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Install patio sliding doors.
Slim aluminium or uPVC sliders — 2, 3 or 4-panel, with thermally-broken frames and lift-and-slide options.
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Costs, timelines, pitfalls and the right questions to ask before any doors starts on patio Sliding Doors.
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Top tips
Hiring a doors, without the regret.
Four moves that separate a smooth job from a nightmare.
Roller failure
Cheap nylon rollers wear in 5–8 years on heavy leaves. Specify stainless steel ball-bearing rollers — they last 20+ years.
Track contamination
Sand, grit and pollen clog the lower track and gum the rollers. Brush weekly in summer; vacuum quarterly.
Cold draft at meeting stile
Cheap brush seals fail after 5 years. Lift-and-slide systems use compression seals that last 15+ years.
Bowing on tall leaves
2.4m+ tall leaves can bow under wind load. Specify the manufacturer's high-wind glass spec for exposed sites.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
uPVC 2-track 2.4m, supplyBudget option
£1.4k–£2.4k
Aluminium 2-track 3m, supplyUK premium market
£2.8k–£5.5k
Aluminium 3-track 4.5m, supplySchueco, Reynaers, SunFlex
£5.5k–£9.5k
Installation labour2 days, glass lifter required
£600–£1.4k
Structural openingIf widened
£1.2k–£3.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Doors explained
Sliding patio doors give the largest single pane of glass and the slimmest framing of any door type. They are the choice for owners wanting maximum garden view when the doors are closed. Expect to pay £2,000–£12,000 fitted in the UK depending on width, configuration and glass specification.
What Does the Work Involve?
Sliding doors come in two-track (one fixed, one sliding) or three-track (two sliding, one fixed) configurations. The frame is bedded into a prepared structural opening; the track is levelled within 1mm over its full length; the leaves are lifted into the track (heavy units need a glass-lifter or 3–4 fitters). Lift-and-slide systems use a handle that lifts the leaf onto its rollers before sliding — these give better weather seal but cost more. The multi-point lock engages along the meeting stile.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| uPVC 2-track 2.4m, supply | 1,400 | 2,400 | Budget option |
| Aluminium 2-track 3m, supply | 2,800 | 5,500 | UK premium market |
| Aluminium 3-track 4.5m, supply | 5,500 | 9,500 | Schueco, Reynaers, SunFlex |
| Lift-and-slide system | +1,500 | +3,500 | Upgrade on most ranges |
| Installation labour | 600 | 1,400 | 2 days, glass lifter required |
| Structural opening | 1,200 | 3,500 | If widened |
How Long Does It Take?
Installation on a prepared opening is 1–2 days. Structural work to widen the opening adds 3–5 days. Lead times for stock colours are 5–8 weeks; bespoke RAL or oversized panels can be 10–14 weeks.
DIY or Professional?
Professional — and ideally a glass-lifter (vacuum-lifter) on units over 3m wide. Heavy panes (40–80 kg per leaf) cannot be safely manoeuvred by two people without specialist kit. Track levelling is critical — 1mm tolerance over the full width.
Choosing the Right Tradesperson
FENSA or Certass registered. Ask the brand — Schueco, Reynaers, SunFlex and Smart Systems are the UK premium tier; Origin OS-44 is a strong mid-market option. Insist on stainless rollers, not nylon. Ask the U-value of the complete unit — modern triple-glazed systems achieve 1.0 W/m²K. Get a 10-year warranty in writing.
UK Regulations
Doors must meet Part L (U-value ≤1.4 W/m²K). Structural opening changes need Building Regs approval. Glazing within 800mm of finished floor level must be P1A laminated safety glass (Part K). FENSA or Certass self-certifies the door install.
Common Problems
- Roller failure: Cheap nylon rollers wear in 5–8 years on heavy leaves. Specify stainless steel ball-bearing rollers — they last 20+ years.
- Track contamination: Sand, grit and pollen clog the lower track and gum the rollers. Brush weekly in summer; vacuum quarterly.
- Cold draft at meeting stile: Cheap brush seals fail after 5 years. Lift-and-slide systems use compression seals that last 15+ years.
- Bowing on tall leaves: 2.4m+ tall leaves can bow under wind load. Specify the manufacturer's high-wind glass spec for exposed sites.
Frequently Asked Questions
Sliding doors vs bi-folds?
Sliders give bigger glass panes and slimmer sightlines when closed (often only 20–40mm of frame visible between panes). Bi-folds open wider when open. For mostly-closed garden views, sliders win; for indoor-outdoor entertaining, bi-folds win.
What is lift-and-slide?
A handle that you lift before sliding raises the leaf off its compression seal onto the rollers. This gives much better weather sealing when closed and reduces wear on the rollers. Worth the upgrade for exposed coastal sites.
How wide can a sliding door be?
Common sizes are 2.4m, 3m, 3.6m, 4.2m, 4.8m and 6m total width. Above 6m the leaves get unmanageably heavy; pocket-door or telescopic systems handle wider openings.
Are sliding doors secure?
Yes — modern systems have multi-point locking, anti-lift devices to prevent leaves being lifted off the track, and PAS 24:2022 certification. Specify a 3-star Sold Secure cylinder.
Can the threshold be flush with the floor?
Yes — flush thresholds give a seamless transition. Specify a recessed water-management channel under the track for exposed sites.
How heavy are the leaves?
An aluminium 3m × 2.4m leaf with double glazing weighs roughly 80–120 kg. Triple glazing adds 30–40%. This is why a glass-lifter is essential for install.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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