Warranty without Council Completion/Sign Off?

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Hi,

 

Apologies for the stupid question, but it's harder to Google a straight answer than you'd expect. 

 

Would you get retrospective structural warranty without a formal completion certificate, or would you also need "regularisation" done from the local authority?

 

Trying to resolve a difficult situation, courtesy of a **** builder. 

 

Thanks. 

[nod]

If it’s a full build you will need a Building control sign off 

Something smaller might be able to be done with an inspection