Why a spec sheet matters
Suppliers cutting to order cannot see your stairs, so anything you leave ambiguous gets filled in with a default assumption that may not match your flight. A written spec sheet removes guesswork on both sides and gives you a record to check the delivered runner against.
The core measurements to include
| Field | Example value | Why it matters |
|---|---|---|
| Number of steps | 13 | Base unit for length calculation |
| Tread depth | 10 in (25 cm) | Per-step length contribution |
| Riser height | 7.5 in (19 cm) | Per-step length contribution |
| Stair width | 36 in (91 cm) | Determines runner width choice |
| Landing or turn present? | Yes, half landing | Adds length and pattern-matching complexity |
| Top and bottom finish | Waterfall top, tucked bottom | Affects total length needed |
Know your numbers in 30 seconds
Enter your step count, tread depth and riser height — the stair runner calculator gives you the exact length to order, in metres and feet, with waste included.
Open the stair runner calculatorMaterial and pattern details
- Material and pile type (wool cut pile, sisal, flatweave, etc).
- Colour name and reference number from the supplier's range.
- Pattern repeat size if applicable, and which direction it should run.
- Border or edge binding colour if different from the main field.
Fixing method and hardware
| Fixing method | What to specify |
|---|---|
| Stair rods | Rod width, finish, quantity, bracket vs pole-and-socket |
| Staples/tackless strip | Whether the fitter supplies or you do |
| Hollywood vs waterfall | State your preferred method explicitly |
| Runner over existing carpet | Flag this so staple length can be advised |
Waste allowance and cut length
Ask the supplier to confirm the cut length including their standard waste allowance, typically 8-12% for a straight flight and more for a flight with a turn. Cross-check their figure with your own stair runner length calculator result before approving the order; a mismatch of more than 5% is worth querying before cutting begins.
| Scenario | Typical waste allowance |
|---|---|
| Straight flight, plain material | 8-10% |
| Straight flight, patterned repeat | 10-12% |
| Flight with landing or turn | 12-18% |
| Curved or winder stairs | 15-25% |
Get everything in writing
Confirm the final spec, price and delivery date by email even if the order was placed by phone or in a showroom. This is your reference if the delivered runner does not match what was discussed.
Sample order checklist
- Request or confirm a physical sample before ordering full length.
- Send step count, tread depth, riser height and stair width.
- Specify material, colour reference and pattern repeat direction.
- State fixing method and any hardware needed.
- Confirm cut length, waste allowance, price and delivery date in writing.
Common ordering mistakes
| Mistake | Consequence | Fix |
|---|---|---|
| Measuring only total flight height, not per step | Wrong length ordered | Measure tread depth and riser height per step |
| Not specifying pattern direction | Pattern runs the wrong way when unrolled | State direction explicitly with a diagram if needed |
| Forgetting the landing or turn | Runner falls short | Include a note and rough sketch of any turns |
| Assuming standard width fits | Runner too wide or narrow for the stair | Measure stair width and choose accordingly |
Whatever you decide, get the numbers first: the stair runner calculator doubles as a stair runner length calculator, adding nosing wrap, landings, winders, pattern repeat and waste so you order the right length the first time.
Frequently asked questions
What is the minimum information a supplier needs to cut a runner?
Step count, tread depth, riser height, stair width, material and colour, plus whether the flight has a landing or turn. Missing any of these risks a poor fit.
Should I ask for extra length beyond the calculated total?
Yes, a waste allowance of 8-12% for a straight flight (more for turns) covers pattern matching, cutting errors and future re-tensioning.
Can I change my order after it has been cut?
Rarely without a fee, since custom-cut runners are usually non-returnable. Confirm every detail before approving the final cut.
Do I need to specify the fixing method when ordering the runner itself?
It is not essential for cutting the material, but flagging it helps the supplier or fitter advise on underlay, staple length or rod compatibility.
How do I check the delivered runner matches my order?
Compare the delivery note against your spec sheet for material, colour reference, width and length before installation begins.
Know your numbers in 30 seconds
Enter your step count, tread depth and riser height — the stair runner calculator gives you the exact length to order, in metres and feet, with waste included.
Build my order specEvery guide is written from hands-on measuring and fitting experience, checked against the calculator’s own maths, and re-reviewed whenever prices or methods change. Read our editorial standards.