Sash windows restoration Double glazing retrofit

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We are a team of joiners, decorators and experts in wooden windows restoration. We renovate and upgrade wooden windows since 2008. 

  • 500+ Happy
  • 8 Years Paintwork Guarantee
  • 20 Years on Repaired Parts
  • Google Rating
Please Note:

Our minimum order quantity is 15 windows.
We do not work as an emergency call-out repair service.

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What сustomers say

Our wooden windows restoration services

Chameleon specialises in wooden windows restoration. We combine premium materials and a love of both traditional and pioneering wooden windows restoration methods.


Repair timber frame

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  • Decayed  window sills

    Decayed window sills

  • Rotten beading

    Rotten beading

  • Partially decayed frame

    Partially decayed frame

  • Loose putty

    Loose putty

  • Cracked  glass pane

    Cracked glass pane

Our skilled team of craftsmen can repair your rotten wooden window frames, replace rotten sash windows sills and have them looking good as new once again. Repairing wooden frames is an essential step in window renovation that can be done prior or together with other services. With regular timber frame maintenance, your windows can be fully functioning for many decades.


We can also repair windows that you may think are not repairable, which make our service a great alternative to window replacement. We also believe that window restoration is better for the planet and is a more sustainable choice.


We work with windows in Grade 2 listed properties as well old windows in regular buildings. For your peace of mind, our timber frame repairs come with a guarantee.


Functional restoration

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  • Unblocking stuck or painted shut sash windows

    Unblocking stuck or painted shut sash windows

  • Broken or snapped cord replacement

    Broken or snapped cord replacement

  • Sash window weights rebalancing

    Sash window weights rebalancing

  • Pulley replacement

    Pulley replacement

  • Restrictors and stops installation

    Restrictors and stops installation

Rotted frames or cracked paint may not affect your immediate comfort as much as stuck sash or sash that does not stay open or closed due to failed mechanisms. That is why it’s important to restore the functionality of your windows while repairing frames and upgrading glass.


Sash windows operate on a weight and pulley system that creates a counterbalance with the window, allowing smooth movement between its open and close position. Consequently, any issue with the weight or pulley can make the sash window tricky or even impossible to open. For tasks such as this or any other restoration work that your windows may need, our team will have them fully functioning once again.


We do not operate as an emergency call-out service, but we can repair cords or pulleys as a part of a timber frame restoration or double-glazing installation project.


Improved energy efficiency & noise reduction

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  • Improved energy efficiency

    Improved energy efficiency

  • Replace single glazing with double glazing

    Replace single glazing with double glazing

  • Reduce noise in half with new double glazing

    Reduce noise in half with new double glazing

  • Reduces cold draughts and rattle

    Reduces cold draughts and rattle

  • Improve windows security

    Improve windows security

Old windows can now be upgraded to match modern time living comfort standards. Window restoration and upgrade work offer a whole host of benefits to your property.


By upgrading your single glazed windows to double-glazing, your home can be more energy-efficient, secured and your heating bills can be reduced. Furthermore, double-glazing can cut outside noise in half by windows soundproofing, which is fantastic for houses on busy streets, and it can also improve your home’s security as it is far more durable than single glazing.

Our completed projects

    Double glazing Georgian sash windows with FINEO glass

    Double glazing Georgian sash windows with FINEO glass

    Renovation of 60+ windows in one of the most beautiful houses in Bluntisham, Cambridge

    Renovation of 60+ windows in one of the most beautiful houses in Bluntisham, Cambridge

    Vacuum double glazing installation

    Vacuum double glazing installation

    Windows refurbishment in Care home – Old Vicarage Care Home, St Neots

    Windows refurbishment in Care home – Old Vicarage Care Home, St Neots

    Sash Window Refurbishment in Hertfordshire

    Sash Window Refurbishment in Hertfordshire

    Sash windows restoration in Suffolk

    Sash windows restoration in Suffolk

We renovate all types and styles of casement and sash windows

Windows in Grade 2 listed properties

Windows in Grade 2 listed properties

Those living in Grade 2 listed properties no longer have to sacrifice modern technology to preserve historical appearance.

With ultra-thin double glazing that is suitable for conservation properties, we can upgrade your windows to provide a modern level of comfort as well as carry our like to like repairs on their timber frames.


Before & After rotten bay window frame repair


Timber window sill replacement


Curved sash window repair

Why choose us

  • In-House TeamIn-House Team

    We do not hire temporary staff. Each member of our team has been thoroughly trained and has been working with us for many years.

  • Since 2008Since 2008

    We have been in the business for over a decade, and we’re here to stay.

  • InsuredInsured

    Our insurance cover is 5m

  • Full ServiceFull Service

    From glass installation to paint finishes – we cover everything. So, when planning renovations, you can rest assured that your timber window work is fully covered.

  • GuaranteeGuarantee

    We have complete faith in our products and services and truly care about providing a fantastic job that our customers are happy with. This is why we offer a comprehensive guarantee to ensure customer satisfaction.

  • Family Run BusinessFamily Run Business

    Just like building a family home fit for a future generation, we have built a sustainable family business.

  • Fixed Timeframe Fixed Timeframe

    You don`t have to worry about any scheduling issues, as when we give you a quote, we provide a specific timeframe for the project to be completed.

  • InnovationInnovation

    We are constantly upgrading our tools to ensure that we provide a state of the art job with tailor-made equipment for the project at hand.

Our reviews

We pride ourselves on delivering a high-quality job that our customers will be delighted with. Don’t just take our word for it, have a look at what our clients and customers have said about our services.

Really pleased with our windows! Prompt and helpful communication, extremely hard working team and a great looking (and hopefully better functioning) end result. Thank you!

Vanessa Nash

Alex and the team have restored our 20 year old sash windows so they look brand new. The team worked non-stop to complete it and made sure everything was to an excellent standard. Thank you.


We’re very happy with the work we recently had completed on the windows. It was also done in great time, with the guys coming nearly every day, including weekends – absolute grafters. Thank you, our windows look great!

Sarah Mayne

We had an excellent experience with Chameleon Decorators. The work was completed on time and to a very high standard throughout, all at a fair price. Would have no hesitation in providing a recommendation. Please note that the team work on the exterior only so you will need to factor in an internal job also!

Oliver Taylor


Very pleased with the results, very professional service. Would recommend.

Stephen Mcmullen

Excellent communication, service and professionalism. We spoke with Chameleon to restore some rotting wood french doors and wooden windows, as well as redecorate. We’d use them again without hesitation and would thoroughly recommend them.

Jamie Newman

Alex and his team are superb. We have used them before, and always been impressed – as we were this time – by their work ethic, their expertise and knowledge, the quality of their work, and their efficiency. I recommend them very highly indeed.

Emma Goddard



How much will it cost to renovate my sash window?

Sash window restoration work starts at £500 per window. The cost will depend on a number of factors such as the size of the window, whether it requires glass or sill replacement, draught-proofing installation, functional restoration etc. The cost also depends on the number of windows and access to them. If you live in a busy high street with limited access to the windows, the cost per window will be significantly higher.

What is the lead time to get the exterior window renovation work done?

Generally speaking, a 15 window project will take us 5-7 days.

Do you repair windows on Grade 2 listed buildings?

Yes, we regularly work with Grade 2 listed buildings and conservation area properties. We do like-for-like timber frame repairs. They do not require planning permission as we do not change the look of the windows.

Can you install double glazing into the existing timber window frames?

Yes, we can remove old single glazing and replace it with ultra-thin double glazing.


Wooden windows renovation and upgrade enquiries

Contact us now to obtain a Free, No-Obligation Quotatio