
Westminster Sunrooms & Patios builds custom sunrooms, patio enclosures, and four-season rooms for Orange County homeowners. Every project is permitted, inspected, and built to last.
Westminster Sunrooms & Patios builds custom sunrooms, patio enclosures, and four-season rooms for Orange County homeowners. Every project is permitted, inspected, and built to last.

Westminster Sunrooms & Patios is a licensed sunroom contractor serving Westminster, CA and 11 surrounding cities across Orange County. We offer 16 services covering every way a homeowner might want to add or improve an outdoor-adjacent room - from a simple screen enclosure to a fully insulated four-season addition. Whether your backyard feels underused or your existing sunroom is showing its age, we can help you figure out the right solution and build it right the first time.

Underusing your backyard? A sunroom addition gives you a light-filled room you can enjoy in any season, without leaving home.
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Want a room that works in January and August alike? A four-season sunroom is fully insulated and climate-controlled for year-round comfort.
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Looking for a comfortable outdoor room without the full cost of a climate-controlled addition? A three-season sunroom is the practical middle ground.
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Tired of bugs, coastal fog, and afternoon glare ruining your patio time? An enclosure turns that slab into a room you actually use.
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Have a specific vision for your space? A custom sunroom is designed from scratch around your home, your yard, and how you live.
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Ready to build? We handle every phase of sunroom construction - from permits through final city inspection - without shortcuts.
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Old sunroom leaking, drafty, or just outdated? We can remodel what you have into a space that works the way it should.
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Want fresh air and the view without bugs? A screen room gives you the outdoors on your terms, evening or morning.
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Already have a covered patio? Converting it to a sunroom is often faster and less expensive than starting from scratch.
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Deck getting worn down or going unused? We can convert it into a permanent, weatherproof room you will actually use every day.
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An all-season room connects to your home's HVAC so it stays comfortable whether it is 90 degrees or 45 degrees outside.
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Your patio has the footprint - we add the walls, roof, and windows to make it a real room without the cost of a ground-up build.
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A solarium maximizes natural light with glass on three sides and overhead, creating a bright, airy space that is unlike any other room.
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Need shade and rain protection before you commit to a full enclosure? A patio cover is a practical first step with real benefits.
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Not sure what you want yet? Our design process helps you figure out the right size, style, and glass before a single permit is pulled.
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Vinyl-framed sunrooms resist moisture and UV damage better than wood, making them a low-maintenance choice for coastal Orange County homes.
Learn MoreReach out by phone or through our online form. We ask a few questions - what you want to use the room for, roughly where on your property it would go, and whether you are in an HOA. We respond within 1 business day to schedule your free on-site estimate. No pressure, no pitch - just a conversation to see if we are a good fit.
We come to your home, measure the space, and look at your existing foundation and exterior wall. Then we walk through design options with you - size, style, glass type, whether heating and cooling makes sense for your situation. You leave that meeting with a written, itemized estimate. We also confirm your permit requirements and HOA situation before you sign anything.
Once you approve the proposal, we file permits with Westminster's Community Development Department and handle HOA documentation if needed. Construction begins once approvals are in hand. We manage every phase - foundation, framing, glazing, finishing - and a city inspector signs off at key stages. When it is done, we walk through the finished room with you and answer every question before we leave.
We hold a current California contractor's license issued by the Contractors State License Board. Every project carries full general liability and workers' compensation coverage - so if something goes wrong on your property, you are protected. Verify our license on the CSLB website before you sign anything.
We come to your home, assess your space, and give you a written itemized quote at no charge. No phone estimates that balloon after the crew shows up. No pressure to sign the same day. You get the full picture - including permit costs and foundation assessment - before you commit to anything.
We are a locally owned company - not a national franchise. We know Westminster's permit process, the clay soils that shift patios over time, and the coastal air that wears on the wrong materials. That local knowledge shows up in every project, from the materials we specify to the way we time permit applications.
We pull every permit and show up for every inspection. No shortcuts, no unpermitted additions that cause problems when you refinance or sell. You receive a copy of the final city sign-off when the job is done - documentation that your room was built correctly, on record with Westminster's building department.
Ready to talk through your project? Call (657) 364-0879 or send us a message.
"We have wanted to do something with our back patio for years. The team came out, showed us what was possible with our existing slab, and had the permit in process within a week of signing. The four-season room they built us gets used every single morning. The timeline they gave us was accurate to the day."
David R., Garden Grove - Four Season Sunrooms
"Our HOA has pretty strict rules about what you can add to the exterior, and I was worried the whole project would fall apart. They knew exactly what documentation our board needed and submitted it ahead of the city permit. The patio enclosure was approved by both within three weeks. I did not have to make a single call myself."
Maria T., Huntington Beach - Patio Enclosures
"Our old screen room was from the late 1980s and had been leaking at the roofline for two summers. They found the flashing problem during the estimate visit and explained exactly what had gone wrong originally. The remodel came in on budget, the leak is gone, and the room feels like it was always part of the house."
James K., Fountain Valley - Sunroom Remodeling
We respond to every request within 1 business day. There is no obligation - submitting this form just gets the conversation started. Once we hear from you, someone from our office will call to schedule a free on-site estimate at a time that works for you.
