How to Paint a Room
Learn how to paint a room from prep to final coat. Covers choosing paint, taping, cutting in, rolling, and cleaning up without ruining your floors.
We painted our first room with a $3 brush from the dollar store, no tape, and way too much confidence. The result looked exactly like you would expect. Uneven color, paint on the ceiling, and a mysterious drip trail that somehow reached the floor from six feet up.
Painting a room is not hard, but it is one of those tasks where the prep work makes or breaks the result. A professional-looking paint job is 70% preparation and 30% actual painting. Skip the prep and you get wobbly edges, visible roller marks, and paint on things that should definitely not have paint on them.
The prep itself is straightforward. Tape the edges, cover the floors, and prime if needed. After that, the actual painting goes fast. A standard bedroom takes about four to six hours from start to cleanup, including drying time between coats.
This guide walks through the full process in order. Follow it step by step and your room will look like a professional did it.
Paint (measure your walls to calculate how much, or use the formula in the FAQs below). A roller frame with a 9-inch roller cover (3/8-inch nap for smooth walls, 1/2-inch nap for textured walls). A 2 to 2.5 inch angled brush for cutting in edges. A paint tray. Painter's tape (the blue kind, not masking tape). Drop cloths or plastic sheeting for the floor. A step ladder for reaching the top of the walls. A paint can opener or flathead screwdriver. Stir sticks. Damp rags for wiping drips. Optional but helpful: a paint grid instead of a tray, and an extension pole for the roller so you can reach the top of the wall without the ladder.
Choose your paint and color
Go to the paint store with your room measurements. Tell them the room size and they will help you calculate how much paint you need. For most colors going over a similar shade, one gallon covers about 350 to 400 square feet, which is enough for a standard 12 by 12 foot room with one coat. You will need two coats, so buy two gallons for a medium room. Choose a sheen level: flat or matte hides wall imperfections but is harder to clean. Eggshell is the most popular choice for bedrooms and living rooms because it has a slight sheen that wipes clean. Satin works well in kitchens and bathrooms where moisture is a factor. Semi-gloss is typically reserved for trim and doors.
Good to know: Buy all your paint at once and ask the store to shake it. If you need more than one gallon of the same color, pour them all into a five-gallon bucket and stir. This is called boxing the paint, and it ensures perfectly consistent color across all your walls. Slight color variation between cans is normal and can show as visible stripes on the wall.
Prep the room
Move furniture to the center of the room and cover it with drop cloths or plastic sheeting. Remove outlet covers, light switch plates, and any wall-mounted hardware. Lay drop cloths along the baseboards covering the entire floor area you will be working over. Clean the walls with a damp cloth to remove dust, cobwebs, and surface grime. Paint does not stick well to dirty walls. Fill any nail holes or cracks with lightweight spackle, let it dry for 30 minutes, and sand it smooth with fine-grit sandpaper (220 grit). Wipe away the sanding dust with a damp cloth.
Tape the edges
Apply painter's tape along the ceiling line, baseboards, door frames, and window frames. Press the tape down firmly with your finger or a putty knife, especially along the edge where the tape meets the wall. The mistake to avoid is leaving the edge unsealed, because paint bleeds underneath and dries as a wavy line. Take your time here. Run your finger along the entire length of each tape strip, pressing the edge flat. The tape should overhang the surface you are protecting, not the wall you are painting.
Heads up: Use real painter's tape (blue or green), not standard masking tape. Masking tape does not seal as tightly, leaves adhesive residue, and can peel paint off the surface it is protecting when you remove it. Painter's tape is designed to come off cleanly for up to 14 days.
Prime if necessary
You need primer if you are painting over a dark color with a lighter one, covering new drywall or spackled patches, or dealing with stains or water marks. Use a stain-blocking primer for stains and a standard primer for everything else. Apply primer the same way you will apply paint (cut in edges first, then roll). Let the primer dry completely, usually one to two hours. If you are painting a similar or darker shade over existing paint that is in good condition, you can skip primer entirely. Most modern paints have primer built in for these situations.
Cut in the edges
Dip your angled brush about one-third of the way into the paint. Tap off the excess on the side of the can rather than wiping it across the rim. Paint a two to three inch border along the ceiling line, baseboards, corners, and around any trim or fixtures that the roller cannot reach. Use long, smooth strokes rather than short choppy ones. Work in sections of three to four feet at a time. The goal is to create a clean painted border that the roller will overlap and blend into. Cut in one wall at a time and roll that wall before moving to the next one, so the cut-in edge is still wet when you roll over it.
