11 year old new build falling apart.

[BarryTheKestrel]

Canvassing opinion on behalf of DGP here.

My DGP sold their beautiful rural cottage and moved to a new build 11 years ago after my grandad had multiple health issues, cancer, almost lost a leg etc and couldn't cope with the ongoing upkeep of an old large property any more.

The new build had a 10 year guarantee with it. 10 years and 11 months later a large section of the roof fell off onto the footpath outside, thank God no one was walking along/parked outside at the time. The garage is also showing signs of roofing issues.
They got a workman out to repair the damage and have been left with a £400 bill.
The have contacted the building company they bought the house from who gave said too bad, you're out of guarantee.
Fair enough, however would you expect a house to start falling apart structurally less than 11 years after it was built?

According to the workman who fixed their roof, he's had a lot of business from the estate recently with similar issues, l built at the same time and all now just outside of the guarantee period.

Are they being unreasonable to want to fight this with the company?
How would you suggest doing this? Baring in mind they don't have the money for any legal representation.

[reallyanotherone]

Is there a governing body for building regulations? Ofcom style?

Without going through lawyers you could try the councils building regs department and see if they can point you in the right direction.

Other thing is if there are others, maybe leaflet the other residents and club together for a solicitors appointment to see if you have a case- if one does, you all will, and there's power in numbers...