Whatever your project, we’re here to help make your vision a reality

At NK, we know every project is as unique as the person behind it, so we work directly with you to create the best solutions for you. From the initial design consultation through to manufacturing and installation, our friendly and expert team will be with you every step of the way.

Better by design: find out why our windows have the edge

NK’s high-performance windows are all built to exacting European standards for durability and to make homes warmer and more comfortable: choose from fixed, sliding, outward opening, or combinations that include our versatile Tilt & Turn design. 

Create an outstanding welcome with our high-performance doors

From front doors, to bifolds, sliders and French doors, all our doors are expertly built, offer high levels of security and superior insulating properties that will reduce your home’s energy consumption to keep you cosy and safe all year round.

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Your dream door awaits

Work with one of our design advisors to create an impressive entrance. Whatever your style, we can create the door for you.

The smart choice – find out why nobody regrets choosing uPVC

uPVC windows and doors provide superior insulation and security, boast greater durability, and require less maintenance, making them an energy-efficient and cost-effective choice for discerning homeowners worldwide.

Christchurch

0800 344 3126 | info@nkwindows.co.nz

17 Hammersmith Drive, Wigram, Christchurch 8042

Wellington

04 384 9909 | info@nkwindows.co.nz

Cromwell

03 445 0172 | info@nkwindows.co.nz

Unit 1, 4A Ree Crescent, Cromwell 9310

Find your local NK

Talk directly with one of our team and get a closer look at the quality and structure of our windows and doors. 

Our team is ready to answer your questions, provide a quote, share insights, and help you choose the right products for your project. 

News from NK

The Ultimate Guide to Cleaning & Maintaining Your uPVC Windows

Upgrading to uPVC double-glazed windows is a smart move for a comfortable, energy-efficient home. To keep your windows looking pristine and performing their best, regular care is key.

Myths and Misconceptions about uPVC Windows

Even as uPVC becomes more common, some myths and misconceptions are still persist, casting doubts on the true benefits of uPVC doors and windows.

Bringing Innovation Back Home

We recently embarked on a trip to Germany and Austria, diving headfirst into the world of window technology and innovation. Today, we wanted to share some of the exciting things we learned and how they'll impact the windows you'll see from NK Windows in the future.

Frequently asked questions

See our Glossary for any terms you want to clarify

The uPVC profile undergoes precision cutting and welding, with steel insertion and the fitting, testing, and glazing of opening and locking hardware all taking place in our Christchurch factory. Our glass is custom processed and cut by Viridian Glass. 

PVC is short for polyvinyl chloride, a type of plastic widely used in construction and various industries since the 1950s. uPVC, or unplasticised PVC, is a specific form of PVC that is highly suitable as a material for window frames. 

Its versatility allows it to be used in diverse applications, ranging from window frames and pipes to medical products. 

Absolutely. The roots of uPVC windows trace back to 1959 when the first commercially available windows graced homes in Germany. Over the years, technology has advanced, and yet, some of those initial uPVC windows are still standing strong. In fact, more than 60% of European homes now boast the reliability of uPVC windows and doors. 

Yes. Viewed across its lifecycle, uPVC is highly competitive in terms of environmental impact. Several recent eco-efficiency and Life Cycle Assessment (LCA) studies on the most common applications show that, in terms of energy requirements and GWP (Global Warming Potential), uPVC is at least equal to alternative products. In many cases, it shows advantages both in terms of total energy consumption and lower CO2 emissions.

The core materials for uPVC production – chlorine and ethylene – are both by-products of other manufacturing processes. Chlorine is a by-product of caustic soda production with source raw materials of seawater and rock salt. Ethylene is a by-product of the petroleum refining industry i.e. PVC is not directly dependent on crude oil. 

Our frames are also highly recyclable.

Absolutely. Our PVC profiles specifically engineered with New Zealand’s climate in mind, including those intense UV rays. The same robust formula stands resilient in other high UV environments such around the world, such as the Middle East, Australia and Latin America. 

Definitely. Many of our customer projects involve renovations. We understand the importance of preserving character, and our robust uPVC frames are perfect for bungalows and villas.

