So we are planning an l-shaped double storey extension this year.
The way the house sits on it's plot and the restrictions etc means that we will have a small office room at the front side and then behind we can either have a utility room off the kitchen to the side and a huge playroom at the back running the length of the house plus new extension or we take down the external wall extend the kitchen out then use part of the playroom as the utility toom then the rest of it as the playroom.
Second option means more disruption and a whole new kitchen but would lead us to have a huge open plan kitchen/dining room (about 7m wide), if we keep the existing kitchen we would still have a 4.5m kitchen/dining room.
I think long term the extra money and hassle would be worth it as I think a larger kitchen is more useful than a large playroom at the back of the house. The playroom will still be about 3.5m x 4m so not exactly small.
We are about to become a family of 6 as well so I think a good space to eat in the evenings with a large dining table would be a better idea.