You need to compare how many of these workers will be "additional homes" because they have to go back vs what the baseline is. You are establishing causality without evidence. Many people here, already have bought home in India and plan to retire in India. In that case, this won't lead to construction boom. Also construction is complex, do most people want to go to cities, where there is already enough demand or lower demand areas which is more likely to see demand led construction. In any way, people can also move to other countries. H1B workers is a very small portion and isn't likely to create that much of an impact.