Altherm Window Systems

Stylish contemporary lines, effective thermal technology and unwavering attention to detail have made Altherm a favourite with architects, designers and homeowners across New Zealand.


Altherm draws on a 40-year tradition of design and engineering excellence, so whatever the project, you'll find an Altherm product that's perfect for your build or renovation. Altherm offers 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. 


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