Four Season Sunrooms in Rancho Cucamonga CA - A Room You Can Use All Year
Got a patio you only use a few months a year? We build a heated, cooled, insulated room you can sit in every month.
What is a four season sunroom, and is it right for your house?
A four season sunroom in Rancho Cucamonga is a fully enclosed room added to your house, with all-weather windows and its own heating and cooling, so it works as a real room in any month instead of a porch you only use in good weather.
Most calls start with a patio or deck you only use part of the year, or a room somebody else built that leaks and won't close right. The price moves with the size of the room, whether it needs a new foundation, the frame and windows you pick and how the heating and cooling reach it. The schedule turns mostly on whether there's a foundation to pour first and on the permit and inspections when the job needs them. Your own number comes from the written estimate after I measure.
- Licensed and insured.
- Free on-site estimates.
- Replies within 1 business day.
Four season sunrooms, inside and out
How we build a four season sunroom
We start with what the room will sit on, and I'll tell you straight whether your patio can carry a full room or whether it needs a proper foundation first. Then we put the insulation in the walls, floor and roof and the insulated windows into the first drawing, because tearing into new walls later to add them wastes your money. We pick the frame with you, and four season rooms usually go with wood or insulated vinyl over plain aluminum, since the frame has to hold the heat in too. Our crew builds the base, frames and roofs the room, sets the windows and doors so they close right and flashes the roof line where it meets your house so water runs off instead of in. Nothing gets covered with trim that should have been fixed.
If you'll mostly use the room in spring and fall, three season sunrooms are the lighter-built option. If all you want is your covered slab closed in, take a look at our patio enclosures instead.
Why Rancho Cucamonga homeowners call us for four season sunrooms
I come out and measure myself
I come out myself to look at the space and take the measurements, and I'm on the job while our own crew builds it. You're not handed off from a salesman to people who've never seen your patio.
Building these rooms since 2017
I spent years fixing leaky patio covers, sagging enclosures and rushed sunrooms for a property management company before I started building rooms in 2017. So I build against what I used to find, with water running where it should, doors and windows that close right and nothing hidden behind trim.
Licensed and insured, ask about trades
We're licensed and insured. California law keeps a remodeling contractor from contracting for changes to load-bearing footings, foundations, walls or roofs, and from extending heating, cooling, electrical or plumbing into a new room without the right license class or a licensed subcontractor, so ask every bidder who's doing those parts.
We check your address first
Before we start, we check what the city wants for your address, including the updated fire hazard zone map Rancho Cucamonga opened for public review in April 2025. We'd rather know what applies to your lot before the first drawing than after the walls go up.
Get the base and the insulation settled before anything gets built. Send us your address, a few photos of the patio or deck and the layout you have in mind, or call (909) 360-4006. We're based in Rancho Cucamonga and work in the cities around it.
Get a written price on your four season sunroom
Send the form and we'll get back to you within one business day to set a time. I'll come out, measure and give you a free written estimate, with no obligation to go ahead.
- Licensed and insured.
- Free on-site estimates.
- Replies within 1 business day.
What happens after you call about a four season sunroom?
Call or send a message
Call (909) 360-4006 or use the form, and we'll reach back out to set up a visit. Photos of the patio or deck help me show up ready.
I look at the space
I come out, look at the space and what the room will sit on, measure and ask how you'll use it. You get a written estimate with the price for the room we talked through, base and insulation included.
We handle permits and build
Once you sign, we take care of the permit when the job needs one and work with the city's building office through the inspections. Then our own crew builds the room.
Walk the finished room
When it's done, I walk the finished room with you. We open and close the windows and doors and look over the roof line together.
Four season sunroom questions
How much does a four season sunroom cost in Rancho Cucamonga?
A sunroom in Southern California usually costs about $16,000 to $120,000 per project, and that's the going range in the area, not our price. Larger rooms that need a foundation and have heating and air conditioning sit toward the top of it. I'll put your actual price in writing once I've seen the space.
Can a sunroom be built on my existing patio or deck?
It can if you go with a prefab kit and your wooden deck or patio has a level surface, but a site-built sunroom needs a proper building foundation. So a level deck or patio leaves you weighing a kit against a site-built room, and that's worth talking through at the estimate.
How do I decide if my sunroom should open to the house or stay closed off?
Decide by how you want the room treated, because the industry's sunroom standard counts a heated or cooled room that's open to the house as habitable, conditioned space. A room closed off from the house with its own temperature control or system is called non-habitable. Tell me which you're after and we'll plan the doors, heating and cooling around it.
Where do I apply for a sunroom permit in Rancho Cucamonga?
You apply online, because the city's Building and Safety Department takes all permit applications that way. Its list of permits names patio covers, reroofs and solar but not sunrooms, so check with that office about what your room needs. If the room changes the outer shell of the house or its heating, cooling or water heating, the state's energy rules can also call for a certificate of compliance sent in with the permit application.
How do I know the windows in a four season sunroom are good enough?
Ask how the planned windows meet the industry's sunroom standard, which sets requirements for conditioned sunrooms on air leaks, water leaks and how well they hold heat. That's a fair question to put to any contractor bidding your room.
What's the difference between a three season and a four season sunroom?
Heating, cooling and insulated windows are the difference. Three season rooms and enclosed porches generally aren't heated or cooled and use uninsulated windows or screens, where a four season room has all of that built in.
Work that goes with four season sunrooms
Three season sunrooms
Worth pricing side by side if you'll mostly use the room in spring and fall and would rather skip the heating and cooling.
Patio enclosures
A good fit when you mainly want your covered slab closed in against wind, dust and bugs rather than turned into a full room.