Ruling on renting out the accommodation provided for him by the company
Question

                The company has provided me with furnished accommodation, and they do not charge me any money in return for that. A friend has suggested to me that he could come and live with me on the basis that he gives me part of the accommodation costs that his company for which he works gives to him (which is a different company than my company) and keep the rest for himself. If this haraam or halaal for both parties in this case, and in the event that he gives me the full costs of accommodation and never gets any of it?.
Praise be to Allah.
    What some companies give to their employees of accommodation 
    to live in falls into two categories: 

    1.The right to use it and benefit 
    from it belongs to the employee, so he has the right to live in the house or 
    to rent it out to someone else or to rent out part of it. The basic 
    principle concerning that is that the one who has the right to use something 
    is permitted to benefit from it himself or to let someone else benefit from 
    it who will use it in the same manner.

    2.Where there is permission to 
    live in it only, and he does not have the right to make use of it. In that 
    case the employee does not have the right to rent out the house or part of 
    it. This is like the accommodation that is provided by the university to its 
    students; they have the right to make live in it but they do not possess the 
    right to benefit from it, and if a student does not need the accommodation 
    he does not have the right to rent it out to someone else.

    Based on that, if neither of the two possibilities is stated 
    in the contract, then it is essential to ask the company. If they allow him 
    to rent out the accommodation or to let someone else live with him, then 
    there is nothing wrong with it; but if they do not allow that, then you do 
    not have the right to let someone else live with you. 

    The scholars of the Standing Committee for Issuing Fatwas 
    were asked: Most of the companies allow employees some benefits, one of 
    which is that the company will give the employee the choice between taking 
    accommodation to live in with his family or an equivalent amount of cash, 
    which accompanies call the accommodation allowance. The company system 
    prevents use of the accommodation except by the employee himself. It has 
    become common among employees who get accommodation to rent out the 
    accommodation to people who do not work for the company. What is the ruling 
    on this money in this case; is it halaal or haraam wealth? We hope that you 
    can explain the matter because it happens a great deal. May Allaah bless 
    you. Please note that this action is against company rules and may result in 
    a penalty. 

    They replied: 

    If the company system states that the accommodation is only 
    for the employee himself to live in and that he does not have the right to 
    rent it out to others, and he has agreed to that, then it is not permissible 
    for the one who takes accommodation from the company to rent it out to 
    someone else, because this is contrary to the conditions stipulated between 
    the employee and the company. And Allaah is the source of strength. May 
    Allaah send blessings and peace upon our Prophet Muhammad and his family and 
    Companions. End quote. 

    Fataawa al-Lajnah al-Daa’imah, 
    14/468 

    And Allaah knows best.