How much does it cost to have my windows defogged vs. replaced and is it cheaper to have my double glazed units de-misted than replaced ?

Yes - On average double glazing companies charge around £150 per square meter for replacement units. The company sends a surveyor out to measure up for a new unit, provides you with a quote and if you decide to accept it, takes payment. A few weeks later the company sends out a fitter to replace the failed unit, tipping the old one into a skip or landfill. The company would usually offer you a 5 Year guarantee.

Our process is not only cheaper but much more convenient for you. You receive your fixed price quotation either ‘on line’ or by phoning our customer contact centre on 08459011456. Once accepted we send a technician to your property at an agreed time and date and complete the work there and then. Most misted units are repaired in less than 20 Minutes, without removing them from their frames and with no waste glass to dispose of.

Typically our process saves you 50% against replacement costs and in all instances comes with a 10 Year warranty.

How long has your double glazed unit repair service been around?

Crystal Clear Window Works has been successfully repairing double glazed units since 2009. Over this period we have repaired tens of thousands of failed or misted units. In 2017 we repaired just over 20,000 units nationally and we are on course to exceed this in 2018. Our customers vary from private homeowners, letting agents to large property companies such as Sanctuary Housing the largest housing landlord in the UK and for whom we have been successfully de-misting double glazed units since 2015.

Does your double glazed unit repair process work on all windows?

Our failed unit repair process does not work on ‘toughened glass units sat in timber frames’. When our customer service advisers call you, or receive a call from you, they will check the frame type and where it is identified as timber, they will ask you to check for toughened glass markings on the double glazed unit. Most double glazed units are not toughened. Where toughened glass in timber frames is identified, we will advise you to make arrangements to replace the unit.

Does this process work on windows in a conservatory roof?

Unfortunately not, but please contact us and we can discuss your specific requirements.

Can the system handle visible oxidation (staining) or damage to a soft coat Low-E caused by the seal failure?

Yes, we have very good success with low-e units that have simple condensation or fog. We need to test the coating and be careful with our solutions but we can remove the moisture, and more importantly prevent any further degradation of the coating and therefore extend the life of low-e coated windows for a very long time. If the coating has started to erode, slough, oxidize or deteriorate - which usually first occurs around the entire perimeter of the IG at the spacer bar - the best that we can do is to remove the moisture based debris and staining. The key with low-e IGs is to get them early and perform our process as a preventive maintenance measure on the other IGs where evidence of coating degradation has yet to present. Our objective is to stop any further damage to the coating resulting from the moisture trapped in the air space. Our process will prevent damage to the other IGs and restore insulation value in all the IGs were we perform our service.

Does this work with the single glazed windows?

No, Single glazed windows do not need venting like this. The condensation on these windows forms because the humidity in the house is too high relative to the temperature of the glass.

Can your system clear a gray-silver film on the inside of my sliding glass door?

The patio door will have to be seen by one of our technicians. It is possible that you have chemical fogging or some stage 1 corrosion.

Can your process be used for double pane windows containing shades or blinds in between the glass?

Yes, we are able to apply our process with windows that have internal blinds.

Does your process clean the inside glass as well as dry it out?

Yes, our process will dry the window and remove early stage damage.

How long does it take after the service is completed, for condensation in windows to be cleared.?

There is no exact answer as to how long it takes for condensation in windows to clear. . Typically most double glazed units clear perfectly within a few weeks and all should clear within 6 weeks. This ‘drying time’, as we call it, can vary depending upon the weather and also how the window faces the elements.

Does your washing process eliminate the mold build-up between the panes of glass?


Does window cleaning and cleaning chemicals have a harmful effect on the valves you install?

No, normal window cleaning will not affect our process. You should however exercise caution when cleaning around the valves and seals.

Can I get a quotation over the phone or is it just to be done ‘on line’?

You are welcome to phone our contact centre on 08459011456 to discuss your individual requirements with one of our customer service advisers. Our on-line quote and ordering system is provided as an alternative should you wish to use it.

Is the online ordering system simple?

We have made our quotation and ordering system as simple as possible – All we need is your name, address, most used telephone number and the following information:

Number of double glazed units less than 2m2 in surface area. (Length x Height). These are SMALL windows

Number of doble glazed units greater than 2m2 but not greater than 4m2 in surface area. (Length x height) These are LARGE windows.

Please note a telephone quotation is required for all windows over 4m2 in surface area.

Type of house – if a flat please state what floor you are on.

That's all we need to know. Once you have put the number of small and large windows in to the ‘web estimator’ you will receive your fixed price quotation.
Once you have your quotation you can accept the quote and go to ‘place order’ or phone our contact centre on 08459011456 to discuss your quotation and place your order.

If you decide to ‘place order’ on our web site you will receive an electronic order confirmation.

From placing my online order how long does it take to complete the work?

Our customer contact centre will make contact with you within 3 working days of you placing an order to arrange an appointment with you for the works to be completed. Subject to your availability all works will be completed with 10 working days of an appointment being made.

Do I have to pay any money upfront before the work is carried out?

No: All we ask is that when we attend your appointment you have the means to pay our technician in line with the order. This can either be by cash, cheque or bank transfer. Please advise our technician if you intend to pay by bank transfer as this needs to be cleared by our office.

What do I do if I want to cancel my order?

Simply call our customer contact centre on 08459011456 with your name and address and your visit will be cancelled. Please try and provide us with 48hrs notice before your appointment date.

What happens if you turn up and some of my windows cannot be done because they are either very badly stained or are toughened glass units in timber frames?

In these circumstances we will complete what we can in accordance with your order and then present you an alternative  price for the replacement of those double glazed units  which we cannot do. There will be no obligation at all for you to accept our alternative quotation for the replacement of any double glazed units.

Does the restoration process work immediately?

No: the restoration process takes approximately 6 weeks to fully work. The size of the windows and their location will determine whether they take 2 weeks or 6 weeks to fully restore.

Can you get rid of staining in my windows?

Internal pane staining  can be removed because it is normally associated with minerals carried in the condensation and being deposited on the internal surface of the glass units. We can remove this using our specialist cleaning solutions. Major staining however, caused by many years of condensation between the panes can be more difficult to remove. This occurs rarely and our technician will advise if this is a problem when he attends your appointment.

What happens if the repair process does not work after a period of 6 weeks?

On the rare occasion that condensation in windows is still occurring after a period of 6 weeks then a simple call into our contact centre will trigger a re-check visit. Our technician will attend your property and inspect the work and complete a ‘retreat’ if required. If the remedial work does not solve the problem then you will be offered the option of a replacement upgrade (quote provided before we repair) but you will only pay the difference between the quoted double glazed unit replacement price and the amount already paid for the de-misting element.

Do you have to remove the double glazed unit to de-mist it?

No: all our repair work can normally be completed with the window in-situ and it does not have to be removed from its frame.

Do you need access into my property to complete the work?

No: All our work can normally be completed from either inside or outside of the property.
We only usually work from the inside when we are unable to access the window from the outside by a ladder. So for all flats located above 3 stories and for windows that have obstructions below them restricting ladder access, we complete the work from inside the property.

I have multiple double glazed units with condensation in windows to be restored at my property. Will I get a better on line price for the work than if I only had 1 window?

Yes – Our estimating mechanism built into our website calculates the quotation based upon the number of windows and their size category ‘small’ or ‘large’.
Discounts are automatically applied for multiple repairs.


Nationwide service

A Sustainable service

A sustainable service with no waste glass to landfill An environmentally friendly service reducing the production of ‘greenhouse gasses’