Internal room dividers and 90° corner bifold doors
Internal slimline aluminium bifold doors between a kitchen-diner and front sitting room cost €2,200 to €3,900 supplied and fitted for a 3-panel or 4-panel set. External 90-degree floating corner bifold sets add €1,600 to €2,900 for the movable corner post assembly plus cantilevered corner steelwork.
How to zone open-plan Irish homes with heritage Crittall-style room dividers, or open two sides of a rear extension with a floating corner post.
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Zoning kitchen-diners and sitting rooms with internal bifolds
Many Irish homeowners knocked the wall between the front sitting room and back kitchen during the 2000s and 2010s, only to find the whole downstairs is noisy and hard to heat on winter evenings. Internal aluminium room-divider bifolds (€2,200 to €3,900 supplied and fitted) let you fold the wall completely flat against the reveal during the day and close it tight in the evening.
- True 0mm floor guide or top-hung track: Internal systems can use a wafer-thin surface guide or recessed brush channel so your wooden floor or tiles run straight through without a trip hazard.
- Heritage steel-look (Crittall style): Available with slim 25mm–35mm astragal glazing bars in matt black (RAL 9005) and 6.8mm acoustic laminated safety glass that cuts television and kitchen noise while letting south-facing light reach the front room.
How floating (postless) 90° corner bifold doors work
On a wrap-around kitchen extension, two sets of external bifold doors can meet at a 90-degree corner with no fixed brick pier or corner column. When both sets fold back, the interlocking floating corner mullion travels with the lead panels, leaving the entire corner of the room open to the patio.
| Component | How it is engineered | Guide cost impact |
|---|---|---|
| Movable floating corner mullion | Two lead frames interlock with twin compression seals and heavy-duty shootbolts into the head and floor track | Adds €1,600 to €2,900 to the two door sets |
| Cantilevered steel goal-post / box frame | Two welded structural steel beams meet at the corner without a corner post; must be designed by a structural engineer | €3,200 to €6,500 (builder & steel fabricator) |
| Fixed 90° aluminium corner post (alternative) | A slim 90mm×90mm structural aluminium post stays at the corner; far simpler steelwork above | €600 to €1,100 post cost |
Real examples and installation detail
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Questions homeowners ask
Do internal bifold doors need double glazing?
Usually no, unless one side is an unheated conservatory or porch. Between two heated living rooms, 6mm toughened or 6.8mm acoustic laminated single glass keeps the panels light, slim and quiet.
Are floating corner bifold doors weather-tight in Ireland?
On sheltered patio corners, modern floating corner mullions with twin EPDM gaskets and multi-point shootbolts seal tightly. On exposed coastal sites, a slim fixed 90mm structural corner post gives higher wind-load rigidity at lower structural steel cost.
Bifolding doors across all 26 counties
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Planning bifold doors for an extension or patio knock-through?
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