Hi, After a bit of advice before we get the builder back. We had an extension finished around 6 months ago and builder also fitted the floor (mistake I know - in hindsight I should have got a floor fitter in, but they assured us they could do the job). The floor is floating rigid core vinyl plank floor from howdens. After install I raised that their was a lot of deflection / bounce on the floor and was told this would settle, also the short edges click like they are coming apart then reattaching. We are now starting to see 'ridges' on the short edges of a few planks, like the vinyl has come away from the backing (picture attached) as well as the odd raised corner. Appreciate that it's hard to say without seeing the flooring up close but I'm assuming these issues are due to the subfloor not being level, it was laid on concrete slab which was apparently screeded as opposed to the flooring being of poor quality, which is what I think the builder will initially try and say. The same flooring has been laid in our hallway which was plylined from a previous floor and there is no movement on that. Either way was still have some money retained from the build and our initial thoughts are to come to a comprimise with the builder, retain some of the money, live with the floor until it fails and replace in a couple of years (if it lasts that long), but wanted to get some opinions on what could be causing these issues aside from poor install.