I need help figuring out if AIBU. We've got a 3 bed house, a 3 yr (f), a 5 yr (m) and an 19 yr (sd). 3 yr and 5 yr currently share a room, 19 yr has own room and splits time 50/50 between parents, so 3 nights week minimum at ours. We can't afford to move to a bigger house in the same area and we applied for planning for a double storey extension but it's looking like an extension is not going to be affordable or worth the cost for what the planning authority will grant . I also WFH full time and my desk is in our cramped bedroom. I've suggested instead that the younger children continue to share for the next 4 years or so, and that we build a small single storey extension or garden room onto the back of the house which will be an office. I've suggested that when sd turns 23/24 yrs shell be old enough not to have her own room and can have a day bed in the downstairs office to stay on when visiting, and kids at that point have own room. My husband is acting like I've suggested making sd homeless and that I'm an awful person. Really?! I moved out when I was 16 so maybe my perspective is influenced by that but I would not expect to maintain space for a bedroom for a grown up child in their 20s when we're desperate for space and I don't think it's unreasonable to suggest?