It's horrible when this happens. There is a road near us, beautiful houses, in the region of a couple of million each, used to be surrounded by fields. They have just compleged building flats directly opposite and now they are actually building a housing estate round them. Literally as one finished the next one started.
They all tried to sell, at one point they all had for sale signs outside, there is only about five of them. I, not sure any did as I never saw a sold sign, and the for sale ones were up for ages, before slowly they all came down.
You can hardly drive up the road now, I went up it today. it's a total pain in the arse, there are vans all along one side, and it's a muddy mess, and construction workers everywhere, you have to wait ages to be able to find a gap in the traffic and get past the parked vans.
I really would prepare for this if you can't sell. It will be disruptive.and as said, I think the horses will need to be moved, at least during construction.