Garden SurveyorMOT Type 1 Calculator
Tonnes and bulk bags of MOT, compacted vs loose.
Clay / soft ground raises the default compacted depth by 50 mm and adds a geotextile membrane.
Restricted or very restricted access switches delivery from bulk bags to 25 kg hand-bagged bags, and drives the barrow / machinery recommendations below.
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Order what you need for this job
MOT Type 1 sub-base — bulk bags
Building Materials Nationwide
Need ~4 tonne
£35–£60 / tonne · ~£140–£240
Check price
Heavy-duty weed control membrane (for under gravel)
Amazon
Need ~17 m²
£15–£40 / roll · ~£15–£40
Check price
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Heads-up: MOT Type 1 is sold loose but laid compacted. The tonnes shown already include the ×1.25 compaction factor — order the figure above, not the surface volume. Why it matters: Bulk bags are typically 0.7–0.85 t, not 1 t. Check your supplier's bag weight before dividing.
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
MOT Type 1 sub-base — bulk bags
Building Materials Nationwide
Need ~4 tonne for your job
Crushed limestone MOT sub-base in 800 kg bulk bags, delivered to kerbside.
Check price at Building Materials NationwideGuide price: £35–£60 / tonne(~£140–£240 total)
Indicative · reviewed May 2026
MOT Type 3 (permeable sub-base) — bulk bag
Building Materials Nationwide
Need ~2 tonne for your job
Open-graded sub-base for SuDS-compliant permeable driveways and patios.
See options at Building Materials NationwideGuide price: £35–£60 / tonne(~£70–£120 total)
Indicative · reviewed May 2026
Scalpings / 6F2 — bulk bag
Building Materials Nationwide
Need ~2 tonne for your job
Economical crusher-run capping and hardcore fill below a Type 1 layer.
See options at Building Materials NationwideRecycled Type 1 (crushed concrete) — bulk bag
Building Materials Nationwide
Need ~2 tonne for your job
Budget recycled sub-base for paths, patios and light driveways.
See options at Building Materials Nationwide
Clean stone 20 mm (drainage) — bulk bag
Building Materials Nationwide
Need ~2 tonne for your job
Single-size clean stone for French drains, soakaways and pipe bedding.
See options at Building Materials Nationwide
- Grano / granite dust — bulk bagBuilding Materials Nationwide
Fine blinding and bedding layer over sub-base, under block paving.
Pre-filled qty: 2 tonne
- Hardcore / crushed brick — bulk bagBuilding Materials Nationwide
Bulk fill and capping below a compacted Type 1 sub-base.
Pre-filled qty: 2 tonne
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.