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Oakland, CA Accessory Structures: ADU Impact Fees (2026)

Few Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Exempt category
ADUs per Planning Code § 17.09.040
Governing chapter
OMC Chapter 15.72, Affordable Housing Impact Fee
Fee formula for non-exempt projects
Fee per sq ft × Additional Residential Sq Ft
Fee adjusted
Annually each July 1st for cost inflation
Most recent amending ordinance
Ord. No. 13853, adopted 7-15-2025

Summary

Oakland exempts Accessory Dwelling Units from its Affordable Housing Impact Fee entirely. Municipal Code § 15.72.040(C)(1) lists ADUs, as defined in Planning Code § 17.09.040, among the project types excused from paying the citywide per-square-foot development fee.

C. Exemptions Based on Project Type. The following shall be exempt from this Chapter: 1. Accessory Dwelling Units or ADUs, as defined in Section 17.09.040 of the Oakland Planning Code; 2. Vehicular Residential Facilities, as defined in Section 17.10.700 of the Oakland Planning Code; 3. Affordable Housing units and Affordable Housing Projects; 4. Missing Middle housing...

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 102 | Planning Code: Supplement 59).

Full Breakdown

050(B). 040(C) carves out six categories of projects that owe nothing under the chapter, and the first listed is Accessory Dwelling Units: '1. 41). 080, which is reserved for applicants contesting fees that do apply to their project. The exemption traces to Ordinance No. 13365 (adopted May 3, 2016), which created the chapter, and has carried forward through the most recent amendment, Ordinance No. 13853 (July 15, 2025). 040(C)(1) attaches to the ADU as a Development Project type, not to the parcel as a whole.

Violations & Fines

Because ADUs are simply outside Chapter 15.72's fee obligation, there is no fine or penalty tied to this exemption itself. Enforcement under § 15.72.090 targets non-exempt projects that fail to pay: the City may withhold building-related permits, record a special assessment lien against the property, revoke or suspend the certificate of occupancy, and assess daily civil penalties under Chapter 1.08 that continue accruing until the fee and interest are paid. An applicant who wrongly claims the ADU exemption for non-ADU square footage risks reassessment and the same lien and civil-penalty exposure as any other unpaid impact fee.

Frequently Asked Questions

Does Oakland charge an impact fee to build an ADU?
No. OMC § 15.72.040(C)(1) exempts Accessory Dwelling Units, as defined in Planning Code § 17.09.040, from the citywide Affordable Housing Impact Fee that applies to most other new residential square footage in Oakland.
Does the ADU exemption cover the whole property if I also add other units?
No. The exemption in § 15.72.040(C)(1) applies to the ADU's square footage specifically. Additional non-ADU units built on the same parcel, such as a duplex or added bedroom, remain subject to the impact fee calculation in § 15.72.050 unless another listed exemption applies.
What happens if a non-exempt project doesn't pay the fee?
Under § 15.72.090, the City can withhold building permits, record a lien against the property, revoke the certificate of occupancy, and impose daily civil penalties under Chapter 1.08 until the fee and accrued interest are paid in full.
When did Oakland's impact fee exemption for ADUs take effect?
Chapter 15.72 was created by Ordinance No. 13365, adopted May 3, 2016, with the ADU exemption included in the project-type exemptions of § 15.72.040(C); the chapter has since been amended, most recently by Ordinance No. 13853 on July 15, 2025.

Sources & Official References

Other rules in Oakland

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ADU Impact Fees in Nearby Cities

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