With that said, here's the reality of that particular scenario. Painters do put water in the paint, but not for reasons you would think. Some materials need to have their viscosity manipulated in order to slow drying time, allowing gravity to 'smooth' out the product for a better finish. It also prevents 'drags' and 'sausages'. I personally try not to do it too often, but from time to time I have to. I want my client to have a proper finish.
I had originally budgeted a lower amount for this project....painting had always been a DIY project in this home, so I didn't have a clue.    Now that I'm older and less nimble, I decided to hire it out.    Waldner's Handyman Services was very professional and worked with me to understand how costs were factored into my painting project.  I am very satisfied with the finished result and will use them again for future jobs. 
This article with comments was terrific - it was so informative. I found the advice useful. It addressed specifics like the condition of the dry wall surfaces, any additional repairs such. pin holes, chalking, smoothing of wall surfaces, absorption of paint and number of coats that may be needed. It should also include insurance coverage, and reflect the clean-up afterwards. Having a written contract with the company's letterhead is a must.
Pros take a "load and go" approach to painting. They load the bottom 1 1/2 inches of their brushes with paint, tap each side against the inside of their container to knock off the heavy drips, and then start painting. By contrast, homeowners often take a "load and dump" approach of dragging the loaded brush along the sides of their container and wiping off most of the paint. "It doesn't do you any good to dunk your brush in paint, then immediately wipe it all off," a 16-year veteran painter says.
The cost to paint a room will vary based on the size of the room, the type of paint you select, any ceiling or trim work needed, and any repairs needed. If no repairs or other additional work is needed, painting a room with contractor-grade paint could range from $1 to $2 per square foot, including materials. Selecting a luxury paint (some cost more than $100 per gallon) will certainly increase your house painting costs. Here are some additional examples of average house painting costs, per room:
We hired Warline painting because we felt confident in the colour consultation that Heidi provided. All the other paint companies we had quotes from were not interested in colour and we would have to pick it. We all know how hard that can be. Thanks to Warren and his very descriptive estimate and Heidi's knowledge of colours, we completely updated the outside of our home with a new colour and paint. Love it!!! Very pleasant experiance with Warline.
We are a custom home builder and use Warline Painting. At Kingdom Builders we measure our projects success based on quality, schedule, budget and to never disappoint a client. For us to be successful we evaluate and track the performance of our subtrades to ensure our expectations are achieved. Warline Painting is they type of company we like to work with. Not only can they meet our expectations but they do it with ease. They take pride in their work from start to finish. They stand out because they are very efficient, monitor their own quality, offer colour consultation services and are cable of custom staining & gold leafing, which they did on our most recent project. We recommend Warline Painting!
Second: all the tricks of the trade in regard to "cheating" customers is for hustlers and cheaters and NOT established businesses. At the end of the project the job should come out looking professionally painted as specified in the contract. A selected color that takes multiple coats that was not calculated by the contractor should cost more money. It's not the fault of the painter.
Discovering what it cost to paint the interior of a home can be a little tricky. It all depends on several key factors: the type of paints, the amount of prep needed, how many coats, how large the space is and the amount of protection needed to non painted surfaces and areas. We have painted a bedroom that can take just a few short hours and cost $300 or so dollars on one home and then spend over a week painting a bedroom with two painters and cost over $5,000.
After painting the ceiling, work from the top down: Start with the crown molding, then do the walls and then paint the casement molding around the windows and doors. Do baseboard molding last. "Painting the baseboards last keeps dust and grit from traveling off the floor, onto the brush and then up onto the freshly painted casements," explains Weeks.
The cost to paint an average size room (10X12) ranges from $380-$790, not including ceilings, trim or cost of the paint. DIY, this can cost between $200-$300. When estimating the cost, painters will start with how much paint will be required to complete the job. To know this, they first need to know the size of the area to be covered. The easiest way to calculate the size of the paintable area is to add together the length of the wall and multiply it by the width of the room from floor to ceiling. The resulting amount is the room's square footage. This total is a starting point, as it is not all paintable surface. The painters won't paint the windows and doors, for example, and they must account for ceiling trim and baseboards as well. The next step is to subtract the area of the doors and windows -- along with the square footage of the trim and baseboards -- to get an average. Then, use the same calculation (length x width) on the windows, doors, trim and baseboards, and subtract all of those numbers. The result of this equation is the square footage of the room's walls. This is your surface area number. (Painters will typically add a little square footage back in to this amount to account for extra paint, which may be required.)
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