
Costa Mesa Sunrooms & Patios designs and builds sunrooms, patio enclosures, and four-season rooms for homeowners across Costa Mesa and Orange County. We handle permits, HOA submissions, and the full build - you just enjoy the result.

Costa Mesa Sunrooms & Patios is a locally owned sunroom contractor serving Costa Mesa, CA and 11 surrounding Orange County communities. We offer 16 services - from new sunroom additions and four-season rooms to patio enclosures, conversions, and design consulting. Every project is fully permitted, handled by licensed and insured tradespeople, and backed by a written warranty.

Losing hours to the morning marine layer? A new sunroom gives you a warm, light-filled room with a full view of your yard - usable even on foggy days.
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Afternoon sun making your patio unbearable by noon? A four-season room with low-E glass stays comfortable from morning to evening, every day of the year.
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Want more protected outdoor space without the cost of a full addition? A three-season room is a comfortable middle ground that works nearly year-round in Costa Mesa.
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Already have a patio but coastal winds and marine air make it uncomfortable? An enclosure turns that underused space into a real room you actually live in.
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Your home has a specific roofline, lot shape, or style that standard kits won't fit. A custom-designed sunroom is built to match your home exactly.
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Need someone to manage the whole build, not just one part of it? We handle permits, foundation, framing, glass, and finish from start to final inspection.
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Drafty windows, water stains, or fogged glass in an older room? We rebuild or update existing sunrooms to meet today's energy and weatherproofing standards.
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Bugs and light wind keeping you from using your patio in the evenings? A screen room keeps insects out and gives you open-air comfort all season long.
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You already have the slab - why not use it? We assess your existing patio and convert it into a proper enclosed room, often reducing both cost and timeline.
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Got a deck that collects leaves but never gets used? We enclose wood or composite decks into weatherproof rooms without tearing out what you already have.
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Want a room that works on a 45-degree January evening and a 90-degree September afternoon? All-season rooms are insulated and climate-controlled for any weather.
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Looking for something between a screened porch and a full sunroom? Enclosed patio rooms give you walls and a real roof without the cost of a full room addition.
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Want maximum natural light and a greenhouse-like feel? A solarium uses glass panels on the roof and walls to flood a room with daylight from every direction.
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Need shade and rain protection without a full enclosure? A patio cover is a fast, affordable upgrade that makes your outdoor space usable on more days.
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Not sure what type of room fits your home, your lot, and your HOA? Our design process figures out exactly what will work before anything gets built.
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Want a low-maintenance room that holds up against salt air and coastal humidity? Vinyl frames resist corrosion and fading far better than aluminum in this climate.
Learn MoreReach out by phone or the contact form. Tell us roughly where the room would go, how you plan to use it, and what your timeline looks like. We respond within 1 business day and schedule a free on-site visit at your convenience - no pressure, no commitment required at this stage.
We visit your home to look at the space in person - checking the existing slab, sun angles, property lines, and your HOA rules if applicable. After that visit, you receive a detailed written proposal covering design options, materials, timeline, and a fixed price. We answer every question before you decide.
Once you sign off, we submit the permit application to the City of Costa Mesa and handle HOA submissions if needed. When approvals are in hand, we build to the agreed scope and schedule. A city inspector signs off at the end, and we walk you through the finished room before we consider the job done.
We hold an active California Contractors State License Board (CSLB) license and carry general liability and workers compensation insurance on every project. You can verify our license number at the CSLB website before signing anything - we encourage it.
We have been building sunrooms in Costa Mesa and Orange County since 2018. We know the local HOA boards, the City of Costa Mesa Building Safety Division, and the coastal conditions that affect materials and design choices. You get a contractor who already knows your neighborhood.
Every estimate starts with a visit to your home - no ballparking over the phone. We look at your slab, your sun exposure, your HOA requirements, and your property lines before putting a number in writing. You get a detailed, fixed-price proposal, not a vague range that changes once work starts.
Every project comes with a written warranty covering both workmanship and materials. If anything leaks, drafts, or fails in the first year, we come back and fix it at no charge. We also specify coastal-rated materials so you're not dealing with corroded hardware or fogged glass panels a few years after the build.
Ready to get started? Call (949) 741-7402 or send us a message.
"We had an existing concrete patio that the team assessed and said was solid enough to build on - that saved us about two weeks. The three-season room went up in about 12 days of actual construction. No surprises on the final bill and the HOA approved the design on the first submission."
David R., Costa Mesa - Three season sunrooms
"I was hesitant because I had heard horror stories about permits taking forever. They pulled the city permit, handled our Mesa Verde HOA submission, and kept us updated the whole time. The four-season room is comfortable even when the Santa Ana winds kick up - exactly what we wanted."
Karen M., Newport Beach - Four season sunrooms
"We converted an old deck into an enclosed patio room and the result looks like it was always part of the house. The team identified a couple of soft spots in the deck framing during the estimate and fixed them before enclosing - I appreciate that they told us about it upfront rather than discovering it mid-job."
Tom and Lisa B., Huntington Beach - Deck-to-sunroom conversion
We respond within 1 business day - no obligation, no pressure. After you submit, someone from our office will call you to schedule a free on-site estimate at your home. We look at your space in person before putting any numbers in writing.
