Referring old thread - https://forum.lowyat.net/index.php?showtopic=4289990&hl=mbsj from 2017

I'm currently finalizing to buy a 2-storey terrace house under MBSJ area. The seller informed that two extensions were done, one was with permit but a second one was without (5 foot by 22 feet area).

On calling MBSJ, the officer mentioned a formula (I think nine times square footage, the line was bad so I couldn't catch it, and then add the cost of the new extension application).

I'm planning to extend the upper floor to match current ground floor extension (all the way to back, 5 feet in front). Could anyone point me to any documents/guidelines which can used to estimate how much denda I need to pay to MBSJ, as well as how much the extension permit will cost? From random googling seems people talk about 3k, 5k, 6k or so?