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June 4, 2026
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Aggregate and Base Estimating
MOT Type 1: how much should you order?
Use this guide to sense-check the calculator result, compare buying formats, and move from raw volume into a more reliable order.
How to use it
Planning before buying
Use this guide for a planning check, then confirm the final order or quote against live product data and site conditions.
Why trust it
See how the site is maintained
Read the calculator methodology and editorial policy for the standards behind these pages.
Quick answer
Use the job dimensions to build a sensible order quantity for MOT Type 1. Use it with the MOT Type 1 Calculator to turn a neat quantity into a safer buying decision.
When this guide helps
Turn the driveway or patio footprint and compacted sub-base depth into a safer Type 1 order before the merchant quantity is locked in.
Watch most
Compacted depth, density, edge thickening, and level corrections usually move the final Type 1 order most.
Best next move
Pressure-test the compacted build-up first, then compare whether Type 1, hardcore, bulk bags, or loose tonnes suit the job and access best.
Use the calculator first
Start with MOT Type 1 Calculator for the first number, then use this page to pressure-test pack sizes, spare stock, linked materials, and the parts of the order that usually get missed.
What this page adds after the maths
It moves from the neat measured result into the real buying decision: pack size, stock length, spare allowance, linked materials, and what should still be checked before ordering.
Buying assumption to keep straight
MOT Type 1 estimates work best when the footprint, compacted depth, edge detail, and the intended sub-base build-up are clear before the order is placed.
Common buying miss
The common misses are underestimating compacted depth, forgetting edge thickening or levelling corrections, and assuming the loose-delivered quantity matches the installed layer without checking compaction.
Buying decisions after the maths
These are the choices that usually change the real order once the first quantity is roughly right.
Bulk bag route vs loose tonnes
Bulk bags can suit many domestic jobs, but larger drives often look better value once loose delivery and spreading access are compared properly.
Neat footprint vs real base build-up
A clean footprint can still understate the true Type 1 order if edge thickening, turning areas, or weak spots need extra depth.
Type 1 route vs deeper fill route
A named sub-base layer only solves part of the build-up if deeper fill, hardcore, or membrane separation still need separate quantities.
Where buying totals usually move
Use these examples to see where pack size, spare stock, or linked materials push the final order.
Simple driveway or patio base
Straight footprints usually give the cleanest Type 1 estimate, but the compacted depth and edge build-up still need checking.
Weak spots or edge thickening
Low patches, turning zones, and edges can quickly add more Type 1 than the neat footprint suggests.
Delivery route check
Comparing bulk bags, loose tonnes, and access is often the step that turns the first estimate into a realistic order.
Practical checks before you buy or brief
Use these prompts to move from a neat guide answer into a cleaner real-world decision.
- Confirm the footprint, compacted Type 1 depth, and whether the design needs edge thickening, turning areas, or level correction.
- Check the actual Type 1 grade, density assumption, and whether the supplier prices by bulk bag or loose tonne.
- Compare delivery access, unloading, and whether membrane, bedding, or nearby trench layers still need separate checks.
Project plans that use this guide
Open one of these planners when the guide is part of a larger job with connected quantities, accessories, and pricing questions.
Workflow6 calculators
Patio Planner
A patio order is more than a slab count. Work from the finished area into slabs, Type 1, bedding sand, jointing, edge details, and budget checks before anything is ordered.
Plan this jobWorkflow6 calculators
Driveway Base Planner
Driveway base costs rise or fall on depth, compaction, membrane, delivery access, and the difference between fill and finished surface material. Plan those layers before comparing quotes.
Plan this jobWorkflow5 calculators
Drainage Trench Planner
Drainage quotes are easier to compare when the trench is split into pipe, bedding, gravel surround, membrane, fittings, spoil, and reinstatement instead of one broad allowance.
Plan this jobNext step links
Open the full Aggregate and Base Estimating project hub or go straight to the MOT Type 1 Calculator.
Ready to turn this guide into a quote request?
Once you understand the assumptions and buying choices, send builders or merchants the same measured scope so the prices are easier to compare fairly.
- Confirm what the quote should include: materials only, labour only, or both.
- State access, finish level, timing, and any unknowns clearly.
- Ask each supplier or installer to price the same scope and exclusions.
You can also open the wider Aggregate and Base Estimating project hub if the quote depends on more than one material.
How should I use MOT Type 1 Quantity Guide?
Use it with the MOT Type 1 Calculator to pressure-test the compacted build-up, edge detail, and merchant delivery route before you order.
What usually changes the MOT Type 1 Quantity Guide answer most?
Compacted depth, density, edge thickening, and whether the supplier prices by bulk bag or loose tonne usually move the result most.
Should I round up the result?
Usually yes. Weak spots, compaction, and delivery minimums can justify a modest spare rather than landing exactly on the paper total.