The coping around the pool and spa is of concern, there are lots of loose stone and missing mortar. This is a safety hazard and if the stones become dislodged it will cause a fall and injury therefore all the coping stones will need to be removed and reapplied at least 75% of them most likely this would likely cost between $2000 to $4000 if including the raised wall as well. My opinion they likely didn’t seat a thick enough mortar bed or they chose too thin of stone. Either way attention is required to prevent injury as again many of the stones are already loose and mortar is already missing. On the spa spillover this is also showing signs of issue and gaps present. Recommend attention to this area as well. It might be an additional $500 for the spa spillover feature and then potential additional cost will include the waterfall itself to be re-waterproofed in the basins to prevent water loss (seen picture 2) if being used which it is likely being used with some frequency especially with the spa. Doing the waterfall remodeling re-waterproofing may run $1000 to $2000. The waterline tile appears to be in pretty good shape overall there’s no missing tiles. There’s no major gaps seen the only gaps I’m seeing slightly are inside the skimmer throat or the skimmer throat meets the skimmer. This would likely need some attention soon less than $500-$1000 for that. This could all be done at the same time by the same person and likely receive a bundled cost or this would be done at time of re-plaster which would allow you to select potentially new waterline tile for the best value if desiring that.
Estimated cost grouping: Coping reapplication $2000-4000 plus spa spillover $500 plus waterfall re-waterproofing $1000-2000 plus skimmer throat $500-1000.
Additionally, note, that on the outside of the spot over, I do see calcium pooling present, which is a strong indicator that water loss likely occurs, especially during use, with the Spa spill over having obvious issue is likely that this is one of the locations of seepage.
Note the north west of the pool decking is lifting slightly = settling.
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