Nationwide Coverage

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Made in the UK

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40 Year Heritage

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Unique Patented Products

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Extensive Warranties

Industry-leading wooden window repairs

Preserving the unique heritage and charm of period timber windows really is a priority to us, and with the right care and attention, original timber window frames can provide a lifetime of enjoyment. So, where possible, we will always suggest renovation over replacement via our tried and tested Ventrolla Perimeter Sealing System (VPSSS), while expertly repairing and replacing rotten sections with ease and finesse.

So, if your original timber windows are draughty, rattling, or inefficient, we're sure our industry-leading window renovation services can help bring your timber windows back to life. After all, there’s no denying that timeless timber window frames play a crucial role in defining the character of period building facades and their interiors –
so why should you or your client’s property be any different?

Window Repair Features

What makes our timber window renovations unique?

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Patented products

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Award winning designs

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100,000+ window renovations

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In-house manufacturing

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Local expertise,
national coverage

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sash bay window

Elegant, high performance timber window repairs

Trusted heritage, nationwide coverage

From one timber window to 100 windows, our unique patented timber repair system is what sets us apart from the rest. Dedicated to making your life more comfortable, our renovation services are guaranteed to deliver the highest levels of insulation, performance, and style no matter the project size or location. Taking care of the entire renovation process from start to finish, our superior timber window repairs and renovations are guaranteed to:

  • Eliminate draughts & rattling frames
  • Reduce carbon emissions & energy bills
  • Comply with the latest Building Regulations
  • Preserve historic buildings for generations to come
  • Enhance kerb appeal & property value
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timber window renovations

Bespoke wooden window repairs for Listed Buildings, Conservation Areas, and AONBs

Working closely with local conservation and planning officers, English Heritage, Historic England, Historic Scotland, and Cadw, you can trust in Ventrolla to revive and restore unique architectural features whilst simultaneously heightening historical value too.

Our highly skilled craftsmen eat, sleep, and breathe compliant timber window repair and restoration. From intricate wooden windowsill repairs to beautiful bay window draught-proofing and everything in between, they are experts in the local history, architecture, and geography of your local area, which are all considered in the estimate and workmanship.

See our case studies
sash window repairs

Is it worth restoring old wood windows?

Investing in historic timber window restoration provides intuitive homeowners, architects, and developers with a wealth of benefits, including:

  • Usually, the most cost-effective refurbishment option
  • Notably reduces energy bills & exterior noise
  • Ensures no loss of character
  • The best choice for listed buildings, properties in conservation areas & AONBs
  • Premium shutter options complement original windows further
  • Positive impact upon surrounding architecture
  • Contributes to sustainability in its widest sense
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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.



Fusing traditional skills with modern technology, 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 manufactured products and renovation works that exceed our customers’ expectations. Depending on the project, our installation team will be on site between weeks 10 to 16.



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.

  • Specifications


Double glazed sash window units
(sashes only):

  • Slim 14mm (4/6/4) double glazed units
  • Planitherm Total+ glass (outer pane) and krypton filled cavity
  • Centre Pane U-Value of 1.5 Wm²K
  • Total Window U-Value of 1.8 Wm²K

Full Ventrolla product listings are available on the RIBA Product Selector and NBC Plus websites.

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draught proofing

What our customers are saying

Thank you very much for an excellent job, by some of the nicest, most professional builders I have had working here for three decades.

Mrs Schecter, Kensington

Excellent service from the fitters. Extremely impressed with their tools and equipment to carry out the works. Certainly knew what they were doing. A welcome change

Mr & Mrs Kukk, Whitby

We were most impressed with the speed of your reply, the sympathy you had with the building’s integrity, the quality of your demo kit and the attention to detail in your quote. You are an excellent advocate for your company.

Mary Sherwood

Hi Jarrod I refer to our recent telephone conversation and as agreed, attach hereto formal confirmation of my satisfaction with the works undertaken by your company. Ian and Lee are a credit to your business and from my discussions with them, I can tell that they really enjoy being part of the Ventrolla team.


Frequently Asked Questions

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.

Do you offer an installation guarantee?

Yes, our work is guaranteed for 5 years.

How long will my window renovation 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 estimate: 5-10 days
  • Estimate to order: 30 days
  • Order to installation: 10-16 weeks

Can you fix window condensation?

The main way to combat condensation is to further ventilate your home (i.e. open your windows from time to time). The moisture in your home is caused by heating, bodies, etc. and it settles on the nearest cold surface, which is usually your windows. Double glazing units will be slightly less cold and therefore you may notice slightly less condensation, however, your home will also be better insulated, thus more moisture may be contained within your home.

What is the average cost of renovating a window?

It all depends 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.

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

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