Here are the answers to your questions;

1) We do have 1 room painting services.
2) Currently, the price for painting 1 room is from $350 onwards.
3) I would suggest do the electrical re-wiring first before painting.
4) No, the brand does not affect, but the type of paint does.
5) Thank you for informing.

Here is the link to our form filling;
http://www.singaporepaintingservices.com/painting-services-quotation.html

I cannot find where is the form you mentioned in your comments to post, but I do have some inquiry to make:

1. I want to have a room painted.
2. 2 walls of white and 1 wall of mint green + 1 ceiling—> how much do you charge?
3. Do you reckon I do all the electrical re-wiring before painting or should I paint the room first?
4. Does the brand of paint affects the painting fee?
5.By the way, i am staying in a 4-room HDB flat @ Tampines St 11.

Hope to hear from you soon!
Thanks!

The painting of the room will range from $250 to $320. As for the plastering, we will need to view it before we can give you an actual quote.

We can start this Friday or Saturday on painting your study room. It’s roughly $250 to $280. Do contact us using the form here.

It will depend on how many coats you are applying. I think you should purchase 5 litre for 2 coat (1 room) should be enough.
Hope it helps.

SingaporePaintingServices.com

Thanks for the comment. It will cost $1200 to $1600 using Nippon Matex. You can choose up to 3 colours for the walls, and the ceiling will be in white. Meaning there will be 3 (walls) + 1 (ceiling) colours.
If you want to use premium paint like ‘Eash Wash’ or ‘Nippon Odour-less’, it will be $1500 to $2000. You can choose up to 3 colours for the walls, and the ceiling will be in white. Meaning there will be 3 (walls) + 1 (ceiling) colours.