Suspect my windows or area surrounding is leaking.  During rain, water seems to flow out from under the paint/cracks surrounding the window.  Pretty severe during heavy rain, actually can form a pool on the floor on some occasions.

Contractor has not surveyed site but has suggested PU injection.  Quoted over RM 1k.  Area is just 3 aluminium windows in single frame.

Is that rate normal?  Any other recommendations?  Is DIY possible or advisable in this instance?

Apartment, not able to take outside photo atm, update later.
Nope, normal open/close window.

Main query atm, is the rate of RM 1k + for PU injection for just these 3 connected windows normal?