Assume the width of your land to be about 10 metres, a possible estimate would be about 4,139.56 square feet Consultants fee = $35,000 Other miscellaneous government fees = $25,000 (or less depending on submission required) Prelimiaries = $70,000 (Assumed no piling / about 9 months construction period) Structural Works = $250,000 (No Piling) Metal Roofing & Roof Steel Structure = $75,000 Architectural Works = $420,000 External Works = $60,000 Provisional sum for tiles, ironmongery, light fitting, sanitary wares, built-in furniture, etc = $150,000 All-in about $1,085,000 These cost are estimate & depend on the actual outcome of the design. I'll be able to help if you need further advice.