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Serving Fullerton, CA and surrounding areas. (657) 632-9118
SunPort Fullerton Sunrooms & Patios builds enclosed patio rooms, sunroom additions, and patio enclosures throughout Whittier, CA - including patio-to-sunroom conversions, four season rooms, and screen room installations. Whittier has a large share of older homes on established lots, and we know how to build on them properly. We have served the greater Orange County and Los Angeles border region since 2025 and respond to all inquiries within one business day.
A large share of Whittier's postwar ranch homes have covered rear patios on original concrete slabs that have held up well after 60 or 70 years. Our enclosed patio rooms work with what you already have - we assess the existing slab, cover, and exterior wall, then add the framing, glass panels, and exterior finish so the finished room blends with the original house rather than looking like an add-on.
Whittier's 1950s and 1960s homes sit on lots large enough to support a full room addition in most cases. We evaluate the existing foundation, framing, and soil conditions before any design work begins - particularly important on this city's older homes, where post-seismic settling and clay soil movement can affect how the addition is engineered and attached.
Many Whittier homes have aluminum patio covers that were installed decades ago and have become the foundation for a real enclosure project. Converting an existing covered patio to a fully enclosed room is typically faster and less expensive than new construction, and it makes good use of structure that is already in place.
Whittier summers run hot and long - temperatures regularly reach the 90s from May through October, and Santa Ana winds in fall bring sudden dry heat. A properly built four season room with low-emissivity glass and a dedicated mini-split stays comfortable in both conditions, giving you a functional space year-round rather than one you avoid during the hottest and windiest months.
Whittier's larger lots - especially in Friendly Hills - often have outdoor patio areas that get underused once summer heat sets in. Converting an existing patio into a climate-controlled sunroom extends the usable season significantly without requiring the excavation and foundation work of a ground-up room addition.
Whittier's spring and fall seasons - when daytime temperatures are mild and the Santa Anas have not yet started - are ideal for screened outdoor living. A properly fitted screen room keeps the air moving while blocking insects and blowing debris, making a covered back patio genuinely usable during those comfortable shoulder-season months.
Whittier sits about 12 miles southeast of downtown Los Angeles in Los Angeles County, and a large share of its homes were built in the 1940s through 1960s during Southern California's postwar building boom. These homes are 60 to 80 years old now, and the conditions that matter for sunroom work - foundation integrity, exterior wall framing, concrete slab quality, and soil stability - need to be evaluated on a house-by-house basis rather than assumed. The city is also in a seismically active part of the region, and the 1987 Whittier Narrows earthquake caused significant structural damage to older buildings. Smaller tremors since then have continued to affect foundations and masonry on properties that were not fully repaired or upgraded. Any sunroom or patio enclosure attached to an exterior wall that has shifted even slightly needs to account for that movement in how the connection is engineered.
The Friendly Hills area in the southern part of Whittier adds another layer of complexity. Hillside lots have drainage patterns, slope considerations, and retaining wall conditions that flat-street homes do not deal with. Whittier also gets strong Santa Ana wind events each fall - gusts that can strip roofing, damage stucco, and expose weaknesses in older exterior walls. A sunroom attached to a wall that takes the brunt of those winds needs proper flashing, weatherstripping, and glass specifications that can hold up to that kind of seasonal stress. Clay-heavy soils throughout the city swell and shrink with seasonal moisture, putting constant pressure on concrete slabs and foundations over time.
Our crew works throughout Whittier regularly, and we understand the local conditions that affect sunroom contractor work here. We pull permits from the City of Whittier Community Development Department and know what their plan check process requires for room additions, patio enclosures, and structural modifications to existing exterior walls. When we work on a hillside property in Friendly Hills, we approach the site assessment differently than a flat-lot job on a street near Uptown - drainage, slope, and the condition of any existing retaining walls all factor into how we design and build.
Whittier has a real sense of neighborhood identity. Uptown Whittier is the city's historic commercial core, and the residential streets around it are some of the older housing in the city - original 1940s and early 1950s bungalows and ranch homes that require careful assessment before any structural work. Whittier College anchors the central part of the city, and Whittier Narrows Recreation Area on the northern edge is a landmark most long-time residents know well. We have worked on homes in every part of the city and understand how different the housing looks from one neighborhood to the next.
We also serve homeowners in neighboring La Mirada to the south and Buena Park to the west. If your home sits near either border, we cover your area.
Reach us by phone or through the contact form and describe what you have in mind. We respond within one business day and schedule an on-site visit at a time that works for you.
We visit the property and evaluate the existing slab, exterior wall, foundation, and drainage before producing a design or price. For Whittier homes - especially older ones or hillside properties - this assessment determines what is feasible and identifies anything that needs to be addressed before construction begins. The written estimate you receive reflects what is actually there.
We handle the City of Whittier permit application, including drawings and plan check coordination. Construction begins once the permit is approved - typically two to five weeks for the build phase depending on scope.
We schedule and pass the city's final inspection before calling the job complete. You receive documentation confirming the permit is closed, which protects your project at any future sale or refinance.
We serve homeowners throughout Whittier - from Friendly Hills to the neighborhoods near Uptown. No pressure, no obligation. Just a straight conversation about what your project needs.
(657) 632-9118Whittier is a city of about 87,000 people in Los Angeles County, roughly 12 miles southeast of downtown Los Angeles. The city has its own identity - a real downtown in Uptown Whittier, a notable college campus at Whittier College, and distinct neighborhoods that feel different from one part of the city to the next. Most of the housing was built between the 1940s and 1970s, giving Whittier a mature residential character - established lots, mature trees, and homes with the kind of original concrete and stucco work that has been through decades of California sun and seismic activity. About 55% of homes are owner-occupied, and residents here tend to stay for many years.
The Friendly Hills neighborhood in the southern part of the city sits on rolling hills with larger lots and more custom homes - a noticeably different feel from the flat, closely spaced streets near the city center. The Whittier Narrows Recreation Area on the northern edge of the city offers open space and is a well-known local landmark. Whittier borders La Mirada to the south, and homeowners near that boundary often have similar housing profiles - postwar ranch homes on established lots that are good candidates for enclosed patio rooms and sunroom additions.
Convert your existing patio into a fully enclosed sunroom space.
Learn MoreWe serve homeowners throughout Whittier and respond within one business day. Call now or submit your info online to get started.