Drainage Solution Costs (Rough Estimates):

Splash block: $10–$30 - Downspout extension (flexible): $10–$25 - Underground downspout line, 20 feet: $100–$300 DIY, $300–$700 installed - Surface regrading (small area): $200–$800 DIY equipment rental, $500–$2,000 contractor - Simple interceptor French drain, 50 feet: $400–$800 DIY, $1,500–$3,500