Interior vs. Exterior Paint: Why the Cost Differs So Much

These aren't just the same job, indoors or out. Here's what actually drives the cost difference.

Exterior paint needs to withstand weather

Exterior-grade paint is formulated to handle UV exposure, moisture, and temperature swings — this durability requirement affects both product cost and application requirements.

Exterior prep is often more extensive

Power washing, scraping old paint, and repairing siding or trim damage add real time and cost that interior projects rarely require to the same degree.

Height and access add labor cost outdoors

Ladders, scaffolding, and working at height for a two-story exterior meaningfully increase labor cost and time compared to interior work.

Interior projects are more predictable

Interior painting has fewer weather-dependent variables and generally simpler access, making cost easier to estimate accurately upfront.

Combining both can offer efficiency

If you're doing both interior and exterior around the same time, some contractors offer better overall pricing for bundling the work versus hiring separately.