Sloping Site Calculator

Cut/fill, retaining guidance and stepped levels.

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Inputs

Length(m)

Width(m)

Height change(mm)

5 advanced inputs hidden. Switch to Advanced to fine-tune.

Confidencehigh· 85Complexitymedium· 30

Order what you need for this job

Dense concrete blocks (7N)
Building Materials Nationwide
Need ~17 m²
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Heavy-duty weed-control membrane
Amazon
Need ~17 m²
£15–£40 / roll · ~£15–£40
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Area: 15m²
Perimeter m: 16m
Cut / fill volume: 4.5m³
Retaining recommended?: Yes
Stepped levels: 2

Heads-up: Gentle slopes (under 1:20) can be absorbed in the build-up. Steeper than that and you're either excavating into the bank or building up — both have cost implications. Why it matters: Retaining walls over 1 m bring Building Regs into play — see the retaining-wall calc.

Quantities pre-filled from your calculation (15.0 m²). Partner links — we may earn a small commission if you buy, at no cost to you.

Essentials for this job

Dense concrete blocks (7N)
Building Materials Nationwide
Need ~17 m² for your job
Structural blocks for retaining walls and garden-room base foundations.
See options at Building Materials Nationwide

Quantities include a ~10% waste allowance. Guide prices are indicative UK ranges (materials only, inc. VAT) — always confirm with the supplier before ordering.

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Ad · Some links are sponsored. We may earn a small commission at no extra cost to you. Suppliers are chosen for fit, not commission.

This app provides general UK guidance and material estimates only. It is not legal, planning, engineering or building-control advice. Always confirm requirements with your local planning authority, building control, utility providers, manufacturers or qualified professionals.