Renovating? Double-glazing increases warmth and reduces bills

Lower energy bills

Upgrading windows to uPVC double-glazing can save up to 50% of your energy costs

Improve house value

Investing in high-quality double-glazing with uPVC frames will increase your home’s value and curb appeal

Meet NZ Building Code

Meet the latest building code standards for new homes or additions requiring consents

The ‘how to’ behind replacing your windows

The NK process – we’re with you every step

Let’s talk

Call, email or visit a showroom to discuss your vision for your project with our experienced and friendly team.

Free in-home consultation

We'll visit your home to assess the project and help you make the right decisions about style, finishes, timelines and budget.

Measure up and manufacture

We'll take accurate measurements and once we've finalised the design, we'll order the glass and start making your windows and doors at our Christchurch factory.

Prepare for installation

We will agree an installation date and tell you how to prepare for our installers. It's unlikely you will need to move out.

Sit back and enjoy your comfortable home

We'll check you're happy with everything and brief you on how to care for your new windows and doors, and how to make
any adjustments.

Service and maintenance

Simply contact us at any time if you're concerned or want advice/ideas. We have the parts and people to help you keep your home in tip-top condition.

“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

Costs of replacement windows and doors

What’s the cost to retrofit windows with uPVC double-glazing?

It’s one of the first questions we get asked – it’s fair enough. But with so many variables, we can’t give you a cost estimate without knowing more about your project, design and preferences.

We can tell you, however, that double-glazed windows will lower your energy and maintenance costs, making them a worthwhile investment.

Renovation guide

How to renovate with double-glazing

If you’re considering upgrading your windows or doors, our guide shows you:

How uPVC frames compare to timber and aluminum
How our windows and doors are warmer, safer and quieter
Style and colour choices
What our customer say

Upgrading your windows and doors is an investment you want to get right. Grab our Renovation Guide to help get it right.

Why our customers choose NK Windows

Industry leaders

Local knowledge

uPVC expertise

German precision

Service focused

Partnership

Upgrade to double-glazing today with a 0% interest green loan

Old, inefficient windows let valuable warmth escape, leaving your home uncomfortable year-round.

Upgrading to energy-efficient double glazing can change that – helping you stay warm, reduce heat loss, and cut down on your power bills.

And with a 0% interest green loan from one of New Zealand’s leading banks, you could make the switch with no upfront cost and no stress.

Am I eligible for a green loan?

It’s easy to upgrade your home – just meet the following criteria to be eligible

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