Interior Painting

Interior painting is one of the most impactful and cost-effective home improvement projects. A fresh coat of paint transforms a room's appearance, protects surfaces, and can increase property value. This guide covers the complete process from planning through completion.

Planning Your Interior Paint Job

Choosing Paint Type

Paint Type	Dry Time	Cleanup	Odor	Best For
Latex/Acrylic	1-2 hours	Soap and water	Low	Walls, ceilings, most interior surfaces
Oil/Alkyd	6-8 hours	Mineral spirits	High	Trim, cabinets, high-wear surfaces
Hybrid Alkyd	4-6 hours	Soap and water	Low-Medium	Trim, cabinets, doors

Choosing Finish/Sheen

Room	Recommended Finish	Why
Ceilings	Flat/Matte	Hides imperfections, no glare
Living rooms, bedrooms	Eggshell	Subtle sheen, reasonably washable
Kitchens, bathrooms	Satin	Moisture-resistant, very washable
Hallways, kids' rooms	Satin	Durable, handles heavy cleaning
Trim, baseboards, doors	Semi-gloss	Maximum durability, easy to clean
Accent details	High-gloss	Dramatic shine, ultra-durable

Estimating Paint Quantity

One gallon of paint covers approximately 350-400 square feet per coat. For a standard room:

1. Measure the perimeter (sum of all wall lengths)
2. Multiply by ceiling height
3. Subtract windows (~15 sq ft each) and doors (~21 sq ft each)
4. Divide by 350 for gallons per coat
5. Multiply by number of coats (usually 2)
6. Add 10% for waste and touch-ups

The Painting Order

Professional painters follow a specific sequence for the best results:

Step	Area	Reason
1	Ceiling	Drips and splatter fall on unpainted walls
2	Walls — cut in	Edges done while focus is fresh
3	Walls — roll	Fill in cut-in borders with roller
4	Trim and baseboards	Cover any wall paint that got on trim
5	Doors	Painted last to avoid touching
6	Touch-ups	Final inspection and corrections

Room Preparation

Proper prep is 80% of a successful paint job — see Surface Preparation for detailed guidance.

Protecting the Space

• Move furniture to center of room; cover with plastic sheeting
• Lay canvas drop cloths on floors (canvas absorbs drips; plastic is slippery)
• Remove switch plates, outlet covers, and light fixtures
• Remove curtain rods and wall decorations
• Apply painter's tape to ceiling edges, trim, and windows

Repairing Surfaces

• Fill nail holes and small cracks with lightweight spackle
• Patch larger holes with drywall repair kits
• Sand all repairs smooth with 150-grit sandpaper
• Caulk gaps between trim and walls with paintable caulk
• Wipe all surfaces with a damp cloth to remove dust

Priming

Apply primer when:

• Covering new or repaired drywall
• Making a dramatic color change (use tinted primer)
• Covering stains (use shellac-based stain-blocking primer)
• Surface was previously glossy (use bonding primer)

Painting the Ceiling

1. Use flat/matte white ceiling paint (hides imperfections and roller marks)
2. Cut in around the perimeter with a 2.5" angled brush
3. Roll with a 3/8" nap roller on an extension pole
4. Work in one direction, maintaining a wet edge
5. Apply two coats for full coverage
6. Let dry completely before painting walls

Painting Walls

1. Box your paint — pour multiple cans into a 5-gallon bucket for consistent color
2. Cut in all edges: ceiling line, corners, around trim, outlets
3. Roll walls using W-pattern in 3-4 foot sections
4. Maintain a wet edge — always roll into wet paint
5. Apply light, even pressure; let the roller do the work
6. Allow first coat to dry (2-4 hours for latex)
7. Apply second coat following the same process

Room-by-Room Guide

Bathrooms

• Use mold and mildew resistant paint formulas
• Choose satin or semi-gloss finish for moisture resistance
• Ensure good ventilation (exhaust fan running during and after painting)
• Clean walls with mildew remover before painting
• Use moisture-resistant primer on bare surfaces

Kitchens

• Degrease walls thoroughly with TSP before painting
• Use satin finish for washability
• Consider semi-gloss behind stove and sink areas
• Cabinet painting is a separate, more involved process
• Allow extra ventilation during painting

Bedrooms

• Eggshell finish is the standard choice
• Consider color psychology — blues and greens promote calm
• Accent walls add drama without overwhelming
• Low-VOC or zero-VOC paint recommended for better sleep and air quality

Living and Dining Rooms

• Eggshell finish for elegant, subtle sheen
• Consider the room's lighting when choosing colors — see How to Choose Paint Colors
• Test paint samples on the actual walls in your lighting
• Coordinate with existing furniture and flooring

Hallways and Stairways

• Use satin finish — hallways get more touching and scuffing
• Lighter colors make narrow hallways feel more spacious
• Consider durability — hallways are high-traffic areas
• Stair areas may require scaffolding or ladder platforms

Ventilation and Safety

• Open windows and use fans for air circulation
• Even low-VOC paints benefit from ventilation during application
• Wear safety glasses when painting overhead (ceilings)
• Use a respirator with organic vapor cartridges for oil-based products
• See Painting Safety for comprehensive safety guidelines

Cleanup

• Latex paint: Clean brushes and rollers immediately with warm soapy water
• Oil paint: Clean with mineral spirits in well-ventilated area
• Remove tape while paint is slightly tacky, pulling at 45° angle
• Seal leftover paint cans tightly — place plastic wrap over can before lid
• Store paint in cool, dry place (not freezing)
• Dispose of paint properly — see Paint Disposal

Common Interior Painting Mistakes

• Skipping prep — the #1 cause of poor results
• Cheap paint — premium paint covers better, lasts longer, and looks better
• Not enough coats — two coats is the standard minimum
• Cutting corners on primer — leads to uneven coverage and stain bleed-through
• Painting in wrong conditions — too cold, too hot, or too humid
• Overloading rollers — creates drips and orange-peel texture
• Not maintaining wet edge — creates visible lap marks

Frequently Asked Questions

How long does it take to paint a room?

A typical 12x12 bedroom takes 4-8 hours for an experienced DIYer including prep, two coats, and cleanup. Plan for a full day if you include drying time between coats. A professional crew can complete the same room in 2-3 hours. Larger rooms, high ceilings, extensive prep work, and multiple colors add time. Budget extra time for kitchens and bathrooms which require more cleaning and careful work around fixtures.

Should I paint the ceiling the same color as the walls?

White ceilings are the most common choice because they reflect light, make rooms feel taller, and create a clean, classic look. However, painting ceilings the same color as walls creates a cocooning, dramatic effect that works well in bedrooms and small rooms. A ceiling painted one shade lighter than the walls is a sophisticated compromise. Dark ceiling colors can create intimacy but make rooms feel smaller — best reserved for rooms with high ceilings.

Do I need to prime before painting interior walls?

You need primer when covering new drywall (PVA primer), making a dramatic color change (tinted primer), covering stains (shellac-based primer), or painting over glossy surfaces (bonding primer). If you're repainting a wall the same or similar color and the existing paint is in good condition, you can usually skip primer and go directly to two coats of quality paint. Many premium paints now include built-in primer for routine repaints.

What is the best paint for interior walls?

100% acrylic latex paint is the best choice for most interior walls — it offers low odor, easy water cleanup, fast drying, excellent color retention, and good washability. Premium brands like Benjamin Moore Regal Select, Sherwin-Williams Emerald, and Behr Marquee offer the best coverage and durability. For trim and cabinets, consider hybrid alkyd formulas for a smoother, harder finish with the convenience of water cleanup.