Rental Income Wear and Tear

A client rents out a property for which we have adopted the wear and tear allowance in the past. However, this year she has rented out a further room, one which she has kept for herself in the past and has had to fireproof some doors and install a fire alarm system to comply with HMO requirements. HMRC guidance states "However, in addition to the 10% allowance, a taxpayer can also deduct the net cost of renewing or repairing fixtures that are an integral part of the buildings. The net cost means the cost of the replacement less any amount received for the old item."  Am I right in thinking that this work does not fall into the above and will not be allowable, even though it is a requirement in order to let the property.

Opinions would much appreciated.

Stanley