Purchasing a 3 story property which doesn’t have fire doors

[Guest Sarah W]

Guidance needed please.  I’m trying to purchase a 3 story property.  My survey has flagged that there are no internal firedoors.

The loft extension was done in 1997 and I believe firedoors were required then.  I imagine they have been replaced over the years by various owner with standard normal doors.

The owner of the house is saying as they have building regs signed off in 1997 then this is not a problem but I disagree.

It is a large property with around 10 internal doors to replace.  If I order the doors myself and have a carpenter install them who do I get to certify the work meets fire regulations? 

I did get a quote from a fire specialist company to complete the work which I think was extremely high, around 16k in total.  Maybe it’s a much more expensive job than I realised.

Also, will I need to get special insurance on the property to ensure we are covered until the work has taken place? 

Thank you in advance and apologies for me essay.