I did not have a good experience with Sash Windows London. They recently replaced my front and back doors. The front door installation resulted in three large screws coming right through the wall and poking out in the neighbours' hallway - I've added a photo of one of these. There was also damage to their doorframe. The back door was manufactured the wrong way round. The installers didn't notice until they had taken the old door out, so they had to put the wrong one in temporarily, seal the edges with expanding foam and board up the hole that had been cut for the cat flap. We had an unusable back door until they came back to fit the new one. There were numerous other problems. The day of the first installation the workmen simply did not turn up, with no notice whatsoever. When I contacted the company I was told, firstly that they would be later that day, and subsequently that they weren't coming at all and would have to rearrange. The time they came back to fix the issues the installers were three hours late, again with no notice. During the front door installation my doormat, front garden and bins were covered with sprays of expanding foam. They failed to put the flat number on the new front door (partly my fault as it wasn't in the contract). Their customer service was impersonal and perfunctory, with automated emails. I didn't feel like anyone at the company cared whatsoever about the job. They were prompt in resolving issues and came back 3 weeks later with a new back door and satisfactorily repaired the neighbours' hallway. After long and insistent emails from me they also took £300 off the final bill, along with the cost of a new doormat. I did not feel that this was adequate compensation and I really wish I'd gone with someone else. Thankfully we had our windows done by different company who were absolutely fantastic - a totally opposite experience.