Cost will depend on the details - remodeling can cost up to 50% of the original pool cost

Hi, if the pergola is to add shade to the pool area I would consider a versatile solution such as a motorised awning that allows to control the amount of shade throughout the day. I would also add a strip light so that the pool area can be used at night.

I worked in Australia building swimming pools, including some celeb clients. If you can, try to get hold of a copy of ‘poolside’ magazine from Australia. This is a consumer magazine and should give you lots of inspiration. Construction-wise we would normally pour a concrete ring beam around the pool deck that would anchor into the top of the pool sides with metal rebar dowels. Next the bullnose pavers would be overhung around the edge of the pool and then paved up to, before grouting. By the looks of it you’d be retrofitting this pool surround so could cause structural issues if the ground around the pool is not well compacted, and the ring beam moved, while being attached to the pool itself. With this in mind, you may want to look at something like compacted hardcore with a resin bonded gravel over the top. This will be non slip, can flex, if the ground moves, and by the time you’ve poured concrete and then paved it, would be cheaper and faster to install. Aesthetically, it may also be a good fit? Am not sure on compatibility for use around pools - perhaps seek reassurance from a U.K. provider first and then contract a reputable local provider. Decking is another option but slip resistance could be an issue on natural timber and the synthetic stuff fades and warps. Hope it goes well : )

The pool man was going to leave it like this. then he said could cover the blocks with mosaic tile. But I think the gap is too big and I don't like the blocks. so he said we can add extra marble and stick it underneath the present marble OR add 2 squares of the mosaic tile underneath the present marble , so the gap is less ,but I think I 'll still be able to see the blocks.