Cracks in solids wall plaster

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Hello

I bought a house built around 1900 in January. I'm looking for bit of advice on some cracks I have as I'm useless at DIY and a bit of a worrier. Cracks we there when we bought house and were pointed out on building report, with further investigation recommend. I believe they have spread longer. I Have have labeled photos best I can. First crack Is on solid front room internal wall diagonal with secondary cracks coming off it. Plaster sounds loose around some of crack when tapped In same room there is a crack above edge of window bay, a crack on ceiling that looks as if previously repaired, another new crack coming from same part of ceiling through coving into wall and a horizontal crack going from first crack beside were wall meets ceiling.
On the orher side of First wall there is a long diagonal crack mirroring First crack also with loose sounding plaster in places.
Then in the bed rooms above First wall there is a big horizontal crack in corner of room on both sides of this was again it's a solid wall.

I have several questions, are these cracks anything to worry about being diagonal? Or is it just a case of blown plaster loosing it's grip?

If it is just blown plaster will whole wall need replastering or is there another solution?

Are the other cracks in ceiling and window and walls a concern as all in pretty much same area of house?

I understand house is 125 years old and will have cracks just these are very prominent and are worrying me.
Also if it needs further investigation whos best to look at it a builder, plasterer or a structural engineer?
All advice will be greatly appreciated.
 

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More photos
 

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They all look like common thermal cracking, not structural cracking.

A structural engineer is the one to diagnose cracking and specify suitable remedial work.
 
So it will be better to have structural engineer look at it, than repairing without knowing cause? Or will a good plasterer be able advise and repair

Cheers
 
Last edited:
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Plasterers plaster, they don't diagnose.

With cracking, it's no good doing a repair unless you know the cause and that movement won't recur.
 
Thank you for advice, like I said I have no clue about this stuff.
 
Also, i would remove some of the plaster around the cracks to see whats going on behind...
 

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