The cost to build a koi pond can vary widely depending on its size, design, materials, and whether you build it yourself or hire a professional. A small, basic DIY pond might cost as little as $1,000 to $3,000, covering essentials like the liner, pump, filter, and a few fish. A mid-sized professionally installed pond with proper filtration, landscaping, and lighting can range from $5,000 to $15,000.
Larger, custom-designed ponds with advanced features such as waterfalls, bottom drains, automatic feeders, or UV filters can exceed $20,000 or more. Long-term costs also need to be considered, including electricity for pumps, water treatments, food, and regular maintenance.
