Hi TS

By right, any paint work starts with 1 undercoat and 2 coats of paints. At least that's how I do it. Maybe other painters have other skills as well

But the thought of have glossy paint for ceiling? I've never done it before as i think it's a bit risky if the ceiling works are not properly done or need touch-up. I don't mind the joining, but I think you better make sure all the holes/wiring needed for lightings/fan are done (but not yet installed) before the painting starts, cause once the ceiling needs paint touch up, the result might disappoint you. But i'm sure you hired a good ID/contractor so share us the photos once it's done ya

Normal matt paint is called emulsion (water based). For apartments/condos/terrace houses, here's how they normally charge you

1. By labor charge
RM100-RM150 per skilled person per day (excluding paint & related paint gears)
*note: hiring a general worker might be cheaper though

2. Lum-sum
RM3.5K to RM4K for a complete whole house ceiling & wall interior painting works below 1500sqft (depends on brand & wall/ceiling condition, excluding doors)
*note: main-con charges

This is pretty standard for residential paint job. For commercial, price may slightly be higher about 10-20% more cause you know-lah, they need to pay parking, floor covers, expensive food etc. Overall prices can be cheaper or higher depends on who you dealing with