Living in a dense urban environment requires making use of every bit of space available and those with money usually have the resources to take advantage of this. Case in point, penthouse prefabs. First Penthouse in London will build a prefab off-site to your exact specs in accordance to your building codes as well as building out any amenity you wish. All plumbing, hvac, and electrical systems are tested before installation which is finished in a day and ready for immediate move-in. If you’ve got roof rights or happen to own your own building in New York, Top Penthouse can also set you up with a prefab in the city.