As cities across California search for practical ways to increase housing supply, Accessory Dwelling Units (ADUs) have emerged as a smart and sustainable solution. These small, independent living spaces offer flexibility for homeowners and create new opportunities for long-term housing within existing neighborhoods. From backyards to converted garages, ADUs are reshaping how communities approach urban living.
In Pomona, CA, the rising demand for affordable and accessible housing has made ADUs especially relevant. The city’s growing population and limited housing inventory have led residents and policymakers to embrace ADUs as a viable option. With its diverse residential zones and community-focused planning efforts, Pomona is well-positioned to benefit from this evolving trend.
Statewide support for ADUs has made the development process more accessible than ever. California’s ADU-friendly policies, including relaxed zoning restrictions and simplified permitting, have removed many traditional barriers. This guide explores everything homeowners and investors need to know, from local regulations and property types to the financial potential of building an ADU in Pomona.
What is an ADU?
An Accessory Dwelling Unit (ADU) is a compact, cost-effective housing structure located on the same residential plot. It can be attached to the main house or detached from the primary residence as a separate structure.
ADUs is a self-contained living space with a separate entrance, kitchen, bathroom, and bedroom. Also known as granny flats, in-law units, secondary units, casitas, accessory apartments, or backyard cottages, these are flexible housing solutions for multi-generational living, rental income, or additional personal space for homeowners.
ADUs are seen as a sustainable solution to urban housing shortages, especially in areas like Pomona, CA, where population growth is putting pressure on existing housing infrastructure. By allowing Accessory Dwelling Units (ADUs) in single-family and multi-family zones, California (CA) is encouraging densification without changing the neighborhood character.
In Pomona, these units offer practical solutions for homeowners to house aging relatives, generate rental income, or provide independent living space for adult children while complying with local zoning and building codes.
What Are The Types of ADUs?
The four primary types of ADUs include detached, attached, conversion, and Junior ADUs, each offering specific benefits and requirements. In California, the state encourages homeowners to explore diverse ADU options to address the housing shortage. The city of Pomona fully supports the initiative of affordable, modular, and customizable living spaces across qualifying residential zones to meet family and investment needs.
Detached ADUs
Often built as separate units in the open area, backyard, or side yard, detached ADUs are standalone structures from the main residence that offer the highest degree of privacy and independence. These structures are ideal for rental opportunities or multi-generational living.
In Pomona, detached ADUs can measure up to 1,200 square feet, with an 18-foot height limit (20 feet to accommodate a roof pitch), and 4-foot minimum setbacks from rear and side property lines. Homeowners must consider lot space, utility connection (water, sewer, electricity), and zoning compliance while planning a detached unit.
Attached ADUs
When homeowners prefer to expand the existing house without constructing a separate building, attached ADUs offer a seamless option. Sharing at least one wall with the main residence, attached ADUs function as an independent facility with a separate entrance, kitchen, living space, and bedroom.
As the attached unit gets the utilities from the existing home, they are cost-friendly options, proving a more affordable solution. These spaces are suitable for housing elderly relatives who require occasional assistance or short-term guest stays. However, these units should not be taller than the original home.
Conversion ADUs
Some homeowners opt to transform the existing space, such as a garage, attic, or basement, into a fully functional ADU, which is called a Conversion ADU. Since you are converting the already available structure into a separate living space, you need to make fewer new constructions. Also, homeowners can extend the already existing to garage conversion or basement apartment, which saves money, making this alternative a budget-friendly option.
However, the electrical, plumbing, and ventilation systems must be up to code. Likewise, you should assess the structural integrity and optimize natural light and ventilation while ensuring code-compliant renovations.
Junior ADUs (JADUs)
For homeowners looking for a small and affordable living space within their existing home, a JADU is a practical option. Junior Accessory Dwelling Units are created by reconfiguring interior space, often by converting a bedroom, within 500 square feet or less. They must have an efficient kitchen with small plug-in appliances and a separate entrance but can share a bathroom with the main house.
Since JADUs repurpose the existing space within the primary residence, homeowners minimize the cost of additional utility services or infrastructure. In Pomona, CA, JADUs are allowed to be built in single-family zones, especially when you do not need to build out.
What Are ADU Regulations for Pomona, CA Properties?
The City of Pomona follows California state laws for Accessory Dwelling Units (ADUs) and adds local requirements to address regional planning goals and neighborhood compatibility. These zoning and development standards balance the benefits of affordable housing and density with infrastructure and design. Homeowners need to know these local ADU rules to ensure their projects are compliant, efficient, and aligned with Pomona’s residential development standards.
