Exterior Paint for a 20×30 House
A 20×30 house with 9 ft walls has about 900 sq ft of wall — roughly 6 gallons for two coats. Subtract big windows below for a tighter number.
Paint to buy
6 gal
Wall area
900 sq ft20×30 footprint, 9 ft walls (gross)
Paint (2 coats)
6.0 gallonsbuy 6 gal
Coverage
300 sq ft / gallonper coat, exterior surface
Paint cost (est.)
$270~$45/gal exterior
Doing this for work? Estimate the whole job in minutes.
JRIQ turns plans and site photos into full material + labor estimates with AI — built by the team behind these calculators.
Try it free →
Want the full guide — tools, step-by-step, common mistakes and FAQ? See the Exterior Paint Calculator.