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Add authentic character & charm with our new timber casement windows

Typically opening outwards from the side, in a similar fashion to the way doors open, wooden casement windows feature exceptional insulative properties whilst enhancing a wide range of property styles. Manufactured in-house using time-honoured joinery skills fused with future proof technology, with over 40 years’ worth of experience designing completely new timber casement windows that seamlessly replicate the originals, preserving your building's unique aesthetic is made easy with Ventrolla.

Casement window Features

What makes our timber casement windows unique?

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Patented perimeter sealing system

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Bespoke arrangements & designs

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Premium timbers, glazing & hardware

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Custom fit to your property with care

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Local expertise, national coverage

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Time-honoured techniques with industry-leading performance

Classic but far from outdated

From elegantly understated Georgian casement windows to ornate Victorian and Edwardian casements and everything in between, our timber casement windows are crafted for absolute convenience. Coupled with our unique blend of time-honoured joinery skills and future-proof technology, this is what sets our timber casement window products apart from the rest. Combined with efficient slimline double glazing, conservation-friendly secondary glazing, or single glazing to suit the most restricted locations, you can count on Ventrolla products to deliver the perfect balance of improved energy efficiency, security, and prized period aesthetics.

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What are the benefits of timber casement windows?

From intricate Georgian bar detailing to more modern casement window designs, with our versatile timber casement window replacements you can look forward to:

  • Side hung, top hung & bottom hung arrangements available
  • Superior thermal insulation & window security
  • Listed building, conservation area & AONB compliance
  • Easy operation & maintenance
  • FSC certified hardwoods, softwoods & Accoya® timbers
  • Single, double, & secondary glazing options
  • A choice of colours & anti-stain primer as standard
  • The flexibility to update aesthetics as required (e.g. repaint)
  • Sympathetic period designs can increase property value
  • A lifetime of enjoyment with the correct maintenance
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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.



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.

  • Window Furniture
  • Energy Effciency
  • Maintenance
  • Specifications

Window Furniture

Exquisite timber casement window ironmongery hand forged using traditional skills

Compromising on quality simply isn’t an option at Ventrolla, which is why we source our casement window furniture from the very best that the industry has to offer.

Retaining the character of your new casement windows in every aspect, our classic collection of fittings includes quality casement stays, locking pins, and fasteners. With a diverse range of finishes, from polished brass Teardrop fasteners to antique brass Curly Tail stays and chrome plate Bulb End fasteners to satin nickel Reeded fasteners, adding authentic character and charm is easy with Ventrolla.

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Energy Effciency

High performance timber casement windows

Of all the window styles, timber casement windows retain the most heat thanks to ultra-tight seals positioned around the frame. Timber is a naturally insulating construction material, offering superior thermal insulation where it’s needed most. Adept at keeping buildings warm and cosy whilst eliminating draughts and rattles for good, combined with efficient double glazing, secondary glazing, or single glazing, you can combat rising fuel bills and improve energy efficiency across the board with a high-performance Ventrolla installation.

Once we receive your final payment, our handy ‘Care Pack’ will be sent to you or your client which includes energy improvement certificates for absolute peace of mind.

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How do you clean timber windows?

Low levels of basic maintenance and cleaning are essential to prolonging the life of new timber casement windows. Requiring a fresh coat of paint every 6-8 years and a quick clean every 6 months, periodic timber window maintenance doesn’t need to be time-consuming.

Once we receive your final payment, our ‘Care Pack’ will be sent to you or your client which includes handy Maintenance Instructions to keep new timber windows looking their best for longer.

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New double glazed timber casement window specifications

  • Slim 16mm (4/8/4) double glazed units
  • Planitherm Total+ glass (outer pane) and krypton filled cavity
  • Centre Pane U-Value of 1.2 Wm²K
  • Total Window U-Value of 1.5 Wm²K

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

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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

I live in a listed building / conservation area / AONB - can you work on my property?

Quite simply, yes, we can! We have completed lots of work over the years on listed properties and those within conservation areas and Areas Of Outstanding Natural Beauty (AONB). Working closely with local conservation and planning officers, English Heritage, Historic England, Historic Scotland, and Cadw, you can trust in Ventrolla to reinstate and sustain unique architectural features whilst simultaneously heightening historical value too.

Will new windows cut down on outside noise?

Our secondary glazing system and the Ventrolla Perimeter Sealing System (draught-proofing) have been independently tested and proven to significantly reduce sound intrusion.

Do you offer an installation guarantee?

Yes, our work is guaranteed for 5 years.

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 027 7454 to arrange a free, no-obligation survey.

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

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

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