How to Install Steel Lawn Edging: A Step-by-Step UK Guide

To install steel lawn edging: mark your line, cut a narrow slot along it with a spade, slide the steel edging into the slot, drive it down to your desired height with a rubber mallet, overlap each section, and firm the soil back on both sides. A typical 2.4m run takes around 10–15 minutes. Below is the full step-by-step method, including how to bend the steel around curves and the mistakes to avoid.

Why choose steel lawn edging?

Steel edging gives you the crispest, longest-lasting border you can buy. Unlike plastic (which becomes brittle and lifts) or timber (which rots), 3mm steel garden edging holds a clean line for years and all but disappears into the lawn, letting the planting do the talking. Edensteel edging is made in Britain from 3mm steel and is flexible enough to follow gentle curves while staying rigid once installed.

Tools and materials you'll need

• Steel lawn edging strips (measure your border length first — see sizing below)
• A sharp spade or edging iron
• A rubber mallet or a timber offcut + lump hammer (to protect the steel's top edge)
• A string line and pegs for straight runs
• A garden hose or rope for marking curves
• Heavy-duty gloves (cut steel edges can be sharp)
• A spirit level (optional, for a consistent reveal height)

How much edging do you need?

Measure the total length of every border you want to edge, then divide by the length of the strips. Edensteel strips are 2400mm (2.4m) long and available in 100mm, 150mm, 200mm and 250mm heights. Add roughly 5–10% extra to allow for overlaps at the joints. As a rule of thumb:

• 100mm height — ideal for level lawns and shallow borders.
• 150–200mm height — the most popular all-rounder, good for retaining a little soil or mulch.
• 250mm height — best for raised borders, gravel paths or where you want a stronger retained edge.

Step-by-step installation

1. Mark your line. For straight borders, run a taut string line between pegs. For curves, lay a hose or rope on the ground and adjust until the shape looks right — this becomes your guide.
2. Cut a slot. Push your spade straight down along the marked line to the depth you want buried, working along the whole run to open a narrow slot. Keep the cut vertical so the steel sits upright.
3. Position the first strip. Stand the edging in the slot at one end. Decide how much you want showing above the soil (the "reveal") — typically 20–40mm — and keep it consistent.
4. Drive it down. Tap along the top edge with a rubber mallet (or hammer onto a timber offcut) until the strip reaches your reveal height. Use a spirit level to keep the top consistent if you want a perfectly even line.
5. Overlap the next section. Butt or slightly overlap the end of the next strip against the first for a continuous, gap-free line, then drive it down to match. Overlapping keeps the run rigid and hides the joint.
6. Form curves gradually. Bend the steel into gentle curves by hand as you go — ease it into the slot bit by bit rather than forcing a sharp kink. For tighter curves, use shorter sections.
7. Firm the soil. Press the turf and soil back against both faces of the steel and tread it in. This locks the edging in place. Water the lawn edge to help it settle.

Pro tips for a flawless finish

• Mow-over height: Setting the reveal slightly below blade height lets you run the mower straight over the edge — no more strimming.
• Always protect the top edge when hammering; a timber offcut spreads the force and prevents denting.
• Wear gloves — factory-cut steel edges can be sharp.
• Work with the weather: slightly damp soil cuts cleaner and grips the steel better than bone-dry or waterlogged ground.
• Let it weather: bare steel develops a natural patina over time, blending softly into the border.

How deep should steel lawn edging be buried?

As a guide, bury at least half the strip's height for stability, leaving a 20–40mm reveal above ground. On a 150mm strip that means roughly 110–130mm in the ground. Deeper burial gives a more rigid, frost-resistant edge — important in UK winters where ground movement can heave shallow edging.

Frequently asked questions

Can steel lawn edging bend around curves?

Yes. 3mm steel edging flexes enough to follow gentle, flowing curves by hand. For tight radii, use shorter sections and ease them in gradually.

Will steel edging rust?

Bare steel develops a natural protective patina over time — the same weathering process behind Corten weathering steel — which is part of the appeal as it mellows into the garden. This surface weathering does not compromise the strength of 3mm steel for many years.

Do I need to concrete steel edging in?

No. For lawns and borders, driving it into a spade-cut slot and firming the soil is enough. Concrete is only worth considering for heavy-traffic vehicular edges.

How do I join two lengths of edging?

Simply overlap or butt the ends together as you install. Overlapping by a few centimetres gives the strongest, most seamless joint.

Is steel edging safe around lawns and children?

Once installed with a sensible reveal height and the soil firmed on both sides, the exposed edge is minimal. Keep the reveal low (20–30mm) in family gardens for extra peace of mind.

Get started

Ready to sharpen up your borders? Our 3mm steel garden edging is made in Britain, available in four heights, and ships ready to install with the method above. Pair it with Corten steel planters for a coordinated, low-maintenance garden that looks professionally landscaped.