H R G HRG SERVICES LTD 0800 246 1947


Experts at installing slim double glazing into existing timber sash or casement windows 

Are you looking for the benefits of double glazing but don’t want to compromise on the look and slim proportions of a traditional sash window?

At HRG Services – The Exterior Specialists, we specialise in converting single paned timber windows into slim double glazed timber windows using our 12mm sash window double glazing units or we can install newly manufactured replacements with slim double glazing already installed.

Our units are ultra slim meaning that from a distance they still appear to be single glazed sash windows and therefore in keeping with your property.

Once beaded or puttied in our units will still appear to be single glazed glass thus keeping the traditional look but with all the benefits of modern double glazing.  Our units achieve a 1.9UV, couple this with draught proofing and the benefits are instantly noticeable.

In addition to our slim double glazing packages, we also offer a Heritage glazing package, the perfect solution to complimenting the older properties and keep the character of the existing glass.

Please do not hesitate to contact us for a free no obligation survey or for further information


HRG specialise in converting original windows into slim double glazed ones. We offer two ways of doing this one is to manufacture new copies of the sashes and insert them into the existing frame. The other is to install the glazing directly into the sashes themselves. We can advise what is the best option for your project when we conduct a site visit. Slim Double Glazing gives you the benefits of double glazing without having to compromise on the slim proportions of your original window.

Call HRG Services today and book your free no obligation site survey on 0800 246 1947

Glazing 1 700-min
New Sash Windows


HRG Services Ltd provides a bespoke heritage glass replacement service to suit our clients needs, throughout Dorset and the neighbouring counties of Hampshire, Somerset and Wiltshire.

On many of our projects original glass is required to replace the old broken glass, this can be very expensive and difficult to source.

Hand blown cylinder glass sheet to replicate as closely as possible the original crown glass and cylinder glass used in the Georgian and Victorian eras from 1700 to 1860.

Thickness can vary within the same sheet with an average 3mm and sheet sizes vary. Slight waviness refracts light, and imperfections make this glass suitable to recreate the authenticity of period glass.

Call HRG Services today to ask about our Heritage Glass service.


HRG Services can supply and install bespoke manufactured timber windows.

Our skilled team can supply and install complete new timber windows if required. Our new sash & casement timber windows we be bespoke for your property.

We offer any glazing, detail or paint finish you require and all windows will be fully draught proofing and install to the highest standard.

Our full frame sash and casement windows are designed to match originals so it will blend in perfectly with your property, no matter what the age or style of the house is.

Our windows can either have solid glazing bars or stuck on bars at your request.

Most of our windows come with an undercoat finish ready for installation and a final hand applied coat once installed onsite.

Installation of new timber sash windows

“HRG Services – The Exterior Specialists have built an impressive 

reputation as the go to company for upgrading glazing packages for traditional timber windows”

David Garrett
Managing Director


Areas We Cover

Where we work

HRG Services cover Dorset, Hampshire, Somerset and Wiltshire offering a dedicated bespoke service tailored to your needs.

Installation of new timber sash windows
New Sash Windows
New hardwood windows
New Casement windows