Double glazing is a valuable investment for homeowners in the UK, not only for its role in insulating homes from the often-unpredictable British weather, but also for improving security and reducing noise pollution. Understanding the costs involved in installing double glazing is essential because it allows for better financial planning and ensures you receive value for your money. Double-glazing prices can vary widely based on factors like the material, the number of windows, the glazing type and the complexity of installation.
We’re here to cover all aspects of double-glazing costs in the UK, highlighting average prices, benefits such as improved insulation and security, and tips to find the best window fitter for your project.
We'll cover the following topics in this pricing guide:
- Average double-glazing costs
- How much does a double-glazing fitter cost?
- Double-glazing cost calculator UK
- Double glazing cost per m2
- Double glazing cost per window
- Double-glazing replacement costs
- How long does double glazing take?
- How to reduce double-glazing costs
- FAQ
- Your double-glazing checklist

Average double-glazing costs
In the UK, the average cost for double-glazing windows ranges from £100 to £300+ per window, with variations depending on size, material and whether you opt for a standard or custom design.
The average cost of installing double glazing in an entire house is approximately £4,500. Keep in mind that investing in high-quality double glazing can lead to long-term savings on energy bills, making it a cost-effective choice for a cosy, energy-efficient home.
Remember, these prices are only an average and are affected by various factors, such as the window type and size, location and the labourer’s skill and expertise. And be sure to always compare quotes from reputable suppliers to ensure you get the best deal.
Job | Average material cost | Labour cost |
---|---|---|
Flat with uPVC casement 4 windows | £1,300 | £300 |
House with 8 uPVC casement windows | £2,500 | £500 |
House with 10 uPVC casement windows | £3,000 | £600 |
House with 15 uPVC casement windows | £4,500 | £750 |
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How much does a double-glazing fitter cost?
The cost of hiring a double-glazing fitter in the UK can vary based on the project’s scope, regional labour rates and the fitter's experience and expertise. Typically, window fitters charge between £25 and £35 per hour or around £200 to £280 per day. Some fitters may charge per window.
When it comes to larger projects, such as fitting an entire house, prices may be quoted on a job basis rather than per window, hour or day. Most tradespeople typically charge a minimum of half a day’s rate for any job though, so keep this in mind if you have a quick job, such as installing a small window.
Remember that your location can cause the price to vary. Living in London or close to the city means the average window fitter will likely charge more due to their increased living costs, while prices in the north of the UK may be more affordable.
While hiring a professional double-glazing fitter may seem expensive compared to a DIY approach, numerous benefits often offset this cost. Professionals bring expertise in ensuring a precise and safe installation, which is essential for optimal thermal efficiency and functionality. They can also provide valuable warranties, guaranteeing their work for added peace of mind. Plus, a professional's experience allows them to foresee and manage potential complications, saving you time and additional costs in the long run. By employing a certified fitter, you also benefit from their knowledge of the latest products and regulations, ensuring a high-quality finish and compliance with building codes.
When choosing a fitter, it's important to look for experienced professionals who can provide references and a portfolio of completed work to ensure quality installation.
Double-glazing cost calculator UK
Calculating the cost of your double-glazing project involves considering both material and labour expenses.
Here's a step-by-step guide to help you estimate costs:
- Measure: Determine the size of each window in square metres to understand the required amount of glazing.
- Material costs: Estimate costs using average prices (£100 for small, £200 for medium, £300+ for large windows) and multiply by the number of windows needed.
- Labour fees: Factor in the fitter’s rate, which can vary by region but averages between £25 and £35 per hour or £200 to £280 per day.
- Additional costs: Consider costs for any special features like frame colours, openings, or window types (e.g., sash, bow, bay).
- Total estimate: Combine the material and labour costs for an approximate total. For example, ten medium windows may cost £2,000 in materials, with labour at £600, totalling £2,600.
- Contingency: Include around 10 to 15% contingency for unexpected costs.
Always source detailed quotes from suppliers and fitters for accurate pricing and remember to check if VAT is included.
