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

Under the Fairfield Municipal Utility's connection-charge article, every new water hookup is assigned a capacity charge based on meter size and fixture demand. 060(C) singles out ADUs and JADUs for proportional treatment: the connection charge is scaled to the burden the unit adds, calculated on fixture units, rather than charged as a full new-dwelling fee. That proportional rule has two carve-outs. 31(b), the same as the primary house, because the parcel is starting from zero capacity. 070(B) exempts an ADU or JADU from the connection charge altogether if it is under 750 square feet or if it meets Government Code Section 66323(a)(1), which covers units built within an existing structure's envelope.

050 and adjusted every April 1 using the Engineering News-Record Construction Cost Index for the San Francisco area, so the dollar figure moves annually even though the ordinance text does not print it. 040. FMU's own compliance point is the connection-charge schedule, not a separate ADU permit process; the zoning and building review for the ADU itself runs through the Community Development Department under Chapter 25.