1/2/24, 5:45 PM

HOW DEEP SHOULD A FENCE POST HOLE BE?

HOW DEEP SHOULD A FENCE POST HOLE BE?

One of the common questions we get asked is 'how deep should I install a fence post into the ground?'. There is no one-size-fits-all answer to this question, as it will depend on ground conditions and the height of the fence.

Our standard recommended depth of a fence post hole is 24 inches (600mm).

To begin, we suggest digging the post hole so it is approximately three times wider than the fence post. For example, if you have a 3-inch wide post that you need to sit over 6 feet (1.83m) in height above the ground, we recommend the hole size should be: 9 inches wide x 24 inches depth. This rule of thumb can be followed for all size posts (e.g., a 6-foot-high fence would require a hole depth of at least 24 inches or 2 feet). We do not recommend every post hole to be the same, no matter the height of the fence post.

WHAT SIZE POSTS DO I NEED FOR MY FENCE?

As mentioned earlier, our standard recommended depth for a fence post hole is 24 inches. Therefore, when calculating the length of a post, you should add at least 24 inches to the desired height of the fence.

FENCE POST HOLE SAFETY FIRST
We strongly recommend before you start digging your fence post hole that you either check for any mains electrics or contact your utility company to mark any underground cables or hazards. Doing this also allows for you to reassess the fence line, layout and any positioning issues to make sure everything is exactly where you require it.

TIMBER OR CONCRETE POSTS

If using timber posts it is important to note that they must be set in either concrete or Post Fixing Mix on top of a minimum of 2-inch ballast/gravel. This is to allow drainage to take place between the post and the concrete. For the best results, we recommend using rapid drying Post Fixing Mix. Always try to angle Post Fixing Mix slightly so it can shed water away.

For additional advice about the positives and negatives for both concrete and wooden fence posts, giving you a fair evaluation of each type, see our blog covering the topic.

TOOLS REQUIRED

- Rabbit hole digger
- Hand shovel
- Hammer
- Garden stakes
- Measuring tape
- Level
- Concrete / Post Fixing Mix

TOP TIP

If you are planning on doing DIY, we highly recommend a post hole digger or a rabbit hole digger, which is essentially a single shovel that has been designed to dig circular holes. The unique design enables the user to dig straight down to the ideal depth and keep the hole relatively narrow in diameter compared to a conventional shovel.

Why not use a local T & M Fence Pros to undertake the job for you?

Please note: we would not recommend installing fence posts without the use of Post Fixing Mix.