Sunroom Contractor in Westminster, CA - Rooms Built Onto Tract-Home Patios
Seal Beach Sunrooms & Patios is a sunroom contractor building sunrooms, patio enclosures and screen rooms on Westminster homes, fitting each room to the house so an old slab patio or cover becomes a room you use.

- Fully licensed and insured.
- Free estimates at your property.
- Expect a reply within 1 business day.
About Westminster, CA
Westminster sits next to Garden Grove and Fountain Valley, and it's home to Little Saigon, the heart of Orange County's Vietnamese community. The main roads are busy with shops and restaurants, and the blocks behind them are almost all houses. Most of what we see on jobs there are single-story stucco homes on modest lots, each with a patio out back and a family that wants more room without moving.
From the street those neighborhoods can look uniform, but the backyards rarely are, because owners have added covers, slabs and rooms over the decades. That's why I want to see the back of the house before we talk about a room, since the slab, the roofline and whatever's already attached decide what we can build.
Services in Westminster, CA
Patio enclosures
A lot of Westminster backyards already have a concrete patio under a cover, and closing it in is often the simplest way to get a room you'll use. We check whether the slab and cover can carry walls and windows before we plan around them.
Screen room installation
If you want the patio for evenings and don't need a heated room, a screen room keeps the bugs out without paying for glass and insulation. We handle screen room installation on the same slabs and covers we see all over the city, sealed where it meets the stucco.
Four season sunrooms
When the room has to work as an office or a family room every month of the year, a four season room with insulated walls and roof is the one to build. We tie it into the house so it feels like part of the home, not something bolted to the back.
Patio-to-sunroom conversion
Many older patios here were poured for chairs and a grill, not as a base for walls, so a conversion starts with finding out what's under you. We add footings where the slab can't carry the load, then build the room on top.
Sunroom remodeling
Houses from the tract-home years often picked up a room addition somewhere along the way, and by now the joints leak or the windows are tired. We open up the trouble spots, reseal where the room meets the house and replace what's worn out.
Patio cover installation
Some owners here want shade over the patio now and walls later, so we build the cover with that in mind. We size the posts and beam so the cover is easier to enclose down the road if you decide on it.
Permits, licenses and what sets the price in Westminster
In Westminster, the permit for a sunroom comes from the city's Building Division. That same office processes contractor business licenses, so it's also the place to check whoever you hire. The city's FAQ says contractors need a valid state license, workers' insurance and a City business license, and we're fully licensed and insured. We find out what the city will ask for, pull the permits and set up the inspections, and the schedule mostly turns on which review path the city puts your plans on. The price turns on the room's size, whether it's heated, the glass and roof you pick and how much of the old slab and cover can stay, and my written estimate puts a figure on your house.
Most of our Westminster jobs are on residential streets behind the busy commercial roads, where houses sit close and side yards are narrow, so we plan how glass panels, beams and the crew get from the curb to the backyard before the first delivery. Neighbors are close too, so we keep materials on your lot and clean up as we go. It's the same kind of work we do just south in Huntington Beach, with the same crew.
Westminster, CA properties and local conditions
Much of Westminster was farmland until the late 1950s and 60s, when it filled in with tract homes during the county's population boom, and those houses are most of what we build onto now. Their back patios were usually poured for outdoor furniture, not to hold up walls and a roof, so we check the slab's thickness and edges before deciding whether to build on it or add new footings. The other half of the job is where the room meets the stucco, and that's the joint I spend the most time on, because that's where a room leaks if it's going to.
Plenty of these yards also have an aluminum patio cover someone added years ago. Some can be enclosed and some were never sized for walls, so we look at the posts, the beam and how it's fastened to the house before we promise you anything.
Get a free sunroom estimate at your Westminster home
Send the form or call (562) 200-7987, and expect a reply within one business day to set up a visit. I come out myself to your Westminster house, look at the patio and walls with you and give you a free written estimate right at your property. No pressure, no obligation.
