Sliding Doors in Ireland — Aluminium Sliders, Lift-and-Slide, and the U-value Trade-Off

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.

TL;DR

• Aluminium sliding door (3 m wide) 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.

• Modern triple-glazed sliders are within 0.2 W/m²K of bifold — both can hit BER A1.

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.

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.

Sources

NSAI, I.S. EN ISO 10077. https://www.nsai.ie/