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Where replacement sashes are not an option, we can manufacture and install complete new windows, including the box frame. As with Ventrolla replacement double glazed sashes,  slim glazing units are used, which enables Ventrolla to manufacture sashes using traditional carpentry methods, including ‘through’ or ‘solid’ glazing bars, which help to retain the window’s authentic feel and look.

Another main feature of the slim glazing unit is the reduced sightline of the spacer bar between the two panes of glass, which enables Ventrolla to manufacture narrower glazing bars thereby allowing to closely replicate the existing or original sashes.

Ventrolla can manufacture complete new timber windows with either:

  • Single glazed units – for use where historic protection applies, or
  • Double glazed units – that comply with the current Building Regulations, Part L


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


The new 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.


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


All new sashes include the unique VPSS draught system that has been tested to BS 6375-1 2009 Class 3, which is equivalent to 71mph winds.
The system is fitted by routing grooves into the mid-rail and bottom rail in the sashes, and within the inner face of casement windows, to which a pile carrier is fitted and appropriate height weatherfin pile installed.
New parting beads and staff beads are fitted that also incorporate the weatherfin pile, creating a fully sealed window.

Do you love the original charm and heritage innate in your wooden sash windows but hate the draughts, rattles, rot and heat loss that can also be part and parcel with an older property?

Maintaining the traditional features of your timber sash windows used to mean compromising on comfort. But not with Ventrolla. Their unique sash window renovation and performance upgrade service makes problems associated with old sash windows, such as draughts, rattles, rot and operational issues, a thing of the past, allowing you to enjoy your traditional wooden sash windows, regardless of the weather outside, and reduce your energy costs at the same time.

Through their national network of craftsmen Ventrolla have established themselves as the market leader in timber sash window and casement renovation & repair, offering a guaranteed and unique service.

For a FREE no-obligation survey and quotation call 0800 378 278 or visit the website.

Proud to exhibit at the Homebuilding & Renovating Shows. Traditional timber sash windows are an essential feature of a period building’s character. It is, therefore, vital to retain them; not only because of the aesthetic appeal, but also because sash windows make your property much more valuable financially.