Window Fitters in London (26)

It is often more budget-friendly to replace a glass pane instead of installing an entire new window. The average supply and installation cost for window glass replacement is £100. A new double-glazed casement window installation costs between £300 - £800.

Here are some average costs to consider when replacing a window:

• Single pane installation – £27.50
• Old window removal – £20 - £30
• Window fitter hourly rate – £25 - £35

Glass replacement is likely the best option if you're happy with your window’s overall performance and only the glazing has been damaged.

If you are dealing with any of the following issues, it is often more cost-effective in the long term to replace the whole window installation:

• Mould growth around the window / on the frames – Switching to more energy-efficient windows can keep your home warm and dry. Old frames are often unable to provide reliable protection against damp and heat loss
• Difficulty opening and closing – Wood rot, wear and tear and swelling frames can cause window functionality issues. You may be able to perform temporary DIY fixes, but often, a full window replacement will be needed
• Poor soundproofing – Improve your home’s soundproofing by replacing single-glazed windows with high-quality double glazing or triple glazing

Check out our expert guide on when to repair or replace a window for more advice.

FENSA (Fenestration Self-Assessment Scheme) is a government-approved scheme that ensures compliance with building regulations for replacement windows and doors in England and Wales.

Whenever you replace windows or doors in your property, it’s important to get a FENSA certificate to prove that the new installation:

• Complies with current building regulations

• Is energy-efficient

• Has been registered with your local authority

Benefits of a FENSA certificate

By having a FENSA certificate, you can:

• Ensure legal compliance – Rest assured that your home improvement project meets all legal requirements

• Increase your property value – A FENSA certificate can potentially boost your property's value

• Enjoy energy savings – Energy-efficient windows and doors can help reduce your energy bills

• Improve home security – Modern windows and doors can enhance your home's security

Want to know more about replacement windows? Check out our comprehensive guide to everything you need to know about replacing windows.

There are various ways to find a reliable window fitter in London. Here are some of our top tips to help you find the best person for the job:

• Use Checkatrade search – Our search tool helps you find verified window fitters who cover your area

• Look out for FENSA – Ensure your window installation meets building regulations by choosing a FENSA-registered fitter

• Check reviews and ratings – Look at reviews and testimonials from previous customers to gauge the quality of their work

• Request quotes – Get quotes from at least three different window fitters to compare prices and services

• Ask for customer references – Ask for references from previous customers to get first-hand feedback

• Ask relevant questions – Learn more about the fitter's experience and expertise by asking questions, either in person or over the phone

Questions to ask local window fitters in London

To get you started, here are some example questions you might want to ask your local window fitters:

• How long have you been fitting windows?

• Do you have experience with the type of window I need?

• Are you FENSA registered?

• Can you provide references from previous customers?

• How long will the installation take?

• What is the estimated cost of the installation, including parts and labour?

For more tips and advice, read our guide to finding the best window fitters in London.

Typically, it takes between 1-2 hours per window to install a standard-sized window – if everything goes smoothly.

The exact installation time will vary depending on the size and type of window, the complexity of the installation, and the number of window fitters doing the job.

For accurate estimates of the installation time, discuss your project with window fitters working locally to London.

Hiring an experienced professional window fitter can also help minimise installation time and ensure a high-quality finish.

No. As a general rule, you don’t need planning permission to replace windows in the UK – especially if you’re replacing like for like.

However, there are some exceptions where you might need to apply for planning permission, which include:

• The property is a Listed Building – If so, you'll need listed building consent to replace windows, even if they're like-for-like replacements
• You’re in a Conservation Area – You may need planning permission, especially if the new windows significantly alter the appearance of the property
• You’re creating new window openings – You’ll usually need planning permission for brand-new window openings in a property
• If in doubt, speak to your local planning office to confirm whether your replacement windows require planning permission.

Building regulations

Even if you don't need planning permission, your replacement windows will still need to comply with current building regulations.

The best way to do this is to hire a FENSA-registered window fitter to do the job who will have the skill and knowledge to comply with building regulations.

Ready to find reputable FENSA-registered window fitters working in London? Read our tips on how to find the best window fitters near you.

If they’re in good condition, you should be able to keep your old window frames.

However, it’s usually better to replace both the window frames and the glass together. That way you ensure a higher level of insulation and energy efficiency.

If you’re hoping to keep your existing window frames, here are some key points to consider:

• Condition of the frames – This will be one of the key factors that will dictate whether you can keep your old frames as they’ll need to be in very good condition
• Energy efficiency – Modern window frames are designed to be energy-efficient and often old frames just can’t offer the same efficiency
• Building regulations– You may find that your local building regulations require you to replace the entire window to comply with energy efficiency standards

The best way to find out if you can keep your old window frames is to speak with window fitters covering London.

Ahead of your window replacement, there are various steps you can take to prepare your home and ensure everything goes smoothly:

1. Clear the area around the window(s) both inside and outside

2. Remove any window coverings, such as curtains, blinds, or shades

3. Check for existing damage around the window frames that you might need to highlight to your fitter

4. Cover floors and furniture with dust sheets to protect them from dust and debris

5. Confirm your requirements with your window fitter to make sure you’re both on the same page

6. Be prepared for some disruption as window installations can be noisy and create dust and dirt inside and outside your home

   It’s also useful to check the weather forecast ahead of your window replacement. If the weather is particularly bad, it may delay the installation process.

Double glazing is extremely popular with homeowners in the UK, and for good reason. Here are some reasons why you might want to consider double-glazed windows:

• Improved energy efficiency that will see your property lose less heat in the winter and stay cooler in the summer
• Reduced noise pollution from outside sources, such as street traffic, passers-by and neighbours
• Better security – Modern double-glazed windows are often fitted with high-security locks and toughened glass that makes your home more secure
• Reduced condensation – Say goodbye to unwanted condensation, mould and mildew on the inside of your windows
• Long-term savings – The initial investment may be high but your long-term energy savings often outweigh the cost
• Choose a style to match your home – Double-glazed windows come in a variety of styles and finishes, so you can pick the perfect choice for your home

Want to know more? Check out our dedicated guide to double glazing.

A standard window installation involves removing the old unit, prepping the frame, and fitting a new energy-efficient window. A typical installation takes 1–2 hours per window, but this can vary depending on:

• The number of windows
• Window size and type (sash, bay, casement etc.)
• Complexity of access
• Weather conditions
• Number of installers working on-site

Currently, there is no UK-wide grant scheme for double glazing. However, some households may be eligible for support under:

• Local Authority Flexible Eligibility (LA Flex)
• The Great British Insulation Scheme
• Local council energy efficiency programmes

You can check with your council and energy supplier for any local schemes available to you.