I missed this last year. Apparently Eugenie and Jack had wanted to love into Adelaide Cottage as their main British residence (they also live part-time in Portugal for Jack's work). But William and Kate successfully claimed Adelaide Cottage instead as their fourth or fifth house?
This apparently led to tension between the two families. Instead Jack and Eugenie live in Nottingham Cottage which has two bedrooms. They already have one child and Eugenie is pregnant. I am guessing this is why they wanted a slightly bigger house.
www.cosmopolitan.com/entertainment/celebs/a42035692/where-does-princess-eugenie-live-nottingham-cottage/