Introduction
You need a straight stairlift if your stairs run in one straight line with no turns or landings, and a curved stairlift if they have any bend, turn or intermediate landing. A new straight stairlift typically costs from around £1,650 to £2,500 fitted and can often be installed within days, while a curved one usually costs £3,500 to £5,500 for a single bend and takes a few weeks, because the rail is made to measure.
This guide explains the key differences, helps you work out which you need, and gives an honest cost comparison for 2026.
The Simple Test: Do You Need Straight or Curved?
Stand at the bottom of your staircase and look up. If the stairs run in a single uninterrupted straight line from bottom to top with no turns, bends, corners, or intermediate landings, you have a straight staircase and need a straight stairlift.
If the stairs have any of the following, you need a curved stairlift:
- A turn or bend partway up
- An intermediate landing (a flat section between two flights)
- A quarter-turn or half-turn (90 degree or 180 degree turn)
- A spiral or helical layout
Some staircases that look curved or swept at the bottom are actually straight for most of their length. A home surveyor can clarify this - sometimes what appears to be a curved base is an aesthetic design feature on what is still a straight-track staircase.
How Straight Stairlifts Work
A straight stairlift uses a standard length of aluminium track cut to fit your specific staircase length. The rail is fixed to the stair treads (not the wall) and the carriage runs along it from bottom to top.
Because the rail is a standard component cut to size, manufacturing is quick. Most straight stairlifts can be ordered and installed within a few days of the home survey - sometimes within 24 hours if there is local stock.
The relatively simple construction keeps costs down. A new straight stairlift in 2026 typically costs from around £1,650 to £2,500 installed, depending on the brand and any optional extras chosen. See stairlift prices by brand.
How Curved Stairlifts Work
A curved stairlift uses a bespoke rail manufactured specifically for your staircase. Every bend, angle, and length is measured during the survey, and the rail is then produced to match those exact dimensions. No two curved rails are the same.
This manufacturing process takes time - typically two to four weeks from survey to delivery - and costs significantly more than a straight rail. The rail must follow the geometry of your stairs precisely, which requires specialist design and production.
Installation once the rail arrives usually takes four to eight hours. A new curved stairlift in 2026 typically costs £3,500 to £5,500 for a standard single-bend staircase, with complex layouts reaching £8,000 or more. See our guide to curved stairlift costs.
Straight or curved, see your priceTell us about your staircase and get a free instant guide price, then compare prices from vetted UK suppliers covering your area.
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The Cost Difference: What You Are Actually Paying For
The price gap between straight and curved stairlifts is not profit margin - it reflects genuine manufacturing cost.
A straight rail is a standard component. A curved rail is a custom-engineered piece of metalwork built once for your stairs and only your stairs. That is why curved stairlifts cost two to three times more than equivalent straight models, and why a curved stairlift rail rarely has any resale value - it cannot be re-fitted in a different property.
Summary for 2026:
- New straight stairlift installed: from around £1,650 to £2,500
- Reconditioned straight stairlift installed: from around £1,250
- New curved stairlift installed: £3,500 to £5,500 (standard single bend), £8,000+ for complex staircases
- Reconditioned curved stairlift installed: £2,500 to £4,500 (if a rail match can be found)
Most buyers with a long-term illness or disability can buy either type VAT-free, which saves 20%.
Can a Straight Stairlift Work on a Curved Staircase?
Not safely. A straight stairlift rail cannot follow a bend in the stairs. Attempting to fit one would result in either the carriage derailing at the bend or the rail stopping short of the top, leaving you unable to complete the journey.
If you have a curved staircase, a curved stairlift is the right solution. There is no shortcut.
One exception worth noting: if your staircase has an intermediate straight section long enough to accommodate a standard rail, some specialists can sometimes fit two separate straight stairlifts with a transfer platform at the landing. This is an uncommon arrangement and not suitable for everyone, but can occasionally offer a cost saving over a full curved system. Ask your supplier whether this is feasible for your specific staircase layout.
Other Things to Consider
Beyond the basic straight-or-curved question, a few other staircase characteristics affect which type of stairlift you need:
- Width: Very narrow staircases (below 680mm) may require a slimline model. Both straight and curved versions of slimline stairlifts exist.
- Angle: Very steep staircases (above 45 degrees) can affect which models are suitable. Your surveyor will confirm this.
- Wall vs open side: Most stairlifts can be fitted on either side, but local access factors and where the user boards and dismounts affect the best side. This is assessed during the survey.
- Doors at the top or bottom: A hinged rail may be required if a door opens near the bottom of the stairs, to allow the rail to fold away when not in use.
Frequently Asked Questions
If your staircase runs in a straight line from bottom to top with no bends, turns, corners, or intermediate landings, you need a straight stairlift. If it has any turns, a landing, or curves, you need a curved stairlift. A home survey will confirm this definitively.
A curved stairlift rail is custom-manufactured specifically for your staircase geometry. Unlike a straight rail, which is a standard component cut to length, a curved rail is individually designed and produced for each installation. The manufacturing time, specialist materials, and engineering involved are what drive the higher cost.
A curved stairlift typically takes two to four weeks from survey to installation, as the custom rail needs to be manufactured first. Once the rail arrives, installation takes a full day. A straight stairlift can often be installed within 24 to 48 hours of the survey, using standard stock components.
No, not safely. A straight rail cannot follow the bends in a curved staircase. You need a curved stairlift if your staircase has any turns, bends, or intermediate landings.
Possibly, with caveats. A reconditioned curved stairlift can save 30 to 50 percent compared to new, but only works if the rail fits your staircase. A reputable supplier will survey your stairs before selling a reconditioned curved model. Never buy a reconditioned curved stairlift without a proper survey confirming the rail matches your staircase layout.
Conclusion
The choice is straightforward once you know your staircase: straight stairs need a straight stairlift, curved stairs need a curved one. The cost difference is real - a new straight stairlift starts from around £1,650 to £2,500 fitted, while a curved one usually costs £3,500 to £5,500 for a single bend - and the wait is longer.
If you have a straight staircase, you have more options, faster installation and lower costs. If you have a curved staircase, get at least three quotes, as prices vary considerably between suppliers. Get a free guide price for your staircase.
Written by Stair Lift Comparison · Content Team