Three season sunrooms in Oak Hills CA - a sheltered room for the nicer months

Building a sunroom in Southern California usually costs about $110 to $200 per square foot, and that's the going rate across the region, not our quote. A three season room tends to land lower when it's small, sits on an existing slab, uses lighter windows or screens and ties into a roof structure that's already there, while a bigger room that needs a new foundation sits toward the top. I'll price your room once I've measured and checked the base.

No, a three season room isn't meant to be lived in, because it has no heating or cooling and its windows or screens aren't insulated. General building guidance says rooms kept apart from the house's heating and cooling are comfortable through much of the year but aren't intended as living space. If you need a room you can use every month, a four season room is the better fit.

Decide before we build, because insulated windows and insulation in the walls, floor and roof go in much more easily during construction, and adding them later can often cost more. Think about whether you want a sheltered spot for the nicer months or a room you'll heat and cool. If you're torn, I'll walk through both on site so you can choose with the numbers in front of you.

Your room may well need one, and the local Building and Safety office is who decides. Its permit list names enclosed patios, additions and larger structures but doesn't name sunrooms, and any permit has to be in hand before work starts, either from that office or through the county's EZ Online Permitting website. A job that needs a permit also falls outside the state's small-job exemption, so it has to be built by a licensed contractor, and we're licensed and insured.

Under the state's contractor rules, a down payment can be no more than $1,000, and the cap is lower on a smaller contract. After that, every payment has to be listed in the contract and tied to work done or materials delivered to your house. Check that the payments in any contract you sign match that before you hand over money.

Build it to the wind speed, snow load and rainfall values San Bernardino County publishes for your community, since those are the numbers the frame, roof and drainage get planned around. The values change from one community to the next, which is why a room in Wrightwood isn't drawn the same as one in Victorville. We're based in Oak Hills and work across the High Desert and the cities around it, so if yours isn't listed, just ask.