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Flanges and Liners:


For solid construction the windows may be installed without flanges and jambliners or with flanges but no jambliners. This could reduce the cost of the windows and doors. For more information about flanges and liners click here


Good size window and glass:


Small size windows not only look out of portion because PVC-U frames are quite big, they are difficult to manufacture – cut, weld and assemble.


Some glass supplier’s minimum charge for double glazing is 0.3 square meters, which is 500mm by 600mm glass or 400mm by 750mm.


Opening sizes vs opening numbers:


Windows are used for ventilation when they are open. Two small size opening windows may provide the same ventilation as one big size opening window but could cost more because of two sets of hardware and more material & labour cost.


The same applies to door designs. For example a 3.6 meter wide opening door, 6 panel bi-folding design will cost a lot more than a 4 panel bi-folding door design. Our hardware from Germany has no problem for 900mm wide heavy double glazed doors. The 4 panel design will also have good size glass panels while the 6 panel design will have glass only about 400mm wide because PVC-U door sash profile is about 100mm wide at each side.


Sliding and stack doors vs Bi-folding doors:


Bi-folding door hardware from Germany is quite expensive. Sliding and stack doors are less expensive options.


Safety glass vs normal glass:


NZS4223 is the standard for human impact glass safety which requires safety glass for some designs of windows and doors for example full height fixed windows.


Safety glass is more expensive. By changing designs to reduce the use of safety glass can reduce the cost of windows and doors. For example adding in transoms at 800mm to 1000mm height from floor in fixed windows or sliding/stack doors will make normal glass meet standard requirements.