Double glazing cost per m2
Double glazing costs per square metre are primarily influenced by the size of the windows. Smaller windows, often found in bathrooms and typically less than one square metre, might be from £100 per window. Medium windows, typically placed in bedrooms and ranging from one to two square metres, could cost approximately £200 each. Larger windows, common in spacious living rooms and often exceeding two square metres, can see costs starting at £300 or more per window. Larger windows require more materials and labour, hence the higher price. These prices reflect the cost of materials alone, and additional charges apply for installation and any special features.
Double glazing cost per window
The cost of double glazing per window can vary, depending on size and style. On average, you might spend around £100 for a small, £200 for a medium, and £300 for a large standard uPVC casement window, excluding installation. For example, if you require nine windows, with five large and four medium, material costs alone would be approximately £2,300, plus delivery. Know that purchasing directly from a double-glazing company will likely increase the price, as opposed to sourcing them through a professional window fitter you’re working with.
Keep in mind that these estimates apply to standard white uPVC. Choosing coloured frames, additional openings or decorative features, such as Georgian bars, can significantly increase costs. Speciality windows like sliding sash or bow/bay designs will also have a higher price point, especially as the number of panes increases.
Double-glazing replacement costs
Double-glazing replacement costs vary depending on the situation. For older homes upgrading from single to double glazing, prices will include removing old windows and installing new units to boost energy efficiency. If existing double glazing is damaged, replacing just the sealed units while keeping the frame intact is possible. In this case, each replacement typically takes about 45 minutes. Replacement costs range between £200 and £500 per window, with more intricate designs potentially costing more due to complexity.
Double-glazing cost by colour
The choice of colour in double glazing frames can significantly influence the overall cost due to additional manufacturing and finishing processes. White uPVC frames are a standard option, favoured for their cost-effectiveness and straightforward production. The price for a fully fitted white uPVC window typically ranges from £200 to £450, while supply-only may fall between £100 and £260.
Opting for grey frames, which add a modern and elegant look, can increase the cost. This colour often requires more complex manufacturing processes and can add an additional £50 to £100 per window, affecting both fitted and supply-only prices.
For those seeking a custom colour scheme, be prepared for potential extra costs. Some suppliers may offer coloured frames at comparable prices to white, but others could charge up to 15% more due to the specialised mixing and coating processes required to achieve non-standard colours. Always check with suppliers, as pricing strategies can vary.
Upgraded double-glazing glass costs
Considering an upgrade to your double-glazing glass can bring additional benefits, such as enhanced security and noise reduction. Upgrading to tougher materials like polycarbonate glass can provide better theft prevention, with an additional cost of about £30 to £160 per window. For those living near busy streets, soundproof glass is an excellent investment to create a more peaceful home environment. The cost for soundproof glass, including supply and installation, can range from £800 to £1,900.
Cost of re-plastering
It's common to require some plaster work around the new window reveals due to the removal of the old frames. Typically, a good installer will include this as part of their service. However, it's important to check your quotes thoroughly to ensure minor repairs like these are covered. If not included, you may need to budget for a plasterer, which can cost around £300 for a day rate, depending on the extent of the plastering required. Again, it’s always important to clarify responsibilities up front to avoid unexpected expenses after your double-glazing installation.
How long does double glazing take?
The installation time for double glazing can vary, but typically, a professional team can replace and fit a new double-glazed unit in approximately 45 minutes. The process usually spans one to two days for a whole house, with potentially an extra day for final touches, like applying trims.
The duration for fitting double glazing hinges on several factors, including the size of the team, the number and style of windows, and site-specific conditions, such as accessibility. A standard three-bedroom semi-detached house generally requires about two to three days if it has easy access and no issues. Pre-installation surveys are often conducted to measure and prepare the windows, streamlining the on-site work and reducing disruption to your routine.
Job | Duration to complete |
---|---|
Flat with uPVC casement | 4 windows one day |
House with 8 uPVC casement windows | one to two days |
House with 10 uPVC casement windows | one to two days |
House with 15 uPVC casement windows | two to three days |
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How to reduce double-glazing costs
To reduce the costs associated with double glazing, consider the following tips:
Source multiple quotes: Shop around and request several quotes to compare prices and services. We recommend sourcing at least three.
