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We build sunrooms, patio enclosures, and all-season rooms for homeowners across the Conejo Valley. Fully permitted, locally owned, and built for the California climate.
TOS Thousand Oaks Sunrooms is a licensed sunroom contractor based in Thousand Oaks, CA, offering 16 services across 12 cities in Ventura and Los Angeles Counties. Whether you want to enclose an existing patio, convert a deck into a livable room, or build a fully custom four-season sunroom from the ground up, we handle the design, permits, and construction - start to finish. Our team understands the local building codes, HOA processes, and Conejo Valley climate conditions that shape every project we take on.
Got wasted outdoor space? A sunroom addition turns your backyard into a comfortable room you can use every day of the year.
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Want to use your backyard in January? A four-season sunroom is fully insulated and climate-controlled - it works in any weather.
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In Thousand Oaks, a three-season sunroom works nearly year-round. It is a lighter investment with most of the everyday benefit.
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Tired of Santa Ana winds shutting down your patio evenings? An enclosure turns that outdoor space into a sheltered room you control.
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Every room is built to your layout, not a catalog template. We design around your lot, your roofline, and how you actually live.
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From foundation to final inspection, we manage the full build. Every project is permitted, inspected, and built to California code.
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Old sunroom leaking or drafty? We rebuild problem areas, reseal connections, and bring older rooms up to current standards.
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Bugs ruining your evenings? A screened room keeps insects out while letting the Conejo Valley breeze in - no glass required.
Learn MoreReach out by phone or through our online form. We will respond within 1 business day to set up a time that works for you. Tell us what you have in mind - no blueprints needed. A quick description of your space and how you plan to use it is enough to get started.
We visit your home, measure the space, and look at your existing foundation or patio slab. We also check for HOA requirements and fire-zone considerations that affect the design. You leave the conversation with a clear picture of what is possible and a written proposal within a few days.
Once you sign, we file the permits, handle any HOA submission, and schedule the build. We check in at every milestone and keep you updated so you are never guessing. When the final inspection passes, we walk through the finished room with you and hand over all permit records.
We hold an active California Contractors State License Board license and carry full liability insurance and workers compensation coverage on every project. You can verify our license at cslb.ca.gov before you sign anything.
We are a locally owned company working out of Thousand Oaks. We know the Ventura County permit office, the HOA processes in Conejo Valley neighborhoods, and what the Thousand Oaks climate demands from a sunroom build.
Every estimate starts with a free visit to your home. We measure, assess the site, and give you a written proposal. No pressure, no deposit required to get a quote. You decide if and when you want to move forward.
Every project we complete goes through the full Ventura County permit process. You receive copies of all inspection records - which matters enormously when you sell. Unpermitted additions cost sellers at closing; ours never do.
Questions before you commit? Call (805) 906-7459 or send us a message and we will follow up within 1 business day.
We had been putting off the patio enclosure for two years because we were not sure how the HOA process worked. The team handled every step of the submission for our neighborhood and kept us updated the whole time. We were using the room before the end of summer.
Sandra K., Thousand Oaks - Patio enclosures
The four-season sunroom they built for us came in on the schedule they quoted. The inspector actually commented on how clean the framing was. We use it every single morning for coffee now - even on the cold January mornings we would have been inside before.
David M., Westlake Village - Four season sunrooms
We converted our old deck into an enclosed patio room. They were upfront about what the soil conditions on our hillside lot required for the foundation, which other contractors did not mention. The finished room is level, tight, and has not shifted after two rainy seasons.
Patricia R., Camarillo - Deck-to-sunroom conversion
We respond within 1 business day - no obligation, no pressure. After you submit, someone from our office will call to schedule a free on-site estimate at a time that works for you. We come to your home, measure the space, and leave you with a written proposal.
(805) 906-7459TOS Thousand Oaks Sunrooms is based in Thousand Oaks, CA, and serves homeowners across 12 cities in Ventura and Los Angeles Counties - including Simi Valley, Camarillo, and Westlake Village. Most of our project areas are within a short drive of our office, which means we can typically schedule an on-site estimate within the same week you reach out.
Thousand Oaks winters rarely dip below the mid-40s, so a three-season room works comfortably for most of the year here. But summer afternoons push into the 90s - without insulation and climate control, a south-facing room can feel like a greenhouse by mid-morning. If you plan to use the space from June through August, a four-season build is worth the extra cost.
Yes, always. Any attached structure in Thousand Oaks requires a building permit through the City of Thousand Oaks Building and Safety Division, and the plan check process typically adds two to six weeks before construction can begin. Skipping permits can create serious problems at resale. The California Contractors State License Board requires licensed contractors to pull permits on their clients' behalf.
