Hey! Your question seemed to me very interesting, so I will be happy to answer him! I think your neighbors people understand and will not be against the elevator in the house. And if any problems arise, it can solve both the contractor and you. I can advise you to advise the Pete Suen platform, where you can find answers to all your questions. As for the price, it can vary depending on the quality of the material, the length of the elevator shaft and the elevator size themselves. I hope at least a little, but I helped you. Good luck!