- Choose standard sizes: Custom window shapes and sizes tend to be more expensive, so opt for standard sizes if possible.
- Ask for seasonal discounts: Enquire about discounts during off-peak seasons when demand is lower.
- Try partial DIY: If you have the skills and confidence, you can remove the old windows yourself or prepare the site for installation. However, unless you have the expertise, always have professionals install the glass.
- Apply for government grants: Research and apply for government grants or local schemes that offer support for energy-saving home improvements.
- Quality over quantity: Invest in high-quality, energy-efficient windows that will save you money in the long run by reducing heating costs.
- Reuse materials: If applicable, reuse any salvageable materials from your old windows.
- Negotiate trims and finishes: Sometimes, simple finishes can be done yourself or negotiated within the fitting cost.
- Look for bulk deals: If you have a large project, like double glazing an entire house, ask for a bulk buy or discount.
- Search for energy efficiency rebates: Some companies offer rebates for installing energy-efficient windows.
FAQ
Do I need planning permission for windows?
Typically, you won't need planning permission for replacing windows in your home, with some notable exceptions. If your property is a listed building or located within a conservation area, special considerations apply due to the historical and architectural significance of such places.
Flats and homes previously under council ownership may also be subject to different regulations, often to maintain a uniform appearance. To ensure compliance, it's always wise to contact your local planning authority before starting work. They can provide guidance specific to your situation, helping you to avoid potential legal complications and ensuring that your project meets all the necessary regulations.
What types of double-glazing frames are best?
When selecting the best double-glazing frames for your home, consider the material as it impacts durability, maintenance, thermal efficiency and style. uPVC frames are a popular choice due to their affordability, low maintenance and good insulation properties. They come in various colours and finishes, including those that mimic the appearance of wood.
Timber frames offer a classic and natural look, and they provide excellent insulation and eco-friendliness as they’re made from renewable materials. However, they require regular maintenance to prevent warping or rotting in the long run.
Aluminium frames are known for their strength, slim profile and long-lasting finish. They can support larger panes of glass due to their robustness, making them ideal for contemporary designs, although they are usually more expensive than cheaper options like uPVC.
Steel frames are the strongest and most durable option, often used in commercial buildings. They can last a lifetime with proper care, but they are the costliest and can be less thermally efficient than other materials unless properly treated.
What are some types of double-glazed windows?
Double-glazed windows come in various styles to suit different functional requirements and style preferences. Single hung windows feature a fixed top sash with a movable bottom sash that slides vertically, for a classic look with improved ventilation control. Double hung windows enhance this design by allowing both the top and bottom sashes to move, for better airflow and easier cleaning.
Casement windows are hinged at the sides and swing outward like a door, providing maximum ventilation and a clear view. They’re ideal for hard-to-reach areas due to their crank-operated opening mechanism. Like casement styles, awning windows are hinged at the top and open outward from the bottom, making them perfect for allowing air circulation, even during light rain. Sliding windows, as the name suggests, have sashes that slide horizontally and are excellent for areas with limited space outside since they don't protrude when open. Each window type offers distinct benefits, from ease of use to aesthetics, making the choice largely dependent on personal preference and the specific needs of the space.
Your double-glazing checklist
For a smooth and successful double-glazing project, we recommend following our handy checklist:
- Measure windows: Note the dimensions of existing windows or spaces.
- Research types: Decide on the type of double glazing you prefer for your home.
- Set budget: Determine your budget for the entire project.
- Obtain quotes: Collect multiple quotes from reputable fitters.
- Check credentials: Make sure a fitter is FENSA-approved
- Look at references: Verify any potential fitter’s past work and customer reviews.
- Confirm timescales: Agree on a timeline for the installation process.
- Plan for installation: Prepare the area for installation, ensuring clear access.
- Agree on details: Discuss and agree on the finishes and trims.
- Understand warranty: Clarify warranty terms for the double glazing.
- Post-installation: Plan for aftercare and any required maintenance.
Finding a reputable and qualified window fitter is easy, free and quick with MyBuilder. Simply post your project details on the MyBuilder platform, and anyone who is suitable and has the right experience can reach out to you.