Wood Partition With A Door -- Need Quotation /advise

I would like to split a room into half and would need to do up a partition with a door (the normal hdb kind of wooden door will do)

I would need 4 such kind of partitions.

Anybody knows how much it would cost to do the partition per feet? including the labour and material cost. (no hacking is needed)

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From my knowledge, if we build partition using wooden walls, we no need to get hdb approval right?