Stage one: measuring and ordering
Get the measuring right before you order anything, because a short-run material can leave you weeks waiting on a re-order that may not even match the original dye lot. Measure the going (tread depth) and rise (riser height) of every step individually if your stairs are older or slightly uneven - don't assume all steps are identical, especially in period homes where a builder's original layout can drift by half an inch or more over a flight.
Add the going and rise together for each step, sum the flight, then measure any additional landing wrap or turn separately. Confirm your chosen runner width against your stair's total width, leaving an even margin on both sides - most homes look best with a 3-6 in (7.5-15 cm) margin per side depending on stair width and banister style.
- Measure going and rise of every step, not just one and multiplying
- Add landing wrap or turn allowance separately from the straight-flight total
- Decide runner width and confirm even side margins at both top and bottom
- Add a 5-10% waste allowance for cutting error and pattern repeat
- Cross-check your hand measurement against the stair runner calculator before ordering
- Order underlay to match the final runner length, not the pre-waste figure
How much runner do I need?
As a worked example, a 13-step flight with a 10 in (25 cm) going and a 7.5 in (19 cm) rise needs 13 x 17.5 in = 227.5 in in US units, which is 18 ft 11.5 in, or 13 x 44 cm = 572 cm (5.72 m) in UK metric. With an 8% waste allowance for cutting and pattern matching, order around 20 ft 5 in in US units or 6.18 m in UK metric. If your flight includes a quarter or half landing turn, measure that section on its own and add it to the straight-run total rather than estimating.
| Checklist item | Target figure | Why it matters |
|---|---|---|
| Waste allowance | 5-10% over calculated length | Covers cutting error and pattern repeats |
| Side margin | 3-6 in / 7.5-15 cm each side | Keeps proportions even on the stair width |
| Underlay coverage | Every tread and riser, full width | Extends runner life and cushions impact |
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 calculatorRunning your step count and tread dimensions through the stair runner calculator on this site before you place an order is the quickest way to catch a measuring mistake while it still costs nothing to fix.
Stage two: tools and materials to have on hand
Nothing stalls a weekend installation faster than discovering halfway down the flight that you're out of staples or missing a bolster tool. Lay everything out before you start: your cut and bound runner, gripper strip cut to width, underlay pieces for every tread and riser, your staple gun or tack hammer with plenty of spare fixings, a bolster or stair tool, a knee kicker if you have one, a utility knife, and a tape measure for on-the-fly checks. The full stair-runner-installation-tools guide runs through what each tool does if you're assembling a kit from scratch.
Stage three: preparation and fixing checklist
- Strip back old carpet, tacks and staples to bare treads and check for loose boards or protruding nail heads
- Fit gripper strip at the top landing and bottom floor, pins angled towards the riser
- Cut and lay underlay on every tread and riser, securing lightly
- Position the runner at the top, check centring against both side margins before fixing anything
- Fix tread by tread down the flight, pulling the runner taut over each nosing as you go
- Recheck centring every 3-4 steps rather than assuming it holds
- Finish and trim the bottom edge cleanly into the gripper or floor junction
Check for loose boards before you start
A creaking or slightly loose tread is far easier to screw down before the runner goes on than after. Walk every step in bare feet during prep and mark any that flex or creak.
Stage four: final walk-down inspection
Once the runner is fully fixed, walk the entire flight slowly, checking for ripples, loose edges, uneven margins, and any staple or tack head sitting proud of the pile. Press firmly on each nosing to confirm there's no give or lift at the tread-riser junction. Check the bottom finish sits flat against the floor without a trip-catching lip, and check the top transition into any landing carpet is smooth. Fix anything you find now - once furniture and daily traffic resume, small problems get walked into bigger ones fast.
It's also worth photographing the finished flight from the top and side. Not for show - it gives you a dated reference point to compare against in a year or two when checking for wear patterns, which helps you spot early problems (like nosing wear starting sooner than expected) before they become a full re-fit.
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.
Still deciding on material, width or pattern? Our hub on stair runners compares weaves, widths, backings and fitting styles side by side, then hands the numbers straight to the calculator.
Frequently asked questions
What's the first thing to check before installing a stair runner?
Confirm your total flight measurement, including any landing or turn, against your ordered runner length before you unroll anything. It's much easier to sort a shortfall before cutting starts than after you're several treads into fitting.
How much waste allowance should a checklist include?
Budget 5-10% over your calculated flight length as standard, rising to 10-15% if your material has a large pattern repeat or your flight includes a turn or winder that needs extra material to keep the pattern aligned.
Should I check every step's measurements or just one?
Check every step individually, especially in older homes. Builders rarely cut every tread and riser to identical dimensions, and small variations compound over a flight of 12-15 steps into a noticeable discrepancy if you only measured one.
What should I inspect after the runner is fitted?
Walk the whole flight checking for ripples, uneven side margins, proud staple or tack heads, and any lift at the nosings. Also confirm the bottom edge sits flat without a trip lip and the top transition into landing carpet is smooth.
Do I need to check for loose stair boards before fitting?
Yes. Any creaking or flexing tread should be screwed down before underlay and runner go on, since it's far harder to access and fix once the runner is fixed in place over it.
How often should I recheck centring during installation?
Every 3-4 steps. A runner can drift off-centre gradually without it being obvious tread by tread, so periodic rechecks against both side margins catch drift early enough to correct cheaply.
What tools are most often missing from a DIY checklist?
A bolster or stair tool for pushing the runner into the tread-riser angle, and enough spare staples or tacks to finish the whole flight without a mid-job supply run, are the two most commonly underestimated items.
Is underlay really necessary on a checklist for a short flight?
Yes, regardless of flight length. Underlay cushions impact and protects the runner backing from wearing against the tread edge, and skipping it on even a short flight noticeably shortens the runner's working life.
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.
Check your measurements against the calculatorEvery 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.