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Serving Simi Valley, CA and surrounding areas. (805) 261-5995
Simi Valley Sunrooms & Patios designs and builds custom sunrooms, patio enclosures, and four-season rooms for homeowners throughout Simi Valley and Ventura County.
Simi Valley Sunrooms & Patios is a licensed sunroom contractor company serving Simi Valley and 12 surrounding cities with 16 sunroom and outdoor living services. Whether your back patio gets too hot in July, you want to convert an unused deck, or you need a fully climate-controlled four-season room, we have done this type of project on homes throughout Ventura County and the San Fernando Valley. We handle permits, HOA submissions, and construction from start to finish.
Want more living space without moving? A sunroom addition adds a comfortable, enclosed room that connects your home to your yard year-round.
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Insulated walls, real HVAC, and quality glass mean you can use this room in July or January without thinking twice.
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In Simi Valley's mild climate, a three-season room is usable nine to ten months of the year - and costs less than a full four-season build.
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Already have a patio slab? Enclosing it gives you a fully protected room without tearing up your yard for a new foundation.
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Every home is different. Custom designs match your roofline, your lot, and your goals rather than fitting your house to a kit.
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From concrete foundation to final trim, full-service construction handled by one crew - no juggling multiple subcontractors.
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Old sunroom leaking, drafty, or outdated? A remodel fixes the root problems and brings the space up to current comfort standards.
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Bugs and wind ruining your evenings outside? A screened room keeps the airflow and the view while keeping everything else out.
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Your existing patio is the starting point. Converting it into an enclosed sunroom is often faster and less expensive than building from scratch.
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An elevated deck can become a true room. We handle the structural work to make the conversion solid and code-compliant.
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A fully climate-controlled addition with insulation and HVAC that works as comfortably as any interior room, every single day of the year.
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Turn your covered patio into a room with walls and windows - protected from dust, insects, and Santa Ana winds.
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Maximize natural light with a glass-roof solarium that brings the sky indoors while keeping the temperature under control.
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Not ready for a full enclosure? A solid patio cover blocks heat and rain while keeping your outdoor space open and breezy.
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Before any construction begins, good design prevents expensive changes later - layout, materials, glass specs, and HOA approval in one process.
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Vinyl framing holds up well in Simi Valley's heat without warping, fading, or needing paint - low maintenance, long life.
Learn MoreYou reach out - by phone or online form - and describe what you are thinking. You do not need to have all the answers ready. We ask about the size, location on your home, and how you plan to use the space. If it sounds like a fit, we schedule a free site visit. We respond within 1 business day.
We come to your home, measure the area, look at your existing slab or wall, and check for anything that could affect the design - setbacks, HOA rules, utility lines. Within a few days you receive a written proposal with a clear scope of work, materials, and price. No surprises.
Once you sign, we handle the permit application to the City of Simi Valley Building and Safety Division and any HOA submission. When approvals come through, construction begins. City inspectors check the work at key stages. When the final inspection passes, we do a full walkthrough and hand over your permit paperwork.
We hold a current California Contractors State License Board (CSLB) license and carry full general liability and workers compensation coverage. You can verify our license at cslb.ca.gov before you sign anything.
Every estimate starts with a free visit to your property. We measure, assess your existing slab or wall, and send a written proposal within a few days. No pressure calls, no surprise fees.
We are a locally owned company, not a national franchise. We know Simi Valley's permit process, HOA landscape, and summer heat requirements because we have been working here - not just passing through.
We prepare and submit your City of Simi Valley Building and Safety permit application and help with HOA architectural review. Most homeowners find that the paperwork side of a sunroom project is the most stressful - we take that off your plate entirely.
Ready to talk about your project? (805) 261-5995 or send us a message.
"We had been putting off a sunroom for years because we were worried about the permit process and HOA approval. The team handled both and kept us updated every step. The room was done in about 10 weeks, right on the timeline they gave us. We use it every single morning now."
Maria T., Simi Valley - Sunroom additions
"Our old patio enclosure leaked every time it rained and let in cold air all winter. The new four-season room is a completely different experience - tight, quiet, and comfortable year-round. They also caught a drainage issue during the foundation work that would have been a problem later."
James R., Thousand Oaks - Four season sunrooms
"I work from home and needed a dedicated space with good light and enough quiet to take calls. The three-season sunroom they built off our living room does exactly that. It was done faster than I expected, and they cleaned up completely every day before they left."
Sandra K., Moorpark - Three season sunrooms
We respond within 1 business day - no obligation, no sales pressure. Fill out the form and someone from our office will call to ask a few questions and schedule a free on-site estimate at your home. You will leave that visit with a clear picture of what your project will cost and how long it will take.
(805) 261-5995Simi Valley Sunrooms & Patios serves homeowners across 12 cities throughout Ventura County and the western San Fernando Valley, including Thousand Oaks, Moorpark, Camarillo, and Calabasas. Most projects in the Simi Valley area can be scheduled within the same week for an estimate, and we handle permit and HOA processes in every city we serve.
