‘Prefabricated’ houses appeared in the Second World War as a necessity. Fast reconstruction was the need then.
These days, prefab houses might be a new trend. The need they should be fulfilling now is the increased demand of homes and the super-fast pace they should be built.
The UK is one of the main countries in which this need can already be seen on the property market. However, prefab homes are going to bring some new problems to the market, starting with viability, and ending with insurance.
A good point of view on the problem of creating new communities based on prefab houses can be found in this article on Property Division:
Are prefabs set to make a comeback?
And if you want a clear image of how how prefab/ fast houses can look like, here are some ideas:
Photo sources: Inhabitat