08/06/2026
Roller Door Sizes Explained🎓
When planning a shed, it is common to say:
“I need a 3-metre-high roller door.”
But there are a few different measurements involved, and they are not all the same thing.
A lot of shed companies will give nominal door sizes ( a hopeful estimate) or curtain size, that may change during construction, simply because their design software is not advanced enough to calculate the exact opening size during the design phase.
At Spartan Sheds, our advanced design software allows us to guarantee clear opening heights and widths.
Let me explain ⏬️
1️⃣ Opening Size
This is the clear structural opening in the wall of the shed - the space the vehicle, trailer or machinery needs to pass through.
Often refered to as daylight opening, in the industry.
2️⃣ Door Curtain Size
The roller door itself is made larger than the opening so that it overlaps and seals correctly against the opening and tracks.
For example, Taurean’s windlocked roller doors are 100mm wider than the daylight opening required. This allows the width needed to run the door in the side tracks.
3️⃣ Headroom and Side Room
A roller door also needs physical space⤵️
✅️ Above the opening for the rolled-up curtain, brackets and hardware
✅️ Beside the opening for guides, brackets and, where applicable, motor clearance
✅️ Behind the opening for the door roll and mounting arrangement
This is why the shed wall height, opening height and usable drive-through clearance all need to be considered together.
Why this matters⏬️
If someone wants to comfortably drive a caravan, excavator, boat tower or tall machinery into a shed, it is not enough to simply nominate a door size and hope it all comes together, as so many do.
The correct question is⏬️
“What clear opening and usable access height do I actually need?”
From there, the shed wall height, framing and door selection can be designed to accommodate the door size required.
At Spartan Sheds - we guarantee clear, daylight opening sizes, right from the start.
Spartan Sheds — Simply…Better Sheds.