DOUBLE GLAZED WINDOWS - General topics - Colin's Sash Windows

Published on January 26, 2026 11:23 AM

A U value measures how much heat passes through a building element such as a window, door, or wall. For windows and doors, a lower U value means better insulation and less heat loss. In the UK, U values matter because they affect: How warm your home feels near windows Heating bills and energy efficiency […]

Published on January 22, 2026 1:23 PM

Argon-filled double glazing is the modern standard for energy-efficient windows, replacing ordinary air between glass panes with dense, non-toxic argon gas. By slowing heat transfer, these units achieve superior U-values (typically 1.1 to 1.5), significantly reducing home heating costs for a negligible increase in upfront price. In this guide, we break down how the technology […]

Published on January 21, 2026 1:22 PM

What is Blown Double Glazing? Blown double glazing occurs when the airtight seal surrounding a double-glazed unit (IGU) fails. Once this seal breaks, the insulating gas (usually Argon) escapes, and moist air enters the gap. The result is the tell-tale sign of “blown” windows: misting, fogging, or visible water droplets trapped between the two panes […]

Published on January 21, 2026 12:43 PM

  Double glazing typically lasts 20 to 30 years, but its lifespan depends on the quality of the sealed unit, the frame material, how well it was installed, and exposure to weather. In most cases, double glazing fails because the seal breaks down, not because the glass itself wears out. How long does double glazing […]

Published on May 3, 2025 1:12 PM

When it comes to keeping your home warm, quiet, and energy-efficient, windows are more important than you might think – especially here in the UK, where the weather can swing from sunny to soggy in no time. If you’re considering upgrading, you’ve probably heard about double glazing and triple glazing – but what do these […]

Published on March 13, 2024 1:52 PM

FENSA (Fenestration Self Assessment Scheme) certificate is an official document in the UK that confirms replacement windows and doors installed in a property meet building regulations. It is issued by FENSA approved installers after the completion of a project, ensuring that the installation is energy-efficient, safe, and carried out by a qualified professional. Being FENSA-approved […]

Published on March 11, 2024 7:26 PM

Georgian Bars and Astragal Bars are two popular window design elements that can add both elegance and functionality to your home. While they serve similar purposes, there are key differences between these two styles that homeowners should be aware of before making a decision. In this article, we will demystify the Astragal Bar, explore the […]

Published on February 7, 2024 6:25 PM

Casement windows are versatile and common fixtures in both traditional and modern homes. These windows are attached to their frames by one or more hinges at the side and can be single or double glazed.. Often made from materials such as uPVC, timber, or aluminium, casement windows offer clear views and can be tailored to […]

Published on January 3, 2024 1:59 PM

Exploring the Advantages of uPVC Flush Casements At Colin’s Sash Windows we sell a lot of uPVC flush casements and matching flush french doors. With 2 horizontal glazing bars they’ve got a very in vogue look. If your budget doesn’t stretch to our very popular aluminium Heritage doors you can create a similar look with […]

Published on December 15, 2023 12:08 PM

Georgian Sash Windows: The Crown Jewel of London’s £138 Million Aberconway House A residence near Hyde Park has recently become London’s most expensive home sold this year, fetching £138 million, making it the second-highest price ever for a home in the city. The purchaser is Adar Poonawalla, known as the “prince of vaccines” and CEO […]

Published on November 29, 2023 7:46 AM

In the heart of the city, the symphony of urban life plays on a continuous loop. The cacophony of traffic, the rhythmic hammering from construction sites, and the occasional crescendo of a siren can disrupt the tranquillity of our homes. In the UK, where urban dwellers are increasingly seeking refuge from the relentless noise, finding […]

Published on November 3, 2023 11:12 AM

Introduction Windows are our view to the world, but they’re also a place where dirt and grime collect, both on the glass and the frames. While there are numerous cleaning products available, many can be harmful to our health and the environment. So, how can we keep our windows sparkling clean while staying green? From […]