Sash Windows by Ventrolla | The Timber Window Repair Company

Victorian House with period timber window
Repairing & replacing wooden sash windows for
35 years
Finance Options Available for Wooden Sash Window Repair and Replacement
Spread the cost
with our flexible finance options
Where classic windows
meet a modern future
Timer Window Repair by Ventrolla HERO 4
21st century
Original style, modern performance

Sash window repair, double glazing, draught-proofing and bespoke replacement Wooden windows

Sash windows embody the charm and heritage of period properties but if not maintained properly your wooden windows can be the cause of draughts, rattles, leaks and heat loss. We can help! With over 35 years’ experience fixing these problems, Ventrolla are the UK’s premier Sash Window Repair Company. 


Whether you need one window repairing or a thousand… we can help.

To help us move on with your enquiry quickly & thoroughly please answer the following questions:

Why Choose Us?

Our customers love us and our installers take real pride in their work.

What Can We Do For You

We can banish rotten, rattling and stuck shut windows with our sash window repair service, lower your energy bills with our efficient double glazing, help keep your home warm with discreet draught-proofing and craft new bespoke wooden windows to match your home’s existing style.

Our head office is based in the historic spa town Harrogate but we operate across the country from London to Exeter, Southampton to Aberdeen and everywhere in between.

Wooden Window REPAIR

By fusing classic craftsmanship with modern technology, Ventrolla are at the forefront of the sash window industry. We are uniquely positioned to offer market-leading window care across the UK; from sash window repair and renovation, to draught-proofing and removal.

Our joiners and carpenters are handpicked and trained to exceptional levels, helping our customers improve the look and performance of their wooden windows through quality workmanship and incredible service. We pride ourselves on being the custodians of history and champions of the future.

double Glazed Sash Windows

Preserve the charm of your original timber windows while dramatically improving energy efficiency.
You may think that energy efficient double glazing is a modern convenience you have to do without if you want to maintain the authentic charm of your timber windows.

That’s not the case with Ventrolla! We have developed a slim double glazing unit that performs just like a those found in uPVC windows, but retains the original profile and style of your period windows.


draught Proofing Original Windows

Period wooden windows have a 3mm air gap around the sashes to allow the sashes to slide past each other and operate smoothly.

It is this air gap that causes the inherent problems associated with period windows, such as draughts, rattles, dust ingress and reduced energy efficiency. By installing the Ventrolla Perimeter Sealing System (VPSS) we can draught proof your windows and eliminate these problems.

bespoke New Wooden Windows

Where restoration is not possible we can craft bespoke new wooden windows that match the existing style of your windows. The new timber windows are manufactured from either Accoya or treated softwoood and/or hardwood. Accoya has a 50 year manufacturer’s warranty against rot and termite infestation. If you require further information, this can be found at

The replacement sashes are manufactured using a range of selected traditional ‘through’ glazing bars, and are manufactured and hand finished by our skilled craftsmen in the UK.

Rotten Window SILL Repair

Unsightly rotten window sills not only negatively affect the kerb appeal of your home but offers the wind and rain easy access to the rest of your timber windows causing further deterioration.

The window sill gets the brunt of the weather and this can, dependent on the elevation, decoration regime and whether the window is operational, result in the sill absorbing rainwater, thus leading to rot setting in.

casement Window Repair

Casement windows have the same inherent 3mm gap that sliding windows require to operate smoothly and can therefore suffer similar draught problems, unless they have a high-grade sealing system installed.

Ventrolla’s two part process begins with the treatment and renovation of the casement window. The second part involves performance upgrading it by draught proofing the window using our unique Ventrolla Perimeter Sealing System. Using the same materials we use on sliding windows ensures the same high quality performance.

Benefits of a Ventrolla Wooden Window RESTORATION

  • Eliminate Draughts And Rattles
  • More Energy Efficient Windows
  • Add Value To Your Property
  • Reduce Outside Noise
  • Ensure Smoother Operation


With over 35 years’ experience, Ventrolla not only know all about the sash & timber window industry, we are leaders & pioneers in all aspects of window care. We constantly look for new ways to improve on traditional methods, training up our staff to consistently high levels with 6-month courses, as well as providing 5 year guarantees on all their work.

At the heart of our national company is a network of local teams that ensure every window we work on and every home we visit is left in pristine & perfect condition...

Find out more about how we repair, restore & renovate HERE