Sunroom additions in Corona CA - a room built on a sound base and sealed tight
Your patio sits unused half the year. We add a room you can enjoy in more seasons, planned and explained before any work starts.
What goes into a sunroom addition in Corona?
A sunroom addition in Corona adds an enclosed room to your house. It can be a three-season room that stays closed off from the house, or a heated or cooled room that opens into it as everyday living space, so a patio you rarely use becomes part of your home.
Most homeowners who call us have a patio, deck or cover they'd like to use for more of the year, and the first question is which kind of room fits the way they'll use it. Most of the price comes from that choice, the size of the room, the condition of your slab and extras like insulation, heating and cooling, or plumbing. The schedule mostly depends on whether we need a new base and how long the city's review takes, and your written estimate shows the figure for your own room before you agree to anything. We're licensed and insured, and in California adding onto a house counts as home improvement work, which calls for a contractor licensed by the Contractors State License Board. We're based in Corona and work in the cities around it, and we're glad to hear from homeowners a little farther out too.
What happens after you call us about a sunroom addition?
Call or send the form
Call (951) 281-8086 or use the form, and we'll set a time for me to come out to your house. I look at the space, check the slab and take the measurements myself.
Get your written estimate
You get a written estimate that shows the room type, the materials and what's included, so you can see what you're paying for line by line. If your slab needs replacing or you want heating and cooling, it's on the estimate from the start, not added as a surprise later.
We check the city's requirements
Before we put you on the schedule, we check what the building office expects for your address. When your job calls for a permit, we prepare the paperwork and work through the process with you.
Build and walk through together
Our installers and I build the room together, so the person who measured it is on site for the whole job. When it's done, I walk through the finished room with you before we call it complete. Satisfaction guaranteed.
How we build a sunroom addition
The first thing we settle with you is whether the room stays closed off from the house or opens into it as living space, because that choice decides the windows, the insulation and whether heating and cooling come into the plan. Then I look closely at what the room will sit on. If your patio slab is worn or cracked, I'll tell you plainly and plan for a new base instead of building over trouble. From there our crew prepares the base, frames the walls and roof, sets the windows and doors and seals every joint, since a room is only as good as what it sits on and how well it's sealed. We finish the gutters and trim and clean up so the room is ready to furnish.
Most additions end up as one of two rooms. A three season sunroom is a bright, enclosed space that stays separate from the house, and it's the simpler build. A four season sunroom is heated or cooled and opens into the house, so its windows and doors have to meet set standards for air leaks, water leaks and holding heat, and the state Energy Code has efficiency requirements that apply to additions. We'd suggest the three-season room if you mostly want shade and a spot out of the wind, and the four-season room if you want a true extra room you'll use every day.
Get a written estimate for your sunroom addition
We reply within one business day and set a time for me to come out, measure the space and look at your slab. The estimate is free and done on site, with no pressure and no obligation, and you get it in writing.
Sunroom addition questions from Corona homeowners
How much does a sunroom addition cost in Corona?
A three-season sunroom built on an existing base, with standard-grade windows and roofing, usually costs about $130 to $190 per square foot in Corona. The extras mentioned above add to that, and so does a new slab if yours isn't sound. Your written estimate shows the figure for your own room.
How do I know if my old patio slab can hold a sunroom?
Usually it can only if it's close to new. One sunroom maker's installation guide prefers a new slab or deck and accepts an existing one only in like-new condition, because a slab with a lot of buckles or cracks can lead to leaks later. That's why we plan a new base when a patio is worn, and I'll tell you what I see at the estimate.
How much can a contractor ask up front for a sunroom in California?
State rules cap the down payment at $1,000 or 10 percent of the contract price, whichever is less. Later payments are listed in the contract and tied to work completed or materials delivered, so you pay as the room takes shape. The rule applies to any contractor you hire for this work.
Do I need a permit to add a sunroom in Corona?
Plan on your sunroom going through the city's plan review, which lists room additions among the residential projects it reviews. We check what the building office needs for your address, and the city's checklist asks every contractor and subcontractor on the job to show proof of state and city licenses. If you'd like to ask the city yourself, Corona's building office takes plan review questions at 951-736-2250 or BuildingPlanCheck@CoronaCA.gov.
Do fire zone rules affect a sunroom addition in Corona?
They can, depending on where your house sits. Corona asks permit applicants in the Very High Fire Hazard Severity Zone to show the structure meets the California Building Code's wildfire construction rules, and new construction in a Wildland Urban Interface Fire Area has to meet those same rules. The city said High zones would follow the same standards once a new map was adopted, which it planned for July 2025, so check the city's fire hazard zone maps for your address and we'll plan the room around what applies.
How do I take care of a sunroom after it's built?
Have the roof and gutters inspected once a year, as one maker's owner guide suggests. The same guide says to clean door and window tracks with a pure silicone spray instead of an oil-based lubricant, and to keep the weep holes, the small drain openings, clear.
Rooms we often build as additions
Three season sunrooms
A good fit if you want a bright, sheltered spot for most of the year without heating or cooling another room.
Four season sunrooms
Worth a look if you want the new space to feel like part of the house and be comfortable in any month.
Tell us about the room you have in mind
Call (951) 281-8086 or send the form with the room type you're leaning toward, a rough size and a few photos of your patio, and I'll come out already knowing what to look at.