Cost of 1 extra ensuite

Dear all, for a new build, within the same house footprint, how much would 1 extra ensuite (~4-4.5 m2, mid-range finish) likely cost? I mean, without changing the total area build, if I ask for 1 more ensuite bathroom, how much $$ extra would be a reasonable charge from the builder. Anh the other way around, what if I take out one ensuite bathroom, will the builder usually deduct the same amount? Any sharing or a rough estimate would be greatly appreciated. Thanks, everyone!

I don't have much experience, but I have been quoted a $5k credit to turn an ensuite into a WIR and a cost of $3500 to add a shower into a powder room (cutting into a different WIR)

So I would guess somewhere around 15-20k including tiling etc

htn2021

approximate quick breakdown:

Waterproofing - $400

Tiling (including Screeding and installation) - $4500

Fixtures and Fittings - $3500

Shower Screen - $1000

Electrical - $1500

Vanity - $800

Builders margin - 20%

Total = $14,040 so budget $15,000.

Thank you diepiggy and Ashington Homes for the very helpful information. I checked also many posts from Ashington Homes and was grateful for the generosity of sharing the costs and information, not just this one, but also many other posts.