super insulated corrugated iron or modern fibro are good cheap external wall cladding but check out cost of cladding including all labour and suitable insulation to compare values..then, research local council and check any covenants then you need a floor plan designed to suit the orientation and outlook and trades wages cost the same to install cheap materials so aim for products that can be DIY and/or are quick and easy to install so that savings in materials are not used up in extra labour and don't just reduce the size of all rooms, a house with 3 good sized bedrooms and space for an extension is much better value than a house with 4 small bedrooms and no room to extend without destroying something else

Always seek professional assistance. Be it a colour consultant, designer or a house painter. Always good to bounce your ideas around here as a lot of good advise is given, certainly if you're not sure of where to start. Have a chat to a local house painter, they're the best ones to give solid advice. Paint brands are usually pretty good, certainly the well known ones like Taubmans, Wattyl, Solver, Dulux. Trusted brands been around for decades. Colour consultants are good as they live and breath colour schemes. They can come up with colours to use that the rest of us wouldn't even think of. Terracotta roof is timeless and classic so you're certainly not limited.

if it's only ten years old it should be modern cement fibre sheets without asbestos and is usually a single thickness framed wall instead of the double thickness of a brick veneer wall ... to save space and the sheets may need cover strips over joints and ongoing painting and potentially less insulation inside the walls

once you identify any structural issues and considered advice from an engineer but i suggest that the bricks were probably never meant to be exposed and the render was part of the structure...,is it a single or double brick wall, is there an internal framed wall, what about insulation? depending on the look you prefer it might be better to add external cladding eg corrugated steel or Scyon weatherboards to allow for an air space to improve insulation as well as weather proof the building after the wall is made structurally sound