Double Glazing Advice & Tips

The cost of new uPVC casement windows can vary significantly based on several factors: the number of windows, the style, the glass specifications, and the finish.

On average, a standard white uPVC casement window can cost anywhere from £350 to £600 fully installed. However, opting for colours like Anthracite Grey or Woodgrain finishes will increase the price. Similarly, upgrading to acoustic glass or specific security enhancements adds to the overall investment.

The best approach is to get a tailored quote. At Double Glazing Plus, we provide clear, itemized pricing without the high-pressure sales tactics common in the industry. We focus on giving you the best value for premium, A-rated windows.

Windows don't last forever. Over time, the seals can fail, mechanisms can wear out, and frames can warp. If you're noticing drafts around the edges of your windows, it's a clear sign that the seals are no longer performing as they should, leading to heat loss and higher energy bills.

Another major red flag is condensation forming between the two panes of glass. This means the hermetic seal has broken, and the insulating gas (like argon) has escaped, replacing it with moisture-laden air. This renders the double glazing highly ineffective.

Finally, if your windows are difficult to open, close, or lock, or if you can hear significantly more outside noise than you used to, it's time to consider a replacement. Upgrading to modern uPVC casement windows solves these issues instantly, providing better security, acoustic insulation, and thermal efficiency.

The Window Energy Rating (WER) scheme is the UK's national system for assessing the energy performance of windows. Ratings range from A++ down to E, with A being highly efficient. But does this rating translate to real-world benefits? The short answer is yes.

A-rated windows are designed to have minimal heat loss, preventing the warmth generated by your heating system from escaping. They achieve this through advanced frame design, warm-edge spacer bars, and high-performance glass coatings that reflect heat back into the room while allowing solar gain from the sun.

In 2026, A-rated windows remain the benchmark recommended by industry bodies and installers alike. Building regulations continue to push for higher energy performance in all new and replacement glazing, meaning an A-rating is increasingly the minimum expectation rather than a premium upgrade — making it the smart choice for any homeowner planning ahead.

While they may cost slightly more upfront than lower-rated alternatives, A-rated casement windows pay for themselves over time through significantly reduced heating bills. They also make your home more comfortable, eliminating cold spots near windows and increasing the overall value of your property.

Heating your home accounts for a massive portion of your energy bills. Older, inefficient windows are responsible for up to 20% of a home's heat loss. By replacing them with modern uPVC casement windows, you effectively put a thermal blanket around the vulnerable openings of your house.

The savings can be substantial. According to the Energy Saving Trust, upgrading from single glazing or old double glazing to A-rated windows can save a typical semi-detached home over £150 a year. As energy prices fluctuate, the financial protection offered by good insulation becomes even more valuable.

With energy prices remaining elevated through 2026, the case for efficient glazing is stronger than ever. Households that upgraded in previous years are now seeing the full benefit of those savings, while those still running older windows are bearing the full brunt of high tariffs — making now an excellent time to act.

Beyond direct energy savings, new windows require less maintenance, reducing ongoing costs. They also protect your interior furnishings from UV fading. Investing in high-quality double glazing from a reputable installer like Double Glazing Plus ensures you maximize these savings for decades to come.