Windows on an Enclosed Trailer: When to Add Them

A standard enclosed cargo trailer has no windows, and for hauling tools and equipment that is the right answer. But a trailer that people work inside, a concession trailer, a mobile office, a race trailer with a lounge, a pet grooming or detailing rig, is a different thing, and a couple of windows change it from a box into a room. Our options list includes windows and RV-style doors with screens; this post covers when they are worth it.

What a window gives you

• Daylight, which matters more than people expect when you are inside for hours.
• Ventilation, if the window opens, and cross-ventilation if there are two on opposite walls.
• A view out, which is a real thing for anyone selling from the trailer or working alone.
• A finished, occupied look that a windowless box never has.

What it costs you

Every window is a hole in a wall, and three things follow. Security drops, because a window is easier to break than a locked door and it shows what is inside. Wall strength drops slightly at the opening, though a factory-framed window on a standard trailer is not a structural concern. And the trailer gets hotter in summer, since glass lets in heat that an insulated wall would block. Tinted and shaded windows help with the last one.

Types

Fixed windows do not open and are the cheapest and most secure. Slider windows open for ventilation and usually include a screen. RV-style windows are the residential-looking kind with a proper frame and screen, and they pair with the RV doors on the options sheet: a 32-, 36- or 48-inch RV door with screen and window turns the side entry into something that looks like a home door. Concession windows, the large fold-up or slide-open serving windows, are a different category and covered in our concession conversion basics post.

Where to put them

Place windows where the work happens, not evenly along the wall. A window above a workbench lights the bench. A window in the side door lights the entry. Two windows on opposite walls, staggered, give cross ventilation. Keep windows away from the wheel-well area on a 7-wide, since the well eats the wall height there, and away from any wall where shelving or cabinets are going. Decide on the interior layout first, then the windows. Our post on cabinets and workbench buildouts explains the layout planning.

Tint, shades and heat

In South Georgia the sun is the main argument against a window, so plan for it. The radius windows on our options list come tinted, which cuts glare and hides the interior from a casual look, and it is the right default for any window on a working trailer. Inside, a simple roller shade or a fitted panel that slides over the opening lets you close the trailer up when it is parked, which matters for both heat and theft. If the trailer has a rooftop air conditioner, remember that every square foot of glass is heat the unit has to fight in July; two small windows placed where you work beat one large one placed for the look. Our post on roof vents, A/C and airflow covers how the ventilation package and the windows work together, and it is worth reading before you decide how many to order.

Which trailers should have windows

• Concession, vending and mobile retail: yes, plus the serving window.
• Mobile office, grooming, detailing and salon builds: yes, one or two with screens.
• Race trailers with a lounge or living area: yes in the living area, no in the car bay.
• Contractor, landscaping and equipment trailers: no. A window is a liability on a jobsite.
• Moving and storage trailers: no.

If the trailer is for a mobile business, the windows go in at build time with the rest of the interior. Tell us the layout during the custom build conversation and we will place them where they help.