There are six types of stairlift in common use in the UK: straight, curved, narrow-stair, outdoor, heavy-duty and standing. Most homes only need one of them. Working out which one is the difference between a comfortable install and an expensive mistake. This guide walks each type, what fits, what each costs roughly, and how to make the call.

If you are not sure whether a stairlift is the right answer at all, our Is It Time For A Stairlift? guide covers that decision. If you already know you need one and want costs, see stairlift prices.

The six types in one paragraph each

Straight. A single rail bolted to a staircase that goes straight up with no turns. The most common type, the cheapest, and the fastest to install. Almost any UK home with a straight staircase suits one.

Curved. A custom-shaped rail that follows a staircase with one or more turns, half-landings, or a corner at the top or bottom. Made to measure. More expensive and longer lead time than straight.

Narrow-stair. A slim seat or perch design fitted to staircases that are narrower than a typical UK staircase. Some manufacturers offer dedicated narrow-stair models, some adapt their standard model.

Outdoor. A stairlift fitted to outside steps, usually leading from a back door to a garden, or from a front step to a path. Weatherproofed, with covers and corrosion-resistant rails.

Heavy-duty. A reinforced stairlift built for users above the standard weight limit, with a wider, stronger seat and a higher-rated motor.

Standing or perch. A small platform at standing or semi-standing height, useful for users who cannot bend their knees enough to sit comfortably or whose stairs are too narrow for a seated lift.

Which one fits your home

Three questions decide it, in this order:

1. Does your staircase turn? If the staircase is a single straight run from one floor to the next, you need a straight lift. If it bends, has a half-landing, or comes round a corner at top or bottom, you need a curved lift.

2. How wide is the staircase? A standard UK staircase is around 80 to 90 cm wide. If yours is much narrower than that, especially in older terraced or cottage properties, you may need a narrow-stair model. A surveyor will measure with the seat at install width to confirm.

3. Is the user a typical fit? If they weigh significantly above standard adult weight, or cannot bend their knees, or the lift is for outdoor steps, the type changes. Heavy-duty for higher weight, standing or perch for limited knee bend, outdoor for outside steps.

For most UK homes the answer is straight (single staircase) or curved (with a turn). Everything else is a special case for a specific need.

Straight stairlifts

The simplest, fastest, and cheapest type. A straight rail runs along the side of a single straight staircase, the seat travels up and down on it, and the install is usually completed in a half-day.

When you need a straight stairlift

You need a straight stairlift if your staircase has no turns, no half-landings, and no corner at top or bottom. The vast majority of post-war UK semis and terraces have straight staircases. Most pre-war properties and many cottages have at least one turn somewhere, which moves you into curved territory.

Most major UK brands make straight lifts and most installers fit them. The drive systems are mature, parts are widely available, and the resale market for straight lifts is the strongest of all the types.

What a straight install looks like

A typical install is 2 to 4 hours. The rail is bolted into the stair stringers (the wooden side panels), not the wall, so plasterboard walls are not a problem. Power comes from a nearby socket, and the lift charges at parking points at the top and bottom of the rail.

Straight stairlifts on narrow staircases

Most straight-stairlift models fit comfortably on a typical UK staircase. For narrower staircases, a slim-seat or fold-back model gives more clearance. The minimum width depends on the seat model, the user, and how the seat folds. A surveyor confirms the fit with a tape measure on the day.

Curved vs straight stairlifts

The two are not interchangeable. A straight lift cannot be fitted to a turning staircase. A curved lift can technically be fitted to a straight staircase but is markedly more expensive, so no one does that.

The cost difference is large. A curved lift’s rail is custom-bent to your staircase, which is a manufacturing job that takes weeks and adds significantly to the price. A straight rail is cut to length from a stock profile.

For brand-specific comparisons see our best straight stairlift brands and best curved stairlift brands pages.

Curved stairlifts

Curved stairlifts handle staircases that turn. The rail is made to measure for your specific staircase, which is what makes them more expensive and slower to install than straight lifts.

