NK Windows specialises in high-quality uPVC windows and doors, offering energy-efficient, durable solutions for New Zealand homes. With over 20 years of experience, they provide custom double glazing to enhance comfort, insulation, and safety. NK Windows partners with homeowners, builders, and designers to create warmer, healthier homes that last. From planning to installation, NK Windows delivers expert uPVC window solutions, ensuring your home is more energy-efficient and comfortable. double glazing christchurch