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

060 tracks the state formula in Government Code Section 66000 et seq. Any ADU under 750 square feet is completely exempt from development impact fees, the fees cities normally charge new residential construction for parks, roads, police, and similar facilities. An ADU of 750 square feet or larger still owes impact fees, but they cannot be charged at the full new-dwelling rate; instead the code requires them to be proportional in relation to the square footage of the primary dwelling unit, meaning the ADU's fee is scaled down based on how its floor area compares to the primary home rather than assessed as if it were a second, independent house.

060(A) allows an ADU or JADU to draw off the primary dwelling's existing water and sewer connections rather than requiring a new, separate service line, but the owner still owes all sewer, water and other applicable fees for that connection. 060(C) requires the owner to submit letters of service availability, essentially a will-serve confirmation, from the water and sewer provider, or, if using a private septic system, documentation of approval by the local health officer. These letters confirm the utility can actually serve the additional unit before the city commits to the permit.