Cracks in ceilings after adding a pitched roof

[Feefee9]

In Sep 2024 we added a hip style pitch roof to an already existing flat dormer in our attic bedroom. I done this for purely aesthetic reasons from the outside of the house. I'm now nothicing some hair line cracks in the bedroom and living room below (ground floor level) and a few cracks above door frames etc. The cracks are long, hair line and look to be where plasterboard meets plaster board underneath. I'm just worried the additional weight is causing too much strain. For reference the cracks are appearing exactly where the dormer ends at each side, so below that where I guess the weight would be displaced if that makes sense. I did notice some nail pops and cracking in the attic bedroom directly below the dormer but these happend at the time of the work and likely due to guys standing on the roof etc. Our plaster is also 5 years old and no issues until we added the new dormer roof.

I know most people aren't structural engineers but my head tends to go to worst case scenario and I'm picturing the house falling down. 🤣

Does anyone have a partner etc in the know who would reassure me that some settlement cracks are normal after altering the structure of the roof (only the dormer from flat to pitched) remainder of the roof stayed the same.

Hairline cracks are nothing to worry about. They say don't worry about a crack unless you can fit a pound coin in it

Thanks. Just wanted to add to this post that where there is alot of cracking in the top corner of the bedroom ceiling (were in a bungalow) there was also an old cast iron gate with a alot of cement concrete removed and a big fence pist screwed into the wall. I'm not wondering if taking that concrete out has made the ground slip a bit or the vibrations from the drilling have caused cracking though that doesn't explain the big crack at other side of ceiling.

Could be shrinkage, could be vibration during construction, could be more deflection in the timbers. Highly unlikely to be overloaded given the nature of the work but fill and monitor to see if the reappear and furher continue to show themselves, or get bigger, call a structural engineer for a professional opinion.