Yes the pricing does change, and quite significantly. I have worked inside the paint industry on counter sales outside sales and application for over 10 years. One thing many people do not understand is, the resins in the paint are more expensive to produce the higher the sheen goes. Therefore the company is at of higher cost making the paint, which in terms they charge more for the paint. I have seen a 15$ variance between flat-semi-gloss it is not uncommon and is not unrealistic to pay more for a higher sheen. Another thing to add is when doing samples on your wall prior to a painter coming is a good idea, however do not do them in huge squares with heavy coats, remember you are just wanting an idea. A lot of times the issue comes up of the paint not covering the sample coats, in fact it is covering quite well, however the paint sample applied is often times much darker than the wall color, creating a contrasting difference from the lighter surrounding wall and the sample placed on the wall. I recommend getting a piece of sheet rock and using it for the samples so you can move around with it etc.
A fellow (actually lives in the same neighborhood) by the name of Wayne Hickey (843-655-0366) painted the ceilings and most of the walls of our house in February 2017. He got paint all over my light fixtures, all over my trim around the doors, and had visible lap marks everywhere on the walls. He came back and rectified some of the problems, but not all, as I have noticed as I have had time to look more carefully at the work he and his assistant did. His assistant had no idea (not a clue) how to roll paint on a wall or ceiling. Some places were not covered. He said he would pull nails for pictures and then re-insert the nails exactly where they were. This he did not do as he promised. He painted over the nails. His assistant had no idea how to use a paint roller. I have painted all my life, and would have done this work myself, but I just had a full knee replacement and the other knee is in bad shape. I just could not do the work. Wayne is a pleasant and congenial individual, but he can not cut in a ceiling or wall to my satisfaction - not even close. He should have a putty knife and wet cloth with him all the time to correct any paint that might get applied where it shouldn't. That is something I always did as a painter. I would not recommend Wayne to paint anybody's home.
The other difficult part is getting a painting contractor to show up. While this generalization does not apply to every painter, personally I am extremely grateful if I can get a paint contractor to show up to look at the house and to later produce a written estimate. I hardly fault the painting contractors, because I think it is a combination of the contractors being smaller operations along with a high demand for their work.
Third: The contractor buys the materials. We get them at a better rate and customers really don't know what they are getting into by being a material racer. Once again, I'm not referring to the guys that paint a bedroom or 2 a week. Tell the homeowner to go grab 50 gallons of paint, $300.00 worth of sundries and related job cost items and I'd be interested to see how it works for them....IT WILL NOT. And if were talking about people getting taken advantage of here, the paint suppliers with no relationship to a homeowner will 100% GOUGE the customer and completely take advantage of them with pricing. Contractors will pay nearly half the price and will still save the customers money marking up paint 10-15%.
Beginning with the prep work and ending with last coat of paint or the finishing, an exterior paint job will last anywhere from one to two weeks. After completion, homeowners using low-quality paint will need to repaint every four or five years to keep it well maintained; homeowners using high-quality paint can go longer without a new coat -- usually about seven or eight years, depending on the type of paint and material.