If you’ve ever walked into a store through two sets of doors with a small buffer space in between, you’ve used a vestibule without necessarily knowing the term for it. That same concept — a transitional, weather-buffered space — can also extend a home’s porch or patio into something usable across more of the year, not just the warm months.
At Phoenix Awning Company, we design and manufacture custom vestibules and enclosures for both homes and businesses across Philadelphia and the Delaware Valley. Below, we’ll cover what an entryway vestibule actually is, how residential and commercial versions differ, and what to think through before adding one to your property.
What Is an Entryway Vestibule or Enclosure?
An entryway vestibule is a small, enclosed transitional space between an exterior door and the interior of a building — commonly seen at commercial entrances, where it acts as an air lock that reduces drafts, heat loss, and energy waste every time the door opens. A broader enclosure applies the same idea to a larger area, like a porch or patio, using glass panels, screens, or retractable systems to turn an open-air space into a protected one.
Both serve the same core purpose: creating a buffer between the outdoors and the space you actually want to use, whether that’s a store entrance or a backyard patio you’d like to sit on in October.
Why Homeowners and Businesses Add One
Energy efficiency. A commercial vestibule significantly cuts the amount of conditioned air lost every time a door opens, which is why many energy codes require them on larger buildings. Residential enclosures offer a similar benefit by reducing wind and cold air reaching the home’s main entry points.
Weather buffering and extended use. For homeowners, enclosing a porch or patio with glass or screen panels means that space can be used in spring and fall — and in some cases winter — rather than sitting empty once temperatures drop.
Curb appeal and functionality. A well-designed vestibule or enclosure adds architectural interest while solving a practical problem, which is part of why they’re common on both upscale storefronts and custom home additions.
Protection from the elements. Beyond temperature, an enclosure keeps out wind, rain, and debris — useful for a business entrance that sees heavy foot traffic, or a home patio exposed to prevailing winds.
Materials & Structure Options
Vestibules and enclosures can be built a few different ways depending on the level of permanence and flexibility you want:
Framed glass enclosures offer full weather protection and a clean, permanent look — common for both commercial entrances and year-round home sunroom-style additions.
Screen or vinyl panel enclosures use retractable or removable panels, giving you the option to fully open the space in good weather and close it up when needed. These pair well with an existing patio cover or pergola.
Combined with an existing structure. In many residential projects, an enclosure isn’t a standalone build — it’s added to an existing awning, pergola, or covered patio, using the existing roof structure and adding walls or panels around the perimeter.
Residential vs. Commercial Vestibules
The two applications share a concept but differ significantly in execution.
Commercial vestibules are typically built to meet local energy code and ADA requirements, particularly around door spacing, clearances, and accessibility. They’re most common on retail storefronts, medical offices, and larger commercial buildings where foot traffic and energy loss are ongoing concerns.
Residential enclosures are less about code compliance and more about lifestyle — turning an existing porch, patio, or entryway into a usable, weather-protected space for more months of the year. These are often paired with our custom residential awnings or pergola installations rather than built as a separate structure.
If you’re a business owner considering a vestibule for an entrance, it’s worth pairing that conversation with our custom commercial awnings page, since the two are often designed together for a cohesive storefront look.
What to Consider Before Installing
Available space. Vestibules and enclosures need enough clearance to function properly — commercial vestibules in particular have minimum size and door-swing requirements.
Permits and code requirements. Commercial vestibules are often subject to energy code and accessibility requirements, and residential enclosures may require a permit depending on your township. This is worth confirming early in the process.
Climate and orientation. How exposed your entrance or patio is to wind, sun, and precipitation affects which materials and configuration make the most sense.
Budget and permanence. A fully framed glass enclosure is a bigger investment than a retractable screen or panel system, so it’s worth deciding upfront how much flexibility versus permanence you want.
Why Work with a Local, Custom Manufacturer
Vestibules and enclosures aren’t an off-the-shelf product — they need to be designed around your specific entrance, patio, or storefront, and in commercial cases, around code requirements that vary by township and building type. Phoenix Awning Company has been family-owned for over 42 years, and we manufacture our enclosures, awnings, and shade structures in-house, so your vestibule or enclosure is built to your exact space rather than adapted from a generic kit.
We design and install both residential and commercial projects throughout Philadelphia and the Delaware Valley, and we can walk you through whether a full enclosure, a retractable panel system, or an addition to your existing patio cover makes the most sense. See examples of completed projects in our awning gallery.
FAQs
What’s the difference between a vestibule and a full enclosure? A vestibule is typically a small transitional airlock space at an entrance, while a full enclosure covers a larger area, like an entire porch or patio, with walls or panels around the perimeter.
Do commercial vestibules have code requirements? Often, yes. Many energy codes require vestibules on commercial buildings above a certain size, and ADA guidelines govern door spacing and clearances. It’s worth checking your local requirements before finalizing a design.
Can an existing porch or patio be enclosed? Yes — this is one of the most common residential applications. An existing covered patio, porch, or pergola can often be enclosed with glass or screen panels without rebuilding the structure itself.
Are vestibules only for winter, or do they help in summer too? They help in both seasons. In winter, they reduce heat loss and drafts; in summer, they can reduce the amount of conditioned or cooled air lost every time a door opens or provide shade and wind protection on a patio.
How much does an entryway vestibule cost? Costs vary widely based on size, materials, and whether it’s a new structure or an addition to an existing one. A retractable panel enclosure is typically less expensive than a fully framed glass vestibule.
Can a vestibule be added to an existing awning structure? In many cases, yes — an existing awning or covered patio can serve as the roof for an enclosure, with walls or panels added around the sides rather than building a new structure from scratch.
Ready to Extend Your Space Year-Round?
Whether you’re looking to reduce energy loss at a business entrance or turn your patio into a space you can use in more seasons, the right solution depends on your specific layout. Schedule a free consultation with Phoenix Awning Company, and we’ll help you figure out what fits.