How Much Does It Cost To Install And Maintain A Koi Pond?

If you are looking to add some beauty and tranquility to your backyard, a koi pond may be the perfect solution. But before you get too excited, it's important to understand the cost of installing and maintaining one of these ponds.

The most popular type of koi pond is the in-ground variety. These ponds can be installed using a preformed liner or by digging a hole and lining it with rubber or PVC. According to Expert Aquarist, the average cost of installing and maintaining a koi pond ranges from $ 5,000 to $30,000, depending on the size. For example, the smaller 4x6 feet option would cost around $5,000, while a medium-sized 6x8 feet pond would cost around $14,000. The largest size at 8x11 feet would cost the most at just over $28,000. The cost of installing an in-ground koi pond will also depend on the size of the pond and the type of material you use for the liner.

In this article, we will break down the costs involved in both stages so that you can make an informed decision.

Factors for cost

There are several costs associated with installing and maintaining a koi pond, including location, size, pond liners, pumps, filtering, and UV sterilizing.


The cost to install a koi pond will largely depend on its location. Flat, low-lying locations work best, but the cost differs from city to city. According to Angi, the average cost to build a pond in Chicago is $2,300 compared to $3,600 in Boston.


The size of your koi pond will be the biggest factor in the overall cost. According to Expert Aquarist, the average koi pond ranges from $5,000 to $30,000.


What's a koi fish pond without koi? Prices depend on their size and quality. It's important to also factor in the size of your planned garden and the number of fish you plan to have. According to Pond Academy, prices range between $5 to $10, depending on size.

Pond Liner

The type of liner you choose for your koi pond will also affect the cost. According to Modest Fish, the best material for a pond liner is high-density polyethylene (HDPE). Pond liners average between $1,200 and $4,000.


You will need a pump to circulate the water in your koi pond and keep it oxygenated. The average cost of a pond pump is between $250 and $2,000.


A koi pond will need to be filtered to remove debris and keep the water clean. The average cost of a pond filter is between $550 and $3,500.

UV Sterilizer

A UV sterilizer is used to kill algae and bacteria in the water. The average cost of a UV sterilizer is between $180 and $3,500.

Additional costs

In addition to the costs listed above, there are also other costs associated with owning a koi pond. These include the cost of landscaping, lighting, heating, and excavation. Consider these additional costs when deciding if a koi pond is right for you.


The cost of landscaping will depend on the size and complexity of your koi pond. According to Expert Aquarist, the average cost is between $800 and $5,500.


According to Funky Koi, lights around your pond can help guests safely navigate around your pond while keeping unwanted predators away from your fish. Adding lighting to your koi pond will add to the overall cost. The average cost of lighting is between $350 and $1,500.


If you live in a colder climate, you may need to heat your koi pond to keep the water at a comfortable temperature. The average cost of heating a koi pond is between $550 and $2,500.


If you are having an in-ground koi pond installed, the cost of excavation will be added to the overall cost. The average cost of excavation is between $400 and $1,500.

Types of ponds

It's important to know the different types of backyard ponds before you make a decision. The three most common types of backyard ponds are fish ponds, garden ponds, and farm ponds.

Koi Fish Ponds

Koi fish ponds are the most popular type of backyard pond. They are usually in-ground and can range in size from small (4x6 feet) to large (8x11 feet). According to Expert Aquarist, The average cost of a koi fish pond is between $5,000 and $30,000 depending on the size, equipment needed, and amount of fish.

Fishing Ponds

Fishing ponds are the most common type of backyard pond. They are typically stocked with bass, catfish, and other types of fish. The average cost for a fishing pond ranges between $11,600 to $34,700 depending on size, number of fish, and maintenance.

Garden Ponds

Garden ponds are smaller than fish ponds and do not typically contain fish. They are usually stocked with plants, amphibians, and invertebrates. The average cost of a garden pond is between $3,200 and $26,000.

Farm Ponds

Farm ponds are larger than garden ponds and are usually used for irrigation, livestock watering, or as a swimming hole. The average cost of a farm pond is between $4,000 and $9,500.

Why you need a koi pond

There are several reasons why you might need a new koi fish pond. These reasons could include damage to your current pond, moving to a new home, or wanting to upgrade an existing pond.

Damage to Current Pond

Damage to your pond can come in many forms, including leaks, cracks, and holes, and sometimes the damage is irreversible. If your pond has been damaged by a storm, flooding, or another event, you will need to replace it. The cost to replace your pond will depend on the size and type of pond you choose.

Moving to New Home

According to Census, the average American moves at least nine times between the ages of 18 and 45. If you are moving to a new home, you may need to install a new pond. Take into consideration the size of your new yard, the climate, and your budget when choosing a pond.

Upgrading an Existing Pond

If you want to change the size, shape, or depth of your pond, you will need to replace it. When adding fish, don't forget to account for the additional food and filtration they will need.

Benefits of a koi pond

There are many benefits to owning a koi fish pond. These benefits include an increased home value, a natural habitat for fish, and a relaxing atmosphere.

Visual Appeal

One of the most obvious benefits of a koi fish pond is the visual appeal it adds to your home. A well-designed and -maintained pond can increase the curb appeal of your home. Putting in the work to maintain a koi fish pond can transform a boring yard into a beautiful oasis.

Natural Habitat for Fish

A koi fish pond can provide a natural habitat for fish. In the wild, koi live in streams and ponds with plenty of vegetation. They use the vegetation to hide from predators and to spawn. In a koi fish pond, the fish will have plenty of places to hide and spawn.

Relaxing Atmosphere

Another benefit of a koi fish pond is the relaxing atmosphere it can provide. According to a study published in the National Library of Medicine, Sitting by a pond and watching the fish swim can be very calming. The sound of the water can also be soothing.