Depending on the property (and the budget), both options have their merits. A big loft space can be more easily converted to a room but often the structure or space isn't sufficient and an dormer or extension is needed. This can offer a whole new floor to the building and with some imagination you can transform the property completely. www.pwjarchitects.com

i know its cheeky but maybe knock on the door and ask the owners if they converted the loft and which building company they used? This is the most direct route. You could also contact loft specialist companies and request a ballpark quote based on the plans you have posted. The cost will also depend on the specification, the findings from a site inspection and various other factors. You said you have your eye on this property. Have you viewed it or made an offer? If you can show the buyer that you are seriously considering making an offer they may allow you to bring a builder to a second viewing.

Hi, For your attic conversion, maximising space is key, especially with your super king-size bed and desire for a walk-in wardrobe. Consider using the sloped ceiling for hanging space, with custom wardrobes or alcove storage that includes shelves, hanging rails, and baskets for shoes and bags. A sliding door to the en suite is a great space-saving idea, while under-bed storage can help with additional items. If a full walk-in closet isn't possible, open shelving or a clothing rack can provide stylish, accessible storage. You could also dedicate a section of the room as a closet wall with a mix of hanging and shelf space. A tailored, built-in approach will help make the most of your attic’s unique layout.

Thanks Jonathan – a really helpful response. If you don't mind, here are my thoughts on your points: “I think that eventually at least 2 sisters (possibly all three girls) will move to this floor so you might want to make the shower room just a little larger to accommodate all the products they will eventually ‘need’.” That’s the plan – we’re aiming to move two daughters up there for now, and we’ll see how it goes. Good point on the shower room – would you suggest enlarging it by shifting the wall between the shower room and Bedroom 4? I still need to think about the interior layout of the shower room. “You might want to consider the front bedroom and where you would put furniture – probably moving the doors to the loft space.” I’ve been thinking about this. Here’s how I imagine the furniture layout (still need to add smaller pieces like a desk): I liked your original suggestion of placing the bed on the sloped side – I’m picturing eaves doors on either side of the double bed. “Also the roof windows in there seem ginormous.” That was intentional! I asked for the largest possible windows, ideally using coupled flashing (with either an 18mm or 100mm gap) to maximise head height around the bed (like this). I’m also hoping to minimise the central pillar between them to help the head height and to allow the headboard to go against the vertical wall below the window. Do you think that’s too much? “And if you have a Velux above the stairs consider getting an electrically opening one to help heat escape on hot days.” Thanks – I’ll look into this. Thanks again – Appreciate your input!