Does this need to be rebuilt?

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I decided to finally deal with some blown plaster around a kitchen window, and ended up removing all of the plaster below one of the windows, which came away easily.
Underneath, the brick seemed slightly damp, which is strange given all the hot weather we've had recently.
At either ends the wood below the sill is spongy and rotten, and the inside of the skirting is the same. The mortar between bricks was also very crumbly/dusty, and I've removed most of the looser sections.

Around 8 years ago my neighbours downstairs had an extension built, which includes a flat roof and parapet wall below my kitchen bay windows.
It seems to be running off correctly, but there may be a problem related to this. The builders identified a crack around my windows at the time, which they repaired, by the looks of it with concrete.

The double glazed windows are probably 25-30 years old, so I inspected them properly, and found a whole load of worrying problems, although no signs of blocked drainage or a failed inner seal.
On the outside I did find failed caulk, cracks in mortar, blown brick faces, what looks like it could be salt deposits, and worst of all, severely bowing walls.
Above these windows is a sloping roof. at some point in the building's history this and the upper main roof were replaced with concrete tiles.
There is also a slight bow on the outside wall along the side of the building, which a surveyor has looked at and said is not ideal but also not in need of a rebuild. I had leaks from under the top floor parapet wall, but that's a separate issue, and the completely redone flat roof up there seems to be ok.

To me this looks pretty bad, and possibly not fixable with re-rendering, but am I over-reacting?

A lot of photos I know, but I tried to document all the problems in a way that's clear to see.

The house is semi-detached, and there is a passageway along one side, which may contribute to subsidence. Also, heavy lorries hitting speed bumps cause massive vibration and shaking which could be damaging the foundations.
 

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More photos..
 

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cracked render & failed caulk
 

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The felt seal has a gap, some holes in the brick face, parapet and a shot showing that neighbours also had repointing done. They don't seem to have bowing walls
 

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And the interior after removing blown plaster. The beam is rotten at both ends as well as the inside of the skirting
 

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I think I can see the square cracking in the rot that signifies dry rot (pic 4,5 post #5). I would lay a guess that when the original sash windows were replaced with uPVC the arrangement of the upvc windows over the original stone cills wasn't that great allowing water to run into the brickwork via the lower window corners. causing the timbers to rot.

It looks like you have stepped stone cills. The original sash cill would have projected over these with a drip bead underneath. It appears that the face of the uPVC window is behind the step in the cill (pic 5 post #4) perhaps allowing water to run backwards over the stone cill in to the wall.

FWIW I don't think the flat roof is the issue. With regard to bowing, you variously have heavier concrete roof tiles, uPVC windows that are not as structural as timber (not that sash windows should be structural) and rotting timbers that may all influence - whether this is serious enough to warrant major repair I would rely on your surveyor. Either way - some fairly intrusive rectification work appears to be needed.
 
Wow, that's a few issues.

I'd agree on the dry rot.

I'm wondering if a contributing factor to the state of the brickwork is poor detailing at the roofline, when it rains does water overshoot the tiles and run down the face of the brickwork? any cracks in the mortar will allow the water seep in and bugger up the bricks over time. (Had this at my old house).
 
I'd have to check how the water runoff looks when it rains, but it wouldn't surprise me, especially on the 3rd (right) window. That entire side of the bay looks really terrible overall.

Any tips on finding a surveyor who doesn't simply describe what he's looking at, and actually would know what the course of action should be?
I know about RICS, but not sure that's any guarantee..
 
To me this looks pretty bad,


All those piers look suspiciously slender and the fact that they are poorly bonded, old masonry coupled with unsympathetically replaced modern windows. The previous windows may have added to the structural integrity. I doubt the new ones do. Horrendous design, especially the jaunty angle causing roof run-off issues.

Remedy may be internal floor-to-roof repair steels and galv' straps fixed to the roof and floor. A building surveyor can advise.
 
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