We had a similar situation with our feature wall bathroom tiles. We chose 600 tiles for floor/walls and feature tile and wanted the grout lines to all line up around the room. However, the feature tile was measuring at 595 and the grout lines looked wrong. I was told that tiles sizes are ‘nominal’ and variations can exist in styles and even batches. We addressed the problem by off-centering the feature tiles, meaning that the horizontal grout lines on the feature wall tiles met half way through the regular tile so it looked deliberate, rather than a mistake. Does that make sense? Would that be a possibility for you? The problem with the tiles being 2mm out is that with every grout line you add another 2mm out so by the end of the row of tiles the discrepancy can be quite obvious.

two steps I see here 1. suggest you go back to council (either yourself or view builder if they are getting the permit) and question their particular interpretation of the reg 85, use the image posted previously and ask why "if a habitable room window is compliant when facing an open verandah so long as it's 1/3 open" an eave, which is 100% open and less overhang is considered to be non-compliant. If you have 1.4m offset from the boundary, and your eave is only 400mm, then arguably this window WILL be facing a light court with min 1m clearance to the sky (measured from the eave to the boundary) 2. If above is not accepted, then apply for the council "report & consent" process to vary reg 85. Best to discuss this directly with the relevant building surveyor so you can be confident it will be supported. Ask the surveyor specifically what that would likely need to see, such as do they want to see a bigger window of size Xmm x Ymm. You will likely need to submit updated drawings if the window currently drawn is on the min 10% of the floor area of the bedroom. It sounds like you may be out of your depth, and typically these report and consents involve response to Ministers Guidelines which can be tedious and you have to understand the technicalities and lingo, so perhaps it will be best to go back to whoever helped design/documented the building and get them to help you prepare the submission. It's now so close to Christmas/end of year and probably best this is handled after the flurry of the festive season has passed and people/admin/surveyors etc have some fresh energy and renewed patience.. Councils typically work on skeleton staff throughout this period so unlikely you'll get much of a difference in outcome timeframe wise whether you submit now or early new year. All it will do is be put in an admin pile and be addressed in due course Best of luck PD

It’s a bulkhead. In this case it looks decorative. It’s a lower plaster edge around the perimeter of the room. Some people install the down lights there. But really you should be asking your builder. You’re going to have a tonne of questions over the build might as well start asking now.

I’ve seen a requirement for perimeter concreting included in the contract as a warranty condition. If this is why you’re doing it you need to comply with the contract.