Three little measurements are all it takes to turn the space under your stairs into a child's secret den. Grab a tape measure — here's exactly what to jot down.
1
What you'll need
A tape measure
A pen
Five quiet minutes
Work in centimetres, and measure each one twice — stairs are rarely perfectly square, and a second look saves fabric later.
2
The three measurements
measure to the stair string — the sloped board the curtain fixes to
AOpening widthStraight across the floor, from the tall wall to the far side of the opening.
BTall sideThe full height on the tall side — floor up to the string where the curtain will fix.
CShort sideThe height at the low end. Often this is 0 (the stairs meet the floor) — if so, just write 0.
3
A few tips for a perfect fit
Measure to the string — the sloped wooden board under the bannister — not to the step edges. That's where the Velcro grips.
If the floor or skirting is uneven, measure at a few points and use the smallest opening width.
Note which side is tall — most under-stairs slope down one way. The curtain's room colour faces out either way.
Your measurements
Write them here, then pop them straight into the pattern — it does the cutting maths for you.
A · opening widthcm
B · tall sidecm
C · short sidecm
What's next — let the pattern do the maths
Got your three numbers? That's all you measure — the pattern does the rest. Enter A, B and C and it works out your exact panels, adds the 5cm Velcro band and the seam allowances, sorts the mirrored cutting, and tells you precisely how much fabric and Velcro to buy. No guesswork, and nothing to add yourself — measure the opening as it is, and cut to its numbers. A hideaway of their own, on its way.