J Castle – Westminster, W2 (November 2016)

“Core Sash Windows put two double sash windows into my flat and the difference is amazing. The look is excellent and all the draughts and noise gone. The workmanship by the two fitters was excellent as was their cleaning and clearing up each night. I am very pleased with the end result recommended to a neighbour and looks as if they will have another job in the street. Well done and thank you”