Okay, I used to do this, so I will give a little input.
Do not take out for any windows or doors. You have to cut in around them, meaning just as much work. The only reason you consider the windows and doors would be for paint calculation.
Cutting in a couple of rooms first then having someone roll behind you is perfectly okay.
If the sheetrock is new (previously unfinished) you can save a little by buying a primer that is for new sheetrock, but if it's even amount of new/old walls - get regular primer.
When it's a whole house: every wall, then the out exterior sq. footage may work for your final sq. ft calculation - if there are tons of perp. Walls and partions. If it is pretty choppy, then go with your interior walls:
ex: 10 foot wide x 8 foot tall (to ceiling)
A wall room: 10 + 10 + 6 + 6 are your walls widths then times that total by your height of you walls. 32 x 8. Again, don't take out for windows or doors unless they are very large. Cutting in all windows and doors takes more labor time. The only reason to do this is to figure out how much paint you will need.
If you have a lot of prep work on the walls, you will want to add that to your time/materials. If you have ceilings, add 15% on top of your normal sq ft wall price. Overhead work is more.
You do add for trim. If it's a different color, then you need to add for LF cost to paint all trim. 7" base is at least 45-50 cents per foot.
Do not use FLAT paint. Use an eggshell finish. It is still flat, but it will cover better and quicker. Flat is out in most situations. It is also easier to clean. This will help both on your labor and on the homeowner. It cost's a bit more, but you more then make up for it on labor time.
Some inexperienced painters try to put too much paint on when they roll and brush - watch out for this. More of a mess and it doesn't look good, or save you time. Nice even coats. Then you have the ones that try to squeeze out as much paint as they can by pushing hard on the roller. Either way is not good. Okay? Then, do not use the cheapest roller either. Lot of lint and more work.
Use good brushes too. Can't tell you how much better it looks, and how much easier the job will go.
I like to use acrylic satin on all trim and doors. A good one. It's just enough sheen difference without being noticeable, and the work looks great when you are done and it's glides on that trim and doors like butter.
There, any more questions?
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