To give some concrete numbers here without bashing the original poster for being clueless, depending on the heat pump, you can fit all the technology (indoor unit, meter cabinet, house connection, small network cabinet) nicely into 4sqm. But then it really gets tight and maintenance work becomes very annoying. If you want to include the washing machine, etc., then 8sqm is a good recommendation, that’s alright. I would just make sure the room is at least 2m wide, so 2x4, so there is still space to move around inside. Also, there are a few regulations to consider. For example, I think there must be at least 1m of free space in front of the meter cabinet, etc. Try to concentrate the technology on one side or the back half and then buy some nice built-in cabinets (for example, we used Metod from Ikea) to create proper storage space. You can fit quite a lot in there. I also think the living area looks much nicer now. I really like the slight L-shape. Maybe you should also plan a sliding or loft door to the hall in the future, so the office is quieter. But you could also do that afterward. Using the sofa area as a passage, however, would probably annoy me a bit. I would probably swap the sofa and kitchen. Otherwise, someone is always running in front of the TV.