Sliding Doors in Ireland — Aluminium Sliders, Lift-and-Slide, and the U-value Trade-Off
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Aluminium sliding door (3 m): €3,500–€7,000. U-value 0.8–1.2. Lift-and-slide is the warmest; standard slide is the cheapest.
Aluminium sliding door (3 m wide, triple-glazed) in Ireland: €3,500–€7,000 installed. U-value 0.8–1.2 W/m²K. Lift-and-slide: warmest, easiest to operate on large panels, most expensive. Standard slide: cheapest, harder to operate on large panels, can be draughty if not perfectly aligned. Modern triple-glazed sliders are within 0.2 W/m²K of bifolds — both can hit BER A1. The opening size matters: a 3 m slider needs 6 m of clear wall; a 4 m slider needs 8 m. Most Irish self-builds use a 3 m or 4 m slider for indoor-outdoor flow on the south or west elevation. Frame: aluminium is standard; timber and alu-clad are warmer but more expensive.
When this matters most
You're considering a sliding door for indoor-outdoor flow.
When this doesn't apply
You've already specified the door.
Sources
NSAI, I.S. EN ISO 10077. https://www.nsai.ie/
Frequently asked questions
How much does a sliding door cost in Ireland?
Aluminium sliding door (3 m, triple-glazed): €3,500–€7,000 installed. Lift-and-slide: €5,000–€9,000. Standard slide: €3,000–€5,000.
What is the warmest sliding door?
Lift-and-slide, triple-glazed, alu-clad timber frame. U-value 0.7–0.9 W/m²K. The warmest sliding door available in Ireland.
Are sliding doors as warm as bifolds?
Modern triple-glazed sliders are within 0.2 W/m²K of bifolds — both can hit BER A1. Lift-and-slide sliders can be warmer than bifolds.
When this matters most
You're considering a sliding door for indoor-outdoor flow.
When this doesn't apply
You've already specified the door.
Where to go next
Next decision
The next step in your build sequence.
- Door Budget for a Self-Build in Ireland — Internal Doors, External Doors, and Ironmongery →
- Front Door in Ireland — Composite, Timber, Aluminium, and What the BER Counts →
- Garage Door in Ireland — Sectional, Roller, or Up-and-Over, and What the BER Counts →
- Passive House Windows in Ireland — U-value, Frame, and What the Certifier Wants →
- Window Energy Rating in Ireland — What the Label Means and Why It Matters for BER →
- Window Installation in Ireland — Cavity Closer, Dpc, and the Airtightness Detail →
Branch into
Adjacent decisions at the same stage.
Watch out for
Common mistakes, hidden costs, gotchas.
Compare with
Alternative approaches worth knowing.