Double glazing is a popular choice for homeowners looking to improve the energy efficiency, security, and aesthetic appeal of their homes. However, with so many options available, it can be challenging to know how much to expect to pay for quality double glazing products from an established company.

In this guide, we’ll take a closer look at double glazing costs, including factors that affect the price, types of products available, and a comprehensive cost guide to help you make an informed decision about your investment.

About Realistic Home Improvements

Realistic Home Improvements have been committed to providing the highest quality double glazed products, installed by professional tradesman into the homes of our 1000’s of satisfied across Devon and Cornwall since 2009.

We offer a range of products, including PVCu, Aluminium and Timber - Windows, Doors, Conservatories, Orangeries and Solid Roof Conservatory Conversions. All our products are engineered using the high-quality materials before being installed by our team of expert installers.

FENSA registered, Which Trusted Traders and Ultraframe Approved installers are accreditations that give our clients peace of mind when it comes to investing in new upgrades for their home.

Why Invest in Double Glazing?

There are several benefits to investing in new double-glazing products for your home.

Energy Efficiency – Modern Double glazing contributes to reducing your energy bills by improving the insulation of your home. A+ Rated double glazed sealed units are over twice as thermally effective than double glazing of yesteryear.

Security – Double the glass, double the protection. Double Glazed units are harder to break than single panes of glass due to the construction of the unit. Having to smash a glass unit to gain entry can deter intruders from even trying as the excessive noise will draw unwanted attention.

Noise Reduction – Upgrading your singe paned windows to double glazing will make a major difference in reducing external noise pollution into your home. Acoustic double-glazed units which combine varying glass thickness that change the noise frequency as it penetrates through the sealed unit before entering your home. Ask us more about this if you live close to a train line, busy road, or an airport.  

Factors that Influence the cost


The larger the window or door, the more it will cost. The size of the glass and location of the glass also determine what type of glass will be required, such as will it require toughening or should 4mm, 6mm or 6.75mm laminated glass be specified.

Product materials 

The material composition will alter the cost affect the cost PVCu which is the most popular system will be the lowest cost followed by Aluminium.

Not all PVCu windows and doors are the same, in the last decade Flush Sash Timber looking windows, such as Residence Collection have become available with a vast array of colour and traditional furniture options.  


The style and design of your products will affect the cost. Casement windows are less expensive than Victorian Sliding sash windows. You can add your own personal touches to the products such as the number of vents to control ventilation or add Georgian inserts, various leading options as well as stained glass overlay to add character to your home.


Gone are the days when you could only pick white or stained timber looking PVCu windows, today we have over 22 colour options available to our customers individual needs – In the last decade Anthracite Grey windows have become incredibly popular, as well as Chartwell Green, Agate Grey, Cream and White Woodgrain to name a few.

Double Glazing Cost Guide

We are unable to provide a complete product cost guideline for all the products and options available, but we hope that the costings below will give you a good idea as to what to budget when replacing.

Windows Cost A+ Rated, Trickle Vent, Surveyed, Fitted, FENSA registered, and Including VAT

Single side opening casement window

White PVCu from £700.00


Double side opening casement window

White PVCu from £1,000.00



Vertical Sliding Sash opening window

White PCVu from £1,000.00


French Doors

White PVCu from £2,000.00


Patio Sliding Doors

White PVCu from £2,500.00


Prices will increase mainly due to inflation at a rate of around 4-6% compounded annually. 



Q: How long does it take to install double glazed products?
A: The installation time will vary depending on the size and complexity of the project. On average, we look to install windows a day, a single door ½ a day, with larger patio and bi-folding doors a day a piece.

Q: What is the warranty on double glazing products?
A: Realistic Home Improvements, provide individual products warranties with some component parts up to 10 years.

Q: Can double glazing products be repaired?
A: Yes, in most cases, double glazing products can be repaired but it’s often more cost-effective to replace the product.

If you’re interested in learning more about our exciting product ranges, contact us today on 01752 841008 to schedule a free consultation.

Remember to “Make us 1 of you 3 Quotes” and find out why Realistic Home Improvements are so highly recommended.