Stairs by floor height · 2.55 m · Straight

Straight stairs for a 2.55 m floor height

15 risers of 17 cm and 14 treads 29 cm deep, at 30°. 1.00 m wide, it takes 1.00 m × 4.06 m of floor. It is 4.06 m long and needs an opening of 3.75 m in the floor above for 2 m clear over every nosing.

Open this stair in uCAD What it’s made of

15risers

17 cmeach riser

29 cmgoing (tread depth)

14treads (the last riser is up to the floor)

30°pitch

1.00 m × 4.06 mfootprint, over the treads

The plan: steps numbered from the bottom, the walking line in blue.

More or fewer steps

2.55 m (255 cm) can be climbed in fewer, higher steps or more, lower ones. Each opens in uCAD as this stair with that many risers.

Risers	Each riser	Going	Pitch	Run of a straight flight	How it walks	In uCAD
13	19.6 cm	25 cm	38°	3.00 m	steeper, fewer steps	open
14	18.2 cm	27 cm	34°	3.51 m	comfortable	open
15	17 cm	29 cm	30°	4.06 m	comfortable (drawn here)	open
16	15.9 cm	31 cm	27°	4.65 m	comfortable	open

Limits differ by country: England’s Approved Document K allows a rise up to 220 mm and a pitch up to 42° in a home, Germany’s DIN 18065 up to 200 mm, and both ask for 2.0 m of headroom. Check the code that applies to yours.

What it’s made of

Drawn as it’s built, in timber with open treads: treads housed in the stringers, posts under the turns, a railing on its newels. 292 parts in all, every bolt and weld among them. Sizes in millimetres, length × width × thickness.

Part	Qty	Length	Width	Thickness
stringer (shaped)	2	4638	263	50
tread	12	1030	315	40
tread (shaped)	2	1030	315	40
handrail, round 50 mm (shaped)	2	4544	49	49
post, timber 90x90	2	1363	90	90
post, timber 90x90	2	1181	90	90
baluster, steel square bar 18 mm (shaped)	60	846	18	18

Fixings: 4 × tie rod M10x1127, 32 × washer M10, 24 × nut M10, 60 × stud M8x80, glued, 60 × screw 5x45, 2 × bracket, concealed post base 90, 4 × anchor bolt M10x100, 4 × stud M10x117, 4 × anchor bolt M10x200, 8 × bolt M10x170, 8 × nut M10, barrel.

Closed risers, a steel frame, another width or railing: change it in uCAD, and the parts are worked out again, with a cut list of the boards to buy. Sizes of the structure are the library’s defaults for a house stair, not an engineer’s calculation for yours.

Another height or width

Straight stairs for 2.55 m in 3D, between its floor and the floor above — This stair in 3D, between its floor and the floor above.

Will it fit your room?

Open it in uCAD, draw your walls round it and look: turn it the other way, move the turn up or down, change the width. Or tell the AI: “a stair for 2.55 m in a 2 × 3 m stairwell”, and it draws one that fits.

Open this stair in uCAD

Same height: L-shaped, landing · L-shaped, winders · U-shaped, landing · U-shaped, winders · Spiral · Square spiral
This stair for 2.50 m · 2.60 m · all heights