How to Measure Your Space for a Walk-In Cooler or Freezer

By Renato J. Alonso, Founder and President, Qube Cold Storage Solutions · Updated October 28, 2026

Measure the space, not the box you want: length, width and clear height to the lowest thing overhead. Then measure the path the panels take to get there. Send us those numbers with photos, and we size the box to fit and send a dimensioned drawing for your approval before anything is built.

The five measurements we need

#	Measure	How	Why it matters
1	Length of the space	Wall to wall, at the floor and again at 6′ high	Walls are rarely straight. We use the smaller number.
2	Width of the space	Same way, at both ends	Same reason.
3	Clear height	Floor to the lowest beam, pipe, duct, sprinkler head or light	The box, and the room to set the ceiling panels, has to fit under it.
4	Door wall and position	Which wall the door goes on, and which side the hinges go	Walk-in doors swing out. They need clear floor space for the full swing.
5	The path in	Every door, hallway, corner and elevator between the truck and the space	Long panels, as long as the room is wide or long, have to make it through.

Also tell us: where the condensing unit (the outdoor half of the refrigeration) can go, whether roof, outside wall or inside; the electrical service at the building (see our article on walk-in electrical); and whether the floor is a concrete slab.

Inside size vs outside size

Walk-in sizes are quoted as nominal outside sizes. With standard 4″ panels:

To get	Do this
Inside length and width	Outside minus 8″ (a 4″ wall on each side)
Inside height, floorless box	Outside height minus 4″ (the ceiling)
Inside height, box with insulated floor	Outside height minus 8″ (ceiling and floor)

Example: a standard 7′-7″ box is 7′-3″ tall inside without a floor and 6′-11″ with one. Our built sizes run a few inches under nominal, never over. The drawing that comes with your quote shows the exact numbers.

Write it so nobody can misread it

Most sizing problems are not bad measurements. They are good measurements written in a way someone can misread.

• Use feet and inches with the marks: 7′-7″, not 7.7 or 91. A height written as 91 can be read as 9′-1″ when it means 91 inches, which is 7′-7″. That is an 18″ difference.
• Say which number is which. "8 x 20" and "20 x 8" both show up in the same request. Write "8′ wide (door wall) x 20′ long".
• Say inside or outside. If you are fitting shelving or a pallet, you probably care about inside. If you are fitting a room, you care about outside.
• For a cooler/freezer combination, give each room's size and the overall size. If they don't add up, we go with the overall size and ask you. See combination walk-ins.
• Add photos. One from each corner of the space, one of the ceiling, and one of the route in.

Common traps

• Sprinkler heads and ductwork. Clear height is to the lowest item, not the ceiling deck.
• Out-of-level floors. A floorless box sits on your concrete. If the floor drops toward a drain, measure the height at the high point and tell us how much it falls.
• The door swing. Leave room in front of the door for it to open fully and for a person with a rack to get through.
• Getting panels in. Panels arrive on long, flat pallets. A narrow hallway with a tight turn can stop a 10′ or 12′ panel even when the room itself is big enough.
• Self-contained (top-mount) refrigeration sits on top of the box. It needs extra height above the ceiling for the unit, its airflow and service space. Tell us if that is the plan. See self-contained vs remote refrigeration.

From the field

Heights reach us written as "91" more often than you would think. Read as 9′-1″ instead of 91 inches (7′-7″), that is 18″ on every wall panel. That is why we ask for feet and inches with the marks, and why every quote comes with a dimensioned drawing you approve before anything is built. If a number on the drawing looks wrong to you, it gets fixed on paper, not on site.

Questions people ask

Should I measure inside or outside?

Measure the space where the walk-in will sit. We work out the box and show both inside and outside sizes on the drawing.

How much room do I leave around the box?

Your installer and local code set that, especially around the condensing unit. Give us the space and tell us what your installer needs.

What if my space is an odd shape?

We build L-shapes and multi-room layouts. Send a sketch with every wall length.

Can you work from a sketch on paper?

Yes. A clear photo of a hand sketch with numbers and units is enough to start.