Our house started out as a bog standard 4 bed detached with integral single garage, built about 15 us ago. The people before us did a big loft conversion and added 2 bedrooms and a bathroom, so although we love the space, it feels a bit top heavy. On the ground floor we have a big kitchen-diner running the full length of the house, a lounge and a downstairs wc. We have a toddler and are expecting twins so it'd be great to have a playroom to contain all their gear. The obvious solution is the garage. The house would end up essentially double fronted, and there's a same designed house up the road where they've done this and it looks nice. The drive is wide enough for 3 cars and the garage has is currently just for storage. My H worries that converting will devalue the house. Is he right?