A workshop room in a house is just a room. People redecorate and change room usage between bedroom, study, games and other uses all the time. Unless you have made a major adaptation its no big deal. People expect some redecoration to suit their tastes. We looked at 2 houses with an integrated swimming pool. Now that is a hard thing to sell. We wanted those swimming pools a lot, but as you start to think of the upkeep implications, and how it might affect a future sale if you need to move, you start to see it as a nightmare. Even the property agents selling those places were giving us estimates for how much it would cost to turn those large swimming pool spaces into more rooms. One thing that struck me as odd was the way property agents presented houses with what in the UK we call a granny flat. A separate connected living space, where an elderly relative can live independently, but very close by. That seems like something that would be in demand, especially in the AirBnB era, but the property agents just talked in terms of the cost of integrating the flat into the main house.