Four season sunrooms in Ontario CA - a dry, comfortable room you'll use all year
Your patio sits empty half the year because it's too hot or too cold. We build it into a room you'll use every season.
What goes into a four season sunroom in Ontario?
A four season sunroom in Ontario, CA is an insulated glass room with heating and cooling, built so you can sit in it in August and January alike, and at Sunhaven Ontario Sunrooms & Patios we build them in Ontario and the cities around it.
Most people who call me have a patio or deck out back that gets used maybe three months a year, because it bakes in the summer and gets chilly on winter nights. The price of turning that into a four season room mostly comes down to its size, what it sits on, how much glass you want and how it's heated and cooled. The schedule turns on how much base work it needs and how long the city takes to review the plans. Your own figure comes from the written quote after I've measured, and it spells out what's included.
How we build four season sunrooms
We start by settling one question with you, whether the room stays closed off with its own heating and cooling controls or opens into the house like any other room, because that decides the doors, the wall between and the system. I also check which way it faces, since a wall that takes the afternoon sun needs a shade plan before any glass gets ordered. Then I look hard at what it'll sit on, whether that's your slab, your deck or new footings, the concrete pads that carry the posts. Our crew frames the walls and roof, sets the glass and takes its time sealing the joint where the room meets your house, because that seam is where a leak shows up in the first big rain.
Not everyone needs a full four season room. If you only want it for spring and fall and don't plan to heat or cool it, three season sunrooms go up on a lighter build and cost less. If the goal is keeping bugs and dust off a patio you already have, we also do patio enclosures.
Building four season sunrooms in Ontario, CA
The City of Ontario Building Department decides what permits your sunroom needs and reviews the plans, so we don't guess and we don't skip that step. When your job needs one, we draw the plans, file them with the city and schedule the inspections, and I tell you up front that the review takes a while.
Out back, most of the houses we see here have a concrete patio, sometimes under an older aluminum cover that was built for shade and nothing else. A cover like that won't carry glass walls and a real roof, and a slab poured for patio chairs may need new footings at its edge before it can hold a room. We see the same setups on jobs in Chino and Montclair.
How a four season sunroom gets built
Call or send the form
You call (909) 738-1566 or fill out the form, and we get back to you and set a time for me to come out. Mention whether you're starting from a slab, a deck or a patio cover, since that's the first thing I'll look at.
I measure and write the quote
I measure, look at the slab, deck or cover, and ask how you'll use the room, whether that's a den, an office or a place to eat. You get a written quote that spells out what's included, so the price isn't a guess and you can compare it line by line.
We file plans with the city
Once you sign, we prepare the plans and file them, and the city posts about five weeks for a first plan review and about four weeks for each review after that. Those are the city's figures, so check current times with the city's Building Department, and we keep you posted while it runs.
Our crew builds, then we walk it
Our own crew builds the room, and licensed electricians and heating and cooling trades come in for the wiring and the system. When it's finished, we walk the room with you and go over the glass, the doors and the controls.
Get a written quote for your four season sunroom
We reply within one business day and set a time for me to come out, and the on-site estimate is free with no obligation. I'll measure, look at what the room will sit on and send you a written quote that spells out what's included.
Questions before you book a four season sunroom
What sets a four season sunroom apart from one open to the house?
As the sunroom industry defines it, a four season room is closed off from the house and heated or cooled by its own separate system, so it keeps its own temperature apart from the rest of your home. The other type works like a regular room addition and doesn't have to be kept separate, so it can open right into the house. If you'll use it every day as living space, I lean toward opening it up, and if it's a getaway you use some days, closed off with its own controls is the easier room to live with.
How much does a four season sunroom cost in Ontario, CA?
Across the US, a four season sunroom usually costs about $25,000 to $50,000 per job, and that's a national figure, not an Ontario price or ours. Where yours lands depends on the size, the glass, the heating and cooling, and what it sits on, since a deck that needs new beams or footings adds work. The written quote from the estimate gives you your own number.
Can a sunroom go on my deck?
Usually yes, but a sunroom on a deck typically means upgrading the deck first with added beams, posts or footings so it can carry the room's weight and loads. I check the framing under it on the first visit, so that structural work is in the plan and the price from the start instead of turning up once the walls are on order.
How do I apply for a sunroom permit in Ontario, CA?
You apply through the city's Building Department, which takes plans and documents electronically through its online Citizen Portal. On our jobs, we handle that filing for you. The city also warns that it doesn't ask for permit payments by email or wire transfer, so treat an emailed permit invoice as a scam and check with the city before paying anything.
How do I keep a sunroom from overheating in the summer?
Block the sun before it reaches the glass, because window research finds outside shading the most effective way to cut the heat coming through. That's harder on east and west walls, where the sun sits low, and that's where glass with a spectrally selective coating, a clear layer that can turn back a large share of the sun's heat without darkening the view, earns its keep.
How much can a contractor ask for up front on a sunroom in California?
State rules cap the down payment on a home improvement job at $1,000 or 10 percent of the contract price, whichever is less. Any payments after that have to be listed in the contract and tied to work already done or materials already delivered, so ask to see that schedule before you sign.
Why Ontario homeowners call Sunhaven Ontario Sunrooms & Patios for four season sunrooms
The owner measures every job
I come out myself to measure, check the slab or deck and ask how you'll use the room. That way the person pricing your base is the one answerable for what gets built on it.
In business since 2013
I started Sunhaven in 2013 after years on commercial framing and glazing crews, so we're 13 years in. The storefront habits stuck, and the joint where glass meets a wall still gets more attention than most people think it needs.
Licensed and insured for room additions
State law calls work that encloses a structure and pulls in two or more unrelated building trades general building contracting, and a four season room does that with framing, glass, wiring and heating and cooling. We're fully licensed and insured, so a job with that many trades isn't resting on a handshake.
On a four season room, I'd rather spend an extra hour on the base and the joint with the house than have you find a leak later. Set up a time for me to come out and we'll start there.
Other rooms we build
Three season sunrooms
A lighter room for spring and fall evenings, for when you won't need heating or cooling in it.
Patio enclosures
Walls around the patio you already have, for when you want it shaded and bug-free more than you want a full room.
Book your four season sunroom estimate
Call (909) 738-1566 or use the form, tell us which wall the room will face and how you plan to use it, and send a photo of the deck or patio, so I show up knowing what to check.
