Im fainting at some of these prices, shower grate drain is about $500, which includes extra labour cost.
Tiling was $70 Metre including porcelain tile cost and laying,
Paid nothing extra accept buying my own mortar for choice of mortar colour.
But I had a project manager builder who ran the job and i was officially the builder.
The reason up grades are so high is that big buikders buy limited ranges really cheap, , for example bricks might be purchased by them at $350 per thousand, most bricks retail at $650-1150 depending on brick, when u upgrade it goes new brick 850 minus your brick 350, so thats $500 x say 25000 bricks is $12500 plus builders margin 20 percent is another $2500, you get $15,000 extra charge , , thats without mortar colour choice.
For extras you get charged full retail plus builders margin, but credits are the rock bottom basic range at near wholesale levels, as a rule with lots and lots of upgrades , they become more uncompetitive.