Last Modified: January 29, 2024

MOT Type 1 Sub-Base

Foundations in Outdoor Construction

Close up of mot type 1 sub base

By Ben Parrot - Landscape Gardener & Amateur Geologist


Stone landscaping material and construction aggregate

Geological name(s):


Other Name(s):

Type 1 MOT, MOT type 1 sub base, MOT sub base, type 1 MOT sub base, MOT sub base type 1, MOT type 1 aggregate, MOT type 1 stone, hardcore base, crusher run


Welcome to the only encyclopaedia for decorative aggregates and landscaping materials. MOT type 1, also known as hardcore base, is an economical crushed aggregate known for its remarkable load-bearing properties and versatility. Type 1 MOT is an aggregate regulated by the department of transport and a fundamental element in outdoor construction. Unique in its composition and use, this aggregate has a wide array of applications, from creating robust foundations for driveways to serving as a stable base for block paving, patios and pathways.

This is a comprehensive encyclopaedia listing about MOT type 1, a hardscape and construction aggregate. It details the product's specifications, accompanied by photographs, and outlines its benefits, applications, and incompatibilities as a landscaping material. Additionally, this entry serves as a gateway to a wealth of DIY resources, with a list of comparable alternatives, articles offering design inspiration and fundamental principles, and a collection of straightforward, step-by-step instructions for constructing your own hardscaping features.

MOT Type 1 Specifications





fall safety





fish friendly

eco friendly



diy friendly




Generally limestone, granite or basalt


Generally grey to brown



Mot type 1 close up

Size Range



Fall Safety

Unsuitable for play surfaces





Fish Friendly


Close up of crushed aggregate. Jpg






Neutral or alkaline



Crushed aggregate path


MOT Type 1 sub-base is a strong and stable material used for building long-lasting roads, highways, and pathways. It's made up of crushed rock and stones, which provide a solid base layer that can withstand heavy traffic loads and pressure from vehicles. Its granular structure also allows for efficient drainage, preventing water accumulation and subsequent damage.

MOT type 1 sub-base is a versatile aggregate that meets transport authorities' specifications for quality and consistency. It's cost-effective and available in both quarried and recycled forms, making it an environmentally considerate option. Its physical attributes, versatility, and affordability make it an indispensable choice for construction and civil engineering projects.

  • Improves drainage
  • Hard-wearing
  • Eco-friendly, sustainable
  • Low-maintenance
  • Moisture retention
  • pH alkaline or neutral
  • Heavy load bearing
  • Sub-base
  • Easy to lay


MOT Type 1 products are predominantly used in constructing driveways, car parks, and foundations for paving. Its strength and compactability make it an ideal base material for heavy-use areas. Here are many of the common applications:

  1. 1
    Road Construction: MOT Type 1 is commonly used as a sub-base material for road construction. It provides a stable foundation for the road surface and helps distribute the load of vehicles evenly.
  2. 2
    Pathways and Footpaths: It is also suitable for creating pathways and footpaths as an economical option offering stability and durability.
  3. 3
    Driveways: As a sub-base for driveways, it provides a solid foundation that can withstand the weight of vehicles and prevent sinking or cracking.
  4. 4
    Hardstandings: MOT Type 1 is often used for creating hardstandings, which are areas designed to support heavy loads. It is commonly used in industrial settings, such as loading bays and storage yards.
  5. 5
    Car Parks: It can withstand the weight of vehicles and provide a stable surface for parking areas.
  6. 6
    Construction Sites: Type 1 MOT is used on construction sites as a temporary road surface or access road. It allows construction vehicles to move around the site safely and provides stability for heavy machinery.
  7. 7
    Landscaping: MOT Type 1 can be used in landscaping projects, such as creating a base for patios, garden paths, or retaining walls. It provides a solid foundation for outdoor structures.

In the following section, we list common type 1 MOT uses in landscaping. Wherever there is a hyperlink beside an item, an article from Outdoor Aggregates about the topic is available.

