Summary

Stairlifts and platform lifts solve the same underlying problem — getting someone with limited mobility safely between floors — but they solve it in fundamentally different ways, and the choice between them is rarely a matter of preference. It's driven by the user's specific mobility needs, whether they use a wheelchair full-time, the physical geometry of the staircase or void available, and the household's budget and funding route. Getting this decision wrong at the assessment stage wastes the client's money and, in the worst case, delivers equipment the user physically cannot use safely.

A stairlift is the right answer for someone who can transfer onto a seat and has enough upper body control to sit safely during transit, but who struggles with the exertion or fall risk of climbing stairs — commonly an older person with reduced mobility, recovering from a hip or knee operation, or with a progressive condition that hasn't yet affected their ability to transfer. A platform lift — either a vertical platform lift travelling in open air (typically for a short rise, such as a half-flight or porch step) or a through-floor lift travelling in an enclosed shaft between two floors — is the right answer for a full-time wheelchair user who cannot or should not transfer out of their chair, or for anyone whose condition means transferring onto a stairlift seat is unsafe or undignified.

This decision sits at the intersection of building regulations guidance (Part M consistently states that a passenger lift or platform lift is the preferred accessible solution over a stairlift, because it doesn't require a transfer), funding rules (the Disabled Facilities Grant, DFG, funds either option based on an Occupational Therapist's recommendation, not the tradesperson's), and practical site constraints — a curved staircase, a narrow stairwell, or the lack of a floor void for a through-floor lift shaft will often make the decision for you before cost even enters the conversation.

Key Facts

Quick Reference Table

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Factor Stairlift Vertical Platform Lift (short rise) Through-Floor Platform Lift
Requires transfer from wheelchair Yes No No
Typical cost, new (2026) £2,200–£10,000+ £5,000–£15,000 £15,000–£35,000+
Structural work Minimal (rail fixed to treads) Minimal to moderate (platform base, guarding) Significant (floor opening, shaft, headroom void)
Suitable for full-time wheelchair user Rarely Yes Yes
Typical travel height Full staircase flight Up to ~3m (short rise) Between two full storeys
Lead time 1–2 weeks straight; 2–6 weeks curved 1–3 weeks 3–8 weeks (design + build work)
Building Regs standard BS EN 81-40:2020 BS 6440:2011 BS EN 81-41:2010 / BS 5900:2012
Part M preference ranking Last resort Second preference Second preference (with passenger lift as first)
Ongoing servicing Annual Annual Annual, often with lift maintenance contract
Reduces staircase width for other users Yes No (separate to stairs) No (separate to stairs)

Detailed Guidance

When a stairlift is the right recommendation

A stairlift suits a client who:

The critical failure mode to watch for at survey stage: assessing only the staircase and not the user. A tradesperson or installer should never proceed on a stairlift quote without confirmation — ideally from an Occupational Therapist — that the intended user can safely transfer. Installing a stairlift for someone who cannot transfer wastes the client's money and creates a fall risk at exactly the point (the top or bottom transfer) where the equipment is meant to reduce risk.

When a platform lift is the right recommendation

A platform lift — vertical or through-floor — is the right answer when:

Structural and building work differences

This is where the two options diverge most sharply in cost and disruption. A stairlift's structural intervention is limited to fixing the rail into the stair treads (and sometimes the stringer or skirting on longer runs) — the treads and staircase structure must be sound, but no new opening or enclosure is created.

A through-floor lift requires cutting an opening through an existing floor structure — typically around 1.1m × 1.4m, with the exact dimensions set by the specific lift model — plus:

A vertical (non-enclosed) platform lift sits between the two in terms of building work — it needs a solid, level base and usually a guarding/enclosure structure around the lift shaft area, but no floor penetration, making it considerably less disruptive than a through-floor lift.

Cost comparison in more detail

Option Typical installed cost (2026) What drives the cost
Straight stairlift, new £2,200–£3,800 Standard rail length, minimal building work
Curved stairlift, new £4,500–£10,000+ Bespoke-manufactured rail to site template
Vertical platform lift, short rise £5,000–£15,000 Rise height, guarding/enclosure requirement
Through-floor lift, compact 2-person £12,000–£20,000 Floor opening, structural trimmers, shaft
Through-floor lift, wheelchair-capable £20,000–£35,000+ Larger cabin, structural work, finishes

Both routes can reduce the customer-facing price significantly through VAT zero-rating where the customer qualifies, and both can be wholly or partially funded through the DFG — but the grant is means-tested and capped, so any shortfall between the grant ceiling and total project cost (including any associated building work) falls to the household.

The Occupational Therapist's role — and why the tradesperson shouldn't make this call alone

For DFG-funded work, and as good practice even for privately-funded projects, an Occupational Therapist assessment determines which type of lift is appropriate for the individual's specific mobility needs, not the installer's judgement of "what fits." The OT assessment considers transfer ability, cognitive factors (can the user operate the controls safely and understand the interlocks), weight-bearing capacity, and the layout of the home. A tradesperson quoting this kind of work should always ask whether an OT assessment has taken place and, if it hasn't, recommend the client obtain one — particularly before committing to a stairlift, given how consequential getting that wrong is for someone who genuinely cannot transfer.

Combining or phasing the two

In larger adaptation projects — particularly where a household includes people with different mobility needs, or where a condition is progressive — it isn't unusual to install a stairlift now with a future through-floor lift installation planned into the design (e.g. leaving a floor void un-boarded, or designing a downstairs room that could later become a bedroom with a lift connection). Discussing this trajectory with the client and their OT at the design stage avoids abortive work later.

Frequently Asked Questions

Can a stairlift be retrofitted if the household later needs a platform lift instead?

Yes, but they aren't a straightforward swap — a stairlift removal leaves fixing holes in the treads/stringer to make good, and a subsequent through-floor lift installation is an entirely separate structural project. There's no cost or installation synergy between the two; each is priced and built independently.

Is a platform lift always more expensive than a stairlift?

Not always at the low end — a short-rise vertical platform lift for a porch step or a single half-flight can come in similar to, or even below, a bespoke curved stairlift, because it avoids the cost of a custom-manufactured rail. But for a full storey-to-storey journey, a through-floor lift is reliably more expensive than a stairlift covering the same staircase, because of the structural building work involved.

Does Building Regulations Part M require a platform lift in every adaptation project?

No — Part M applies most directly to non-domestic buildings and new-build/major-renovation dwellings, setting out an accessibility hierarchy (passenger lift preferred, platform lift next, stairlift as a last resort) for designers to follow. In an existing private dwelling being adapted for a specific resident, the practical decision is usually driven by the OT assessment and site constraints rather than a strict regulatory requirement to install a platform lift over a stairlift — but the Part M hierarchy remains the reference point used to justify the choice, particularly on DFG applications.

Do both stairlifts and platform lifts need annual servicing?

Yes — both are mechanical lifting equipment with safety-critical components (obstruction sensors, interlocks, battery backup, drive systems) and manufacturers require annual servicing to maintain the warranty, in addition to being good practice under general work equipment safety principles.

Which option is better for a household with mixed mobility needs (one wheelchair user, one person who can walk but struggles with stairs)?

A platform lift serves the wheelchair user but does nothing for someone who can walk but finds the stairs tiring, since they'd still need to use the platform lift for every journey. In genuinely mixed-need households it's not uncommon to install a stairlift (which the walking household member can bypass by using the stairs normally, and the person needing help can use) alongside separate consideration of the wheelchair user's needs — this is exactly the kind of scenario an OT assessment is designed to untangle, rather than the tradesperson guessing at survey stage.

Regulations & Standards