Sunroom additions
A true addition extends your house onto new footings, with a roof tied into yours. On sloped Mission Viejo lots, we check the grade and drainage first so the floor sits level.
Apex Mission Viejo Sunrooms and Patios is a sunroom contractor based in Mission Viejo, CA. I look at your yard myself, and our own crew turns patios, decks and worn covers into sunrooms, screen rooms and enclosed patio rooms.

Mission Viejo is where this business started, with screen rooms and patio covers for neighbors on weekends. A lot of the houses here are tract homes with an older concrete patio out back, often under an aluminum cover that's seen plenty of summers, and many yards climb or drop toward a hillside with a raised deck on it. Those patios and decks are where most of our rooms go, so I look hard at what's under them.
The price here moves mostly with the room type and the base. A screen room under a sound cover is the lighter job, a four season room with insulated glass and heating and cooling is the heavier one, and a slab or deck that needs new footings adds work before any walls go up. The schedule turns on the permit and inspections, any HOA sign-off and how much base work there is. Many homes here belong to an HOA, the Lake Mission Viejo Association among them, so we ask about yours on the first visit. After I measure and look over your slab or deck, the written estimate gives you your own numbers.
We do the same work next door in Lake Forest, and in nearby Laguna Hills and Rancho Santa Margarita, where we see the same kind of patios and sloped yards.
A sunroom is only as good as what it sits on. I check the slab or deck on the first visit and tell you then if it needs work, not after the walls are up.
We file the permit and book the city inspections. If your HOA or the city needs something from you, we tell you early so it doesn't hold up the build.
Bigger isn't better if the room sits empty. I'll recommend the type and size that fits how you'll use it, even when that's the smaller room.
A true addition extends your house onto new footings, with a roof tied into yours. On sloped Mission Viejo lots, we check the grade and drainage first so the floor sits level.
Insulated walls, insulated glass and a tie-in to heating and cooling make this a room you use in July and January. It costs more, so pick it if you'll use it daily.
Glass or vinyl panels on a lighter frame, without full insulation. A lot of Mission Viejo patios land here, since the weather lets you use it most of the year.
We close in the patio you already have, using your existing cover when it's sound. If the posts or beams are tired, I'll tell you before we hang a single panel.
For odd-shaped yards, hillside lots and rooms that wrap a corner, we design the frame and glass around the space. You get a room that fits the house instead of a kit.
Our own crew handles the build from footings to trim, so the people who poured the base are the ones setting the walls. That keeps details from falling between crews.
Plenty of rooms here were added decades ago and now leak, sweat or bake. We replace tired panels, roofs and doors, and check the base before deciding what's worth keeping.
Screen rooms are where I started, and they're still the simplest way to sit outside without bugs. A good pick when you want air and shade more than a sealed room.
A lot of our calls start here, with a patio nobody uses. The slab has to carry walls it was never poured for, so I check its thickness and edges before anything else.
Raised decks on sloped lots here were built for chairs, not walls and a roof. We check the posts, beams and footings, and reinforce what needs it before the room goes up.
This is the room you treat like part of the house, with outlets, lighting and steady temperatures year-round. We plan the electrical early, since it shapes where the walls and windows go.
Built under a patio cover with a short wall and sliding windows, these rooms open on good days and close against wind and dust. A sensible middle ground for many backyards here.
A solarium has glass in the roof as well as the walls, which floods it with light. On a west-facing yard, we talk about heat and shade before you commit.
A solid or lattice cover gives you shade now and, built right, can carry an enclosure later. We size the posts and beams with that in mind if you're thinking ahead.
This is the first-visit conversation. I look at the yard, the roofline and how you'll use the space, then tell you which room type fits the way you actually live.
Vinyl frames hold up to sun, need little more than a rinse and insulate better than bare aluminum. They suit homeowners here who'd rather use the room than maintain it.
Send the form and we'll reply within one business day to set a time. I come out, measure and look over your slab or deck, then we send a written estimate. It's free, with no obligation.
I come out to every job myself, so the person who looks at your yard is the one answering for the plan. Our own crew does the build.
We go over screen, three season and four season options standing on your patio, including which costs more and how often you'd really use each one.
We're licensed and insured. Satisfaction guaranteed on every job, and the written estimate spells out the room we're building before you agree to anything.
These come up on most Mission Viejo sunroom jobs, usually before I pull out a tape measure. Here are the straight answers.
Usually, yes. The city requires a permit from its building official before work that builds, enlarges or alters a building or structure, and new wiring, lighting or a heating and cooling hookup needs one too. The code exempts some work, so we confirm the details with the city's Building Services before we file.
The next business day, as long as the request goes in before 4 PM the day before. The city takes all permit applications and inspection requests online, and we book each inspection as the build reaches that stage, so you don't have to track the schedule.
Call the California State License Board at 800-321-CSLB, which is where the city sends homeowners to confirm a contractor is licensed. Mission Viejo doesn't require a business license, so there's no city license to ask for. Check the state license before you sign with anyone, us included.
We build sunrooms and patio rooms in the cities listed below, and they aren't the only places we work. If yours isn't listed, call (949) 619-8191 or send the form and ask.
Call (949) 619-8191 weekday evenings until 9 PM or weekends until 10 PM, or send the form and say how you'd use the room.