Double Glazing Installation & Repair Services
Glitz Windows & Conservatories Ltd installs and repairs high-performance double glazed windows and doors across South London and Surrey, backed by 25+ years of experience, a 10-year guarantee, and FENSA registration.
- FENSA Registered
- 10-Year Guarantee
- 25+ Years Local Experience
How Double Glazing Works
Double glazing uses two panes of glass separated by a sealed gap typically filled with argon gas, which acts as a thermal and acoustic barrier. Unlike single-glazed windows, the trapped gas layer dramatically slows heat transfer, keeping warmth inside in winter and heat outside in summer.
At Glitz Windows, every double glazed unit we install meets or exceeds current UK Building Regulations (Part L) and carries a minimum C Window Energy Rating (WER). A-rated units, which reduce heat loss by up to 50% compared to single glazing, are also available.
Benefits of Double Glazing
Lower energy bills
A-rated double glazing reduces heat loss through windows by up to 50%, cutting annual heating costs by £100–£175 for a typical semi-detached home.
Noise reduction
Double-layered glazing reduces external noise by up to 35 decibels — ideal for properties near busy roads, railways, or flight paths across Croydon.
Fewer draughts and cold spots
Double-layered glazing reduces external noise by up to 35 decibels, ideal for properties near busy roads, railways, or flight paths across Croydon.
Higher EPC rating
Replacing single glazing with A-rated double glazing can improve your home’s Energy Performance Certificate (EPC) rating by one or two bands, increasing its market value.
Reduced condensation
The warm inner pane of a quality double glazed unit stays significantly warmer than single glass, greatly reducing interior condensation and damp problems.
Low maintenance
uPVC and aluminium frames require no painting or staining — just an occasional wipe with soapy water. Designed to last 20–25+ years with no fuss.
Comprehensive Glazing Solutions for Every Property
If you require an entire house refurbishment or just a replacement of your double glazed windows due to damage, our services at Glitz Windows will suit you well.
Custom Glazed Windows and Doors
We do not follow the principle of “one size fits all.” We offer products ranging from traditional casement styles to sash windows for your property. If you want to connect your home to the garden space, our glazed doors, such as bifolds and patio sliding doors, are a good choice.
High-Performance uPVC Double Glazing
uPVC continues to be the preferred material among UK households and here’s why. It demands no maintenance at all and is highly durable and resilient to weather conditions. When calculating the uPVC double glazed cost, you must see the whole thing as an investment since this type of window improves your home’s value and needs only occasional cleaning with soapy water.
Double Glazed Glass Replacement
In some cases, you might have great frames, yet the “blown” or misted glass units are not working properly. Our double glazing installation services also offer glass replacement. We will replace any malfunctioning glass with better glass to improve your thermal performance without installing a whole new frame.
Signs your double glazing needs repair, not replacement:
Misted or “blown” glass
Cloudiness or condensation trapped between the panes means the seal has failed. This is one of the most common issues we’re called out for.
Draughts around the frame
Usually a sign the seal or gasket has worn down, not that the whole unit has failed.
Windows that won’t open, close, or lock properly
Often a hinge, handle, or hardware issue rather than a glazing problem.
Condensation on the inside of the room
Can point to a failing thermal seal rather than just humidity.
uPVC vs Aluminium Double Glazing
We work with both major frame materials. The right choice depends on your property style, budget, and maintenance preferences.
uPVC Double Glazing
- Excellent thermal performance
- Virtually zero maintenance
- Wide colour range including anthracite grey and woodgrain
- 20–25 year lifespan
- Most cost-effective option
- Suitable for most property types
Aluminium Double Glazing
- Ultra-slim sightlines — maximum glass area
- Stronger than uPVC — wider spans possible
- Ideal for contemporary and commercial properties
- Powder-coated in any RAL colour
- 25–40+ year lifespan
- Higher initial cost — premium aesthetic
Why Homeowners Choose Glitz Windows
Years of experience
Registered installer
Installation guarantee
Google rating
No-obligation survey
Double Glazing Frequently Asked Questions (FAQs)
How much does double glazing cost?
The price for double glazing is based on the size of the window, the type of material used (uPVC/Aluminum) and quantity. For the best possible quote, we suggest that you have a free survey conducted at your property.
How long does double glazing installation take?
An installation process that will cover an entire home may usually take anywhere from one to three days. However, installing windows and glazed doors will only take a few hours.
What is the lifespan of double glazed windows?
Good quality double glazing will last from 20 to 25 years on average. Nevertheless, with proper maintenance and expert installation from Glitz Windows, good-quality double glazing can function efficiently for much longer.
Can you repair misted or "blown" double glazing?
Yes. When you notice condensation between the panes, it means that the seal is broken. We have a solution for you – we replace your glazing with new double glazing, but keep the old frames intact.
How do I know if I need a repair or a full replacement?
If your frames are sound and it’s just the glass unit, seal, or hardware causing problems, a repair is usually enough and will save you money. Full replacement makes more sense if the frames themselves are warped, rotting, or more than 20–25 years old. If you’re not sure, our free survey will tell you exactly what’s needed, no pressure either way.
Does double glazing really reduce energy bills?
Certainly. With double glazing, the amount of heat escaping from your windows is reduced by 50% and as a result, the temperature on your thermostat can be turned down considerably.
Do I need planning permission for double glazing?
Normally, no permission is required for the replacement of your windows if similar ones are installed. Nevertheless, if you are living in a Conservation Area or a Listed Building, there might be special considerations.
Make Appointment
Get a free quote with no obligation - Contact us now
Have a unique idea or specific requirements? Our team specialises in tailored window and door solutions to suit your vision—built to exact specifications and installed with precision.
- 53 Chipstead Valley Rd, Coulsdon CR5 2RB
- info@glitzwindows.co.uk
- 020 3370 7955
- Mon-Fri 08:00 - 17:00
Make Appointment
Get a free quote with no obligation - Contact us now
Have a unique idea or specific requirements? Our team specialises in tailored window and door solutions to suit your vision—built to exact specifications and installed with precision.
- 53 Chipstead Valley Rd, Coulsdon CR5 2RB
- info@glitzwindows.co.uk
- 020 3370 7955
- Mon-Fri 08:00 - 17:00
Our Process
Four Steps to Order Window for Your Home