Roll the walls
Pour paint into the tray and roll your roller through the paint, then roll it back and forth on the tray's ramp to distribute the paint evenly across the roller cover. Start by making a large W or M shape on the wall with the loaded roller. Then fill in the area with even, overlapping vertical strokes. Work in sections about three to four feet wide. Reload the roller when it starts dragging or leaving a stippled texture. Apply light, even pressure. Pressing too hard squeezes the paint out and creates edge lines. Overlap into the cut-in edges while they are still wet so everything blends together.
Apply the second coat
Let the first coat dry for the time specified on the paint can, usually two to four hours. The wall may look patchy or uneven after the first coat, especially with lighter colors. That is normal. Apply the second coat the same way: cut in the edges, then roll. The second coat evens out the color, fills in thin spots, and gives the finished wall its depth and richness. Two coats is standard for almost every paint job. Rarely does a wall look right with just one.
Remove tape and clean up
Remove the painter's tape while the final coat is still slightly tacky, not fully dry. Pull the tape at a 45-degree angle away from the painted surface in a slow, steady motion. If you wait until the paint is completely dry, it can peel along the tape edge. Wash your brushes and roller covers in warm soapy water if you used latex paint. Wrap them in a wet rag if you plan to use them again the next day. Fold up the drop cloths carefully to contain any drips. Replace outlet covers and switch plates after the paint is fully dry.
Your first painted room will take longer than a professional's. That is completely normal. But the result should look just as good if you followed the prep steps and used two coats. The biggest lesson we learned from painting multiple rooms is that patience during prep saves time overall. Every minute spent taping edges and covering floors is a minute you do not spend scraping dried paint off trim or sanding drips later. Wait at least 24 hours before hanging anything on the walls or pushing furniture against them. The paint may feel dry to the touch in a few hours, but it takes a full day to cure enough to resist marks and scuffs.
Questions we get asked about this
Answers from experience, not a textbook.
Measure the total wall area by multiplying the room perimeter (in feet) by the wall height. Subtract 20 square feet for each standard door and 15 square feet for each window. Divide the total by 350, which is the approximate coverage of one gallon. Then double it because you need two coats. A standard 12 by 12 foot room with 8-foot ceilings needs about two gallons. Buy a little extra rather than a little less. Running out mid-wall and having to go back to the store is frustrating and can leave a visible line where wet and dry paint meet.
Most latex paints need two to four hours between coats. The paint can label will specify the recoat time. The surface should feel completely dry to the touch and not tacky at all. Humid conditions and cooler rooms extend drying time. If in doubt, wait longer. Applying a second coat over paint that is not fully dry can cause peeling, bubbling, or a streaky finish. Better to add an hour than redo the whole wall.
No. If you are painting a similar shade over existing paint that is clean and in good shape, modern paint-and-primer-in-one products handle it fine. You need separate primer when covering dark colors with light ones, painting over new drywall or repaired patches, covering stains (use stain-blocking primer), or painting over a glossy surface that needs dulling for the new paint to stick.
Ceiling first if you are painting it, then the walls, then trim and doors last. For the walls themselves, work one wall at a time: cut in the edges, then immediately roll the wall while the cut-in paint is still wet. This ensures a seamless blend between the brushed edges and rolled center. Moving to a different wall while waiting for one to dry breaks the wet edge and can leave visible lines.
For latex (water-based) paint, rinse brushes and rollers under warm running water, working the paint out with your fingers. Use a brush comb or old fork to separate the bristles and remove paint from the base. When the water runs clear, shake out the excess and reshape the bristles. Hang them bristle-down to dry or lay them flat. Never store brushes resting on their bristles. For oil-based paint, you need mineral spirits or paint thinner instead of water. Follow the same process but in a well-ventilated area.
Home Maintenance 101
How to Clean a Microwave
How to Fix a Running Toilet
How to Unclog a Drain
How to Paint a Room
← you’re hereHow to Clean an Oven
How to Hang a Picture
How to Unclog a Toilet
How to Remove a Stripped Screw
How to Remove Rust from Metal