It really depends on your needs, budget, and a few other factors. Some companies do very well with home additions, while others do better with full prefab homes. It also depends on how much customization you want. Northgate Industries Ltd manufactures, transports, and installs modular buildings They offer rentals, sales custom buildings for you. Best thing about their service is that they offer customization on all their products and services. I would recommend them. For more information visit northgateindustries.com