Costs of alterations necessary because of legislative compliance.

HMO Licensing

I have had to undertake variouis measures such as installing fire alarm systems, extinguishers etc to comply with legislation for letting a property.
I have also had to have a stud wall constructed and fit a fire door at the top of the staircase to make a fire break. This could be classed as an 'improvement' and therefore not be allowed to offset the cost. This is something I would not have had done had I just had the choice to do it or not.
So would the cost of this be deemed deductable because I am doing it to comply with legilsation rather than 'improve' the property ?

many thanks