Setbacks
ADUs in Pomona must meet minimum setbacks to maintain safe spaces and preserve neighborhood character. A 4-foot minimum setback is required from the side and rear property lines for utility placement and emergency access. These setbacks ensure the separation of structures and maintain the aesthetic and safety of residential neighborhoods.
Square Footage
The maximum size of an ADU in Pomona depends on the type and configuration of the unit. For residential lots with less than 7,200 square feet in area, ADUs, detached or attached, should not surpass 850 sq. feet for a studio or single unit. If you are building an ADU with two or more bedrooms, the floor area can measure up to 1,000 sq. feet.
Similarly, if the property area is more than 7,200 sq. feet, you are allowed to build an attached or detached ADU with a floor area of 1,200 sq. feet. If you are building a JADU. the coverage area should be within 500 sq. feet.
These limits align with California ADU laws while giving Pomona the flexibility to manage the urban density and building scale while maintaining proportionality and preventing overdevelopment.
Height
Height restriction in Pomona depends on the type of ADU.
- Detached ADUs: Cannot exceed 18 feet, and can be up to 20 feet to accommodate a roof pitch.
- Attached ADUs: Cannot surpass the height of the primary residence or 25 feet limit, whichever is lower.
Parking
According to the URGENCY ORDINANCE NO. 43533, homeowners do not need parking for bundling any ADU in Pomona. If parking is constructed, it must be on an approved surface and should follow these dimensions:
- Single parking: 9 feet by 18 feet
- Tandem parking: 9 feet by 33 feet
Minimum Lot Size
One of the most permissive features of Pomona’s ADU policy is ‘no minimum lot size’ to build an ADU. This is consistent with California’s state-wide ADU ordinance which wants to make compact housing options available to more property owners. As a result, even smaller parcels can add an ADU, without needing to assemble land or initiate a large-scale re-development.
Allowed locations
ADUs in Pomona are allowed in single-family and multi-family residential zones. This includes R-1 (Single Family Residential) and various multi-family zoning categories, allowing a wide range of property types to qualify. By allowing both types of housing, the City of Pomona is encouraging more accessory dwelling units in areas with mixed-use and varied population densities.
Renting the ADU
Pomona property owners can rent out ADUs, for a steady stream of rental income or affordable housing for tenants. But short-term rentals for less than 30 days are restricted by city ordinance. To be compliant, landlords must review local rules on rental duration, tenant screening, and registration requirements.
Duplex and Triplex
Multi-family properties like duplexes and triplexes can add multiple ADUs under Pomona’s ADU ordinance. California law allows up to two detached ADUs on multi-family lots, plus conversion ADUs from unused interior space. These additions must meet building codes, setback standards, and site availability. This makes ADUs a great investment for multi-unit property owners looking to increase density and long-term income.
What Is the Permitting Process for ADUs in Pomona, CA?
The permitting process for Accessory Dwelling Units (ADUs) in Pomona, CA follows a structured pathway that adheres to state-mandated ADU laws and local development standards. Whether constructing a detached, attached, conversion, or Junior ADU, homeowners in Pomona must complete a series of approvals to ensure zoning, safety, and building standards.
Below is a step-by-step breakdown of the ADU permitting process in Pomona, CA:
Step 1: Confirm Property Eligibility
- Review the Zoning and Development Code (Section 830.A) on the City of Pomona website.
- Confirm your zoning designation, property size, and type (single-family or multi-family).
- Ensure that your lot allows for the required setbacks, height limits, and unit size.
Step 2: Conduct a Site Assessment
- Check available space for new construction or conversion.
- Identify potential locations for utility connections (water, sewer, electrical).
- Consider accessibility, fire clearance, and parking requirements (if applicable).
Step 3: Prepare Architectural Plans
Hire a licensed architect or designer to develop a complete set of ADU construction plans, including site layout, floor plans, elevations, and energy compliance documents. Your architectural plan should include:
- Site plan with dimensions, setbacks, and ADU placement
- Floor plan with layout of rooms, kitchen, bath, and entrances
- Building elevations showing height and structure design
- Utility plans (sewer, water, electrical)
- Title 24 energy compliance documentation
Step 4: Submit Plans for Verification
File your application with the Pomona Building and Safety Division for a full plan check review. It should contain:
- Completed ADU application form
- All architectural and structural plans
- Supporting documentation and calculations
- Proof of property ownership
- Any other forms required by the city
Step 5: Obtain Zoning and Building Approvals
The City of Pomona will review the plans for zoning compliance, building code adherence, and utility access. It will pass through:
- Planning Department: Verifies compliance with zoning laws and ADU regulations
- Building & Safety Division: Reviews plans for code compliance and construction safety
- Public Works/Utilities: Assesses impacts on infrastructure and services
Step 6: Pay Permit Fees and Secure Permits
Once your plans are approved, you must pay these fees:
- Permit fees, which may vary depending on ADU size and scope
- Building, electrical, plumbing, and mechanical permits
Once all fees are paid, you will receive your official construction permits.
