Quick answer: Sliding patio doors in the UK cost £1,200–£3,500 fitted for a standard 2-pane uPVC unit, £2,500–£6,000 for aluminium, and £5,000–£12,000+ for premium “lift and slide” aluminium systems. The price drivers are: number of panes (2 vs 3 vs 4), frame material (uPVC vs aluminium), threshold height, and glass spec (standard double vs acoustic vs solar-control). This guide covers the realistic price ranges, when sliding doors beat bi-fold or French alternatives, and what to verify before signing.
Sliding doors vs bi-fold vs French — at a glance
| Sliding patio | Bi-fold | French | |
|---|---|---|---|
| Cost (3m opening) | £1,500–£4,000 | £3,500–£8,000 | £1,000–£3,000 |
| Maximum opening | ~67% of overall width | ~90% of overall width | ~100% of overall width |
| Floor space when open | None | Stack inside or outside | Swing inwards or outwards |
| Glass area when shut | Maximum | Reduced by frames | Reduced by mullions |
| Threshold | Low or flush options | Low or flush options | Step-over standard |
| Best for | Modern look, max view, no floor space loss | Wide openings, full view to garden | Traditional homes, patios up to 2m wide |
For comparable cost guides, see our bi-fold doors guide and French doors guide.
Cost breakdown by configuration
2-pane sliders (one moving, one fixed)
- uPVC, 2.4m wide: £1,200–£2,000 fitted
- uPVC, 3.0m wide: £1,400–£2,400
- Aluminium, 2.4m wide: £2,200–£3,500
- Aluminium, 3.0m wide: £2,500–£4,000
The classic “patio door” — most homeowner installs are this configuration. Maximum opening width: about 50% of the total (one full pane).
3-pane sliders (one moving across two fixed)
- uPVC, 3.6m wide: £2,000–£3,200
- uPVC, 4.5m wide: £2,500–£3,800
- Aluminium, 3.6m wide: £3,500–£5,500
- Aluminium, 4.5m wide: £4,200–£6,500
One pane slides behind/in front of two fixed panes. Maximum opening: 33% of total. Best for wider openings where you want minimal frame interruption.
“Lift and slide” premium systems
- Aluminium, 3.0m wide: £4,500–£7,500
- Aluminium, 4.5m wide: £6,500–£10,000
- Aluminium, 6.0m+ pocket-sliding: £8,000–£15,000+
The handle lifts the entire pane onto rollers before it slides — much smoother and seals tighter. Used in high-end builds. Brands to know: Schüco, Reynaers, Cortizo, Origin. Worth the premium only if you want truly large panes (3m+ wide single panel) that operate effortlessly.
What affects the price
- Material: uPVC is cheapest, aluminium adds 50–100%, premium hardwood adds 100–200%
- Frame thickness: slim aluminium frames (38mm sightline) cost more than chunky standard frames (60mm+)
- Glass spec: standard A-rated double glazing is included; acoustic-laminated adds £150–£300 per pane (see our acoustic glass guide); solar-control glass adds £50–£150 per pane; triple glazing adds 25%
- Threshold: standard step-over is cheapest; low threshold (10–15mm step) adds £100–£200; flush threshold (level for wheelchair access) adds £200–£400
- Colour: white uPVC is cheapest; anthracite/bespoke colours add 15–25%
- Hardware: standard handles included; concealed/branded hardware (e.g. for premium aluminium) adds £100–£300 per door
- Installation difficulty: upper-floor balconies, conservation areas, lintel work all add to fitting cost
- Removal of existing: £150–£400 depending on what’s there
- Scaffolding (rare for ground-floor sliders): £400–£900
When sliding doors are the right choice
- You don’t want furniture or planters obstructed by an opening door — sliding doors don’t swing
- You want maximum unobstructed glass view when shut — fewer/thinner frames than bi-fold
- You have limited floor space on either side of the opening — bi-folds need somewhere to stack
- You want a modern aesthetic with very slim sightlines
- You only need ~50% opening width — sliding doors physically can’t open wider than one pane’s width
When to pick something else instead
- You want to fully open the wall in summer → bi-fold doors
- Opening is under 2m wide → French doors usually look better and cost less
- Conservation area / period property → French or sash-style might be required by planning
- You’re upgrading thermal performance most → triple-glazed casement windows beat any patio door for U-value at a given budget
Specs to verify before signing
- U-value (whole-door, Uw) — should be 1.4 W/m²K or better for Building Regs compliance. Premium aluminium can hit 1.0. See our U-values & WER guide for what “good” means.
- Toughened or laminated glass at low level — required by Building Regs Part K. Always specified on patio doors but worth confirming.
- Multi-point locking — Secured by Design accreditation or PAS 24 certification preferred for security.
- Anti-lift devices — sliding doors are physically lift-up-and-out vulnerable; modern hardware blocks this. Should be standard but ask.
- Trickle vents on habitable rooms — required by Approved Document F (2022). See our trickle vents guide.
- FENSA certificate + insurance-backed guarantee — every install. See our IBG guide.
- Threshold drainage — should be specified clearly so water doesn’t pool inside
Common mistakes to avoid
- Going aluminium for the colour when uPVC is now available in foiled anthracite that looks 95% identical at half the cost
- Picking the widest opening when 80% of the year you only use one corner — wider = more expensive without benefit
- Skimping on the threshold detail — water sitting against a sliding door rots flooring and frame. Spend the £200 on a proper drainage spec.
- Forgetting flyscreens — sliding patio doors can’t easily retrofit flyscreens once installed. Specify at order time (£100–£300) if you need them.
- Choosing a “lifetime warranty” cheap brand over a mid-priced FENSA installer with a real IBG
Frequently asked questions
Are sliding doors as energy efficient as casement windows?
Modern A-rated sliding doors typically achieve Uw 1.2–1.4, which is comparable to standard double-glazed windows. Premium aluminium with thermal break + triple glazing can reach Uw 0.9. The biggest energy difference comes from the perimeter seal — sliding doors have more linear seal than a casement, so quality of install matters more.
Can I get a sliding door to open both ways?
Yes — pocket-sliding systems disappear into the walls on both sides, giving full opening. Premium spec only — typically £8,000+ for a 6m opening. Not worth it for most homes; the marginal benefit over a 4-pane configuration with one moving pane each side rarely justifies the cost.
Do sliding patio doors need planning permission?
Replacing existing sliding doors in the same opening: no. Creating a new opening or significantly enlarging an existing one: yes if it affects the building’s facade in a planning-restricted area, or always if listed/conservation. Building Regs apply regardless via FENSA/CertAss notification.
How long do sliding patio doors last?
20–30 years for the frame; the rollers and runners typically need cleaning/lubrication annually and may need replacement every 10–15 years. Sealed glass units same as windows: 10–25 years. See our window lifespan guide.
Can I finance a sliding door install?
Yes — most major installers offer 0% finance for 12–24 months on installs over £2,000. Beyond that, interest-bearing 5- or 10-year personal loans are common (see our finance guide). Always check the cash-price-vs-finance-price for hidden uplifts.
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Related: Bi-Fold Doors Cost · French Doors Cost · Composite Doors Cost
Sources: Vufold bi-fold vs sliding cost comparison (2026), Origin Global pricing data, Schüco / Reynaers / Cortizo product datasheets, Checkatrade sliding door cost guide, MyJobQuote patio door pricing, Building Regulations Part K (glass at low level). Last reviewed: April 2026.
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