Window Replacement Contractor Software in California

California writes its own energy code, Title 24, and the window number is 0.30. Every new window in every climate zone has to carry a U-factor of 0.30 or lower. In most of the state, climate zones 2, 4, and 6 through 15, which take in the Central Valley, Los Angeles, San Diego, and the Inland Empire, the solar heat gain coefficient has to be 0.23 or lower as well. That second number is the California sale. The heat is the bill, from Fresno to Riverside, and a window that keeps the sun out in August is the one that sells. On the coast the numbers are softer and the wind is the story.

The houses are the market. The median California house dates from 1976, and the original aluminum sliders on the tract houses of the 1960s, 1970s, and 1980s are the replacement job in the San Fernando Valley, Orange County, Sacramento, and the East Bay. They leak air, they sweat, and they let the sun through. Fewer than one in ten houses date from before 1940, and those are the wood windows in San Francisco, Pasadena, and the old neighborhoods of Los Angeles. Fire has added a spec. In a fire hazard severity zone the window is part of the fire code too, and after the Palisades and Eaton fires of January 7, 2025 destroyed 16,246 structures, the rebuild in Altadena and the Palisades is written to that code, which since January 1, 2026 lives in the state's Wildland-Urban Interface Code.

A window company is licensed by the Contractors State License Board, with a $25,000 bond, and since January 1, 2025 anything over $1,000 needs the license. The contract carries a down payment of no more than $1,000 or 10 percent, whichever is less, in 12-point bold, and no payment for work not done or windows not delivered. The homeowner has three business days to cancel, five at 65 or older, and seven after a declared disaster. Custom windows run four to eight weeks from order to delivery, and the law's rule on payment for materials not yet delivered shapes the schedule. Installs run all year.

The state lost about 54,000 people in the year to January 1, 2026 and still added 115,165 homes, in Mountain House, Lathrop, Menifee, Roseville, and Irvine. Every new house since January 1, 2020 carries solar by law, so the energy conversation is one the homeowner already knows, and a window company that can talk about the U-factor and the solar heat gain number in plain words wins it.