10/17/2026
California just made it cheaper to build an ADU, effective January 1, 2027.
SB 1117 is now law, and it wipes out one of the sneakiest ADU costs. Before, a homeowner building a 900 sq ft ADU could owe impact fees on all 900 feet once they crossed 750. Starting January 1, 2027, the city can only charge on the footage above 750, for the first two ADUs on the lot. Lawmakers say that 'fee cliff' was costing homeowners $12,000 to $28,000 and killing projects. If an ADU has been on your wish list, the math gets friendlier in 2027, and the financing question is the same one it always was: a renovation loan sized on the home's after-renovation value, or a HELOC on what the home is worth today. Worth running both numbers before you pick.