Property Query re remortgaging

Salam I have a query:

An indivdual is looking to buy a property using a btl mortgage. they will then hire someone to uplift the value of the property. wether that be a refurb or whatever. They will inrcease the value of this property using their own funds.

The owner will then look to remortgage the property where they will receive a lump sum payment as the property has increased in value.

The owner will then give some of this money to the person hired to cover his costs of uplfiting the vlaue of the property as well as some profit to make it worthwhile for him.

Is it permissable being the person hired? as you not getting involved with the purchase of the property.

JZK