Straight vs curved stairlifts: which one do I need?

The short answer: if your stairs run in a single straight line from bottom to top with no turns and no mid-landing, you need a straight stairlift (cheaper, faster, fitted in hours). If your stairs have a turn at the top, a turn at the bottom, a quarter-turn winder, or a mid-landing, you need a curved stairlift (custom-made rail, takes weeks, costs around twice as much). The choice isn’t really yours — it’s set by the geometry of your stairs.

The 30-second decision tree

Stand at the bottom of your stairs and look up. Ask yourself one question: does the staircase change direction anywhere between bottom and top?

• No. Single straight run from bottom step to top step. → Straight stairlift.
• Yes, even slightly. Any turn, any landing, any winder, anywhere along the run. → Curved stairlift.

That’s the entire decision. Everything else in this article is detail.

Straight stairlifts in detail

When you can have one

A straight stairlift fits any staircase that runs unbroken from bottom to top — no turn, no landing, no winder. The rail is a length of metal cut to fit your specific number of stairs, mounted to the treads (not to the wall or banister).

Most 1930s semis, post-war terraces, modern estate homes, and many Victorian terraces have straight stairs. New-build flats and houses almost always do. If you’re not sure — count the steps from bottom to top in a single line. If you can do that without turning your head, you have straight stairs.

What they cost

£1,800 to £3,800 installed, including VAT (which the user may not have to pay — see below). Direct-sale brands (Acorn, Brooks) start at the lower end; premium brands (Stannah) at the higher end.

How quickly they fit

Typically 5–10 working days from order. Some installers offer next-day fit on straight rails because the rail is cut from stock — no manufacturing wait. Reconditioned straight lifts can be fitted in 48 hours.

Slimline variants

If your straight staircase is narrower than around 700mm — common in Victorian terraces, mill town two-up two-downs, and Edinburgh Colonies — you’ll need a slimline model with a smaller seat. Some slimline straights use a perch-style seat for users who can stand and lean rather than sit conventionally. Worth measuring carefully; the quote tool above flags this automatically.

Curved stairlifts in detail

When you need one

Any of these stair features means you’re in curved territory:

• A quarter-turn at the bottom (the stairs turn 90 degrees just as you reach the hallway) — extremely common in Victorian terraces and many 1930s semis.
• A quarter-turn at the top (winder steps fanning round the top corner) — common in cottage-style and inter-war housing.
• A mid-landing (the stairs go up to a small platform, then turn 90 or 180 degrees and continue up) — common in larger Victorian and Edwardian properties.
• Multiple turns (any combination of the above).

A straight rail physically cannot navigate any of these. A curved rail is fabricated to match the exact shape of your stairs — designed in CAD from a precise survey, then bent and welded to fit.

What they cost

£4,200 to £8,000+ installed. The price varies more than for straight lifts because more rail length and more turns mean more material and more manufacturing time. A simple single-turn rail sits at the lower end; multiple turns and longer runs push toward the upper end.

How quickly they fit

Typically 4–6 weeks from order to install. The rail has to be measured, designed, manufactured, tested, then fitted — none of which can be safely shortcut. Some manufacturers (Acorn is one) pitch 2–4 week curved lead times in some regions.

Reconditioned curved lifts: rarely available

Worth flagging because people often ask. Reconditioned curved stairlifts are rare in the UK because the rail is made to measure for one specific staircase — it almost never fits another. Some refurbishers can salvage and reuse the seat/carriage and re-make the rail for your stairs, but the saving versus a new curved lift is usually small.

Why the cost difference is so big

It’s not the seat or motor — those are broadly the same between straight and curved models from the same manufacturer. The cost difference is the rail.

• A straight rail is a length of standard extrusion cut to the right length. Stock part, low cost, fast.
• A curved rail is bespoke. Each one is designed from precise measurements of your stairs, manufactured to match the angles, welded, painted, and tested before delivery. The labour and materials add roughly £2,500–£4,500 to the underlying cost.

This is why no installer can “discount” a curved lift down to straight prices — the manufacturing cost difference is structural.

Edge cases worth knowing

Small landings at the top of straight stairs

Common question: “My stairs are straight but there’s a small landing at the top — does that count as curved?” Answer: yes, almost always. If the stairlift needs to navigate even a 90-degree pivot to put you safely onto the landing, you need a curved rail. The exception is a powered swivel seat at the top of a straight rail, which rotates the user to face the landing without needing the rail itself to turn.

Multi-flight stairs

If your stairs are two separate flights with a substantial mid-floor landing between them, you have three options: a single curved rail spanning both flights (most expensive but most convenient), two separate straight stairlifts with the user transferring between them (cheapest but inconvenient), or a through-floor lift instead of a stairlift entirely. The OT or installer will guide you on which suits your mobility.

Spiral and tightly-curved stairs

Cottage stairs that twist tightly through 180 or 270 degrees in a small footprint are sometimes too tight for any stairlift, even slimline curved models. Period properties in the South West, the New Forest, the Cotswolds, and rural Norfolk often fall into this category. The quote tool above flags these geometries automatically.

Outdoor stairlifts: straight or curved

Outdoor models follow the same rule. A straight external flight (front steps from street to door, garden steps) takes a straight outdoor lift — add roughly £500–£900 to the equivalent indoor straight price for weatherproofing. Curved external flights are unusual but technically possible.

How to know for certain without a salesperson

Two ways:

1. Stand at the bottom and count. If you can see straight up to the top step in one unbroken line, you have straight stairs. If the line of stairs changes direction at any point, you have curved stairs.
2. Use the quote tool below. Enter the basic geometry of your stairs and it tells you what category you’re in, what the realistic UK price range is, and whether your specific stairs will accommodate a lift at all.

VAT relief: applies to both

Worth repeating because it matters most on curved lifts where the gross saving is biggest. If the person using the stairlift has a long-term illness or disability, the lift can be supplied zero-rated for VAT. On a £6,000 curved lift, that’s a £1,000 saving. The installer handles the paperwork — confirm it’s been applied when the quote arrives.

Get an honest UK price first

The quote tool below asks for the geometry of your stairs and gives you a realistic UK price range — straight or curved, with or without VAT relief — in about 60 seconds. No email needed to see the result. No phone calls. No sales follow-up.