Bifolding Door guides, calculator & reference
Every bifolding door cost guide, specification comparison, interactive calculator, FAQ and technical glossary on bifoldingdoors.ie in one place.
Browse the guides below or jump straight to the interactive calculator on the homepage.
Free, no obligation. One vetted bifold door company covering your county replies.
Core bifolding door guides
Detailed guides covering prices, specifications and what to check before you book.
Bifold doors cost guide3-panel €3,600 to €5,800, 4-panel €4,800 to €7,600, 5-panel €6,000 to €9,400, 6-panel €7,200 to €11,500, plus alu-clad and RSJ knock-through costs.See all bifold prices →
Aluminium bifold doorsPolyamide thermal breaks, 110mm–132mm slim sightlines, marine-grade RAL powder coating and traffic door layouts.Aluminium specs →
Bifold vs sliding patio doors90% clear open aperture vs bigger uninterrupted glass panes when closed: how both handle Atlantic wind and rain.Compare both →
Flush thresholds & drainageWeathered rebates vs flush internal-external floor tracks with linear ACO slot drainage (€450 to €950).Threshold guide →
Structural openings & lintelsWhy top-hung and bottom-rolling bifolds need zero-deflection RSJ steel lintels (€1,800 to €3,500) and 10mm–15mm tolerances.Lintels & regulations →
Internal & corner bifoldsInternal steel-look room dividers (€2,200 to €3,900) and 90-degree floating corner bifolds with cantilevered steel.Internal & corner sets →Calculators, FAQ and glossary
| Resource | What's inside | How it helps |
|---|---|---|
| Interactive Cost Calculator | Live price range | Select your specification options to get an instant Irish guide price. |
| Master FAQ Hub | 12 questions answered | Straight answers on pricing, preparation, timelines, rules and aftercare. |
| Technical & Trade Glossary | 15 terms defined | Plain-English definitions of every bifolding door specification and standard. |
| All 26 Counties Index | 26 county pages | Local housing data and one vetted bifold door company covering your county. |
Real examples and installation detail
Get a bifold door price for your opening
Tap your door type, approximate opening width and county. Your request goes to one vetted bifold door company covering your county for a site survey and written price.
Related 2026 Ireland Specialist Cost & Technical Guides
Cross-referenced Irish pricing benchmarks, SEAI/Revenue grant rules, and county specifications from partner reference hubs:
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Bifolding doors guides & price breakdowns
Straight answers to what people ask most: itemised costs, specifications, planning or grants, and what to check before you book.
More guides & resources: All guides & calculator hub · Technical & trade glossary · Frequently asked questions · All areas covered · About this site
Questions homeowners ask
How much do bifold doors cost in Ireland supplied and fitted?
In thermally broken aluminium, a 3-panel bifold door (2.4m–3.0m) costs €3,600 to €5,800 supplied and fitted, a 4-panel set (3.2m–4.0m) is €4,800 to €7,600, a 5-panel set (4.2m–5.0m) is €6,000 to €9,400, and a 6-panel set (5.2m–6.0m) is €7,200 to €11,500. Timber alu-clad frames run from €4,800 to €7,400 for 3 panels up to €9,600 to €14,200 for 6 panels.
How much does it cost to knock through a back wall for bifold doors?
Widening an existing rear window or standard 1.8m patio door opening—including propping the masonry, installing an RSJ structural steel lintel on concrete padstones, removing the masonry below, and plastering the reveals—typically adds €1,800 to €3,500.
Are bifold doors draughty or leaky in Irish winter weather?
Modern bottom-rolling aluminium and alu-clad bifold doors tested to BS 6375 / EN 12208 achieve Class 4 air permeability and 600 Pa water tightness when fitted with a weathered threshold or a recessed flush track paired with an external ACO slot drain.
What is a traffic door on a bifold set?
A traffic door (or lead door) is a single hinged panel built into the bifold run with its own lever handle and multi-point lock. It lets you nip out to the garden on a wet Tuesday morning like a normal back door without folding back the whole stack.
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.