The windows in this Cupertino home are a defining feature, with dual-pane glass throughout and especially large openings in the family room, where wide sliding doors open directly onto a covered patio. The office, by contrast, is the one room where the household has noted a need for more daylight. My plan for this South Stelling Road project is shaped by the specific rooms and surfaces of this 2026-built, two-story house: every window decision starts with the actual light, privacy, and views in each space, not a generic approach.
This house sits on a flat, flag lot of 11,068 square feet, with a modern stucco exterior, composition roof, and a concrete perimeter and slab foundation. The main structure is about 4,073 square feet, with six bedrooms and five and a half baths. The living spaces feature wide-plank oak floors, and the open-concept kitchen and family room are already visually and physically connected by those large sliding doors. The family room’s wide glass opening is the heart of the indoor-outdoor flow, and the covered patio it faces is both a functional extension of the living space and a cue for how the rest of the house should relate to the outdoors.
The family room’s sliding doors are already sized to maximize connection to the covered patio. I would keep this opening exactly as it is, since it is the clearest link between the interior and the backyard, and the flag lot and fenced back give this area a unique privacy compared to many Cupertino homes. The patio’s covered roof allows for year-round use in Cupertino’s mild climate, and the drought-tolerant landscaping outside supports that use without the glare or heat gain that might come from bare paving. Where privacy is a concern, perhaps at the sides of the patio, where neighboring structures could have a view, I recommend adding discreet screening or planting, but only where it does not block the daylight or the sense of openness that the sliding doors provide.
The office, on the other hand, needs a more targeted solution. The room is already designated as a dedicated workspace, but the current window configuration does not bring in enough natural light. Here, the choice is between enlarging an existing window or adding a new one. The decision depends on which wall offers the best view and how the desk and work area are arranged. I would first test the daylight at the intended work surface. If an existing window on the office’s exterior wall can be replaced with a larger unit without disrupting the clean stucco lines, that is the simplest solution. If not, a new window should be sized and placed to align with the home’s modern exterior and avoid creating an awkward or piecemeal look. The goal is to make the office as usable as possible for the household, while respecting the architectural rhythm set by the rest of the house.
Elsewhere in the house, the dual-pane windows already installed provide good thermal performance, which is important for a home with central forced-air heating and cooling. The large windows in the living room and bedrooms should be evaluated for their orientation and the amount of direct sun they receive, especially since the lot has minimal slope and no large trees for shade. Where summer heat gain could be an issue, especially given the recorded 8 days above 93° this year, and more in the future, I recommend adding shading elements, such as exterior shades or interior treatments, but only for those windows that actually need it. The wide-plank oak floors and floating vanities in the bathrooms are best complemented by window trim and finishes that continue the home’s modern, minimal palette.
The foundation and exterior wall construction, concrete perimeter and slab with stucco finish, mean that any new or enlarged window must be carefully integrated into the existing envelope. The absence of a basement and the presence of an attached two-car garage and carport also shape how new windows will be experienced from the entry approaches. For example, if a mudroom or drop zone is added near the garage entry, a window there could bring in light and create a welcoming transition, but it should be sized and placed to maintain privacy and security.
Since Cupertino suspended enforcement of its all-electric building ordinance in May 2024, any changes to the home’s systems that might be triggered by window work, such as electrical or HVAC adjustments, should be checked against the most current city requirements before work begins. (City of Cupertino, All-Electric Building)
This house does not fall under any historic-preservation review, as Cupertino has no such ordinance or inventory, so interior window changes are not subject to additional approvals. The lot’s soil, classified as Urban land-Flaskan complex with 0 to 2 percent slopes and hydrologic group D, supports the current slab foundation and landscaping choices, and does not present special drainage or stability challenges for new window openings.
If your home in Cupertino has a similar mix of expansive glass and one or two rooms that stay dim, I invite you to reach out. Together, we can look at your house’s specific rooms, surfaces, and site to create a window plan that truly fits your household’s needs.
