From 4 electrician I asked, here is the price they quoted:
Power point
Price RM70 to RM80. For each additional power point beside the point need to add RM10 to RM15. So, if your power point have 2 output (or box, don't know the exact name), price is RM70+RM15=RM85, if 3 RM70+ RM15 + RM15 = RM100. 3 electricians quote me RM80 with RM10 for additional outlet, while 1 quote me RM70 with RM15 for additional outlet. So at the end, if I want 3 output, all give me the same price (RM100). All are the price with 2.5 cable concealing inside wall with pvc pipe.
Water heater
Price RM120. Don't know the cable size but thicker than 2.5 mm cable. The price not include installation.
Air-cond
Price RM150. Only ask 1 technician about this. Don't know why the price higher than water heater.
Normal lamp wiring
Price RM40 - RM50. This is normal wiring where they just loop from another existing fan or lamp wiring. Add RM5 for installation.
Fan
Price RM40 - RM50. Add RM15 for installation.
Exhaust fan
Price RM70 with installation. I don't install hood, instead I use exhaust fan.
Total is RM1500 with installation for my single storey terrace house. But I did all the lamp and fan wiring and installation my-self so total price is RM800 only for power outlet and CB.
New house electrical wiring, conceal inside wall wif/wifout PVC pipe Renovations