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Breathe new life into your home with sash window restoration

At Ventrolla, our skilled craftsmen meticulously restore your original timber sash windows, preserving their beauty while ensuring smooth operation and improved insulation. If your original timber windows are draughty, rattling, or inefficient, we’re sure that our industry-leading renovation services can help restore period properties to their former glory. Our innovative techniques work to transform the world of renovation and restoration.

Features & benefits of sash window restorations

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Preserves authentic charm of traditional sash windows

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Expertly installed by Ventrolla technicians

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Energy saving as standard, helping to save you money on your heating bills

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Excellent thermal efficiency

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Futureproof your home for future generations

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Local expertise, national coverage

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Sash windows are often crucial to a home's historic character

Highquality sash window renovations  

At Ventrolla, our goal is to help you restore your original sash windows instead of replacing them. We understand the importance of preserving the unique and heritage charm of traditional timber windows. If your timber windows are draughty, rattling, or inefficient, we offer a range of restoration services, including our Ventrolla Perimeter Sealing System and a range of glazing upgrades including A-rated double glazing, which can help to bring your windows back to life. You can sit back and relax, as we will take care of the entire restoration process from start to finish. 

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A new Venetian sash window, by Ventrolla

State-of-the-art sash window repairs at Ventrolla 

At Ventrolla we have completed over 100,000 window renovations for listed buildings, conservation areas, and AONBs. With extensive experience in the industry, we combine exceptional craftsmanship with innovative technology. We work closely with local conservation and planning officers to provide superior timber window repairs that eliminate draughts, reduce carbon emissions, comply with building regulations, enhance kerb appeal, and increase property value. If you need more information about our repair services, please feel free to get in touch with our sash window experts today. 

Our Process



The Ventrolla journey begins with a discussion with a member of our team and/or a detailed home or site design survey, to explore your ideas & devise a bespoke plan of action.



Once our team have finalised the plans, we will provide a comprehensive estimate for your works. Enquiry to estimate typically takes between 5 and 10 working days.



Ventrolla fuse traditional skills with modern technology. If you require new joinery, creating your unique product begins in our UK-based manufacturing facility, and takes between 6 and 10 weeks.



The utmost care is taken to deliver quality products and renovation works that exceed our customers’ expectations. Varying from area to area, Ventrolla lead times depend on how busy we are, and the work required. On average, our installation team will be on site between 6 to 18 weeks from the date your order is placed. We will advise guide installation dates when you place your order.



Our customers come back time and time again – when they move or if they’ve phased their works – all thanks to our exceptional customer service and after care. In the unlikely event that your Ventrolla products require expert attention, we’re always on hand.



Renowned for delivering outstanding quality, all our work comes with a minimum 5-year guarantee (subject to terms), for absolute peace of mind.

What our customers are saying

Ventrolla were able to beat all the other quotations that I received and answered queries quickly and informatively, making changes as required promptly and without fuss. I was kept informed throughout of lead times and manufacturing times. The real stars of the show were Rob and James who worked tirlessly and brilliantly as a team to repair sash boxes where required and install our new sashes. Thank you!


Everybody I dealt with has been super friendly, informative, and helpful. I received emails with updates on what was happening, etc. It has been a great experience from start to finish.


I used Ventrolla to renovate my sash windows over to years ago. When two of them finally collapsed, including a bay window the size of three full sized Georgian windows they were my first contact. The office staff, surveyors and the three fitters that did an amazing job installing them in less than two days were all excellent. The quality of workmanship and the standard of installation were first class, and the new windows look amazing. I will definitely be using them again as more of my windows will need replacing over the next few years.


This is the second property Ventrolla have restored my windows for me, and the this job was every bit as good as the first. 14 sash windows in a Grade II listed building installed/refurbed without a hitch in week. The team of 4 installers were lovely chaps, super efficient and tidy. All round another fabulous job done – thank you the Ventrolla Team


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Frequently Asked Questions

What is sash window restoration and why is it important?

Sash window restoration involves repairing and refurbishing existing sash windows rather than replacing them entirely. It helps to maintain the historical integrity of a building, preserves craftsmanship, and can be more cost-effective and environmentally friendly compared to replacement options.  

What is the average cost of renovating a window?

It all depends on how much work each window needs. For a more accurate estimate, please call us on 0800 0277 454 to arrange a free, no-obligation survey. 

How long will my sash window refurbishment take?

The time taken will vary depending on the result e.g., your survey and the work we identify is needed. Typically, we work to a one-window-per-day time scale, although this can be adjusted, if necessary, to suit your requirements or our schedule. 

Varying from installation to installation, our average timescale targets are 

  • Enquiry to quote: 5-10 days 
  • Quote to order: 30 days 
  • Order to installation: 10-16 weeks 

How does the Ventrolla Perimeter Sealing system (VPSS) improve comfort levels?

The main complaints we receive from customers tend to be about draughts, rattles, leaks, and heat loss from their windows. Our draught proofing system closes the gap around the sashes, eliminating these issues whilst allowing the sashes to still travel smoothly past each other. 

Got questions that haven't been covered? Visit our FAQs or speak to our friendly team today:

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