You should ask your builder why he is reluctant about 3 metres ceiling heights on the upper level. It is more work for him, so he should quote appropriately, and be paid for the extra height, the extra materials, the extra scaffolding etc. If you are building as an investment you need to understand your market. Will people pay extra for the extra high ceilings so it is profitable for you? In some really expensive areas homes with ceilings less than 3metres are looked down on by the buying public. In poorer areas people are more interested in square metres of floor area than ceiling height so you would lose money by putting in 3m ceilings to both floors. When building townhouses you need to think with your head, and not with your heart. Everybody loves high ceilings, but make sure that you increase the door and window heights proportionally. Standard height doors look funny with 3m high ceilings. This is one of the reasons why 3 metre high ceilings do cost so much more as you need everything taller, including window furnishings for it to look right. If you are building townhouses for future rental you will need to outweigh the additional cost of the extra height with the small increase in rent that could be achieved. While you say the height limit is 11 metres, it probably isn't 11 metres when it is close to the side boundary. Many townhouses are built close to the side boundary so you should check with your council about the side setback requirements. Usually the taller the building the further it has to be from the side boundary. Best of luck Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits

I have came across waterproof laminate floor with 15 years waterproof warrenty. Please see Quick Step Laminate Impresive Ultra floor boards. They look quite impresive. I am trying to decide between waterproof laminate and hybrid floor. Please see my post here https://www.houzz.com.au/discussions/6004056/laminate-vs-hybrid-waterproof-floor-board#n=0 Can you please give your input?

I would suggest Luxury Vinyl Tiles, especially for a kitchen where the floor could get wet.

electric underfloor heating is great for bathrooms (and laundry, mudrooms, entry and hallways when it needs to be left on for weeks at a time and not much good for a ten minute shower) and is preferable to anything visible like hydronic heaters that take up wall space but your voids will suck most of the heat upstairs ..our reverse cycle AC has been much more economical to run than the whole floor electric slab heating that we had in our previous house (supplemented with a wood burner and gas log fire in our cold climate) but we made sure that the void over the stairs was able to be blocked off to zone heat downstairs with separate heating upstairs but having lived in different areas of Sydney i'm wondering why a new built well designed house with great insulation would need more than modest supplementary heating that can be more economically provided with AC