Labour for painting double storey house in klang valley should be between 3k to 3.5k. Mostly does not include painting the windows grille and gate. To do these, they may charge additional.
Some painter will charge more if the condition of you wall is bad and requires touching up before painting.

However, I have received quotation for 5k and he claims that his workers are experience. Don't really know how good are they as I never use his service.