Fitted to your opening
Floor-to-floor height, available length, stairwell: one click on Generate finds the best stair that really fits.
Your custom staircase, code-checked and ready to cut.
Enter your measurements. Stair3D finds the best stair for your opening, checks it against your building code and gives you the plans, the cut list and CNC-ready files.
- Checked against the building code
- DXF, STEP and Fusion 360 files
- Designed by stair builders
Your stair, checked
- Riser height7 1/2 in (191 mm)
- Going10 1/16 in (256 mm)
- Landing36 3/4 in (933 mm)
19 building code checks passed
Play with your stair
Turn it, explode it, see its structure in X-ray. Click a part to see its cut size.
39 parts · 13 risers · 97 1/2 in floor to floorDrag to turn · right-drag to pan · click, then scroll to zoom
Everything you need to get your stair right the first time
- Riser height6 × 7 1/2" 191 mm
- Going10 1/16" 256 mm
- Headroom86 1/2"
- Landing36 3/4"
- Guard height36"
- Handrail height36"
Code-compliant, rule by rule
Rise, going, headroom, landing, guards and handrails are checked, with the rule beside each value.
Every part, ready to cut
The cut list, a DXF per part for your saw or your CNC, a STEP model and a parametric Fusion 360 add-in.
The structure, explained
Stringers, landing joists, step boxes: you see what holds the stair up, not just what shows.
Who it is for
DIY builders
Clear plans and a cut list to build your stair yourself, without calculation mistakes.
Carpenters and contractors
A compliant stair in minutes, to show your client in 3D before you cut.
CNC shops, designers and architects
DXF and STEP files ready for the machine, and shapes you will not find anywhere else, like bleacher steps.
From your opening to the cut list
Measure what you have
Floor-to-floor height, stairwell length and width, and which walls are there.
Stair3D lays it out
Number of risers, going, landing and stringers: the best stair that fits, in seconds.
Check the code
Rise, going, headroom, guards and handrails are checked one by one, with the rule beside each value.
Build from the files
A cut list, a DXF for every part for your saw or your CNC, STEP for any CAD software, and a Fusion 360 add-in.
Code check today: Canada (National Building Code, Quebec Construction Code). Coming next: US International Residential Code, England Approved Document K, Australia National Construction Code.
What you download
Every part is drawn flat, ready to trace or to cut on a CNC. This is the upper cut stringer of the stair above.
- Cut list
- Every part with its quantity, material and finished size, ready for Excel.
- DXF per part
- Cut outlines, housings and mortises on separate layers. Opens in AutoCAD, VCarve, Fusion 360 and LibreCAD.
- STEP model
- The whole stair in 3D, one solid per part, for any CAD software.
- Fusion 360 add-in
- A parametric stair that rebuilds when you change a measurement.
Stair types
U-shaped with a landing
Available nowTwo flights side by side with a half landing. Four ways to build each flight.
Design my stairBleacher steps
Available nowEvery other step widens into a seat-deep platform. No other stair designer offers it.
Design my stairStraight
Coming nextA single flight, inside the house.
L-shaped
PlannedTwo flights at a right angle with a landing.
Free during launch
Design, check and download your files at no cost while we open Stair3D.
- Unlimited 3D stair designer
- Building code check
- Cut list, DXF, STEP and Fusion 360 add-in
Questions
Is it really free?
Yes, during the launch: the designer, the code check and the files. You get the download link by email.
Which building codes are checked?
Today, the National Building Code of Canada and the Quebec Construction Code. The US code (IRC), England’s Approved Document K and Australia’s National Construction Code are coming; our guides already give their rules.
Which files will I get?
A .zip with the cut list (CSV), a DXF for every part, all parts laid flat, the plan and elevation, a STEP model and a parametric Fusion 360 add-in.
Can I build from the plans as they are?
The plans are a reliable guide, but always check your measurements on site and the rules of your local authority before cutting.
Which stair types are available?
The U-shaped stair with a landing, with four ways to build each flight, including bleacher steps. The straight stair comes next, then the L-shaped stair.
Building code guides
The stair rules of each country, with the article numbers, in inches and millimetres.
- Canada Stair Code for Houses: NBC 2020 and Quebec
Canadian stair rules for houses under the NBC 2020 and Quebec code: 125–200 mm risers, 255–355 mm runs, 860 mm width, 1950 mm headroom, landings and guards.
- How to Calculate Stairs: Rise, Run and Landing
How to calculate stairs step by step: number of risers, riser height, run, the 2R + G rule, total run, stairwell opening and headroom, with a worked example.
- IRC Stair Code: Residential Stair Requirements (2021)
2021 IRC stair rules for homes: 7 3/4 in max riser, 10 in min tread, 36 in width, 6 ft 8 in headroom, 34–38 in handrails and guard rules, with section numbers.
- Stair Regulations Australia: NCC Rules for Houses
NCC stair rules for Australian houses: 115–190 mm risers, 240–355 mm goings, 2R+G of 550–700 mm, 865 mm stair barriers and the 125 mm sphere rule, with clauses.
- Staircase Regulations UK: Approved Document K for Homes
Domestic stair rules in England under Approved Document K: 220 mm max rise, 220 mm min going, 42° pitch, 2 m headroom, 900–1000 mm handrails, 900 mm guarding.
- U-Shaped Stairs with Landing: Dimensions and Plan
Plan U-shaped stairs with a landing: landing size by country, the void between the flights, headroom, stairwell opening, footprint and a worked example.