The first thing you'll need to consider is what size and shape trampoline you want.
What works best in the space you have? Round, square or even oval. Do you have an existing trampoline you want digging in?
If you have an existing trampoline you want digging in then you will need to use a retaining wall to stop the earth falling in under the trampoline.
Using a traditional trampoline and full-height retaining wall will mean you'll have to excavate a lot of soil and the cost of the retaining wall is expensive.
A better option is to purchase a purpose-built in-ground trampoline such as the Capital In-ground Trampoline Kit.
The design of this solution means less soil disposal and the cost of the trampoline and retaining wall is also reduced.
Digging the hole
Firstly you'll need to determine the size and depth of the hole you want to dig. If you're using a full height wall and say a 12ft round trampoline, you need to dig a 14ft circumference hole to a depth of about 3ft. Once the trampoline and wall are in place, you then fill in on the outside and inside of the wall.
You have the option to either hand-dig the hole or use a mini-digger. On a smaller trampoline say a 10ft, provided your soil is not too hard, then it's fairly straightforward to dig by hand. It will take two people a full day and make a great work-out!
If however you have a larger hole to dig, say 14ft, then a mini-digger will greatly assist digging out most of the soil, whilst you can finish by hand.
Whether hand-digging or using a mini-digger you will still have the issue of soil disposal. You will need to hire a skip or better still use a grab lorry to remove the soil.
To save money, you could consider creating a feature in your garden with the excess soil - this could be a bank (for kids to play on) or raised flower-beds.
What about drainage?
Whether you need drainage will depend of the type of soil you have. If you have sandy soil, you probably won't require any further drainage. If however you have non-porous soil which has a high clay content, then it's wise to at least put in a soak-away or similar at the bottom of the hole.
In more extreme cases a drainage channel may have to be dug out to a lower lying area in your garden.
Putting a cover on the trampoline will also help prevent excess water getting into your hole.
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