(657) 364-0879Westminster Sunrooms & Patios is based in Westminster, CA and serves 12 cities across northwestern Orange County - including Garden Grove, Huntington Beach, Fountain Valley, and Santa Ana. We offer same-week scheduling for on-site estimates throughout our service area. If you are in or near any of the cities listed below, we can help.
Yes - any enclosed room addition in California requires a building permit. Skipping it can cause problems when you sell your home or file an insurance claim. The California Department of Housing and Community Development oversees statewide building standards that Westminster applies to all permitted work.
Westminster averages over 280 sunny days per year, and a south- or west-facing sunroom with standard glass can become uncomfortably hot by midday even in winter. Double-pane insulated glass with a low-emissivity coating blocks a significant portion of solar heat while still letting light in - the difference in comfort is real.
Westminster sits about 5 miles from the Pacific, and the salt in that air quietly accelerates corrosion on untreated aluminum frames and hardware. Powder-coated aluminum and marine-grade fasteners cost a little more upfront but can add a decade or more to the life of your enclosure without repainting or replacing hardware.
Many Westminster homes built in the 1960s and 1970s have concrete slabs that are thinner than what a permanent structure requires. A contractor needs to assess slab thickness and condition during the site visit. Some slabs can be reinforced; others need a new pour. This assessment is a normal part of the process - not an upsell.
Westminster temperatures rarely drop below the mid-40s at night, which means a well-built three-season room is usable 10 to 11 months of the year. A fully insulated four-season room costs more but is climate-controlled for every day of the year. The right choice depends on your budget and how you plan to use the space.
A poorly designed sunroom can add heat load to your home, raising cooling costs in summer. The right glass, proper ventilation, and a room orientation that avoids the worst afternoon sun can prevent that. The ENERGY STAR program rates windows and glass panels for solar heat gain - ask your contractor to show you those ratings before selecting glass.
Westminster Sunrooms & Patios is a licensed and insured sunroom contractor based in Westminster, CA, serving 12 cities across northwestern Orange County since 2019. We hold a current California contractor's license issued by the Contractors State License Board, which requires verified insurance and compliance with California's construction standards.
Our crew has built and remodeled sunrooms, patio enclosures, screen rooms, and four-season additions across Westminster and neighboring communities. We handle every project type listed on this site - from a simple patio cover to a fully custom solarium - and every job is pulled with a city permit and closed out with a final inspection.
Want to know more about how we work and who we are? Read about our company.
If you find yourself avoiding your patio because of bugs, coastal fog, afternoon heat, or Santa Ana wind events, a patio cover is not solving your problem. A sunroom with operable windows and proper glass handles all of those conditions and gives you a space you can use every day, not just when the weather cooperates. The National Association of Home Builders offers resources on how enclosed additions compare in terms of livability and return on investment at nahb.org.
An unpermitted addition can complicate or block a home sale - buyers' lenders will flag it, and you may have to pull a permit after the fact or even remove the structure. In Westminster, unpermitted work is not covered by your homeowner's insurance if something goes wrong. Getting the permit done correctly from the start is always the lower-cost path.
Start by looking up the contractor's license on the California Contractors State License Board website. A valid license means the contractor is required to carry workers' compensation and liability insurance. Beyond the license, ask for a written contract with itemized costs, a clear timeline, and permit handling explicitly included in the scope of work.
Ready to take the next step? Call (657) 364-0879 or request a free estimate online and we will get back to you within 1 business day.
Westminster was incorporated in 1957 and built out quickly during the postwar housing boom - most of the city's neighborhoods date from the 1950s through the 1970s. That means a large share of homes are now 60 to 70 years old, with original concrete slabs, older patio covers, and exterior surfaces that have had decades of Southern California sun and coastal air working on them. The city is bordered by Garden Grove, Huntington Beach, Fountain Valley, and Seal Beach, and sits about 5 miles from the Pacific - close enough that marine layer and salt air are a real factor for any outdoor structure. Learn more about Westminster's history and community at Wikipedia's Westminster, California page.
The city is home to Little Saigon, the largest Vietnamese-American community in the United States, centered along Bolsa Avenue. It is also where you will find Westminster Mall, a major regional landmark on Westminster Boulevard, and Sid Goldstein Freedom Park, one of the city's most visited civic spaces, which includes a prominent Vietnam War memorial. Westminster has a population of roughly 91,000 people across about 10 square miles - a densely built, established city where about 55 percent of housing is owner-occupied. Census data on Westminster's housing and demographics is available from the U.S. Census Bureau.
The ranch-style homes that dominate Westminster's neighborhoods - single-story, slab foundation, attached garage, stucco exterior - are exactly the type of home we work on every day. The concrete slabs on those older homes move with the clay soils underneath them, and the coastal air does quiet work on exterior finishes and frames that were not chosen with it in mind. Westminster Sunrooms & Patios has been building and remodeling sunrooms in this community since 2019, and that local experience shapes every recommendation we make about materials, orientation, and foundation work.
By appointment only, no walk-ins.
Westminster Sunrooms & Patios
8331 23rd St
Westminster, CA 92683
hi@westminstersunroomcontractor.com
Always open, 24/7.
Call Westminster Sunrooms & Patios for a free on-site estimate - we serve Westminster and 11 surrounding cities across Orange County.