ammonite

For the parquet itself, it really depends quite a number for factors, size of planks, type of parquet, adding skirting etc. My friend went with the Floor Gallery, Did 360 sqft in his living room and came up to 25 SGD psft, plus additional 500 dollars for skirting. The existing floor tiles had to be hacked away for about $1000 plus an additional $2000 for screeding. So that's already around 12.5k, I'd benchmark and multiply by 3 to get 37.5k for your floor area but it would be just a layman's estimate.

You may not be paying the GST of the contractor and materials, but wouldn't you still end up paying the GST in the profit margin to the interior designer in this case then?

The website of this company now redirects to the website of a newer company called Mow Interior. Believe the director also goes by a different name now.