3,148 for a 749 sq ft ADU
- Development Impact Fees: $0 for ADUs under 750 sq ft, approximately $18,711 for larger ADUs (1200 sq ft)
Actual costs will vary based on the specific details of your project including valuation, fixture count, and square footage.
Several financing options are available for ADU construction in Pomona:
- Cash-out refinance of your primary mortgage
- Home equity line of credit (HELOC)
- Home equity loan
- Construction loans
- Renovation loans (such as FHA 203k)
- ADU-specific financing programs
- California's CalHFA ADU Grant Program (for qualifying homeowners)
We can help connect you with lenders experienced in ADU financing during your consultation.
The ADU Building Process
The timeline for an ADU project in Pomona typically ranges from 9-15 months from start to finish:
- Design and planning: 1-2 months
- Permitting process: 2-4 months
- Construction: 4-8 months
- Final inspections and occupancy: 1 month
Conversion ADUs and JADUs typically have shorter timelines, while new construction detached ADUs generally take longer. Our team works efficiently to minimize delays at every stage of the process.
For unpermitted ADUs constructed before January 1, 2020, Pomona follows California's AB 2533 rules (effective January 1, 2025):
- Local agencies cannot deny permits for ADUs that violate building codes or local ordinances
- Property owners are exempt from impact fees or connection charges except when utility infrastructure is needed for health and safety compliance
- Inspectors may inspect the unit for health and safety standards compliance and provide recommendations
- The process generally involves submitting "as-built" plans, getting inspections, making necessary health and safety upgrades, and obtaining a Certificate of Occupancy
Our team specializes in ADU legalization and can guide you through this process efficiently.
Ready to Start Your ADU Project in Pomona?
Whether you're looking to create additional income, house family members, or increase your property value, we're here to help you navigate the entire ADU process.