Hmm potentially although I suspect I couldn't reach to the back of it. Definitely not to do the alternating coloured panels I initially wanted but maybe with a roller on a pole....thanks for your suggestion, will look into it!

Thanks, but it needs a long pole as I don't want to climb on something to do it. Unless you can get it with a long handle. I think I would be getting wet anyway. Will have to wear a rain poncho!!

attached plan as stated is about 169sqm but the difference between 10cm and 20cm outside walls was about 10sqm (ie 150sqm) ...allowing for the internal walls or the actual size of the footprint including the eaves? could be where they find the extra ...best solution is to ask them to explain how they calculate the size

depends on the type of tiles and climate but our old concrete tiles lasted almost 50 years and had been repointed and painted in the last 15 years but ongoing problems with waterproofing convinced us to replace the old tiles with Colorbond steel roofing, fascias and gutters...(we also vacuum cleaned the roof space and installed new ceiling insulation, replaced all the old electrical wiring and added a power point and light inside the roof for future inspections) not very glamorous but the $150 we made from recylcing the old wiring was a nice surprise after all the hard work and expense!