Decorative stone garden path

Inspiration and Informational Articles

  • MOT sub-base type 1
  • Landscaping with MOT type 1
  • Sub-base for driveways
  • MOT type 1 pathways

DIY-Friendly How-To Guides

  • How to lay a MOT type 1 sub-base 
  • How to make a MOT type 1 pathway

Need to work out how many stone chippings your  project needs? Try our free gravel calculator.

Unsuitable For

The following list represents the kinds of applications that MOT type 1 may not be suitable for:

  1. 1
    Areas with fine plantings: If you have creepers or low-growing plants in your garden gravel can make it harder for these plants to thrive, as it may interfere with their root systems as they try to grow.
  2. 2
    Play surfaces
Hardcore visible under tarmac around a lamp post

Similar Alternatives to MOT Type 1

The following is a list of decorative aggregates which are alternatives to MOT type 1. They may offer you a more suitable variation on the primary colour, a more economical option, or a close substitute for cases where the base material may be unsuitable for the project you are creating, e.g. limestone is not fish-friendly, where granite is.










0-50mm (0.4-2")





0-50mm (0.4-2")



MOT type 1 scalpings



0-50mm (0.4-2")



Crushed concrete



0-50mm (0.4-2")








Under £80







Paving slabs and a shovel in a muddy garden

Maintaining an area with MOT type 1 is relatively straightforward. Regular inspection and minor compaction may be required in areas with heavy traffic. Its durability ensures a long-lasting service performance with minimal upkeep. When used with weed control fabric, it can significantly reduce the time spent on upkeep.

Purchasing Tips

Childs play area with rubber saftey surface

When you're purchasing MOT Type 1 for your landscaping project, it's important to keep quality and source in mind. You should only look for certified materials that meet the required specifications, and don't hesitate to ask for compliance documents, being aware of the possibility that contamination may be a problem that could cause big issues in the future.

Although recycled options are available, make sure that they have the necessary structural integrity. It's always a good idea to compare prices from multiple suppliers for MOT Type 1, and ensure that the delivery options and costs are suitable for your site. Make sure you consider timing of delivery to avoid delays and storage issues. Purchasing the right type of MOT Type 1 will ensure a successful and durable outcome for your landscaping project.

Our MOT calculator can provide you with a fast and impartial estimate for your project requirements by simply measuring the space. This is one of the most efficient and easiest ways to ensure you order the correct amount of material, preventing shortages or overspending. Ordering a MOT type 1 bulk bag or loose loads can often provide better value than buying smaller quantities, making accurate calculations important for saving both time and money. Additionally, it is crucial to consider delivery logistics, such as vehicle access to the site.


What is MOT type 1 sub-base?

MOT Type 1 Sub Base is a crushed aggregate used primarily as a base material for paths, driveways, and paving, known for its excellent load-bearing properties.

Can you make concrete with MOT Type 1?

No, MOT Type 1 is not suitable for making concrete; it's used as a base layer.

How thick should MOT Type 1 be?

The recommended depth varies, typically around 100-150mm (4-6") for driveways and pathways.

What does Type 1 MOT mean?

Type 1 MOT refers to the standardised grading for delivery of this crushed aggregate, ensuring consistent quality and size which is 0-40mm.

What is the difference between Type 1 and MOT type 2?

MOT Type 1 is of finer quality materials and better compaction compared to the coarser MOT Type 2, which is used for less demanding applications.

There are many wonderful types of gravel and aggregates available for your project needs. Check them out!

About the author 

Ben Parrot is a landscape gardener and amateur geologist. He is the founder of Outdoor Aggregates, with the mission to create the first encyclopaedia for decorative aggregates. From natural stone through to decorative bark, these aggregates are critical to garden and landscape design, universally.

The problem: There isn't any place where all the different types of decorative landscaping materials and construction aggregates can be found, nor are the specifications of each type readily available. So, enriched by his extensive experience, and inspired by the timeless elegance and raw beauty of stone and rock, etched by nature's artistry over millennia, Outdoor Aggregates was born.