azrael

Therrin
Additional comments relating to optimising the longer-term retention potential and conditions in these trees.....based on the pics provided

There appears to be root-area encroachment on the side where the Hot-tub is located (well it looks like it's a Hot-tub). That tub is set on a pad of impervious concrete(?) which will have required some excavation (and some likely-hood of root-area damages both physical and chemical....from the lime).

This cant be fixed per se but .... I would be recommending the installation of bark-chip mulch in the remaining under-canopy area (to a distance equivalent to the length to the longest branch) ...7-8cm depth and preferably of site generated material.

Also advice to the owner abt. the detrimental effect excavation can have on trees ... even for seemingly insignificant hard-landscape installation...it may prempt future root-area damages to the tree(s).
In other words, & IMO, any more insults/encroachment would be unacceptable....and I hope that tub is not ever drained out near the trees.