Bifold doors in Berwick & Casey.

• 3-panel bifold, 2.4–3.0m: $5,000–$7,500 installed.
• 4-panel bifold, 3.0–3.9m: $6,000–$9,000 installed.
• 5-panel bifold, 3.9–4.8m: $8,000–$12,000 installed.
• 6-panel bifold, 4.8–5.7m: $10,000–$14,000 installed.
• 7+ panel custom, 5.4m+: From $13,000.

Add 30–50% for thermally broken double-glazed premium spec. Add $2K–$5K if the existing opening needs widening with a new steel lintel.

Fold patterns — which way do the panels go?

Bifolds can fold all to one side, two-and-two split fold, or any combination depending on panel count. The pattern is chosen at design based on:

• Where the alfresco furniture sits — you don’t want folded panels blocking the BBQ.
• Which side of the opening has wall to stack the folded panels against.
• Whether one of the panels needs to operate as a single “day door” for everyday foot traffic without folding the whole thing open.

Day-door & everyday use.

A common bifold spec includes a “traffic door” or “day door” — one end panel that opens independently like a regular hinged door for daily foot traffic to the deck without folding the whole array open. This is the right answer for families who don’t want to fold 4 or 5 panels just to step outside with the dog. About 70% of our Berwick bifold installs include a day door.

Top-hung hardware: why it matters.

Modern residential bifolds are top-hung — the panel weight hangs from a robust top track, the bottom is just a flush threshold and guide. Two advantages over old bottom-rolling systems: (1) the threshold can be a low-profile flush detail that you can roll a vacuum or pram across (no big track to trip on); (2) the rolling parts are protected up out of weather and dirt so the action stays smooth long-term. We standardise on Centor and Brio — both Australian-made with 20–25 year hardware warranty on residential bifolds.

Weather-tightness & AS 2047.

Every bifold we install is AS 2047 compliant from a tier-1 manufacturer (Centor, Capral, Stegbar, Wideline). Double bulb seals between every panel, multi-point compression lock on the lead panel, shoot bolts top and bottom on the intermediate panels. When locked, water-tight under typical Berwick rain and wind conditions. The cheap-import bifolds with single brush-pile seals are the ones that leak — we don’t install those.