A large share of Thousand Oaks neighborhoods - including many in Lynn Ranch, Wildwood, and Dos Vientos - have active HOAs with architectural review requirements. HOA approval is a separate process from the city permit and needs to happen first. Missing this step can mean being forced to modify or remove a completed addition at your own expense.
Low-emissivity glass - glass with a thin coating that blocks radiant heat while still letting in light - is the right choice for a sunny Southern California climate. Without it, a west- or south-facing sunroom can become uncomfortably hot by mid-morning in July. The National Renewable Energy Laboratory has published research on window performance in high-sun climates at nrel.gov.
Much of Thousand Oaks sits in a state-designated High or Very High Fire Hazard Severity Zone. This affects the materials that can be used on exterior surfaces and roofing. A contractor who is not current on these requirements can deliver a project that fails an insurance inspection or creates a liability. Ask any contractor you interview whether they have checked your property's fire hazard designation.
If you already have a concrete patio slab in good condition, a conversion project can save you the cost of pouring a new foundation. Your contractor should assess whether the existing slab is level, structurally sound, and properly drained before deciding whether it can serve as the base. On a hillside lot - common in Thousand Oaks - drainage planning is especially important.
TOS Thousand Oaks Sunrooms is a licensed and insured sunroom contractor company based in Thousand Oaks, CA, serving homeowners across 12 cities in Ventura and Los Angeles Counties since 2024.
We hold an active contractor license issued by the California Contractors State License Board, which regulates licensing requirements for all home improvement and construction work in the state.
Our team has completed sunroom builds, patio enclosures, and conversion projects across all 16 of our service types - from basic three-season rooms to fully custom four-season additions with dedicated HVAC. We know what the Conejo Valley climate demands, what Ventura County permit reviewers expect, and what HOAs in this area look for in an architectural submission.
Want to know more about who we are and how we work? Read our full story on the About page.
If you want shade and protection from rain without fully enclosing the space, a patio cover is a faster, lower-cost solution. It is the right fit when you want to keep the open-air feel but need relief from direct sun or occasional rain.
Vinyl frames resist UV damage and do not require repainting, which makes them practical in a high-sun climate like Thousand Oaks. They hold up to thermal expansion better than some wood options and tend to have lower long-term maintenance costs.
Adding a sunroom changes your home's square footage and exterior envelope, so your insurer needs to know about it. In fire-risk areas, the materials used matter - fire-resistant construction may be required, and some carriers adjust premiums accordingly.
Ready to talk through what makes sense for your property? The National Association of Home Builders also publishes guidance on room additions that can help you prepare questions before your first estimate. Call (805) 906-7459 or request a free estimate online.
Thousand Oaks is a planned city of roughly 126,000 residents situated in the Conejo Valley, surrounded by rolling hills and open space preserves. Most of the city was developed between the 1960s and 1990s, leaving a large share of homeowners with properties that are 30 to 60 years old - well-maintained, but often ready for updates that improve livability. Neighborhoods like Lynn Ranch, Newbury Park, and the communities near Amgen's campus are full of single-family homes on medium to large lots where a sunroom or patio enclosure fits naturally into the existing footprint.
The city sits within and adjacent to areas designated as high fire hazard severity zones by the state, a reality that shapes how we design every project. We select materials that meet California fire-resistance standards before finalizing any build plan. The terrain also matters: many Thousand Oaks homes back up to hillsides or canyons, and the clay-heavy soils common in Ventura County can move with the seasons. Our foundation assessments account for both before a single nail goes in. Visitors to The Gardens of the World or hikers heading into the Santa Monica Mountains National Recreation Area know that this part of Southern California rewards people who spend time outdoors - and a well-built sunroom extends that connection into the months when the weather is less cooperative.
TOS Thousand Oaks Sunrooms works throughout Thousand Oaks and the surrounding Conejo Valley, and we understand what it takes to get a permit approved, satisfy an HOA architectural review, and deliver a room that holds up through the Santa Ana wind season and beyond. If your home is in this area and you have been thinking about adding a sunroom, we are your local choice.
By appointment only, no walk-ins.
TOS Thousand Oaks Sunrooms
3139 Los Feliz Dr #8
Thousand Oaks, CA 91362
contact@thousandoakssunrooms.com
Monday to Saturday: 8 AM to 6 PM. Sunday: 10 AM to 2 PM.
Call or submit a request and we will have someone from our team reach out within 1 business day to schedule your free on-site estimate in Thousand Oaks or the surrounding area.
