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Trusted for over 40 years

Altherm Window Systems is well known and trusted by New Zealand home owners, designers and builders, with over 40 years of local innovation and a manufacturer network stretching from Whangarei to Dunedin.

There is much to inspire us when we look around, from residential to high performance and large format windows and doors. We offer a wide range of solutions for all homes, from entrance doors to windows, sliders, bi-folds and thermally efficient options, Altherm has an option to suit every need. Find the perfect Altherm product that works for your build. 

Altherm is a brand of APL, the largest window solutions organisation in New Zealand.