Measuring the square footage of each room you plan to paint is an essential part of the process. To calculate square footage, multiply the length of the room by the width in feet:
Length x Width = Area in square feet.
If the space isn't a perfect shape, section off the room to make squares or rectangles and measure each section at a time. Add the square footage areas together to get the total square footage of the room.
As a general rule of thumb to know how much paint you need, 1 gallon of paint is required per 300 to 400 square feet. If you have textured walls or choose thinner paint formulas, your project may require more materials.
To err on the side of caution, overestimate by purchasing 1 gallon per 300 square feet. To get a general estimation, use this equation:
Total square footage / 400 = Number of gallons of paint.
For example, if your house is 2,400 square feet, you would need 6 gallons of paint (2,400 / 400 = 6).
Interior painting is a pretty simple job that most homeowners should be able to tackle, and you’ll save an average of between $1,700 and $1,800 by doing the work yourself. Most DIY painters can expect to pay $200 to $300 in painting supplies when grabbing paint, primer, tape, brushes, drop clothes, and other odds and ends.
However, while hiring a professional is expensive, you’ll save yourself hours of time and also get a professional appearance in your home that’s hard to achieve as a DIYer. For the best results, hire an interior painting company in your area.
Doing so will also land you with a warranty for the work in most cases, which you’ll never get with a DIY job, and you’ll often get recommendations on colors and sheens. If you’re considering a whole-home color palette or need some interior decorating advice, definitely consider enlisting the help of a professional painter.
Oil-based paints contain higher volatile organic compounds (VOCs) than latex paints. To limit your exposure to VOCs while painting indoors, keep the area well-ventilated, wear respiratory protection, and avoid the painted area for at least 72 hours once finished.
While you’re budgeting for an interior refresh, you might want to consider the following add-on services to maximize the impact and increase home value even further.
Cost to replace light fixtures: $150 to $1,000
Cost to install crown molding: $600 to $2,100
Cost to refinish wood flooring: $1,100 to $2,700
Cost to replace interior doors: $360 to $1,200
Cost to replace windows: $3,400 to $11,700
Cost to replace kitchen cabinets: $2,000 to $11,000
Whether you decide to DIY your interior painting or hire a professional painter, you can use the tips below to reduce your overall costs.
Do the prep work yourself. Save on setup and cleanup by tarping off furniture and fixtures and tapping off the area ahead of time.
Carry out drywall repair if possible. Reduce the time painters spend on repairs by fixing holes or scratches in the walls before they arrive.
Paint trim and ceilings at the same time. You’ll spend more up front for these added services, but you’ll save overall since the painters will already be on-site for your walls.
Buy the materials yourself. Some painters might mark up materials, especially if they need to take a special trip to buy them. Purchase materials yourself instead to save a bit of money.
Be discerning about what you paint. Sometimes, it makes sense to paint the entire interior of your home, but you can also hire a pro to tackle only the main areas to get the biggest bang for your buck. You can then tackle the bedrooms that guests won’t see on your own.
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We’ve surveyed over 30,000 real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
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You should repaint the interior of your home every three to 10 years. Depending on your lifestyle and family, such as having small children or pets, you may need to repaint more often due to wear and tear. The repainting frequency also depends on the paint type, surface location, and room type.
The general rule when painting a home on your own is one day per room. It can take longer based on room size, drying times for a particular paint, and the number of coats used. If you hire a professional, the team of painters will usually work more quickly. With a professional doing the job, you’re looking at one to three days for the entire home, depending on the number of coats you need and the size of the team.
While it may surprise you, the best time to paint the interior of your home is not during the warm open-window months, but rather during the late fall or even winter. This is because the cooler months offer ideal humidity conditions for painting. Lower humidity and cooler temperatures means faster drying time and better paint adhesion.