The proof about why wooden sash windows will last longer than modern plastic sash windows is in the older homes. There are houses that are one hundred and fifty years old and older than still have the original wooden sash windows.
The craft of sash window replacement is often found in the type of carpentry known as joinery. Joiners are often builders of tables and cabinets as well as any type of intricate joining of wood such as a sash might entail. Another type of carpenter that may be knowledgeable about sash building is an architectural timbering carpenter.
In the opinion of many, sash windows are an intrinsic feature of ‘period’ homes and should be saved at all costs. Well, maybe not ALL costs, but definitely worth the time and trouble to repair rather than replace. Some repairs are easy enough to do yourself so here’s a little about how sash windows work.