Yes! We offer a full range of outward-opening windows, with traditional or contemporary styling. Find out more here

No. “uPVC windows” refers only to the frame material. We have access to the same glass options as any window supplier through our partnership with Viridian Glass based in Christchurch. Most common options include: 

  • LightBridge Double Glazing – includes argon and Low E 
  • Laminated glass for improved security and noise reduction
  • Obscure glass for increased privacy
  • Tinted glass for improved privacy and reduced solar gain

Aluminium – there are several reasons to choose uPVC instead:

  1. Thermal performance – aluminium is highly heat conductive so they are not well suited to temperate climates and houses fitted with them require additional energy consumption for heating and cooling and often suffer condensation problems. See here for more detailed information.
  2. Health – condensation breeds mould and with mould come dangerous spores. Such environments have been proven to be associated with respiratory illnesses: nose and throat symptoms, cough, wheeze, and asthma symptoms. There is also evidence that these environments can be associated with shortness of breath, the development of asthma in people who did not previously suffer from it, and lower respiratory symptoms (coughing, wheezing, chest tightness, and shortness of breath).
  3. Environmentally responsible – aluminium is produced from the non-renewable ore, bauxite. Aluminium production requires a great deal of energy (225MJ/kg) and it generates huge amounts of environmentally dangerous pollutants like carbon dioxide, acidic sulphur dioxide, along with polyaromatic hydrocarbons (PAHs) fluorine and dust. Although New Zealand does produce aluminium, all raw materials are imported: bauxite/alumina from Australia, crude oil from Alaska USA, and coal from China and Korea – again adding to the environmental impact of aluminium windows. See here for more information.

 

Wood – there are equally strong arguments for choosing uPVC over wood:

  1. Environmentally responsible – most people believe using wood is the most environmentally sensible option for window frames because of the “natural is better than synthetic” assumption. But if wooden frames are to maintain their technical and thermal properties, they require regular treatment with chemicals that are often very environmentally unfriendly.
  2. Lifecycle – DEFRA (Department for Environment Food & Rural Affairs – UK government) commissioned a study into the lifecycles of PVC and timber in window profiles. In analysing the various impacts across the lifecycle, it was found that there are only marginal differences in the environmental performance between the two. Although trees are not a scarce resource, the facts around de-forestation, particularly logging of ancient or old-growth forests, warrant further understanding. The logging of these forests can lead to a decrease in biodiversity, as habitats are destroyed in the logging process. Tree plantations are grown, in their place, for the intense farming of timber and wood products. This itself can lead to soil erosion and nutrient degradation, vulnerability to pest attack, reduction in water supply, over use of fertilisers and social impacts.
  3. Sustainability – Caution needs to be taken in accepting claims of an increase in forested areas. Scandinavia presents an interesting example relating to the misconceptions surrounding so-called ‘sustainable forestry’. Eco watchdog, Friends of the Earth comment: “More trees are not a good thing when they are replacing valuable wildlife habitats. Scandinavia has now just 5% of its original old-growth forest remaining, yet this is still being logged. Also almost 50% of Finland’s peat bogs have been drained, mostly for planting managed forests.”
  4. Quality –  like most items of organic origin, not all wooden windows are the same. There are good quality and poor quality wooden windows available in NZ. Poor quality wooden windows can warp and delaminate. uPVC gives you a quality finish, every time.

Regular cleaning and maintenance are essential for all windows, as they can accumulate stains and damage over time due to pollution, weather, and various other factors. By adhering to proper cleaning and maintenance guidelines, you can optimize the appearance, functionality, and longevity of your windows.

See our After-care section to assist you in caring for your windows.

Navigating the regulations for planning permission can be intricate and perplexing. Permitted Development offers the opportunity to undertake specific home development projects without planning permission. However, it is crucial to adhere to planning guidelines to prevent any costly errors. Contact our team to find out more.

Under normal circumstances you will not need a builder if replacing windows and doors, we will do the work required. However, we do not carry out structural work, so in that case, the services of a builder would be required.

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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Everything you need to know about choosing the right windows and doors for your project with tips and advice, resources and much more.