Praise be to Allah.
We have no need to explain the ruling on their riba-based loans, as it is perfectly clear. Those who take out such loans have committed a major sin, and you should advise them and remind them that what they are doing is haraam and that they need to repent from it.
With regard to your question:
The work of a construction engineer may be haraam or it may be halaal:
If he designs the house for them or draws up plans for them so that they can obtain a riba-based loan, this action is haraam and he is helping them in sin and transgression, because his action in this case is connected to the riba-based loan. Allah, may He be exalted, says (interpretation of the meaning):
{And cooperate in righteousness and piety, but do not cooperate in sin and transgression} [al-Maa’idah 5:2].
But if the designing and drawing of plans came after they obtained the riba-based loan, then there is nothing wrong with the engineer designing the house, drawing the plans and supervising the construction, even if the funds of the owners were obtained through an unlawful riba-based loan, because the riba-based loan has to do with those people who dealt in riba, not the money itself, and the engineer is only accepting that money in return for his effort and his work. The same applies to the one who sold them the land or building materials; there is no blame on them for doing that, because they all received the money in return for what they sold of land and materials, and they have nothing to do with the riba-based loan.
See also the answer to question no. 82277 .
And Allah knows best.
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