Bifold doors vs lift-and-slide patio doors
Bifold doors open up roughly 90% of the structural aperture so your kitchen and patio become one space, whereas a 2-pane or 3-pane sliding door only opens 50% to 66% of the hole. Conversely, when closed on a wet Irish winter day, a lift-and-slide door has fewer vertical frame mullions and wider uninterrupted glass panes.
An honest engineering and cost comparison for Irish extensions, renovations and coastal sites.
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Pick the number of folding panels, your frame and glazing specification, and whether the structural opening is ready or needs an RSJ knock-through.
Estimated supply & fit guide
€4,800 to €7,600
Door supply & fit: €4,800 to €7,600 (13.5% VAT included)
Guide price for a 4-panel bifold door (3.2m–4.0m opening) in thermally broken double-glazed aluminium, supplied and fitted into a prepared structural opening. Includes a daily-use traffic door leaf, multi-point security locking and toughened low-E safety glass.
Send this for a written quoteBifolds vs lift-and-slide doors at a glance
| Feature | Aluminium bifold doors | Lift-and-slide patio doors |
|---|---|---|
| Clear opening when open | ~90% of the structural opening | 48% (2-pane) to 64% (3-pane triple track) |
| Vertical frame sightlines when closed | 2 to 5 mullions (110mm–132mm each) | 1 or 2 slim interlocks (25mm–50mm) |
| Everyday winter access | Fast — single hinged traffic door leaf | Slide heavy 150kg–250kg sash back and forth |
| 3.0m opening supplied & fitted | €3,600 to €5,800 | €3,400 to €5,600 (2-pane aluminium) |
| 4.0m opening supplied & fitted | €4,800 to €7,600 | €4,600 to €7,400 (2-pane or 3-pane) |
| Best suited to | Sheltered patios, kitchen-diners & entertaining | Exposed coastal/hilltop views & ultra-wide glass |
Viewing the garden for 300 days vs opening the wall for 65
The main trade-off in Ireland comes down to how you use the room between October and April versus May to September:
- Pick bifold doors if: You want a normal hinged traffic door for letting the dog out or stepping onto the patio every day, and you want the entire back wall of a 3m to 5m kitchen extension to fold completely clear on dry summer days.
- Pick lift-and-slide doors if: Your house faces an exposed coastal or upland view where you spend most of the year looking through the closed glass, and you want two huge 2.0m-wide glass panes with only a single central bar.
Do bifold doors lose more heat than sliding doors?
Because a 4-panel bifold door has more aluminium frame perimeter than a 2-pane slider, its whole-door U-value (Ud) is typically 0.1 to 0.15 W/m²K higher with the same glass. Upgrading a bifold door to 0.6 W/m²K triple-glazed units brings the whole-door Ud down to 0.9 to 1.0 W/m²K, outperforming any double-glazed sliding door.
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Questions homeowners ask
Are bifold doors or sliding doors more expensive in Ireland?
For a 3.0m to 4.0m opening, thermally broken aluminium bifold doors (€3,600 to €5,800 to €4,800 to €7,600) and heavy-duty lift-and-slide aluminium doors cost within 5% to 10% of each other. Ultra-slim minimal-frame sliders with bonded glass cost more than bifolds.
Which is better for a high-wind coastal site in Ireland?
For severely exposed Atlantic coastal elevations, a lift-and-slide door or a weathered-threshold alu-clad bifold is preferred because lift-and-slide sashes drop straight down onto continuous compression gaskets around the entire frame.
Bifolding doors across all 26 counties
Requests from all 26 counties go to one vetted local specialist who covers your county — from Dublin, Cork, Galway and Limerick to Kildare, Meath, Wicklow, Waterford and Donegal. Pick your county below for local prices, specifications and advice. Compare all areas covered →
Planning bifold doors for an extension or patio knock-through?
One vetted company covering your county surveys the opening, checks the lintel and threshold, and gives you a written price.