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Energy efficient double glazed windows

One of the best ways to cut your energy bills is to replace old windows with modern, energy efficient uPVC windows and doors. Great workmanship with the best materials will help keep your home warmer in the winter months, and help reduce your heating bills.

Windowlines windows have top environmental credentials. They've been awarded an energy rating of A and are made of materials that achieved a British Fenestration Rating Council (BFRC) Green Guide A rating. Not only that, they have excellent U-value ratings and the very best Window Energy Rating (WER).

Save on energy bills with double glazed windows

More than 30 years of knowledge and expertise go into the design of Windowlines casement windows.

As well as improving your home’s energy efficiency, you’ll be helping the environment. According to the Glass & Glazing Federation:

“homes are currently responsible for around 28% of UK CO2 emissions, contributing to the impact of climate change."

What do the Building Regulations say about replacement windows?

From 1 October 2010, you’re only allowed to install replacement windows that have a WER energy rating of C or higher. So you can be confident our thermally efficient windows will satisfy Building Regs.

By replacing your existing windows with our uPVC windows, you’ll make your rooms quieter, more secure and more thermally efficient.

Improved energy efficiency is just the start of what our windows will do for your home.


By teaming up with one of the UK's leading manufacturers and suppliers, our products meet the most stringent industry standards. This means you get high performing windows and doors that offer your home security and protection at our lower prices.

BS EN 14351-1:2006 + A1:2010 relating to the performance characteristics of uPVC windows and doors.
BS 6375 Parts 1 & 2 relating to the weather performance of uPVC windows and doors, that is air permeability, water tightness and wind resistance, and operation and strength.
BS EN 12608 relating to uPVC profiles for the fabrication of windows and doors.
ISO 9001/2000 Quality Management System.
ISO 14001/2004 relating to the manufacture and supply of PVC extrusions and gasket windows and doors, including PVC foils; the supply of aluminium profiles for the construction industry; and the warehousing and delivery of the above.


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