TrustMark is a non for profit organisation which is licensed by Government and supported by various consumer protection groups.

TrustMark endorses local, ethical companies in a variety of trades which work within Governmental approved standards and guidelines.

The good news is that there is no cost to the consumer in using a TrustMark registered company. TrustMark credit checks all companies before joining their scheme so you can be confident you are dealing with a financially sound double glazing installer or home improvement company.

High Standard of Workmanship

Members are expected to perform to the very highest standards of workmanship as set out against recognised British, international and industry standards.

As a result, TrustMark carry out regular checks on their companies through their approved Scheme Operators which include a range of organisations such as trade associations, local authorities and trading standards.

The TrustMark Core Criteria

The TrustMark Core Criteria is reviewed and updated each year – this is an 18 page document setting out the standards TrustMark accredited companies must operate to.

The document includes:

  • Scheme Operator’s organisation
  • Members Code of Practice
  • Members assessment and monitoring
  • Customer care
  • Disciplinary processes
  • Warranty protection
  • Branding & communication
  • Monitoring by TrustMark Board

Why Choose A TrustMark Tradesman?

All TrustMark traders work to a code of practice set down by an approved Scheme Operator to give you greater confidence and protection. Registered firms are checked and monitored against recognised British and International industry standards which means you have peace of mind that you are dealing with a professional organisation.

Checked and Vetted

Before a company is even accredited with the TrustMark logo, they go through a series of stringent checks. Their record and financial position are investigated and once accepted, they continue to be independently checked through regular on-site inspections. This is to ensure that all members continue to meet a high standard of workmanship, quality and service.

Code of Practice

When companies sign up to TrustMark they must agree to work to a code of practice that includes insurance, good health and safety practices as well as customer care. The approved scheme operator will continue to monitor a member’s quality of work, trading practices and customer satisfaction for as long as they are a member of the organisation.

Avoid Rogue Tradesmen

If a double glazing company displays the TrustMark logo you know that they have been approved and inspected through a scheme operator. All accredited companies as part of the scheme are required to meet current UK Building Regulations.

Insurance Backed Warranty

All company members must also offer consumers an insurance backed guarantee or warranty. This is extremely important since this insurance policy covers you against certain problems if the firm should ever go out of business.

Each accredited company will offer a different warranty (depending on the product and type of installation) through their chosen scheme operator but TrustMark dictates that the warranty must at least cover the following points:

  • Pre-payments
  • Quality of Workmanship
  • Rectification of defects or major damage
  • Non-compliance with Building Regulations

The warranty offered must be designed for the individual home owner and it is a requirement that it covers most jobs between £500 and £50,000. The duration of the insurance cover must be a minimum of two years – longer subject to trade.

Deposit Protection Insurance

All TrustMark Tradesmen must offer some form of deposit protection insurance for their customers. This is to ensure consumers are protected in case of a company ceasing to trade.

Government Supported

The TrustMark scheme is fully supported by the Government, the building industry and consume protection groups so you can have complete peace of mind whenever you choose one of their accredited installers.

Double Glazing on The Web Recommended

If you are considering replacing your windows or doors or carrying out other home improvements to your property then it is very important that you choose an accredited company. At Double Glazing on The Web, we ensure that each of our trusted suppliers and installers are registered with appropriate industry regulatory and accredited bodies.

If you would like us to put you in touch with an accredited company local to you, then please call us on freephone: 0800 015 5679

Frequently Asked Double Glazing Questions

Frequently Asked Double Glazing Questions

Are Double Glazed Windows Good For The Environment?

Once of the best ways of making your home more energy efficient is insulation. Double glazed windows act as another layer of insulation, helping to prevent the loss of valuable heat.

If I Use Double Glazing on the Web Who Will Fit My Double Glazing?

Double Glazing on the Web have a fully accredited network of local installers. Once you have created your free online quote we will put you in touch with up to three reputable local suppliers. Each of these suppliers will offer you a free no obligation quote and who you choose is completely up to you.

How much is double glazing per window?

Double glazing prices per window can vary from around £150 to £600 depending on the specification. The window style, type of glass, frame colour and handles are all contributing factors. To find out the true double glazing price per window it is a good idea to get a number of quotes to compare.

What is the average cost to double glaze a house?

