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How much headroom do you need before a wardrobe can be tipped upright?

A wardrobe doesn't just need to be shorter than the ceiling — it needs room to be tipped upright. The wardrobe's diagonal is longer than its height, and it's the diagonal that decides whether it fits.

The maths: the diagonal, not the height

When a wardrobe is tipped up from lying flat to standing, it pivots on its rear bottom edge. As it comes up, the top rear edge sweeps upward in an arc, and the highest point on that arc is the wardrobe's diagonal, measured from back edge to front edge.

The formula is Pythagoras: diagonal = the square root of (height² + depth²).

• Wardrobe 2.00 m tall, 0.60 m deep: √(4.00 + 0.36) = 2.09 m
• Wardrobe 2.20 m tall, 0.60 m deep: √(4.84 + 0.36) = 2.28 m
• Wardrobe 2.40 m tall, 0.60 m deep: √(5.76 + 0.36) = 2.47 m
• Wardrobe 2.40 m tall, 0.40 m deep: √(5.76 + 0.16) = 2.43 m
• Wardrobe 2.60 m tall, 0.60 m deep: √(6.76 + 0.36) = 2.67 m

Notice the pattern: the deeper the wardrobe, the more extra height it needs to be tipped up. A deep wardrobe is harder to raise than a narrow bookcase of the same height. Add a further 2-3 cm for fingers, handles, and so you don't scrape the ceiling on the way up.

A concrete example: the room measures 2.443 m at its lowest point. The 2.40 × 0.60 m wardrobe needs 2.47 m plus a bit of clearance. It doesn't fit — even though the wardrobe is 4 cm shorter than the ceiling. This is the mistake most often discovered once the wardrobe is already sitting in flat-packed boxes in the living room.

Five ways round it, when the diagonal doesn't add up

1. Assemble the wardrobe standing up. Many flat-pack wardrobes can be assembled on site in an upright position, if the back panel is fitted last. Check the assembly instructions before you buy.
2. Tip it up on the diagonal in the room. If you raise the wardrobe at an angle — so it pivots on a diagonal at the base instead of a full edge — you gain a couple of centimetres of vertical clearance at the cost of more floor space. The gain is small, so it will rescue a missing centimetre or two, not a missing ten centimetres.
3. Trim the top back corner. A 3-4 cm chamfer on the top back corner is invisible once the wardrobe is standing against the wall, and it noticeably reduces the height you need.
4. Choose a wardrobe with the top panel as a separate piece. That way the carcass is raised lower, and the panel goes on afterwards.
5. Build lower and fill in with a row of upper cabinets. Two low units stacked on top of each other never need more room to raise than the taller of the two does.

Kitchen cabinets right up to the ceiling: measure the lowest height

Kitchens with upper cabinets running all the way to the ceiling are the job where an uneven ceiling hurts the most. The row of cabinets is built as a straight line; the ceiling in an older house rarely is.

The approach, when you're ordering:

• Measure the ceiling height along the whole kitchen wall — at both ends and a couple of points in between, not just in the middle.
• Build to the lowest of those measurements. If you build to the average, the cabinets at the low end won't fit, and the doors won't open.
• Plan for a filler strip or infill panel between the cabinets and the ceiling that can absorb the difference. With a 19 mm spread, the strip needs to be at least 3-4 cm high to look intentional.
• Also note whether there's a pipe boxing-in or a dropped section anywhere on the wall — it creates its own, lower height right there.

An example: the kitchen wall measures 2.462 m at one end and 2.443 m at the other. The row of cabinets is built to 2.443 m minus a tolerance, and the 19 mm difference is covered by the filler strip. Had it been built to 2.462 m, the row would have been 19 mm short at the low end.

Sliding doors and built-in wardrobes

Sliding door systems are fitted with a track in the ceiling and a track in the floor, and they come with an adjustment range, often on the order of 2-4 cm, where the door height can be fine-tuned on site. That makes them tolerant of a ceiling that slopes a little — but only within that range.

That's why the two figures a supplier asks for are exactly the lowest and the highest ceiling height in the opening the wardrobe is to fill. If the spread is greater than the system's adjustment range, either the ceiling or the floor has to be levelled first, or a levelling strip has to be fitted under the track.

At the same time, measure the width at three heights: down at the floor, in the middle, and up at the ceiling. Walls are just as rarely plumb as ceilings are level, and a wardrobe that's 4 mm too wide at the top won't slide in.

What HouseSense can give you — and what the tape measure has to

HouseSense gives you a measured floor plan with the room's internal measurements and areas, from a LiDAR scan or from a drawing you make yourself in the app. Those are the figures you need to work out whether there's room for the wardrobe on the wall at all, whether there's enough clearance in front of it, and whether the doors can open without hitting anything.

If you want to see a single wall at full height with its openings and measurements, the app folds the wall up as an elevation — the wall seen from the front — with a long press on it in the floor plan. It's the easiest way to see how much clear wall there is between a window and the ceiling.

The height measurements for the actual order still have to be taken with a tape measure or a laser: at least four points in the room, and along the whole wall the wardrobe will stand against. A model gives you one height per wall; the joiner needs your lowest measurement and the difference between the lowest and the highest. The drawing may be dressed up; the numbers may not.