Incomplete party / fire wall in loft

I am in the process of purchasing an end terrace property and survey has noted an incomplete fire barrier / party wall issue in the loft which mortgage lender wants fixed (as do I) - there is a chimney on the party wall blocking most of the space but large gaps either side going diagonally. Question is: what is the best way to make this fire safe & also secure from neighbour entry? What is the expected cost & time involved? Not sure if I need general builder, fire proof expert etc? Advice greatly appreciated. (Based SE London / Kent).

Asked by Rebecca on 15th Sep 2025
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