How a sunroom job goes when you call us in Westminster
Call us or send the form
Tell us a little about the house and the patio or deck you want to use more. We set a time for my visit, and it helps if you're home so we can talk about how you'd use the room.
I visit and sketch options
I look at the house, the patio and how the room would join the roof and walls, and I sketch the options with you right there. Your written estimate lays out heated and unheated choices side by side, so you know what each one costs before you decide.
We pull permits, city reviews
We draw up the plans, pull the permits and set up the inspections, so you don't have to stand in line at the city. If the plans fall outside the city's over-the-counter review, standard plan check takes 15 to 30 business days depending on how many plans are ahead, and a recheck after corrections takes 7 to 14 working days.
We build, then walk through
Our crew and I build the room, and I'm on site working alongside them. When it's done I walk the room with you and show you how to look after the seals, glass and screens.
Frequently asked questions
Do I need a permit to build a sunroom in Westminster?
Plan on it, because the city requires a permit when a building is constructed, enlarged or altered, and adding a sunroom does that to your house. The exceptions listed in the city's Building Division FAQ include work like painting, stucco repair and low partitions, not new rooms. The city also wants a building permit and a declaration in place before construction starts, so we don't start until both are done.
Can I get a patio cover permit the same day in Westminster?
Often, yes, because the city normally checks residential patio covers over the counter, and most accessory projects with plans based on City Standards get their permit the same day. Projects that need a look from fire, planning or engineering, or that fall outside that list, go to standard plan check instead. We'll tell you which path your project is likely to take when we draw it up.
Who can pull a building permit in Westminster, me or my contractor?
Either of you can, since the city lets a property owner pull most permits, lets an agent with written authorization pull them and lets a licensed contractor pull them. The city recommends having the contractor pull the permit, to protect you from possible liabilities. We pull the permits on our jobs, and you can follow the application on the city's online permit portal.
How do I know if my sunroom needs plans from an architect or engineer in Westminster?
The city says an architect or engineer prepares and signs plans, except for one-story conventional residential buildings and minor additions or improvements as the code defines them. Whether your room counts as a minor addition depends on its design. We sort that out as we draw it up, and you'll know before you sign whether the plans need an engineer's signature.
What is the best way to choose between a three season and a four season room in Westminster?
Start with how you'll use it, because a four season room is insulated and heated like the rest of the house, while a three season room is lighter, costs less and isn't meant to be lived in every day. A home office or a room for a parent usually points to four season, and a spot for evenings and weekends usually points to three season. I'll lay both out at the estimate so the choice is really yours.
How much does it cost to add a sunroom in Westminster?
I can give you a real number once I've seen your house, because the price here depends mostly on size, heating, the glass and roof, and what shape the old slab and cover are in. On Westminster's older tract homes, new footings or a fresh tie-in to the roof is usually what pushes the number up, and a sound slab you can keep brings it down. The written estimate after my visit puts a figure on your job.
Service areas
Seal Beach, CA
View area
Huntington Beach, CA
View area
Garden Grove, CA
View area
Long Beach, CA
View area
Costa Mesa, CA
View area
Norwalk, CA
View area
Irvine, CA
View area
Fountain Valley, CA
View area
Cypress, CA
View area
Lakewood, CA
View area
Bellflower, CA
View area
Explore the services
Sunroom additions
View service
Four season sunrooms
View service
Three season sunrooms
View service
Patio enclosures
View service
Custom sunrooms
View service
Sunroom construction
View service
Sunroom remodeling
View service
Screen room installation
View service
Patio-to-sunroom conversion
View service
Deck-to-sunroom conversion
View service
All season rooms
View service
Enclosed patio rooms
View service
Solarium installation
View service
Patio cover installation
View service
Sunroom design
View service
Vinyl sunrooms
View service
Seal Beach, CA
Start planning your Westminster sunroom today
Call (562) 200-7987 or use the form, and we can check your slab and roofline before you settle on a design, while changes are still just lines on a sketch.




