There are several other types of pool finishes to choose from apart from tile. Plaster and aggregate are the other two common types of pool finishes. Plaster finish: It costs $3.60–$4 per sq. ft. to install. They’re affordable but have a short life span and require a lot of maintenance. Pool maintenance costs around $110–$350 per year. Aggregate: It costs about $4.75–$5 per sq. ft. They’re low maintenance, have excellent longevity, and are more visually appealing. But they’re more expensive and prone to calcium buildup.