The average cost to double glaze a house will depend on the size of your house and the number of windows. To double glaze a flat or apartment it will probably cost around £2,000. The average cost to double glaze a house is usually between £4,500 to £7,500. If you collect a number of double glazing quotes you will be able to compare companies and prices.

Is double glazing expensive?

Double glazing can be an affordable addition for many homeowners. The price you pay can depend on the quality of the windows and the energy ratings. Other factors are the style of the windows, the colour of the frames and the type of glass. Why not get an online double glazing quote to get an idea of the price.

Is double glazing easy to break?

Double glazing is a strong option for windows compared to single glazing. The frames are durable and there are high security locking options. As double glazing is made from glass it is possible to break however you will have to exert quite a bit of force to do this. This is practically impossible to do without making a noise.

What Does Double Glazing Do?

Double glazing makes your house more energy efficient, keeping heating in and keeping the cold out during winter months. During summer months, it helps keep the hot air out, keeping your house cooler. It also works to insulate sounds from busy areas and roads, leaving your house more peaceful and quieter.

Does Double Glazing Block Sound?

Double Glazing not only provides heat insulation but it also provides sound insulation too. Double glazing is perfect for houses in busy areas and streets.

How Do I Know If My Double Glazing Needs Repaired?

There are four tell-tale signs that your double glazed windows need repair or replaced: There are chips and cracks in the panes of glass; there is condensation (misted windows) between the two panes of glass; the window allows cold air through; water begins to seep through the frame. If your double glazing does any of these things, you may need to get your double glazing repaired or replaced.

Is uPVC Flammable?

No, uPVC isn’t flammable and is actually a fire retardant.

What Can Cause Double Glazing To Crack?

Double glazing can crack for what appears to be no particular reason at all. A sealed window unit faces constant pressure either side of the glass, however, most of the time double glazing is strong enough to deal with this. Winter can be one of the worst time for cracked glass as the difference of temperature on either side of the glass stressing it to the point it can crack.

Should I Double Glaze My Windows?

Double glazing works to make your house more energy efficient saving you money on your heating bills. Double glazing also provides sound insulation which is perfect if your house is situated near busy roads and noisy areas. Double glazed windows are also tougher and harder to break than single glazing windows making your house more safe and secure.

How Do I Know If My Double Glazing Needs Replaced?

Double glazing will need replaced after a while due to the nature of the design – the gas that separates the two window panes slowly leaks out over time meaning the energy efficiency of your window is compromised. If your double glazing allows cold spots; water to seep through the frame; has cracks or chips in the window or has a build-up of condensation between the two panes of glass (misted windows), you should probably look into getting your double glazing replaced or repaired.

How Long Does Double Glazing Last?

It is important to note that the argon gas that separates the panes of gas, giving double glazing its energy efficiency will eventually leak out overtime. Double glazing has an average life span of about 20 years, however, this can vary depending on materials used and the installation.

Is Double Glazing Worth It?

Double glazing helps make your home more energy efficient as it prevents the loss of heat. During the summer, it helps to keep the heat out of your home. It provides your home with sound insulation which is perfect for houses that are in busy areas and streets. Double glazing also makes your home safer and more secure.

Is Double Glazing Easy to Break?

No, double glazing is not easy to break which means your home will be more secure. When attempting to smash double glazing often what happens is that the first pane of glass and the second will remain intact. This is due to the argon gas working as a shock absorber. This will mean the smash is very loud but unsuccessful on the first attempt.

How much does it cost to install a window?

The prices given in our pricing tables, our online quotes and our costing calculators reflect the price of the window itself as well as the cost of installation. For example, a 500mm x 500mm casement window will cost between £150 and £175 including the cost of installation.

How much does it cost to double glaze a 3 bed house?

On average a double glazed window will cost between £350 and £400, with a uPVC door typically costing £600. This means that double glazing a 3 bedroom semi can cost between £3500 and £5000.

Should I replace my old sash windows?

Sash windows are a key feature for many traditional period buildings. Sash windows were traditionally built using timber, which is fairly high maintenance and has a tendency toward rotting and warping. Over time, these windows can become draughty and insecure. uPVC sash windows are a great way to experience the benefits of modern double glazing, without sacrificing the aesthetic of your home. uPVC sash windows will not rot or warp and require little maintenance. They are also thermally efficient, which means that your home will not require as much heating.

Double Glazing Cost Calculator