Interior painting: cost per room, prep, and how to find a painter

For the same 10×12 bedroom, professional quotes commonly span 3× — and the difference is almost always prep, not paint. A $300 quote typically includes minimal patching, no priming, single coat over existing color. A $900 quote covers full prep — cleaning walls, sanding glossy spots, caulking trim/wall joints, patching nail holes and any drywall damage, priming patches and stained spots, two coats of premium paint, taping/protection of floors and trim, and post-job cleanup. The $900 job lasts 8-12 years; the $300 job needs touch-ups in 18 months. When comparing quotes, ask each painter to itemize what's included — most surprises live in the gap between "paint" and "paint properly."

The "right" prep for interior walls: (1) move/cover all furniture and floors (drop cloths, plastic for furniture); (2) remove outlet covers, switch plates, and (where possible) baseboards; (3) clean all walls (sugar soap or degreaser — kitchens and bathrooms always; bedrooms only if visibly soiled); (4) sand any glossy areas to dull (paint won't bond to gloss); (5) patch nail holes, dings, and drywall damage with spackle or joint compound, sand smooth; (6) caulk all wall-trim and corner-bead seams; (7) prime patches, water stains, smoke damage, and ANY color change drop of more than 2 shades; (8) tape edges, masking off ceilings, baseboards, doors, and windows. This 4-6 hours of prep per room is what makes the paint look professional vs DIY.

One coat is enough only when: same color (literally identical, not "similar"), light color over light color, premium paint with high coverage (Behr Marquee, Sherwin-Williams Emerald, Benjamin Moore Aura). Two coats are required for: any color change, light over dark, dark over light, any patched/primed areas, kitchens and bathrooms (durability), any rental or staging-for-sale work. Two-coat jobs run 50-70% more than single-coat. If a contractor quotes one coat and the situation calls for two, you'll see brushstrokes and uneven coverage within 6-12 months as the paint settles. Always ask: "is this priced as one coat or two?"

A gallon of contractor-grade interior paint runs $25-$40; premium paint runs $55-$95. Over 350-400 sq ft (one bedroom) that's a $25-$50 paint cost difference — small relative to the $300-$900 labor. Premium paint covers in fewer coats, levels better, has better stain/scrub resistance, and lasts 2-3× as long. The ONLY reason to use contractor-grade is for a property you'll repaint within 3-5 years anyway (rentals, staging, etc.). For your own home, always ask for premium — the upcharge is small and the lifespan is dramatically better.

Five common sheens, and where each works: (1) Flat / Matte — best for ceilings and adult bedrooms (hides imperfections; least durable); (2) Eggshell — most-popular for living rooms and bedrooms (slight sheen, decent washability); (3) Satin — kids' rooms, hallways, family rooms (more durable, scrubs well); (4) Semi-gloss — bathrooms, kitchens, doors, trim (water-resistant, very washable); (5) Gloss — high-traffic doors and decorative trim (most durable, shows every imperfection). Don't mix sheens within a wall — and don't use flat in any room with kids, pets, or food (cleaning will fail).

Five things commonly drive a quote higher mid-job or post-job: (1) lead-based paint discovery in pre-1978 homes — requires EPA RRP-certified painter and adds $400-$1,500 in containment + disposal; (2) extensive drywall damage hidden behind furniture or wallpaper that wasn't apparent at quote time; (3) ceiling repair needed (water stains, popcorn texture damage); (4) trim, doors, and windows quoted separately from walls (often forgotten in initial estimates); (5) accent walls or color changes mid-room. A reputable painter walks the rooms with you BEFORE quoting, points out potential surprises, and offers an "if-needed" add-on rate so you're not blindsided.