Working in construction or painting of a house for a fortune-teller or practitioner of witchcraft
Question

                What is the ruling on building or painting the house of a fortune-teller or practitioner of witchcraft, whether he wants to buy it or rent it, and I will be paid by him?.
Praise be to Allah.If the practitioner of 
    witchcraft or fortune-teller is going to use this house to practise magic or 
    tell fortunes, it is not permissible to sell it or rent it to him,  and it 
    is not permissible to build it or paint it for him, because it is a place 
    that is being established for sinful purposes, so he should not be helped in 
    any way, because Allaah says (interpretation of the meaning): 
“Help you one another in 
    Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one 
    another in sin and transgression. And fear Allaah. Verily, Allaah is Severe 
    in punishment”
[al-Maa’idah 5:2]
And because there is 
    evidence which indicates that it is obligatory to denounce evil, and that 
    the one who remains silent and approves of it is to be condemned, so how 
    about the one who helps with it? 
Ibn Qudaamah (may Allaah 
    have mercy on him) said: To sum up, selling fruit juice to one who is 
    certain to use it to make alcohol is haraam. Then he said: The same ruling 
    applies in all cases where the aim is something haraam, such as selling 
    weapons to those who are at war with the Muslims, or to bandits, or at times 
    of fitnah, or selling slave women to become sinners, or renting them out for 
    such purposes, or renting out one’s property for alcohol to sold from it, or 
    to be used as a church, and so on. This is haraam, and the contract is 
    invalid. End quote from al-Mughni (4/154). 
Shaykh al-Islam Ibn 
    Taymiyah (may Allaah have mercy on him) said: It is not valid to sell to one 
    who intends to use it for haraam purposes, such as selling fruit juice to 
    one who will use it to make alcohol, if that is known, according to the view 
    of Ahmad and others, or if it is thought most likely, as is one of the two 
    views narrated from Ahmad. This is supported by the fact that our companions 
    said: If the landlord thinks that the renter will rent the building for 
    sinful purposes, such as selling alcohol and the like, it is not permissible 
    for him to rent that building to him, and the rental contract is not valid. 
    Selling and renting are the same. End quote from al-Fataawa al-Kubra 
    (5/388).  
It says in Mataalib Ooli 
    al-Nuha (3/607): 
It is not valid to rent out 
    a house to be used as a church or synagogue or hermitage, or as a “fire 
    temple” for Magian (Zoroastrian) worship, or for selling alcohol or 
    gambling, because that is helping in sin, and Allaah says (interpretation of 
    the meaning): “do not help one another in sin and transgression” 
    [al-Maa’idah 5:2]; or to rent it out for music and singing, or anything that 
    the Lawgiver has forbidden. This is the correct view. If the haraam usage is 
    mentioned in the rental contract or is known from circumstantial evidence, 
    the contract is invalid. End quote. 
It says in al-Mawsoo’ah 
    al-Fiqhiyyah (8/228): 
Because the purpose behind 
    a rental contract is selling the usage of the house for a specified length 
    of time, conditions should be observed in it as in a contract of sale, which 
    is that there should be no shar’i impediment to making use of it, such as 
    haraam things like alcohol, musical instruments and pork. It is not 
    permissible, according to the majority of fuqaha’, to rent out a house for 
    purposes that are not acceptable according to sharee’ah, such as if the 
    renter is going to use it as a place for drinking alcohol or gambling, or he 
    is going to make it into a church or place of idol-worship. In that case it 
    is haraam to accept the rent and to pay it, because it is helping in sin. 
    End quote. 
But if the practitioner of 
    witchcraft is going to use it as a place of residence and you know for 
    certain or based on circumstantial evidence that he is not going to use it 
    for practising witchcraft and falsehood, then it is permissible to build it 
    and paint it, although it is better to keep away from that, because the 
    practitioner of witchcraft should be shunned and rebuked, and the community 
    should oppose him until he repents from his haraam actions. 
Thus the difference is 
    clear between the house that is acquired for sinful purposes and the house 
    that is acquired to live in. Even if a sinner or kaafir is going to live 
    there, there is no reason why one should not build a house for a kaafir or 
    sinner. 
And Allaah knows best.