When you need a curved lift

You need a curved lift if your staircase has any of the following:

• A quarter turn (90 degree corner) at top or bottom
• A half-landing partway up
• A double half-landing (two turns with a flat platform between)
• A long sweep or winder (steps that fan out around a corner)
• A spiral or helical staircase (rare and complex)

For spiral, helical, and unusual configurations, see our specialist guides on multiple turns and landings and spiral and helical staircases.

Lead time and cost driver

The single biggest driver of curved-lift cost is the rail. It is bent to your staircase shape in a factory, which takes longer than a stock straight rail. Lead time from survey to install is typically several weeks. The longer or more complex the rail, the higher the cost.

For typical price ranges see curved stairlift costs.

Resale

Curved-lift resale value is much weaker than straight. The reason is fit: the rail was made for your staircase and rarely fits another. The seat and drive system have value but the rail is often scrapped. If buying a curved lift, factor in that the rail has limited resale value at the end of life.

Narrow-stair stairlifts

If your staircase is narrower than the standard UK width, a normal stairlift can leave you with very little walking space when the seat is folded down. Narrow-stair models address this with slim seats, dedicated mounts, or a perch design.

For most users, the question is not whether a narrow-stair model exists, but how narrow your staircase actually is. The honest answer is in the tape measure, taken at the narrowest point of the run.

How narrow is too narrow

Most modern stairlifts fit on staircases as narrow as roughly 70 cm wide, though the comfortable minimum varies by seat model and user. Below that, the options are a slim model with a smaller seat, a perch lift (semi-standing), or a different solution entirely.

For specific dimensions and the slimmest models in the UK, see our slimmest stairlift page.

Narrow staircases in terraced houses

Older terraced houses and Victorian cottages often have noticeably narrower staircases than modern builds. Sometimes much narrower at the top of the run than at the bottom. A surveyor measures every step and quotes accordingly. See our terraced houses guide.

Steep and narrow combined

If the staircase is both narrow AND steep, the choice gets harder. The steeper the rise, the more important seat angle and footrest design become. See steep and narrow stairs for the technical detail.

When a stairlift will not fit

If the staircase is genuinely too narrow even for slim models, the alternatives are: a perch or standing lift (smaller footprint), a downstairs living conversion (no stairlift needed), or in some cases a through-floor home lift. Alternatives for very narrow stairs.

Outdoor stairlifts

Outdoor stairlifts are fitted to external steps, usually a few metres of rise leading from a back door to a garden, or from a front path up to a front door. They are weatherproofed throughout: the rail, the seat, the motor housing, and the charging contacts.

What is different about outdoor lifts

• The rail finish. Powder-coated or galvanised, not bare steel.
• The seat covers. Marine-grade or weatherproof fabric, often with a removable rain cover.
• The drive housing. Sealed against rain and dust ingress.
• Bracket fixings. Bolted into masonry or paving, not into wooden stair stringers.
• Servicing cadence. Many providers recommend six-monthly rather than annual service.

Planning permission

Most outdoor stairlifts do not need planning permission, particularly if they are on private land at the back of the property. Some configurations on the front of a listed or conservation-area property may. See outdoor planning permission.

What outdoor lifts cost

Outdoor lifts cost more than indoor straight lifts and the gap can be meaningful. The weatherproofing, the masonry brackets, and the more complex install all add to the price. See outdoor stairlift costs.

Outdoor vs ramp

For shallow rises (a few steps from path to front door), a ramp is sometimes the better option. Ramps are cheaper, need no power, and last longer. They also need horizontal space, which isn’t always available. See outdoor stairlift vs ramp for the comparison.

Heavy-duty stairlifts

Standard stairlifts are rated for typical adult weights. Heavy-duty stairlifts are reinforced for users above the standard limit, with a wider seat, a stronger frame, and a higher-rated motor.

