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  1. #1

    How much does it cost to do a 3500 gallon koi pond for a contractor to do the work

    Hi all at last going to get my new pond started my fish have been in a paddling pool for just over a year now because I moved.

    I wondered what people think the cost is to do a high end pond about 3500 gallons half in ground and half out for a contractor to do the work ?

    It is going to be round adds cost.

    I might start a thread build diary



  2. #2
    How long is a pice of string?
    I think it will depend on a few factors like where you live, how accessible your property is, will the the soil have to taken away, insulation, glass, heating, pagoda, drum filter v Nexus and many more.
    You could look up pre fab pond from EZ fiberglass ponds as they sell turn key koi ponds although you would need to prepare a base.

  3. #3
    I know what you mean piece of string.

    Like saying how much does a car cost.

  4. #4
    A lot of variables to consider, but a quality job could be at least £30k

  5. #5
    Member Rank = Nisai stormstorr's Avatar
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    Back in 2021 I constructed a 3000g part raised pond from scratch using a combination of different contractors and my own skills/ time. Took 6 months.

    As others have said - many variables depending on spec - but I worked on the principal of do it once - do it right.

    Concrete base, insulated concrete block sides, externally rendered, infinity window, fibre glassed, 2 aeriated bottom drains, combi drum, extra Hel x media, protein shower, BHM, 3 EA vari pumps, 2 EA Air pumps, auto top up, amalgam uv, Solvent weld piping throughout with ball valves and a Thermotec ASHP.

    Looking at £20k to date, and that was 5 years ago.

    Very happy with the end product.

    Join a local koi club if you can for help and advice.
    2,700 Gallon, Infinity Window, Aquasource Synergy 35 Drum, 12Kw Thermotec Invertor, Amalgum UV.

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  7. #6
    Senior Member Rank = Mature Champion Alburglar's Avatar
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    It also depends how long you want to take. I spent a fraction of that, but it took me years to finish, scrounging everything for free, out of skips or bought cheaply off Facebook/ eBay etc

    For a contractor it's got to be 15k to 30k
    Last edited by Alburglar; 08-04-2026 at 11:42 AM.
    3070 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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  9. #7
    Hi all thanks for your replies.

    I was blown away by the cost I could not believe it mental

    But the build has started I will start a new thread on the build.

  10. Thanks Alburglar, dbs Thanked / Liked this Post
 

 

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