What is this thing called on my roof under my window?

[Howdoisawwithnosaw]

It’s probably not called ‘extra big roof tile’ which is my name for it in my head.

Its slipped and I need to investigate if it’s covered on our new house warranty or insurance or I just need to pay for someone to come fix it but I can’t do anything like that without knowing what it’s even called.

Also if anyone knows roughly how much it would cost to fix something like this so I can brace myself before getting quotes that would be amazing.

Flashing

It looks like it just needs pulling/pushing back in under the window frame.

It's called lead flashing and should be an easy fix.

If you can reach it you may be able to put it back into m place for now?
Try to sort it quickly before any rain leaks through.
I usually look on Facebook and send pictures to local tradesmen to get rough quotes. Although not always successful at the moment getting people to pop round to quote and the prices and so diff from each one sometimes. Also had them turn up randomly, Turing up then not quoting ... So prepare yourself for all that too. Hopefully you will be lucky.

It’s lead flashing. Commonly torn in windy weather conditions, but if it’s just slipped down on a relativity new roof then it might be a fault in its installation - I.E. not fixed in place properly.

Costs for the actual repair will be minimal - but it’s any logistics involved in accessing it to do the repair, if it can be done by a roofer on a ladder it probably won’t be too bad, but if you start to get into scaffolding territory due to location or height of house then it could be very expensive.

I’d have a word with a roofer to see what costs are likely to be, and then make a decision about whether the NHBC process is worth the effort, or paying out for your buildings insurance excess.

Very helpful thank you everyone!