Defenster

Welcome to Defenster, a leading double glazing company operating in Dunbartonshire and Greater Glasgow. With many years of experience in all aspects of window and door installation, we have established ourselves as a trusted, referred, and recommended company in the industry. We take pride in every aspect of what we do and strive to be among the minority of glazing companies who truly value the importance of high-quality workmanship.

At Defenster, we specialise in windows, double glazing, UPVC conservatories, porches, door, and window installation. We use UPVC windows exclusively because we believe in their superior qualities, such as minimal maintenance, resistance to rot, warping, and discolouration, and good weathering and thermal performance. Our UPVC windows are designed and manufactured to provide high energy efficiency, all-around home comfort, exquisite beauty, and lasting durability.

We offer a range of options to meet your needs, budget, and taste, and our team of experienced tradesmen, not salesmen, will provide you with the best advice without the hard sell. At Defenster, we are committed to providing our customers with the highest level of service and quality.

Our Services

At Defenster, we offer a range of services to meet your window, door, and conservatory needs:

• Windows: Our UPVC windows are designed and manufactured to provide high energy efficiency, all-around home comfort, exquisite beauty, and lasting durability. They are extremely easy to operate and clean and require practically no maintenance. Our window systems add value to your home and are a worthwhile investment.
• Doors: We supply and install doors, windows, conservatories, and patio doors. Our doors are designed for maximum security and ease of use and manufactured to the highest quality standards. We offer a variety of styles in different colours to suit your home.
• Conservatories: Our conservatories are the most affordable way to add space to your home. They are available in a range of colour options and can be crafted to an extensive range of styles, enabling you to choose the right character of conservatory for your home. Constructed from a combination of low maintenance PVC-U, steel reinforcements, and preferred specification performance glazing, our conservatories are aesthetically pleasing and engineered to withstand the inclement British weather.

At Defenster, we are committed to providing our customers with the highest level of service and quality. We use only the best materials and employ the most experienced tradesmen to ensure that your installation is completed to the highest standards. Contact us today for practical advice and a free, no-obligation quote.