Step 7: Begin Construction
Once you get the permit, you can begin the construction under the supervision of a licensed contractor. The construction must follow the approved plan. The progress of the ADU will be monitored by the city at various stages, including foundation, framing, and electrical.
Step 8: Final Inspection and Certificate of Occupancy
After the construction is complete, the city of Pomona will schedule a final inspection to ensure building and zoning standard compliance. Upon passing all inspections, the city will issue a Certificate of Occupancy, allowing you to legally inhabit or rent the ADU.
What Is the Investment Potential of ADUs in Pomona?
As a flexible, self-contained living space built on residential properties, ADUs in Pomona, California, eases the affordable housing shortage and strong investment potential for homeowners. California’s ADU-friendly policies and Pomona’s local support encourage homeowners to choose this cost-effective, versatile, and income-generating opportunity.
Below are the key 5 reasons that inspire property owners to consider investment in ADUs in Pomona:
- High Demand for Affordable Housing
Pomona is facing a well-known shortage of affordable housing in both rental and ownership markets. 45% of Pomona residents are renter-occupied and pay $2,293 for an apartment. To address the housing crisis the City of Pomona is launching initiatives to encourage ADU development such as aligning local ordinances with state mandates and applying for the State’s Pro Housing designation. ADUs are the solution to this crisis, providing cost-effective rental options within existing neighborhoods making them attractive to tenants and a smart investment for homeowners.
- Strong Rental Income Opportunity
According to Zillow, Pomona’s rental market is growing and the median rent is around $1,927/month (2 beds) as of 2025. This is driven by students from nearby colleges, workers from surrounding employment centers, and families looking for affordable housing in LA County. ADUs with 1-2 beds can rent for close to the city’s median, depending on size and amenities. With construction costs paid off in a few years of renting, homeowners can make positive ROI over the long haul and increase the value of their land.
- Property Value Increase
In Pomona, ADUs and rental potential attract buyers and investors, helping fetch a significantly higher value. According to real estate pros and home appraisal studies, an ADU can add anywhere from 20 to 30% to a home’s value, depending on the location and the design of the ADU. Buyers see those extra units as a more versatile chance to generate income, making properties with ADUs highly sought after in competitive markets like Pomona. As a result, those homes sell faster and for higher prices, providing homeowners with a direct return on investment.
- Flexibility for Future Use
One of the things that draws people to ADUs is their long-term flexibility. That flexibility allows you to house aging parents, provide living space for adult children, or offer private guest accommodations. Some homeowners even turn them into home offices or studios. As their needs or the market changes, owners can adapt quickly and move into the ADU and rent out the main house for extra income. That strategy supports aging in place, with lower maintenance costs and a steady stream of rental income. Such adaptability makes ADUs a smart, future-proof investment that can align with changing personal needs and market demands.
- Favorable State & Local Regulations
California has made it easier than ever to build ADUs by removing parking requirements, loosening zoning restrictions, and shortening review times. Pomona has followed suit, streamlined the permitting process, and brought local codes in line with state law.
Homeowners can access resources, application guides, and city assistance to help them through the process. Financial incentives sweeten the deal, with CalHFA’s ADU Grant offering up to $40,000 for pre-development costs, and local loans and fee reductions make it even more affordable. These pro-ADU policies make it easier and cheaper for homeowners to cash in on this opportunity.
How Professional Property Management Services Enhance ADU Investments in Pomona?
Managing an Accessory Dwelling Unit (ADU) in Pomona requires time, knowledge, and attention to detail. Pomona property management companies help by handling tenant screening, and lease agreements, and ensuring compliance with local rental laws. They also oversee maintenance and repairs, which helps protect your investment and maintain tenant satisfaction.
For Pomona homeowners seeking a seamless experience, Skybridge Property Group offers tailored management solutions for ADU investments. From rent collection and financial reporting to vacancy marketing and budgeting for expenses, Skybridge ensures every aspect of your ADU is professionally managed. With deep knowledge of Pomona’s rental market and regulatory landscape, Skybridge helps property owners turn ADUs into sustainable, income-generating assets with minimal stress.
