There is another issue here which is that it may be dalayed in starting, might not be any noise over weekends etc. Might run for another month. Whatever. Why not say that during the period of approximately this to this, there may be construction noise. Should this happen during your visit, your stay will be reduced by xx%. Whatever you deem fit. I don't know how close this work is, or how loud. I had construction next door to me for 6 months but gave no discounts. Mostly it happened during the day when people were out. By afternoon they knocked off, nobody worked weekends. So at the most they would have heard it for a couple of hours. Nobody complained.
Yet every situation is different, yours might start at 7am and go all day and night!