You see the world at its best through an Altherm window, no matter the view.

Perfect for you

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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APL Window Solutions

At APL, it’s all about quality. From aluminium extruding, to surface finishing, specialised manufacturing, distribution, and we continually invest in leading-edge products and processes.


Our dedication to quality extends to looking after our diverse network of manufacturers. We work hard to open the right doors for our manufacturers and employees.


APL Window Solutions is the parent company of Altherm Window Systems. 

APL and Sustainability

Build better buildings to shape a better world

APL believe by building better buildings we're helping to shape a better world. Our approach to sustainability is all-encompassing.


We are working to pave a way forward for ourselves, and others in large industrial companies to do our bit for the environment. We are striving to make the future better for generations to come, and our country, through the steps we take in our business on a daily basis.

Tools to inspire you

 
Get Started

9 helpful tips to inspire and get you started with Altherm Window Systems

 
Inspiration gallery

Find the best window and door options for your living, kitchen, bathroom and entranceway

 
Product finder

Discover our comprehensive product range - designed to complement any project