The modern appeal of cantilevered stairs
Cantilevered stairs, or floating stairs, have become a staple of modern interior design. They rely on treads that seem to float because they are secured to a wall at only one end, with no stringer or support on the other side. A stair runner on this type of staircase can look amazing, softening the minimalist look while providing a much-needed touch of warmth underfoot. However, because the structure is so exposed, how you fit the runner is crucial—every edge, staple, and join is visible from multiple angles.
Fitting techniques for a cantilevered flight
The most common way to fit a runner on cantilevered stairs is the 'individual tread wrap'. You don't run one long piece of carpet continuously; instead, you cut individual pieces for each tread, wrapping them around the front and the underside. This is the only way to avoid having a huge, bulky runner sagging between steps. Each piece needs to be meticulously measured, cut, and stapled on the underside. Since the underside is also visible, the staples must be carefully placed and hidden or covered with a neat binding strip.
How much runner do I need?
Since you are wrapping each tread individually, you aren't doing a standard continuous-run calculation. Measure the depth of the tread, the thickness of the tread, and the amount you want to wrap under. A typical tread is 11 in (28 cm) deep and 4 in (10 cm) thick; if you wrap 3 in (8 cm) under, that's 18 in (46 cm) per tread. For 13 treads, that's 234 in (19.5 ft) plus a 15% waste allowance for matching patterns, bringing you to roughly 22.5 ft (6.8 m).
| Measurement | Imperial (in) | Metric (cm) |
|---|---|---|
| Tread depth | 11 in | 28 cm |
| Tread thickness | 4 in | 10 cm |
| Underside wrap | 3 in | 8 cm |
| Per-tread total | 18 in | 46 cm |
| 13-step total (incl waste) | 22.5 ft | 6.8 m |
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 calculatorFor any stair project, using the stair runner calculator is a smart move. It ensures your math is sound before you cut a single inch of expensive material. If you need help finding the best options, look for stair runner carpet that has a flexible, high-quality backing.
- Wrap each tread individually for a crisp look.
- Use strong adhesive or hidden staples to secure the underside wrap.
- Consider adding an edge binding to the runner to prevent fraying on the exposed sides.
- Check your building codes—some regulations require a minimum width or non-slip finish on floating stairs.
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
Can you fit a continuous runner on cantilevered stairs?
It is not recommended, as it will sag between the floating treads and look bulky.
How do I hide the staples on floating stairs?
Use hidden fixings, staple on the underside, or use a matching binding strip to cover the edge where the runner wraps under.
Are cantilevered stairs safe with a runner?
Yes, a runner adds traction, but it must be fitted taut and securely to ensure it does not create a slip hazard.
What is the best runner style for cantilevered stairs?
A tailored, low-profile runner or individual tread covers work best to maintain the clean lines of the floating design.
Do I need special underlay?
Thin, dense underlay is ideal to provide comfort without increasing the thickness of the runner too much.
Can I do this job myself?
It is an advanced DIY project; professional fitting is often preferred for floating stairs to ensure a flawless finish.
What should I look for in a runner material?
Something durable and easy to wrap without creasing or cracking, like a high-quality wool-synthetic blend.
Is the underside of the stair important?
Yes, because cantilevered stairs are often visible from below, the fit on the underside is as important as the top.
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.
Calculate your cantilevered runner needsEvery 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.