Advice needed for dodgy wall that looks dangerous/potential disaster waiting to happen

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My first post here and hoping I've scanned enough of the intro stuff to not make any mistakes here - if not, my apologies, I tried!

So while working in a family friend's garden at their new home (a small extra patio down in a secret corner of the garden - I do groundworks and related small in-garden builds) I noticed what looked like a potential problem that's outside my scope of experience or knowledge. Google seemed to think diynot would be a place to ask, so here I am.

Here's the current site, excuse the half-arsed diagram:

existing.png

So my little job involved walking past this dozens of times, but every time I did I noticed more and more, through the shrubs, plants and weeds, that the 9" with brick-and-half pillars wall up above was sat on an exposed and pretty rough footing that varied in depth between a foot and over 2 feet, but then beneath that was just as much or more bare earth (the typical clay soil found around here). There's also 3 large cracks in the full height of the footing in various places. The wall is just shy of 10m long.

It looks like the pond area was likely excavated some time after the wall was built with no regard made for potential undermining of the whole wall and,tbh, feels really dodgy like it has the potential to go and go quickly/catastrophically!

Upon mentioning this to my mate, he asked what I'd do if it were mine. I said probably build a 9" block wall up to past the first few courses of bricks and backfill with concrete, either that or something with gabion cages:

crappy-solution.png

Afterwards though, thinking about it more, I'm not all that convinced it'd be good enough and somewhat botchy. I'm no surveyor and my brickwork training only extends to 3 years of night school to get the basics, lol, so very little real-world experience. So stuff like this isn't something I'm really all that confident about giving out advice on when the consequences could be pretty severe.

My current thinking is to tell him to ignore what I said previously and, despite the costs involved, get in a surveyor to assess the situation properly and I'm hoping anyone knowledgeable here might give the nod to that so I can feel confident it's the right move.

EDIT: Also, around half way along the way, there's a kink in the wall, outwards (towards the pond) and 2 pillars built side-by-side and gobbed up with mortar that's all cracked/fallen away, so it's effectively 2 walls, neither of which have a return or anything at least anchoring them a little. I reckon if I pushed on the smaller section I could send about 2 ton of stuff for a swim...
 
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If the existing is anything like as drawn it's in danger of imminent collapse but without dims and what the support foundations shape are and actual soil properties then it's impossible to make any logical structural assessment.
 
Your plan looks like the right sort of idea. Sounds like a nightmare of a job!

The main issue is that you're going to have to dig down even further while being right under the dodgy wall. I wouldn't do it.
 
I personally would take the wall down - how high now ? Has it any use, or just a garden decoration ? . I'm not an expert but retired from building work ( maintenance) > It just doesn't look good at all.
 
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Thanks for the replies.

I had a photo of the one end where the footing was smallest and the soil exposed beneath at its greatest (clipped from a photo I took when weighing up the little patio and figuring out how to deal with the mess the fence company left around that terrible flag-on-edge):

nothing-underneath.png


Then near the other end of the wall I had a photo I could clip to show how it's not quite as bad as the footing is deeper and goes deeper still to the right from memory, the soil exposed is less, and I can also show the levels to scale better than my admittedly slightly more drastic diagram done from memory ;) You can see how the soil has naturally started to fall away beneath the footing on this one.

nothing-underneath-2.png


So I'd forgotten that the bulk of the wall, seen from the house side, has fence section inserts - so a lot less load bearing down, but still... The blue line shows roughly the level of the driveway by the house the other side. The pink line is the bottom of the footing, everything below is exposed soil.

Hope that helps inform any advice better - all is welcome!

Your plan looks like the right sort of idea. Sounds like a nightmare of a job!

The main issue is that you're going to have to dig down even further while being right under the dodgy wall. I wouldn't do it.

Right! Digging away beneath that feels like asking to get squashed, but maybe my diagrams over-stated the problem and those waking moments in the night I had thinking about it made the problem seem worse than it might be.
 
If the driveway is as proportionally higher than the footings as it appears from your drawing then I would still be worried about the long term propects of that wall remaing stable
 
unless that foundation is reinforced and goes back a way under the drive I would put Danger Tape Do not Enter along the stream side, I assume when you say drive its not for vehicular access

A bit of light reading for you
 

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