House painting is no easy feat. While you may be tempted to purchase the cheapest kind of paint you can find, remember that you want the paint to look good and last a long time. If you haven’t chosen a color palette, there are a number of apartment design apps out there to spark inspiration. Once you’ve decided upon your color scheme, you’ll have to choose what kind of paint you want.

An example of the wall measurement would be: 40 linear feet of bedroom space, x 8 wall height, =  320, x 2 = 640. Minus 1 door (60) and 2 windows (80) = 500 sq feet being painted. Then divide the 500 by 400 (sq feet per gallon), and you get 1.25 gallons (4.73 L) needed for that room. For this, you'd need 1 gallon (3.8 L) and 1 US-quart (950 ml). If the amount it comes out to is over 1.3, we recommend just getting 2 gallons (7.6 L) so that you have leftovers if needed, since 2 US quarts (2,000 ml) costs essentially the same as a gallon in most stores.
You might pay an additional $1 to $5 per square foot for optional repairs and updates. Consider having your molding, trim and baseboards checked while you have a professional in your home. This might be a good time to upgrade or repair any cracks, warps or other issues. Pros can usually touch up or replace these items for an affordable rate, and they may even package such fixups with your project.

Many new homeowners want to change the color scheme of their rooms, either as a way to personalize the space or match the walls with existing furnishings and artwork. Interior house paint is relatively inexpensive, and it doesn’t require complicated machinery or professional-level skills to apply. There are also thousands of customizable colors available, as well as a choice of finishes, such as matte, semigloss, or gloss.
Power washing – $0.42–$1.40/sq. ft.. You might think you can save some money by power washing the exterior yourself, but homeowners can get a bit trigger-happy with a power washer in their hands. The pressure from the washer can take them unawares, breaking windows, leaking water into window frames and siding joints, and gouging wood. It’s probably wiser to use a hose and scrubbing brush. Rinse off any cleaning solutions thoroughly.
Painting exterior windows depend on the size of the window and the number of panes. To calculate the price for windows larger than 15 sq. ft., add 1’ to each side of the window and then multiply width x length. Add two sq. ft. for each window pane for painting the mullions, muntins, and sash and then multiply your total sq. ft. by $84/100 sq. ft. So a 4’ x 4’ window with 4 panes will come to a total of 44 sq. ft. x $84/100 sq. ft. = $37.
Premium Plus Interior Ceiling Paint 1 gal. features Premium Plus Interior Ceiling Paint 1 gal. features a durable, acrylic-latex formula that is specifically designed for use on previously painted or primed interior ceilings. This spatter resistant formula minimizes glare and provides a mildew-resistant finish. This formula also maintains the original acoustical ceiling properties.  More + Product Details Close
After you have done the multiplication, subtract about 40 sq feet per window, and about 60 sq feet per door. Divide by 400 (interior paint covers 400 sq feet per gallon). The number that remains, is how many gallons you will need. If doing multiple wall colors, then you should do this process for each room (or sets of rooms) with a particular color. 

The average cost to paint the interior of a house or room is $1 to $3 per square foot. Painters charge $1,200 to $3,900 to paint the walls in a house interior, and the cost to paint a room is $350 to $850. Prices increase when including the ceilings, baseboards, and trim. Get free estimates from interior painters near you or view our cost guide below.
At least 90% of painting time goes into setup, prep work, and priming. The method of prepping required varies for each type of exterior material on the home, but every project must be patched and cleaned. The more thoroughly you prep and prime your home’s exterior, the longer your paint job will last. You could save quite a bit if you do this part yourself, but it must be done correctly, or your contractor will have to go over what you missed. The prices mentioned are based on paying a contractor to do each job rather than one overall quote for the work from start to finish.
Staining a deck costs $540 to $1,000. Covered porches might hit $2,000. Consider negotiating the price a bit lower by combining it with a full exterior job. Painting handrails can run anywhere from $1 to $2 per linear foot, depending on whether it’s wood, metal or some other material. Although you might think this is an easy $30 to $100 job, most painters charge a minimum fee regardless of the size of the project. You’ll probably end up paying at least $150.
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