Upland, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- Under 750 sq ft
- No impact fee
- 750 sq ft or larger
- Fee prorated by floor area
- Impact fee scope
- Mitigation Fee Act and Quimby Act fees only
- Water/sewer charges
- Billed separately, § 17.37.070(B)
- Governing section
- § 17.37.070(A)
Summary
Upland waives impact fees entirely for any ADU under 750 square feet. Larger ADUs owe a fee prorated by floor area against the primary dwelling, and the fee excludes water and sewer connection charges, which are billed separately.
No impact fee is required for an ADU that is less than 750 square feet in size. Any impact fee that is required for an ADU that is 750 square feet or larger in size must be charged proportionately in relation to the square footage of the primary dwelling unit (e.g., the floor area of the ADU, divided by the floor area of the primary dwelling, times the typical fee amount charged for a new dwelling).
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4480959; v4 updated 2025-09-22).
Full Breakdown
040B. The rule has a hard size threshold: an ADU under 750 square feet pays zero impact fee. Once an ADU reaches 750 square feet or larger, the city cannot charge a flat new-dwelling fee; instead the fee must be prorated by floor area, calculated by dividing the ADU's square footage by the primary dwelling's square footage and multiplying that ratio by the standard fee charged for a new dwelling unit. 3 defines 'impact fee' narrowly for this purpose as a fee under the Mitigation Fee Act (Government Code § 66000(b)) or a fee under the Quimby Act (Government Code § 66477), and expressly excludes any water or sewer connection fee or capacity charge from that definition. 070(B)(3)(b).
Violations & Fines
There is no separate penalty schedule for impact fees; they are collected as a condition of building permit issuance. If Development Services miscalculates or an applicant disputes the proportional fee under § 17.37.070(A)(2), the recourse is an administrative appeal through the city's standard building-permit fee process rather than a code-enforcement citation, since the fee is a precondition to permit issuance, not a standalone violation.
Frequently Asked Questions
Does my Upland ADU owe any impact fees?
How is the impact fee calculated for a larger ADU?
Are water and sewer hookup charges included in the impact fee?
Sources & Official References
Other rules in Upland
California rules heatmap·Compare Upland to another location·View the California accessory structures overview
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ADU Impact Fees in Nearby Cities
How other cities in San Bernardino County handle adu impact fees.