We couldn’t decide for ages between new sash windows or secondary glazing. These guys were so patient with us and went through the different benefits and drawbacks several times with no pressure to make a decision. Ultimately, we opted for secondary glazing and are so pleased with the results. There is significantly less noise and much more heat, plus the units don’t mask our original sash windows or spoil the aesthetics. The service was excellent, too – five stars all round!