A three-season room works well here because Simi Valley's winters are mild - most homeowners get nine to ten usable months. A four-season room adds full insulation and HVAC for year-round comfort, but costs more. The right choice depends on your budget and how often you plan to use the space in December and January.
Glass with a low solar heat gain coefficient (SHGC) blocks heat before it enters the room while still letting in light. Combined with a ceiling fan and operable windows for ventilation, a well-specified sunroom stays comfortable even on the hottest summer afternoons. Ask every contractor about SHGC ratings before you commit to a glass package.
Yes. In Simi Valley and throughout California, any permanent room addition requires a building permit from the City's Building and Safety Division. Permits protect you - a city inspector confirms the foundation, framing, and electrical are done correctly. Unpermitted additions can complicate home sales and may void your homeowner's insurance coverage for that space. The California Contractors State License Board recommends verifying permits are pulled before any construction begins.
The details you cannot see on day one are what separate a lasting sunroom from a problem one: properly flashed connections where the new room meets your house, a well-tied foundation on solid footings, and window seals that do not let moisture between the panes. Ask to see photos of completed projects and, if possible, talk to a customer who has lived with the sunroom through at least one rainy season.
A properly permitted and built sunroom adds livable square footage that shows up in your listing and appraisal. In Simi Valley's real estate market, buyers with families often respond well to flexible bonus spaces. Unpermitted additions, on the other hand, are a red flag for buyers' lenders and can delay or derail a sale. Doing it right from the start protects your investment.
A large share of Simi Valley neighborhoods - especially Wood Ranch, Bridle Path, and newer planned communities - require architectural review and written approval from the HOA before any exterior addition begins. This process runs separately from the city permit and can add several weeks. Getting HOA approval before signing a contractor contract can save you from costly design changes later.
Simi Valley Sunrooms & Patios is a licensed and insured sunroom contractor company based in Simi Valley, CA, serving 12 cities across Ventura County and the San Fernando Valley since 2020.
We hold a current license issued by the California Contractors State License Board (CSLB), which is the state authority that licenses and regulates all home improvement contractors in California. Every project we take on is fully permitted, inspected, and backed by our workmanship warranty.
Since 2020, we have completed sunroom additions, patio enclosures, and outdoor living projects across all 16 services we offer - from straightforward patio-to-sunroom conversions to fully custom four-season rooms with climate control and custom rooflines.
If you plan to use the room from March through November and do not need it on the coldest winter nights, a three-season room costs less and is often the smarter choice in Simi Valley's mild climate. A four-season room makes more sense if you work from home year-round or want the room to function like any other interior room regardless of weather.
Doors and windows that stick, visible cracks along the base of the walls, and water pooling inside the room after rain are the most common signs of a foundation problem. In Simi Valley, soil movement and seasonal temperature changes can accelerate these issues on projects where the foundation was undersized or improperly compacted. The National Association of Home Builders recommends getting foundation specs in writing before any project begins.
If your existing concrete patio slab is level, free of major cracks, and in good condition, converting it is usually faster and less expensive than demolishing it and pouring new. A contractor should assess the slab's condition and thickness before recommending one way or the other. An undersized slab that was never intended to support a room addition is not worth keeping.
If you are ready to move from planning to getting an actual number, the easiest next step is a free on-site estimate. Call (805) 261-5995 or send us a message online.
Simi Valley is a city of about 126,000 people in Ventura County, roughly 35 miles northwest of downtown Los Angeles. The city sits in a valley ringed by the Santa Susana Mountains and rolling hills on all sides. Most of the housing stock was built between the 1960s and 1980s during large-scale tract development, which means a lot of homes in the city are now 40 to 60 years old and due for meaningful upgrades. Homeownership rates here are well above the California average, and most residents are long-term owners who invest in maintaining and improving their properties.
The city is home to landmarks that residents know well - the Ronald Reagan Presidential Library on a hilltop in the western part of the city, the Simi Valley Town Center serving as the main shopping and gathering area, and the planned community of Wood Ranch on the eastern side of the city with its own golf course and some of the newer, larger homes in the area. Neighborhoods range from older single-story ranch homes near the city center to newer two-story houses in the northern and eastern tracts. Many of these neighborhoods also fall under HOA rules, which affects exterior additions like sunrooms.
Simi Valley's inland valley location creates a climate that is genuinely beautiful most of the year - over 280 sunny days annually - but summer heat is real, with temperatures regularly reaching the mid-90s from June through September. Santa Ana wind events in fall and early winter bring gusts that can hit 50 mph and stress any outdoor structure not built to hold up to them. These are not abstract concerns for homeowners here; they are conditions that a contractor needs to build around from the start. Simi Valley Sunrooms & Patios has been designing and building sunrooms in Simi Valley since 2020, and every project we take on is built to handle the specific conditions of this valley.
By appointment only, no walk-ins.
Simi Valley Sunrooms & Patios
831 Ayhens St
Simi Valley, CA 93065
Get a free on-site estimate from a licensed sunroom contractor in Simi Valley. We handle permits, HOA submissions, and construction from start to finish.