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Renovation guide

Ready to upgrade to uPVC? Download our free renovation guide

  • Safer
  • Warmer
  • Healthier
  • Quieter
  • Drier

Boost you home's energy efficiency and style

Are your windows outdated, draughty, or difficult to maintain? Upgrading to our uPVC windows will transform your home with improved energy efficiency, enhanced durability, and a modern look. But knowing where to start can be overwhelming – so we’ve created the ultimate renovation guide to help you through the process.

Download our comprehensive uPVC Window Renovation Guide and discover all you need to know about upgrading your windows and making your home more comfortable, efficient and secure.

What's inside the guide?​

Why choose uPVC?
Discover the key benefits of uPVC windows, from superior insulation and noise reduction to their low-maintenance properties and eco-friendly materials.
 
Energy savings explained
See how switching to uPVC windows can lower your energy bills. We break down the science behind heat retention and insulation so you can understand the impact on your home’s comfort and efficiency.
 
Seamless installation
We walk you through our installation process to ensure you choose the right options, focusing on precision, energy efficiency, and long-lasting performance for your home.
 
Case studies
Real-life stories from satisfied homeowners, showcasing the transformative impact of NK’s uPVC windows and doors on energy efficiency and home design.
"I can highly recommend NK Windows to anyone who wants high-performance glazing for their house. The team were a pleasure to deal with and accommodated all our requests. Easy and professional install. Thanks again!"
Elena & Alex
We had an excellent experience with NK windows, from doing the quote through to the final tweaks. They were very accommodating, and the install guys did an excellent job. Feels like a new house; would highly recommend the team to everybody.
Wayne Mackay
"Fantastic staff and product. Everyone we dealt with was knowledgeable, helpful, and genuine. There were some unavoidable delays with our project, but the communication was fantastic throughout. The price wasn't much above replacing with aluminium, and the performance of the uPVC is far superior. The house was instantly quieter, and it's noticeably warmer, with no more condensation."
Rachel Isdale
“They always feel warm and dry. It has definitely improved the temperature and comfort in the house, even in the room furthest away from the heat pump. If I have one regret, it's that we couldn't afford to exchange the entire house lot of windows and ranch sliders.”
A Topp
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LOWER NORTH ISLAND
Taranaki, Manawatu-Whanganui, Manawatu, Hawkes Bay, and Wellington
04 384 9909
By appointment
UPPER SOUTH ISLAND
Tasman, Marlborough, West Coast,
and Canterbury
03 344 3126
17 Hammersmith Drive, Wigram, Christchurch 8042
LOWER SOUTH ISLAND
Otago and
Southland
03 445 0172
Unit 1, 4A Ree Crescent, Cromwell 9310
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Everything you need to know about choosing the right windows and doors for your project with tips and advice, resources and much more.