How to Measure Your Coop for an Automatic Chicken Door
Before you buy an automatic chicken coop door, measure three things: the opening your birds walk through, the flat wall the frame mounts on, and the space the door panel moves into when it opens. The third one is the measurement most people miss. On a door whose panel slides up, like our T1 and S1, the frame is only 13 inches tall, but you need 22.3 inches of clear, flat wall measured from the bottom of the opening.
Why the frame size is not the number that matters
Most automatic coop doors work like a small guillotine in reverse. The panel sits in front of the opening when the door is closed, and when it opens, it slides up and past the top of the frame. So the space the door needs is the frame plus the travel of the panel above it.
That is why our product pages list three numbers, not one. For the T1 and S1, the door opening is 8.3 x 10 in, the frame is 9.6 x 13 in, and the clearance needed is 22.3 in of total height. If you measure only the frame, you will come up about 9 inches short.
Side-sliding doors flip the problem around. Our SL1 slides its panel to the right instead of up, so it needs no extra height, but it needs 23.3 in of flat wall width in total.
How to measure your coop for an automatic door, step by step
You need a tape measure, a pencil and a few minutes in daylight.
- Measure the opening your birds use now. Width and height, inside edge to inside edge. Compare it with the door opening of the model you are looking at, not with the frame size.
- Mark the bottom edge of the opening. This is where every height measurement starts. Not the ground, not the coop floor. The product pages give the clearance as clear flat wall above the floor of the opening.
- Measure straight up to the first obstacle. A roof overhang, eave, window, vent, hinge, trim board or nest box hatch all count. Write down the shortest distance you find across the width of the frame.
- Measure the flat width on both sides. The frame needs flat wall to sit on. A side-sliding door also needs room on the side the panel travels to.
- Check what you are screwing into. The frame needs solid wood. A door mounted on soft or rotten boards is a weak point, no matter how good the door is.
- Plan the power and the signal. On a solar door, decide where the panel goes. On a door with app or wireless control, check that the signal reaches the coop.
- Look inside, too. If you run deep litter, UF/IFAS Extension suggests building the bedding up to 12 inches over time. A threshold at floor level ends up below that. More in our guide to the deep litter method.
💡 Pro tip: Hold the tape vertically from the mark and pencil a line at the clearance height of the door you are considering. If the line hits the roof, a window or a hatch, you know before you order, not after.
The numbers for each RoostGuard door
All figures are from our product pages.
| Door | Panel opens | Door opening | Frame or unit size | Space you need |
|---|---|---|---|---|
| T1 Timer | Up | 8.3 x 10 in | 9.6 x 13 in | 22.3 in of height from the bottom of the opening |
| S1 Solar | Up | 8.3 x 10 in | 9.6 x 13 in | 22.3 in of height, plus a spot for the solar panel within its 9.8 ft cable |
| XL Solar | Up | 9.4 x 11.4 in | 10.6 x 13.8 in | 25.2 in of height from the bottom of the opening |
| W1 Wireless | Up | 9.45 x 10.9 in | 11.3 x 14.3 in unit | Flat wall above the frame for the panel to rise. Ask us for the exact height before you order. |
| SL1 Slide | To the right | 10.0 x 9.9 in | 13.4 x 12.2 in unit, closed | 23.3 in of total wall width |
Which door size for which birds?
Our standard T1 and S1 doors have an 8.3 x 10 in opening. The XL opens to 9.4 x 11.4 in and is sized for ducks and heavy chicken breeds such as Brahma, Jersey Giant, Orpington and Cochin. The W1's 9.45 in wide opening suits chickens and ducks.
None of our doors is large enough for geese or turkeys. If you keep them, this is not the door for that coop, and we would rather tell you now.
Common measuring mistakes
- Measuring the frame instead of the full travel. The most common one. A 13 in frame on an upward-sliding door still needs 22.3 in.
- Measuring from the ground. Coops on legs or with a raised floor make this easy to get wrong. Start at the bottom edge of the opening.
- Forgetting the roof line. A low roof overhang above the pop hole is the classic reason an upward door does not fit. That is the situation the side-sliding SL1 is built for.
- Forgetting the solar panel. On the S1 the panel connects with a 9.8 ft cable, so it needs a sunny spot within that distance, above or beside the door.
- Assuming Wi-Fi reaches the coop. App control on the SL1 needs a Wi-Fi signal at the coop. Without it, the timer, light sensor and buttons still work.
- Trusting the remote range on paper. The W1's control panel is rated up to 460 ft in open line of sight by the manufacturer. Walls and trees shorten that.
What if there is no room above the pop hole?
You have three options. Move the opening lower or to a wall with more height, which is real carpentry. Choose a door that slides sideways, if you have the width: the SL1 needs 23.3 in of flat wall in total, with the panel sliding to the right. Or leave the door manual. An automatic door that does not fit properly is worse than none, because you will trust it.
Not sure an automatic door is worth it for your setup at all? We wrote an honest look at whether automatic coop doors actually work, and a comparison of timer vs light sensor doors.
FAQ
How much space do I need above my coop door for an automatic door?
It depends on the door. Upward-sliding doors need the frame height plus the travel of the panel. Our T1 and S1 need 22.3 in of clear flat wall measured from the bottom of the opening, and our XL needs 25.2 in.
Do I measure from the ground or from the opening?
From the bottom edge of the opening. That is where the clearance figure on our product pages starts.
What if my coop has a low roof above the pop hole?
Look at a side-sliding door. It needs width instead of height: our SL1 needs 23.3 in of flat wall in total and no extra space above the frame.
How big should a chicken coop door opening be?
Our standard doors open 8.3 x 10 in. For ducks and heavy breeds like Brahmas and Jersey Giants, our XL opens 9.4 x 11.4 in. None of our doors is large enough for geese or turkeys.
Do I need to adjust a timer door during the year?
Yes. In timer mode, reset the open and close times a few times per season as daylight shifts. A light sensor door follows daylight on its own.
Once you have your three numbers, compare them with the specs on each door in our automatic coop doors collection. If something does not add up, send us your measurements before you order and we will tell you honestly whether it fits.
Sources
- RoostGuard product pages: T1 Timer Door, S1 Solar Door, XL Solar Door, W1 Wireless Door, SL1 Slide Door
- Litter Management for Home Flocks, UF/IFAS Extension Baker County
