The door is the part of the greenhouse you touch every single day, so it's worth getting right. On a Janssens greenhouse you've got two main paths — sliding or hinged — and they differ in look, in how hard they are to install, and in how well they suit things like a knee wall. Here's the honest comparison.
Sliding or hinged greenhouse doors — what's the difference?
Sliding doors are the standard, easier-to-install option; hinged doors are a handsome upgrade that's significantly harder to fit. Sliding doors glide along the outside of the frame on brush weatherstripping and come single or double. Hinged doors inset into the frame with rubber gaskets and adjustable hinges, open a full 180°, and look more like a traditional house door — but they take real skill to install.
That's the trade in one sentence: sliding is simpler and more forgiving, hinged is more beautiful and more work. Which is right depends on your build, your site, and how much installation effort you want to take on.
How do sliding greenhouse doors work?
Sliding doors slide along the outside of the greenhouse with brush weatherstripping sealing the gap, and they come as single or double. They have keyed locks at the bottom, and the double version has no center support, so you get a wide, clear opening to move plants, carts, and benches through.
The standard setup uses the 4½" base frame as the threshold — a small step up as you walk in. If that step is a concern, there's a fix, which brings us to thresholds.
What is the Low Threshold Kit?
The Low Threshold Kit cuts the base frame down to a 1" threshold for an easier, near-flush walk-in — better for carts, wheelbarrows, and anyone who'd rather not step over a 4½" lip. It's available for single or double sliding doors.
One important limit: because the kit cuts into the base frame, it needs a continuous, supporting foundation underneath. If your greenhouse is anchored only at the four corners rather than on a full strip foundation, don't add a low threshold — the cut section won't be properly supported. It's a great upgrade on a proper strip foundation, and one to skip on corner anchoring.
When should you choose hinged doors?
Choose hinged doors when you want the upgraded look and a full 180° swing, and either you're comfortable with a harder install or you'll bring in a skilled hand for that piece. They're genuinely handsome — but be realistic: they're significantly more challenging to install, may require a grinder, and we recommend a skilled handyman for them. Our DIY vs. contractor guide covers that split.
Two things make hinged doors especially worth it:
- On a knee wall, hinged is the strong recommendation. If you're placing a ground-mount greenhouse on a knee or stem wall, hinged doors are more forgiving of capstone and veneer, open a full 180°, and skip the awkward top-rail mounting workaround that sliding doors need in that situation.
- They're best ordered with the greenhouse. Freight-shipping hinged doors later is often cost-prohibitive, so decide up front. That's a real money point, not a sales nudge.
A note on knee walls and the Drop Door Kit
If you're setting a greenhouse on a knee or stem wall, you'll also want to know about the Drop Door Kit, which adapts the door for that raised placement. Two details buyers need to hear clearly:
- It's hardware only — it does not include the glazing above the door. That pane is a custom size you source locally as 3/16" or ¼" tempered safety glass, 28¾" wide.
- The standard kit accommodates a knee wall up to 30" tall. Taller walls need extra material specified at the time you order.
And the recurring rule that touches every glass decision: tempered glass cannot be cut — it shatters. So that above-door pane must be ordered to size, never trimmed to fit. If you're weighing a knee wall, call us first — it's the kind of setup where a five-minute conversation prevents an expensive mistake.
Will a door screen work with my setup?
If you want to keep bugs out with the door open, a door fly screen is available — but it slides on the inside, which means it's not compatible with hinged-door auto-closers or with units placed against a wall. Worth confirming your configuration early if a screen matters to you. (More in our ventilation guide.)
The quick decision
| Choose sliding if… | Choose hinged if… |
|---|---|
| You want the simpler install | You want the upgraded look and 180° swing |
| You're building on a standard foundation | You're building on a knee or stem wall |
| You'd like the Low Threshold Kit option | You'll order with the greenhouse and hire the door out if needed |
One last note for anyone drawn to the traditional look: the Retro Victorian ships with hinged double doors and push-out windows as standard, if you'd rather have that configuration built in from the start.
Not sure which door fits your build? Call us or reach out anytime. Tell us about your foundation, whether there's a knee wall, and how you'll use the space, and we'll steer you to the door that's right — and make sure anything freight-shipped goes on the original order to save you money.