We live on busy cut through road that is especially noisy early mornings with commuters and evenings with fast food delivery scooters. There was existing double glazing that made absolutely no difference to the sound, it was as if the windows were open. I honestly was sceptical how much the secondary glazing would work but it has transformed our lives, or at least our sleep. The noise has gone from unbearable to a barely noticeable very dull background hum. We were conceded how intrusive they would be too but they are alot more inconspicuous than we thought. The existing window frames are pretty wonky as the house is old and has shifted around over the years so we went for the bespoke wooden secondary glazing frames which are great, you can see the grain of the wood and they're colour matched to the existing frames to make them less visible. They are expensive, along the acoustic glass, but you can see how well they're made and the noise reduction is very impressive. They fitters were all very friendly, helpful and efficient and along with Dean the first point of contact and Steve and Anne on the email, have made the whole process easy and stress free. All in all I couldn't recommend them higher.