(949) 741-7402Costa Mesa Sunrooms & Patios is based in Costa Mesa and serves 12 communities across Orange County, including Newport Beach, Irvine, and Huntington Beach. Most of our service area is within a 20-minute drive of our office, and we can typically schedule an on-site estimate within the same week you reach out.
A sunroom is one of the most meaningful improvements you can make to a Southern California home - but it helps to understand what you are deciding before you start comparing quotes.
Yes - more than almost any other decision. In Costa Mesa's sunny climate, the wrong glass can make a room unbearable by noon even in mild weather. Low-emissivity (low-E) glass filters heat while letting light through, and the U.S. Department of Energy recommends it as a baseline for Southern California climates. Pair it with thermally broken frames and you have a room that stays comfortable without constant air conditioning.
In most of the U.S., this is a clear-cut decision. In Costa Mesa, it is more nuanced. Winters are mild enough - rarely below 50 degrees - that a well-built three-season room is genuinely comfortable for ten or eleven months. The real question is whether you want heating and cooling or are comfortable opening windows when it gets warm. A four-season room costs more, but the comfort ceiling is higher year-round.
An unpermitted room addition can complicate or kill a home sale, void your homeowner's insurance coverage for that space, and result in a forced removal order. In Costa Mesa, the Building Safety Division requires permits for all room additions - it is not optional. A permitted project also means a city inspector independently verifies the work, which protects you from shortcuts you might never otherwise see.
Salt-laden marine air is one of the most demanding environments for any outdoor or semi-outdoor structure. Aluminum frames oxidize, standard hardware corrodes, and poorly sealed glass panels trap moisture inside the panes over time. In Costa Mesa, specifying coastal-rated materials is not a luxury - it is the difference between a room that looks good in ten years and one that needs major repairs.
Many Costa Mesa homes have original 1950s-1970s slabs that are thick enough to support a sunroom as-is. Others need reinforcement or new footings - especially if the slab has settled unevenly or shows significant cracking. A contractor should assess your slab during the estimate visit, before quoting. Discovering slab problems mid-build is one of the most common sources of cost surprises on sunroom projects.
Yes - if your neighborhood has an HOA, their approval is required before you can submit a city permit application. HOAs in areas like Mesa Verde and communities near South Coast Plaza can have specific requirements about roofline style, exterior colors, and glass percentage. HOA review timelines vary widely - some boards meet monthly, others quarterly - so starting that process early is essential to keeping your project on schedule.
Costa Mesa Sunrooms & Patios is a licensed and insured sunroom contractor company based in Costa Mesa, CA, serving 12 communities across Orange County since 2018. We hold an active license issued by the California Contractors State License Board (CSLB), California's primary authority for contractor licensing and oversight. Since 2018, we have completed sunroom additions, patio enclosures, and seasonal room projects across all 16 service types we offer. Every project is permitted, inspected, and backed by a written warranty. Learn more about our team and approach.
Earlier than you think. Permit review and HOA approval together can add six to twelve weeks before construction starts. If you want to enjoy the room by a specific season, work backward from that date and start conversations now.
Ask any contractor you interview to assess your slab condition during the estimate - not as a discovery mid-build. A contractor who does not evaluate the slab before quoting is more likely to come back with a change order after work has started.
Compare written line-item proposals, not ballpark totals. A quote that looks lower may exclude the permit, foundation assessment, or electrical work. Make sure each proposal covers the same scope before deciding on price.
Questions? We are happy to walk you through the process with no obligation. Call (949) 741-7402 or send a message online.
Costa Mesa is a city of about 115,000 people in Orange County, sitting roughly three miles from the Pacific Ocean. Most of the city's single-family homes were built between the 1950s and 1970s - ranch-style and tract homes on concrete slab foundations, many with original patios that are well-suited to sunroom conversions or enclosures. Landmarks like South Coast Plaza and the Segerstrom Center for the Arts sit near the center of the city, with established residential neighborhoods - Eastside, Mesa Verde, College Park - spreading out in every direction.
The coastal proximity that makes Costa Mesa such a desirable place to live is the same thing that affects outdoor spaces and home improvements here. Marine layer fog keeps mornings cool and damp from May through September - the main reason so many homeowners tell us they have a patio they barely use until noon. Salt air from the ocean accelerates wear on metal fixtures and window seals faster than homeowners expect, which is why materials rated for coastal exposure matter in every project we build here. The OC Fair and Event Center is a landmark residents across the city know well - and the neighborhoods around it, like the blocks leading into Mesa Verde, represent the mix of older homes and larger lots where we do much of our work.
We have been working in Costa Mesa since 2018 and have built sunrooms in neighborhoods from the Eastside bungalows near Newport Beach to the larger Mesa Verde lots in the north. We know the city's building department, common HOA requirements, and which soil and slab conditions tend to come up in older parts of town. When you hire us, you are working with a team that already knows this community - not a company dispatched from two counties over.
By appointment only, no walk-ins.
2423 Andover Pl
Costa Mesa, CA 92626
projects@costamesasunroomcontractor.com
Always open, 24/7.
Call (949) 741-7402 or send us a message - we schedule free on-site estimates across Costa Mesa and Orange County within the week.