Heavy-duty vs standard stairlifts

The differences:

• Weight rating. Standard lifts typically rate up to around 25 stone (160 kg). Heavy-duty models rate higher, usually 30 stone (190 kg) or more depending on the brand.
• Seat width. A wider seat with stronger arms and a deeper backrest.
• Motor and drive. A stronger motor that handles the additional load without strain.
• Footrest. A larger, more supportive footrest.
• Cost. Higher than the standard equivalent. See heavy-duty costs.

Are heavy-duty lifts safe for daily use

Yes, when serviced annually and used within their stated weight rating. The safety mechanisms (brake, seatbelt, footrest sensors) are tested under the higher load before the model is certified. The single most important factor is using the lift within its stated weight, not above.

Heavy-duty on narrow stairs

This combination is harder to satisfy. A heavier-rated lift typically has a wider seat, which is the opposite of what a narrow staircase needs. Some manufacturers offer slim heavy-duty designs but availability is limited. A surveyor confirms what fits.

Standing and perch stairlifts

Standing and perch stairlifts replace the seated platform with a small standing or semi-standing pad. They suit users who can stand safely on a small platform but cannot bend their knees enough to sit comfortably on a seated lift.

Who standing stairlifts suit

The clearest fit is users who:

• Have stiff knees or hips that prevent comfortable bending
• Have had a knee or hip operation that limits the bend angle
• Live in a home where the staircase is too narrow for a seated lift
• Use a perch design at home for arthritis or joint comfort

The clearest mismatch is users who cannot stand safely on a small platform without holding on. If standing on the lift would itself be a fall risk, a seated or perch design with a backrest may be the answer.

Are standing stairlifts safe

Yes, when used correctly. The platform has a guard rail, a safety bar, and a stop sensor. The user holds on with both hands and the lift moves at low speed. The risk is greater than with a seated lift if the user has poor balance, so a clinical view (GP, OT) is useful before fitting.

Standing stairlifts on narrow stairs

One genuine advantage of a standing lift is footprint. Without a seat, the platform is much smaller, which means a standing lift fits on staircases where a seated lift would not. For very narrow stairs, this is sometimes the only stairlift option.

For fuller detail see standing stairlifts.

What “fits” really means

Beyond the type choice, four measurements decide whether a particular model fits:

Tread depth. The horizontal depth of each stair, front to back. Affects footrest clearance.

Rail length. The total length from top step to bottom step along the staircase, including any turns.

Doorway and corner clearance. Where the lift parks at the top, will the seat or footrest obstruct an upstairs door? Where it parks at the bottom, will it block the front door or hallway?

Power supply. A nearby socket on the same circuit, ideally not on a spur. Most installs add a fused spur.

A free home survey covers all of this. Most reputable installers will not quote a price without one. If a quote is being offered without a survey, ask why.

What to ask the fitter before they survey

• Are you BHTA-registered? Membership of the British Healthcare Trades Association is the standard signal of a reputable fitter.
• What warranty is included on parts and labour? 12 to 24 months is normal, longer is better.
• Is the first year of servicing included? Many installers include it.
• Will you remove the lift at end of life, and at what cost? A removal price quoted at install gives you visibility into the full lifecycle.
• What buy-back options are there? Some installers buy back, especially straight lifts under five years old. More on selling a stairlift.
• What does the warranty exclude? Battery wear, drive belt, upholstery wear are common exclusions. Read the document.

Related guides

• Is it time for a stairlift? The decision before the type.
• Stairlift prices in the UK. Cost ranges by type.
• Stairlift grants and funding. Disabled Facilities Grant, charity, and finance.
• Stairlift rental. When renting is the better option.
• Reconditioned stairlifts. The cheaper route for most straight-stair installs.
• Living with a stairlift. Install, servicing, repair, sell, remove.
• Best stairlift companies in the UK. Brand pages.

Last reviewed: May. Author: Jacob Whitmore, Editor. Editorial policy: how we research, source and verify.