Sash Windows

We restore original sash windows

We can restore your period windows to a very high standard.  Using old recycled hart pitch pine with a splicing and epoxy system our repairs will last and the potential for shrinkage and movement, common in sash repairs, is largely eliminated.  Our draft proofing, using a brush strip, provides excellent sealing ability without the introduction of plastic parting beads and other typical eliminates used by many.  We can use a reproduction cylinder glass to match the original glazing, modern glass looks quite different from the original cylinder or crown glass.  Modern glass can be quite mirror like and lacks the slight imperfections of the original which gives old windows there character.

We do not make new windows.  If your project needs new sash windows we would refer you to a joiner experienced in period sash windows.

The windows are the “eyes” of the house, and a very important architectural element.  Best to get a proper joiner experienced in period sash windows, the assumption that any competent jointer can do the job is wrong, most competent but ordinary joiners don’t get asked to do conservation specification sashes and have no understanding of the details, and it’s the fenestration details that make the difference.    Windowpane size and ratio, width to height, size and shape of mullions and mintons,  tong shape and size, frame size, sills….. etc.  The appropriate period is important too,  an 1820 window is quite different from a 1920 window.  If your doing new windows double-glazing affects many parts of a sash, it not just the glass, it can’t be put in willy-nilly, glass thickness effects the thickness of the frame, the width of the mullions, you cant putty normal double glazing.  Not to mention the weight of a double glazed sash, it could execute you, but  there are alternatives.   It’s a myth that Upvc is somehow cost effective due to its low maintenance, we regularly repair windows that have been comfortably doing their job for 200 years, a paint job every 8-10 years rather than replacement every 20 years, now that’s low maintenance.



work on original sash windows

this example is a swing sash window

Here is a before, left and after below. Note timber sill, which is not only an inappropriate design for an Irish sash but is severely decayed. Note the cement plastered reveals, poorly applied putty and replacement glass.



Right is the restored version, these elements have been restored correctly.



Decayed lower frame









Excess build up of paint makes the window inoperable


Decayed frame where cement reveals meets the edge of the frame, lower frame decayed where it met the sill.




Left, cement reveal is removed for access to frame and in preparation for lime plastering. The lime plaster will allow the moisture to evaporate through the lime rather than driving it to the timber frame where it contributes to decay.








Right a sash is chemically stripped of paint build up.

It is not always necessary to remove all the paint. Subject to specification. 

Decayed putty and glazing is removed.




Decayed meeting rail is removed.






Left and below, lower section of sash stile is repaired with new mortice joint, new piece spliced in. Right and below.









Below, new meeting rail is made








A 2 part epoxy is used in joint splicing work and for small repairs and holes.



Repaired sash stile and meeting rail assembled, ready for planning.


Completed below



Left here is one with sash stile and meeting rail decayed,


Left with new sections installed.

New glazing, in this case cylinder glass being putted (linseed oil putty) into primed sash frame.







The frame is cut ready for splicing.



New splice in window frame, note splice cut is sloped up for correct weathering detail.




New timber sill








Lime plastered reveal.