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Serving Union City, CA and surrounding areas. (510) 738-1709
Union City Sunrooms & Patios builds enclosed patio rooms, sunroom additions, and patio enclosures for San Lorenzo homeowners. We have served the East Bay since 2016, we understand the Bohannon-era homes that define this community, and we permit all work through Alameda County so your addition is on record and covered by your homeowners insurance.
Most San Lorenzo homes were built with small concrete patios that have been sitting unused or underused for decades. Our enclosed patio rooms service converts that existing slab into a comfortable year-round space, working with the footprint already there so you get the most room for the least disruption to the yard.
San Lorenzo homes are compact, and a patio enclosure is one of the most efficient ways to add square footage without a full room addition. Because most original patios here are concrete slab from the Bohannon era, the foundation work is often minimal and the project moves faster than starting from bare ground.
If your backyard has space beyond the existing patio, a sunroom addition builds out new square footage from the ground up. For San Lorenzo homeowners on tight lots, we design additions that respect property lines and setbacks while maximizing usable floor space for the rooms most people want: a reading room, a home office, or a casual dining area facing the yard.
San Lorenzo winters are mild enough that a three-season room works well for most of the year. With screened panels for summer ventilation and solid glazing for the rainy months, this option gives San Lorenzo homeowners a livable outdoor-connected space without the cost of full insulation and HVAC integration.
The East Bay's mild climate makes a screen room one of the most-used additions in the area. San Lorenzo homeowners who want to enjoy the backyard without insects or direct afternoon sun get a lot of use out of a screened porch, especially during the long dry season from May through October when outdoor entertaining is easy if the space is comfortable.
Some San Lorenzo homes have older enclosed spaces added without permits or built with materials that have not held up well. Remodeling brings these rooms up to current code, replaces deteriorated framing and glazing, and addresses any water intrusion issues that have developed since the original unpermitted enclosure was built.
San Lorenzo is almost entirely postwar housing. Developer David Bohannon built most of the neighborhood between 1944 and the mid-1950s, and the homes he put up - small, single-story, slab-on-grade - are now over 70 years old. Original concrete patios and foundations have been through seven decades of East Bay winters and dry summers. The clay-heavy soils under most San Lorenzo lots expand when they absorb winter rain and shrink again as the ground dries out in summer. That repeated cycle pushes and pulls on slabs, framing, and anything attached to the house. Before any new enclosure work starts, a good contractor checks what 70-plus years of soil movement has already done to the existing structure.
San Lorenzo is also an unincorporated community, which means permits go through Alameda County Building Services rather than a city building department. The county process is not more difficult, but it is different from what a contractor used to pulling permits in incorporated East Bay cities will expect. Properties near San Lorenzo Creek carry an additional layer of review: homes in or near the FEMA flood zone may face elevation requirements for any new enclosed floor space, and Alameda County Flood Control has jurisdiction over work near the creek corridor. These are manageable requirements if you know them in advance, and they are surprises if you do not.
Our crew works throughout San Lorenzo regularly, and we understand the local conditions that affect sunroom and patio enclosure work here. We pull permits through Alameda County Building Services and know how the county plan check process works for enclosed additions on unincorporated East Bay properties, which is a different path than pulling permits in Hayward or San Leandro even though they share the same ZIP codes on some streets.
San Lorenzo Village, the original Bohannon development, is the core of this community. The streets here are laid out on a grid with modest lot sizes and homes that sit close to the street, which means setbacks and property lines need attention early in the design process. Homes closer to the industrial corridor along Hesperian Boulevard have different lot configurations than the residential streets deeper in the Village. We have worked throughout San Lorenzo and understand the practical differences from block to block.
We regularly serve homeowners in Castro Valley to the east and in Hayward immediately to the south, so we know this stretch of the East Bay well.
Reach us by phone or through the contact form and we will get back to you within one business day. We schedule a no-obligation site visit at a time that works for you - you do not need to have a detailed plan ready before you call.
We visit your home, assess the existing patio slab, foundation, and drainage, and check the county flood zone status for your parcel. You get a written estimate that covers materials, labor, and permit fees - no hidden items added later. This is also where we talk through design options and any soil or drainage factors that affect the build.
We submit the permit application to Alameda County and begin construction after plan check approval. Most patio enclosures on existing slabs take two to four weeks of active construction. You do not need to be home during the work, but we keep you informed at each stage.
We schedule and pass the Alameda County final inspection before the project closes. You receive a copy of the closed permit, which stays on record with the county and documents the addition properly for resale and insurance purposes.
We serve San Lorenzo homeowners throughout the community - from San Lorenzo Village to the streets near Hayward. No-obligation estimate, written quote, and we handle the Alameda County permit.
(510) 738-1709San Lorenzo is an unincorporated community of roughly 26,000 to 28,000 residents in Alameda County, tucked between San Leandro to the north and Hayward to the south along the East Bay shoreline. Most of the community was developed by builder David Bohannon starting in 1944, making it one of the earlier large-scale postwar suburbs in the Bay Area. The result is a neighborhood of compact, single-story homes on a regular street grid - modest in size but well-established, with deep roots in the community. According to the history of San Lorenzo, the Bohannon development was planned as a complete community with schools, parks, and shopping, and that original character is still recognizable today.
San Lorenzo Creek runs through the community before emptying into San Francisco Bay, and the areas near the creek are a reference point most residents know well. The community sits along Interstate 880, which makes it a practical base for commuters heading to Oakland or San Jose. Housing here is a mix of owner-occupied and rental properties, with a high concentration of long-term residents who take genuine pride in their homes. Nearby communities include San Leandro to the north, known for its Estudillo district and older bungalows, and Hayward to the south, a larger city with its own mix of flatland and hillside neighborhoods.
Expand your living space with a beautiful, professionally built sunroom addition.
Learn MoreRefresh and modernize your existing sunroom with professional remodeling.
Learn MoreConvert your existing patio into a comfortable enclosed sunroom.
Learn MoreWe know these Bohannon-era homes, we know Alameda County's permit process, and we are ready to give you an honest written quote. Call today or submit the form - we respond within one business day.