ADU Builder in Pomona, CA: Permits, Costs and Local Rules

What are the ADU rules in Pomona?

Pomona's ADU page and Plan Check Guide are the local application and review documents; Pomona's current ADU ordinance is the city's local rule that adds the application steps on top of the California state floor. The state floor is the most important number for any Pomona ADU. Under Gov. Code 66321, a city cannot set a maximum ADU size below 850 sq ft for a studio or one-bedroom, or below 1,000 sq ft for an ADU with more than one bedroom, and cannot require rear or side setbacks greater than four feet for a new construction ADU. Under Gov. Code 66314(d), a city cannot require parking for an ADU within a half mile of a major transit stop or a high quality transit corridor, and ADUs that are converted from existing structures (garages, carports, covered or uncovered parking) are exempt from the replacement parking requirement. The detached ADU ceiling under Gov. Code 66314(d)(5) is 1,200 sq ft. A JADU in Pomona is capped at 500 sq ft of interior livable space under the local ADU ordinance.

How long does Pomona have to approve an ADU permit?

Under Gov. Code 66317, a permitting agency must approve or deny a completed ADU application within 60 days of receiving it. If the deadline passes, the application is deemed approved. Pomona runs a complete site-specific plan check through its Building and Safety Division; the Pomona ADU Plan Check Guide is the local document that lists submittal conditions. A separate address assignment from Pomona Public Works is required before plan check submittal because the United States Postal Service and the local utilities will not set an additional meter for an existing billing address. L Square prepares the full submittal package and tracks the 60-day clock for the homeowner.

What fees does a Pomona ADU pay?

Pomona publishes a reference ADU fee table on its ADU page, with amounts that vary by valuation, fixture count, and square footage; the live numbers are the Master Fee Schedule and the Impact Fee Schedule, both linked from the Pomona ADU page. Under Senate Bill 13, ADUs of 750 sq ft or less are exempt from city development impact fees, and any impact fee on an ADU over 750 sq ft is charged proportionally to the primary dwelling. The Pomona ADU page shows the state-mandated zero development impact line for ADUs at the small square-footage tier and a proportional impact fee for larger ADUs; impact fee categories on the city's published Impact Fee Schedule include park in-fill, sewer, water, public safety, road, and traffic signal. L Square collects the city fee amounts and a site-specific impact fee estimate before submitting plans.

How much does an ADU cost in Pomona?

L Square publishes configured model prices on the cost guide page: $180,000 for Model 600, $240,000 for Models 800A and 800B, $295,000 for Models 1000A and 1000B, and $354,000 for Model 1200. These are model prices, not a final total for your lot. Pomona lots often carry older water and sewer laterals, the city's separate address and meter setup, Southern California Edison load calculation or subpanel work, separate Southern California Gas service, and the published Pomona development impact fee on ADUs over 750 sq ft, all priced after a site review. Garage conversions, attached ADUs, and JADUs are priced from a property specific scope because each one depends on the existing structure and the lot layout.

What should you confirm before building in Pomona?

Check three things before drawings are final. First, ask the Pomona Planning Division whether your lot is in a Historic District, because a Major Certificate of Appropriateness from the Historic Preservation Commission may be required. Second, confirm whether the ADU can meet Pomona's published development standards for setbacks, building height, lot coverage, and unit size, because the Pomona ADU Plan Check Guide states that an ADU that does not meet the standards will require a Conditional Use Permit approved by the Planning Commission. Third, confirm the state's preemptive standards for ADUs and JADUs, because a local agency cannot deny a permit that meets state law under Gov. Code 66325, and any unpermitted ADU may qualify for the state's legalization pathway under the Health and Safety Code.

Official Pomona ADU sources

• Pomona's ADU page and Plan Check Guide are the local application and review documents; the Plan Check Guide requires a separate address assignment from Pomona Public Works before plan check submittal. Official source
• Pomona's ADU Plan Check Guide requires a separate address assignment from Pomona Public Works before plan check submittal, and lists the submittal conditions on the Building Application and Forms portal. Official source
• A permitting agency must approve or deny a completed ADU application within 60 days, and the application is deemed approved if the deadline is missed. Official source
• A local agency cannot set a maximum ADU size below 850 sq ft (1,000 sq ft for more than one bedroom), and cannot require rear or side setbacks greater than four feet for a new construction ADU. Official source
• A local agency cannot require parking for an ADU within a half mile of a major transit stop or high quality transit corridor; replacement parking is not required for ADUs converted from an existing structure. Official source
• California Government Code Section 66325 states that a local ordinance or other provision of law is preempted by this chapter if it conflicts with this chapter, including approval, permitting, and impact fee rules for ADUs and JADUs. Official source
• California Government Code Section 66311.5(c)(1) states that a local agency, special district, or water corporation shall not impose any impact fee upon an accessory dwelling unit of 750 square feet of interior livable space or less, or upon a Junior ADU of 500 square feet of interior livable space or less, and any impact fees on a larger ADU shall be charged proportionately to the primary dwelling square footage. Official source