Energy efficiency

Better for the environment

Help to make a better future

When you choose NK Windows, you’re making a conscious decision for a greener tomorrow. Our commitment to warmer, quieter, healthier homes mean our window profiles are designed under stringent environmental regulations. Our uPVC windows are also miles above the new H1 building code for windows and doors, no matter where you live in New Zealand.

By opting for our uPVC windows, you’re taking a stand against deforestation, habitat disruption, and excessive energy usage.

New Zealand’s first 10 star Homestar rated house

Far too many New Zealand homes suffer from cold and damp conditions, impacting the health and well-being of kiwi families. Launched in 2010, Homestar is an independent rating system that rates the health, efficiency, and sustainability of New Zealand homes on a scale of 1-10. It evaluates various factors such as energy, water, waste, ventilation, health, and comfort.

Christchurch architectural designer Bob Burnett chose to partner with NK Windows when designing his super efficient 10 Homestar Built rated house. All external windows and doors were supplied by us and are standard doubled-glazed with argon and Low-E. Approximately 75% of all solutions we provide use exactly the same glazing options.

The Homestar rating system is essentially a measure of the quality, health and comfort of a dwelling and its energy use, plus other environmental attributes. Bob says, “We can easily do much better to make our homes healthier and more energy efficient and it is a myth that it is too expensive. Unfortunately many new home builders target the building code and perceive it equates to quality, when of course it is simply a minimum.” A house built only to code will achieve 3 or 4 stars out of 10.

Let’s talk about your project

Join us in building a sustainable future with our eco-friendly UPVC windows and doors. At NK Windows, we offer durable and energy-efficient solutions tailored for environmentally responsible projects. Let’s create spaces that prioritise sustainability without sacrificing style or performance. Take the first step towards a greener tomorrow with NK.

High performance

NK's uPVC window and door systems are essential for enhancing the energy efficiency and overall performance of high-performance homes. Homeowners can experience substantial reductions in energy consumption and enjoy enhanced comfort and functionality.

Passive houses

A passive house is a high-performance building that sets the gold standard for energy efficient living, designed to be optimised for health and wellbeing, while consuming very little energy. NK are proud to offer a range of products suitable for certified passive houses.

Superhome movement

We believe in making healthier and more energy-efficient homes a reality for everyone. That's why we are proud sponsors and members of the Superhome Movement, a not-for-profit organisation dedicated to transforming the New Zealand building industry.

Superior energy efficiency

Engineered with precision, our products provide exceptional insulation, minimising heat transfer and reducing the need for constant heating or cooling. The inherent thermal properties of uPVC contribute to a well-regulated indoor climate, resulting in significant energy savings and a more sustainable, comfortable living environment.

Don't just take our word for it...

Wayne Mackay
Wayne Mackay
Excellent experience
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We had an excellent experience with NK windows, from Tani doing the quote to the final tweeks, They were very accomodating and the install guys did an excellent job, feels like a new house, would highly recommend the team to everybody.
Roslyn Whitley
Roslyn Whitley
Exemplar service
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I cannot thank Martin and his team at NK Windows enough for the exemplar service they have provided. Right from the beginning, NK Windows showed exceptional professionalism through ongoing communication of updates, scheduling of work and guidance on how to prepare for installation. The work was completed well within the time frame provided and the contractors were so friendly, they cleaned the windows so well at the end I questioned whether the glass was installed!! The windows look absolutely amazing and have transformed and modernised my 1950's home. For anyone wanting a fast, efficient and professional service, I would recommend NK Windows as your go to company.
Phil Smith
Phil Smith
Exceptional products
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Our immediate thoughts were "our house no longer feels like it's leaking heat". Exceptional products that significantly outperform our 15 year old double-glazed aluminium windows. No more condensation. Tilt & turn windows and doors means we can securely ventilate ... and no longer run the risk of kids hitting their heads on an open window! I suggest you have a close look at glass options ... to reduce summer overheating we opted for Performatech206 on north and west faces. Standard Low E & Argon on all other windows.
Elena and Alex
Elena and Alex
Accommodated all our requests
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Can highly recommend NK Windows to anyone who wants high performance glazing on their house. Tani and the team were a pleasure to deal with, and accommodated all our requests. Easy and professional install, thanks again!I suggest you have a close look at glass options ... to reduce summer overheating we opted for Performatech206 on north and west faces. Standard Low E & Argon on all other windows.
A Topp
A Topp
Zero moisture
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...Now that we have had many months of all weather, I can say categorically that we have had zero, absolutely zero moisture on the inside of our new uPVC windows. 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 heatpump. If I have one regret, it's that we couldn't afford to exchange the entire houselot of windows and ranchsliders: uPVC is clearly hugely superior to the aluminium that's mysteriously still being used NZ-wide. If you have a choice, if you can afford to build, you'd be crazy to choose aluminium. Tania was incredibly patient working with us through several quotes to see just how much we could afford to do. Installation day went off without a hitch. Couldn't recommend these windows, and this company more.
Kat Dodd
Kat Dodd
Stress free experience
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We had such an amazing, stress-free experience with NK windows. Tani is wonderful and a real asset to the firm. She explained everything so clearly and at great details and was super flexible when we wanted to make changes to the plan. She oversaw the project and was always available, always super helpful and accomodating. The crew who installed the windows and doors was professional and the work they did was spotless. The after-care was also top-notch. The product itself is just superior and really transformed our house. Overall, we could not be happier with the service we got from NK, and we cannot recommend them highly enough.
Alicia Moggre
Alicia Moggre
Professionalism and knowledge
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We just had 8 windows and a new door installed by NK windows, and immediately notice the increased warmth and decreased noise inside the house. The windows look good and the opening tilt and swing hardware works really well. Particularly impressed by the professionalism and knowledge of the people we dealt with from the initial quote to the detailed measure and the final installation. The install guys were happy to answer all my questions and kept everything very tidy while installing as well, great attention to detail. PVC windows are the way to go, and we picked NK windows because we liked that they have their own NZ based factory to make sure windows are made for NZ building requirements and that they complete the install as well so it was easy, and we knew it was done right for the window requirements.
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