Post Hole Digger: Manual vs Powered — When to Hire

For a handful of post holes in reasonably easy, stone-free soil, a manual post hole digger (or a spade and a bar) is usually perfectly workable. Once you're looking at more than around 8-10 holes, digging in clay, stony or compacted ground, or holes deeper than about 600-900mm for larger fence posts or pergola supports, a powered post hole digger will save you a genuinely significant amount of time and physical effort.

Manual post hole diggers

A manual clamshell-style digger (two long handles with scissor-action jaws) costs relatively little to buy — often well under £50 — and works fine for straightforward jobs. The main limitation is effort and speed: digging a proper post hole by hand, especially in heavy clay or where you hit stones or old rubble, can easily take 20-30 minutes per hole, and it's genuinely hard physical work.

Powered post hole diggers

A powered auger-style digger (petrol or, increasingly, battery) can cut that time to a few minutes per hole in most soil types, and copes far better with compacted or stony ground. They typically come as either a one-person unit or a two-person unit (safer and more controllable in tougher ground, since the auger can kick if it snags on a root or stone).

• Typical hire cost: roughly £40-£70 for a day's hire of a petrol-powered auger, depending on the specification and where you hire from.
• Buying one outright: a decent powered post hole digger typically costs several hundred pounds — rarely worth it unless you're doing regular fencing or landscaping work.

When hiring makes sense

For most homeowners, a powered post hole digger is exactly the kind of tool that's worth hiring rather than buying — you'll likely only need it for a day or two at a time (a fence replacement, a new run of posts for a pergola, or setting posts for a shed base), and hire costs are a fraction of the purchase price. If you're taking on a full fence replacement, factor a day's digger hire into your overall budget alongside the posts, panels and concrete.

What affects how easy the ground is to dig

• Soil type: sandy or loamy soil digs easily; heavy clay is slow and tiring even with power; chalky or very stony ground is the hardest of all.
• Existing services: always check for buried cables, pipes or drains before digging — a cable/pipe locator or checking utility plans is worth doing first, especially near a house or existing driveway.
• Depth needed: a rule of thumb for fence posts is roughly a third of the post's overall length below ground, so a taller fence or freestanding structure needs deeper, more demanding holes.

Common mistakes

• Not checking for buried services first. Striking a cable or pipe is a genuine safety risk and can be expensive to repair.
• Digging holes too shallow. A post that isn't set deep enough (or without enough concrete around its base) can lean or work loose within a year or two.
• Choosing a one-person auger for tough, stony ground. A two-person unit gives far more control if the auger catches on something solid.

Technique for a cleaner hole

Whichever type of digger you use, a few basics make a real difference: start the hole slightly wider than the post itself to leave room for concrete or hardcore backfill, work in short bursts rather than forcing the auger continuously (this reduces the chance of snagging or overheating), and remove loosened soil regularly rather than letting it build up and clog the hole. If you hit a large stone or root that the digger can't clear, it's usually quicker to break it out with a bar than to keep fighting it with the auger.

Petrol-powered augers need the same basic care as any other petrol garden equipment — see our guide to servicing petrol garden equipment if you do end up buying one for regular use rather than hiring.

Battery-powered post hole diggers

Battery-powered augers are becoming more widely available and offer the usual battery-tool benefits — no fuel mixing, quieter operation, instant start — though runtime per charge is more limited than petrol, which matters if you have a lot of holes to dig in one session. For most one-off domestic jobs (a run of fence posts, a few pergola footings), a battery-powered auger is often perfectly adequate; for a larger job like a full plot boundary fence, petrol's unrestricted runtime has the edge.