Excavation Batter or Stepping: When Do You Need Which?

An excavation batter means cutting the sides of a trench or hole back at a safe angle so the soil can't collapse inwards. You batter back (or step) an excavation when the ground can't safely stand vertical on its own — which, for most domestic and light commercial digs, is nearly always. If you can't batter or step because of space, you shore or box instead. The rule of thumb: never assume a trench wall will hold just because it looks solid.

This post covers one decision: whether to batter back, step or support the sides of an excavation. For the full process, including underground services, permits to dig, edge protection and inspections, see our excavation safety guide.

This post covers Great Britain, where the Construction (Design and Management) Regulations 2015 (CDM 2015) apply. Northern Ireland has its own CDM 2016 regulations.

Unsupported trenches kill people. A worker in Surrey was crushed under roughly two tonnes of soil in 2020 when an unsupported trench collapsed while he was replacing a pipe at the bottom of a deep excavation dug with a three-tonne digger. There were no supports and the spoil had been piled right next to the edge. Three parties were later sentenced, with fines totalling over a million pounds and a suspended prison sentence for a contracts manager who'd seen a worker in the same unsupported hole earlier that day.

What does batter back mean and how is it different from stepping?

Both are ways of stopping trench walls from collapsing without shoring or trench boxes.

Battering means cutting the excavation sides back to a slope. Instead of vertical walls, you dig the sides at an angle so the soil rests naturally and won't slide in. The looser or wetter the ground, the shallower (flatter) the angle needs to be.

Stepping means cutting the sides in a series of horizontal steps or benches rather than one continuous slope. Each step reduces the effective height of any single vertical face. Stepping is often used in deeper digs or where you need working space at the bottom but want a benched profile above.

The choice usually comes down to space and depth. If you've got the room, it's simple and effective. If you haven't, you step it, or you shore it.

When should you batter back rather than shore?

Batter back when you have the surface space and the ground conditions suit it. This is common on:

• Open sites with room to spare, like a rear garden or a field-edge foul drain run
• Foundation digs for extensions where the plot allows a wider excavation
• Soakaway pits and inspection chamber excavations in open ground
• Any dig where bringing in trench boxes isn't practical for the size of job

Battering is often the cheapest and quickest option for a sole trader if the ground allows. A groundworker digging a shallow drainage trench in stable clay across an open garden can batter the sides and avoid hiring shoring gear.

But battering has limits. In loose, sandy, made-up or waterlogged ground, the safe angle can be so shallow that battering becomes impractical — you'd be moving far more spoil than the job warrants. In those conditions you shore or box instead. And remember, a batter that looked fine in dry weather can fail after heavy rain, because water changes how the soil behaves.

Want a list to take to your competent person? Answer six questions in our free batter, step or support selector and print the record.

When should you step the excavation instead?

Step the excavation when it's deep enough that a single continuous batter would be enormous, or where you want a stable profile with working access at different levels.

Typical situations:

• Deeper foundation or basement digs where a full-height batter isn't feasible
• Excavations against a boundary where you can angle back on the free side and step where space runs out
• Ground that's stable enough to stand at reduced heights but not as one tall face

Stepping can also be combined with support. You might step the upper part of a deep dig and box the lower working area.

The key point is that stepping reduces the height of each exposed face. But stepping still relies on the ground standing at each step, so it isn't automatically safer than shoring — it depends entirely on the soil.

What affects the safe angle for an excavation batter?

There's no single safe angle that works everywhere. It depends on:

• Soil type — clay, sand, gravel, chalk and made ground all behave differently. Loose or granular soils need much flatter batters than firm clay.
• Water — rain, groundwater or a leaking service can turn a stable face into a slumping mess. Wet soil is heavier and weaker.
• Surcharge — anything loading the ground near the edge. This includes spoil heaps, stacked materials, plant and vehicles. In the Surrey case, excavated soil had been dumped immediately next to the trench, adding weight right where it could trigger a collapse.
• Vibration — nearby traffic, plant or piling can shake soil loose.
• Time — a face left open for days weathers and weakens.

Always keep spoil and plant well back from the edge. If in any doubt about ground conditions or depth, get advice from someone competent — a temporary works designer or an experienced groundworker — rather than guessing. Our excavation safety guide covers shoring, underground services and inspections.

What the law says

Regulation 22 of CDM 2015 covers excavations. It says all practicable steps must be taken to prevent danger, "including, where necessary, the provision of supports or battering". The aim is that the excavation does not collapse, no material falls in, and nobody is buried or trapped.

Regulation 22 also says you must:

• stop people, equipment and piles of material falling into the excavation;
• where necessary, stop the excavation or the ground next to it being overloaded by equipment or material; and
• where supports or battering are used, keep people from working in the excavation until a competent person has inspected it and is satisfied the work can be done safely. They inspect at the start of each shift, after anything likely to affect its strength or stability, and after any material falls or is dislodged by accident. Anything they are not happy with must be put right before work carries on.

Regulation 24 covers the inspection report. If the inspector is not satisfied the work can be done safely, they must tell the person they inspected for before the end of the shift, and give that person a written report within 24 hours. That person keeps the report on site until the work is finished, then keeps it for three months.

The law does not choose the method for you. Whether you batter, step or support the sides, the profile has to stop a collapse in the actual ground, and a competent person decides it.

How to record your excavation decisions in your RAMS

Whatever method you choose — batter, step, box or shore — write it down before anyone gets in the hole. Your method statement should say how the sides will be made safe, how spoil and plant will be kept back from the edge, and who inspects the excavation and when.

A good risk assessment for excavation work should cover:

1. The ground conditions expected and how they'll be checked
2. The support method chosen and why
3. Where spoil and plant will be placed relative to the edge
4. Safe access and egress from the excavation
5. Buried and overhead services
6. Inspection arrangements before each shift and after events like heavy rain

You can build this quickly with a free RAMS generator for groundworks and excavation, which lets you set out your batter or stepping approach in plain language rather than starting from a blank page. If you're producing these regularly across different jobs, the full RAMS features for construction trades help you reuse and adapt method statements without rewriting everything each time.

For notifiable or larger jobs where you're the principal contractor, your excavation controls also feed into the site's construction phase plan, so the whole team knows the method before digging starts. Sole traders juggling several small jobs a month often find a straightforward pricing plan works out cheaper than the time lost writing documents by hand.

The bottom line

Batter back when you've got surface space and suitable ground. Step when the dig is deep or space is tight on one side. Shore or box when you can't do either safely. Never leave a trench wall unsupported on the assumption it'll hold, never pile spoil next to the edge, and never send someone into an excavation you haven't made safe first. A collapse gives no warning — two tonnes of soil is enough to kill.

This article is general guidance, not legal advice or a guarantee of compliance. Ground conditions vary, so assess every excavation on its own merits.

Sources

Official pages this guide draws on; check them for the current wording:

• <https://press.hse.gov.uk/2026/09/09/two-companies-and-an-individual-sentenced-after-worker-crushed-by-two-tonnes-of-soil-in-trench-collapse>
• CDM 2015, regulation 22 (Excavations)
• CDM 2015, regulation 24 (Reports of inspections)
• HSE, Excavations