You’ll find a video below that runs through some of the tips mentioned here. In order to build functional rooms underneath platforms in The Sims 4, you essentially need to use your platforms as ‘walls’. Sims 4 platforms with functional rooms: Basic how-to tips It is also useful to know that Sims do not need to be able to walk on a full tile in order to access a bed on top of a platform, provided there is nothing else obstructing their route. It is also useful if you are limited in terms of height adjustment for your platforms (as with the Evergreen Harbor apartments, for example).’ This is quite useful for placing objects such as beds, toilets and sinks in confined spaces.