Interior House Painting: A Complete Guide

Start by planning room by room

The best interior house painting projects start with a plan, not a paintbrush. Walk through each room and decide what you actually want to change. A bedroom might just need a refresh on the walls, while a kitchen or bathroom may call for a tougher finish that stands up to moisture and scrubbing. Writing this down keeps you from buying the wrong product or running out halfway through.

Think about how each room is used and how much light it gets. North facing rooms in Colorado can feel cool and gray, so warmer tones help. South and west facing rooms get strong, high altitude sun that can wash out soft colors and fade them faster over time. Order your rooms so you finish the spaces you live in most first, and save closets, hallways, and guest rooms for last.

If you are repainting the whole house, group rooms by color and sheen so you can buy paint in larger quantities and reduce the number of times you switch products. This is also a good moment to decide whether you are tackling this yourself or bringing in help, which we cover at the end.

Common Colorado painting projects and timelines

Here is a quick look at the painting projects we handle most and what to expect from each.

Choose colors and the right sheen for each room

Color gets all the attention, but sheen is what determines how a finish wears and how it looks under Colorado's bright light. Sheen is the amount of shine in the dried paint, and each level has a job. Always test color samples on the actual wall and look at them in morning, midday, and evening light before you commit, because high altitude sun shifts how colors read throughout the day.

Here is a simple way to match sheen to room:

• Flat or matte: ceilings and low traffic adult bedrooms. It hides surface flaws well but is hard to clean.
• Eggshell: living rooms, dining rooms, and most bedrooms. A soft, low glow finish that wipes down better than flat.
• Satin: hallways, kids rooms, and family spaces that see fingerprints and scuffs. Durable and easy to clean.
• Semi gloss: kitchens, bathrooms, trim, doors, and laundry rooms. Resists moisture and scrubs clean.
• Gloss: rarely used on walls, but excellent for cabinets and high wear trim where you want a hard, washable surface.

Figure out how much paint you need

Buying the right amount of paint saves money and prevents the headache of a second store run with a color that does not quite match a new batch. The rule of thumb is that one gallon covers about 350 to 400 square feet with one coat. Most interior jobs need two coats, so plan accordingly.

To estimate, measure the length of each wall, add those numbers together, and multiply by the ceiling height to get total wall square footage. Subtract roughly 20 square feet for each standard door and 15 for each window. Divide the result by 350, then double it for two coats. For an average 12 by 12 foot bedroom with eight foot ceilings, that works out to roughly two gallons for the walls.

Buy a little extra and keep the leftover for touch ups. Dark colors, deep reds, and bright accent walls often need three coats to look even, so add a gallon when you go bold. Do not forget separate product for ceilings and trim, since those usually call for a different sheen.

Prep the surfaces properly

Prep is the part everyone wants to skip, and it is the part that separates a job that lasts from one that peels and shows every flaw. Plan to spend nearly as much time prepping as painting. Start by clearing the room, covering floors with drop cloths, and removing outlet covers and switch plates.

Wash the walls to remove dust, grease, and cooking residue, especially in kitchens. Fill nail holes and small dents with lightweight spackle, let it dry, then sand smooth. For larger cracks or drywall damage, use joint compound and feather the edges. Sand any glossy areas lightly so the new paint has something to grip.

Priming matters more than people think. Prime any bare drywall, patched spots, stains, and surfaces where you are making a big color change. A stain blocking primer stops water marks and old smoke from bleeding through. Skipping primer on fresh patches leads to a dull, blotchy look called flashing, where the repaired spots show through the finish coat.

• Patch holes and cracks, then sand flush
• Sand glossy or rough areas for adhesion
• Caulk gaps where trim meets walls
• Spot prime patches, stains, and bare drywall
• Tape off trim, windows, and edges you want to protect

Follow the right order of operations

Painting in the correct sequence keeps drips and overspray from ruining finished surfaces. The order is always ceilings first, then walls, then trim and doors last. Working top to bottom means any splatter lands on a surface you have not finished yet.

Start with the ceiling so you do not worry about marking up freshly painted walls. Next do the walls, cutting in the edges with a brush along the ceiling line and corners, then rolling the open areas while the cut in paint is still wet so it blends. Save trim, baseboards, window casings, and doors for last, since their semi gloss finish shows brush marks and benefits from your full attention.

Between coats, give the paint the time it needs to dry before recoating. Rushing the second coat pulls at the first and leaves streaks. Most interior latex paints want at least two to four hours between coats, though Colorado's conditions can change that, as we explain next.

Mind low VOC paint and indoor air

Because interior painting happens in closed rooms where you breathe the air, the type of paint you choose affects your comfort and health. VOCs, or volatile organic compounds, are the chemicals that create that strong paint smell and can irritate eyes, throat, and lungs as the paint cures.

Look for paint labeled low VOC or zero VOC. Nearly every major brand now offers these lines, and they perform just as well as older formulas while giving off far less odor. They are especially worth it for bedrooms, nurseries, and any home with kids, pets, or anyone sensitive to smells.

Even with low odor paint, ventilate well. Open windows, run a fan to move air toward the outside, and keep the space aired out during and after painting. In Colorado's dry climate, paint odor tends to clear faster than in humid regions, but good airflow still makes the work more pleasant and helps the finish cure cleanly.

Handle drywall and trim the right way

Drywall and trim each need their own approach. New or repaired drywall is porous and soaks up paint unevenly, so it must be primed first with a drywall primer or a self priming wall paint applied as a dedicated first coat. Roll drywall in even, overlapping passes and avoid going back over areas that have started to set, which leaves roller marks.

Trim, baseboards, doors, and window casings are usually painted in semi gloss or satin for durability. Caulk the seam where trim meets the wall before painting for a crisp, finished line. Sand glossy old trim so the new coat sticks, and use a quality angled brush for clean edges. Many homeowners paint trim a bright white or a soft off white to frame wall colors, and these high sheen finishes reward patient, thin coats over thick ones.

If you are also thinking about the outside of your home, the prep and product choices differ a good deal. See our guide to exterior house painting for how those surfaces and conditions change the approach.

Account for Colorado's dry air, then judge DIY versus hiring out

Colorado's high altitude and low humidity change how paint behaves. Dry air makes paint set up fast, which sounds helpful but can work against you. The surface skins over quickly, leaving less time to blend brush and roller strokes before they show. Keep a wet edge, work in smaller sections, and do not let cut in areas dry before you roll up to them.

Fast drying also tempts you to recoat too soon. The surface may feel dry while the layer underneath is still soft, so follow the recommended recoat times even when the paint seems ready early. In summer, strong sun through windows can dry one wall faster than another, so consider closing blinds while you work. A single average room is usually a one to two day project for a homeowner, while a full interior can stretch across one to two weeks of evenings and weekends.

Interior painting is one of the most DIY friendly home projects, especially bedrooms, living rooms, and simple square spaces. It is worth hiring a professional when you have tall stairwell walls, extensive drywall repair, heavy trim and cabinet work, or simply want it done quickly and flawlessly. To weigh the numbers, see our house painting cost breakdown and our overview of house painting in Colorado guide. When you decide to bring someone in, our tips on how to choose a painter will help you find a crew you can trust.