Sash Windows by Ventrolla - The Finest Bespoke Wooden Sash Windows

Ventrolla Joinery Workshop - Bespoke timber Windows
Traditional Craftsmanship
Meets Modern Machining
Bespoke Casement Window by Ventrolla Harrogate
Your Choice Of The Finest Hardwood
and Engineered Timbers
Ventrolla Joinery Window Workshop Manufactured in Britain
All Our Bespoke Windows
Are Manufactured In Britain
Bespoke new slim double glazed sash windows by Ventrolla
Every New Window Is Fitted With
Our Unique Slim Double Glazing
All Bespoke Wooden Windows Have Our Patented Draught Proofing System
Benefit From Modern Draught-Proofing Performance
While Retaining Original Charm

Sash Windows by Ventrolla - The Finest bespoke Timber Windows

Where repair or refurbishment is not an option we can manufacture new sash windows, including the box frame that will match the existing style of your timber windows. 

For maximum thermal efficiency we use slim double glazed units which enables us to manufacture windows using traditional carpentry methods, including ‘through’ or ‘solid’ glazing bars, which help to retain the window’s authentic feel and look but also benefit from modern heat performance. If your property is Listed, in a conservation area or has protected status then we can use single glazed units to maintain authenticity.

The timber we use depends on your requirements and budget and can range from softwood and hardwood through to engineered timbers like Accoya. Our team will help you weigh up the benefits of the various timbers.

Some of the hundreds of New Timber Windows we have Installed

Over the 35 years Ventrolla has been trading we have repaired or replaced many 10’s of thousands of timber windows. This is a small selection. Take a look at our Case Studies to see more. 

1 over 1 in London
1 over 1 timber sash windows
1 over 1 in Manchester
1 over 1 sliding sash windows
6 over 6 In Derby
Idyllic Country Kitchen With Wooden Sash Windows Repaired By Ventrolla
6 over 6 In Liverpool
6 over 6 windows - Port of Liverpool
1 over 1 bay window in York
Sash Window Repair in York
6 over 6 in Horley
Ventrolla South East - Sash Window Repair 2
6 over 6 in Manchester
9 over 9 in Salford
6 over 6 In Glasgow
2 over 2 in Sandhurst
2 over 2 timber windows
12 over 1 bay windows in London
12 over 1 timber sash windows
Large 1 over 1 in London
Bright Lounge with Sash Windows Repaired by Ventrolla


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

Why choose Ventrolla to craft your new windows?

Our customers love us and team in our joinery shop take real pride in their skill.

Please pass on our special thanks to Craig for his excellent workmanship. It was a pleasure to have such a skilful and efficient craftsman working on renovating our old sash windows and fitting two new ones. He always arrived on time, answered our many questions politely and patiently, and thoroughly cleaned up any mess made. A real example to others!

Please don’t be put off by the word ‘manufacture’, the honed skills of our joiners in our UK-based workshops ensure a bespoke, non-mass-market, product. 

Each bespoke timber window is lovingly built to your home’s bespoke specifications, and your requirements, using our traditional carpentry methods. Along with being aesthetically correct for the period of your home all of our new sliding windows and casement windows come with our patented Perimeter Sealing System to banish draughts and out high performance slim double glazing. Plus we fit click in click out removal system which makes cleaning and painting your windows simple. 

Authenticity is the key to our new joinery, and these windows retain the presence you want whilst delivering the modern glazing standards you need.

We use a special engineered wood called Accoya which is incredibly stable, resists rot and warping.

We offer a full range of window hardware including finger pulls, casement stays, pulleys, safety stops, latches and pole hooks in Chrome Plate, Satin Nickel, Polished Brass and Antique Brass finishes

Our Joinery Workshop

Bespoke New Sash Windows
New Wooden Bespoke Sash Windows - Ventrolla Harrogate
Sash Window Finger Pulls 1024px - Window Hardware By Ventrolla
Choice of Glazing

Choose from Single-glazed units - for use where historic protection applies (listed buildings or conservation areas), or Double-glazed units - that comply with current Building Regulations, Part L

Glazing specification of Single Glazed Units

4mm float glass or 3mm drawn glass is installed into the new sashes and a new box frame made to match the original window (mainly applicable for listed buildings, those within conservation areas and other properties with restrictions).

Glazing specification of Double-glazed Units

Slim 16mm (4/8/4) double glazed units utilising the latest Warm Edge Spacer Bar technology, Planitherm Total+ glass (outer pane) and krypton filled cavity.
Centre Pane U-Value of 1.2 Wm²K and Total Window U-Value of 1.5 Wm²K

Timber specification

The new windows are manufactured from the very finest and durable timber, the choice of which depends on our customers specification and budget. The replacement sashes are manufactured using a range of selected traditional ‘through’ glazing bars and are manufactured and hand finished by our skilled craftsmen.

Ventrolla Sash Removal System (SRS)

To assist with future maintenance and painting we can install our patented Sash Removal System (SRS) that enables both the top and bottom sashes to be removed for redecoration.

Ventrolla Perimeter Sealing System (VPSS) Specification

All our new replacement windows include the unique VPSS draught system, as standard, which has been tested to BS 6375-1 2009 Class 3, equivalent to 71mph winds.



Your new windows are supplied sprayed with a high build base coat and an anti-stain primer, ready for final finishing coat by others.

Visit our ‘contact us’ now page and let us help make your windows exceptional