Project Description

At Cotswood, we specialise in making and fitting bespoke doors. We are really proud of our design specification and of our attention to fine detail in the handcrafted joinery we deliver.

Casement windows

Casement windows became most popular in the Edwardian period, and run right up to present house design. Casement windows are often divided into sections with vertical mullions or horizontal transoms. They are also often made into faceted bay windows. Within the window are smaller frames – or sashes – which hold the glass. These sashes can either be fixed permanently into the frame or alternatively they can be hung on hinges to enable them to open. The hinges can be at the top of the window with a fanlight, or on the side for the lower sashes. The sashing can incorporate wooden glazing bars, diving the glass into smaller panes.

Occasionally, where a casement window is attached above or to the side of an original door frame, we can replace just the part of the frame which holds the glass (the sash), leaving the original wooden frame that is fixed to the house. This enables installation of double glazed glass.  It is however better to replace the sash and the frame at the same time, as you will then be able to have full draught-proofing, locks (if opening) and also thicker double-glazed units, maximising the warmth the window provides.


Box sash windows

Early glass technology meant it was only possible to make small panes of glass, so a typical Georgian box sash window would be divided with wooden glazing bars to accommodate these small panes. As glass technology advanced, it became easier and less expensive to make larger panes. A typical Victorian box sash is made with two large vertical panes in the top of the window, suspended over two panes in the lower window.

Box sash windows are designed with the sash sliding within the wooden frame. The frame is in fact a box which contains weights suspended on ropes, run over a pulley and fixed to the wooden sash.  As you slide the window open, the weights in the frame counterbalance the sash, so it stays in the position that it is opened to. Whilst there are other methods of counterbalancing the sash (such as springs), we still use weights as we have found they are the most reliable – they just keep working!

In the design of a new box sash window, we incorporate seals to all four sides of the sash and between the sashes themselves for excellent insulation. Our design includes extra-thick wooden sashes to provide strength and to allow for decent double-glazed units, and high-quality locks.

We only install new box sashes with new frames too. Whilst it is technically feasible to install a new sashing into an old frame, we have found that our customers don’t want to make the compromises this requires with insulation, double-glazing and security. It is also often the case that the original box frames are made of redwood (softwood) and, being more exposed than a door frame, are coming to the end of their life. We find that our customers are delighted with the higher quality result achieved by installing a new frame along with their new box sash window.

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