woodsmith
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I'm not sure where you are, but in the UK, even if you don't need planning as you are replacing an existing structure, you would still need building consent and this would have covered the fixing method. Building Control would have probably wanted a structural engineers report at that stage.
The strength of the fixing very much relies on the existing wall and its construction. The rendering makes it a bit more difficult as you can't see what it's made of but if they have made a good fixing into a sound wall, that isn't made of lightweight blocks or the like, then I would think you will be ok. Even if they had fixed a wall plate (ledger) then it would have still relied on a good fixing into the wall.
You could still get a structural engineer to look at it, they are likely to charge about £150.
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