Painting, done well.

Interior painting typically costs $2-6 per square foot of wall space, or $400-800 per average room. Exterior painting runs $2-4 per square foot of home size. Full house repaints range $4,000-$12,000 depending on size, condition, and prep work needed.

Interior walls: 5-10 years depending on traffic and wear. Interior trim: 7-10 years. Exterior: 5-10 years depending on climate and paint quality. High-traffic areas like hallways and kids' rooms need more frequent touchups.

DIY works for small, straightforward projects if you have time and don't mind prep work. Hire professionals for whole-house jobs, high ceilings, stairwells, exterior work, older homes (lead paint risk), or when time matters. Quality prep separates pros from amateurs.

For high-traffic areas and kitchens/bathrooms, invest in premium washable paint ($50-80/gallon) for durability. For guest rooms and closets, mid-grade paint ($35-50) is fine. Never use cheap paint for exteriors — premium exterior paint lasts twice as long.