Cob has been used in construction for hundreds of year and many of these buildings are still standing today.

 Cob Construction in Cornwall

The advantages of constructing with cob far outweigh the disadvantages.  Let's have a look:


  1. Cob constructions are appealing: They can contain nooks and crannies and can easily be sculpted into various shapes and sizes.
  2. Cob is inexpensive: It is a mixture of subsoil, straw and water and most of these ingredients can be found on the land you are building on.
  3. Cob has excellent thermal properties: Houses built with cob have thick walls which have an immense thermal mass, keeping the building warm in the winter and cool in the summer.
  4. Cob constructions are environmentally friendly: The ingredients used contain no toxins and are completely natural.
  5. Cob houses are quiet: Due to the thickness of the constructed walls, the internal space is much quieter.


  1. Constructing with cob is time consuming: Sourcing, mixing and constructing with cob is very labour intensive.

Cob Construction in Cornwall

Building with cob is much easier that modern conventional construction.  Below are some important elements to remember during the construction process.

  • As with all buildings, you need to start with a good foundation. 
  • Construct a stone plinth for the cob wall to be built on so that it does not come into direct contact with the ground.
  • Throughout the cob wall construction process it is important to have a workable and pliable material.  Traditionally, cob walls are constructed in lifts, sometimes as high as half a metre.  During the summer months a lift can be introduced each day.
  • Windows and doors can be introduced during the construction process, or openings can be made at a later date.
  • Make sure you have a good overhang on your roof to protect the cob wall.

Cob Construction in Cornwall

We will be at the Royal Cornwall Show again this year, so if you would like to have a go at making a cob brick come along and see us.

For more information about constructing with cob, please visit our website.

Of course, with all constructions they need to be properly maintained and we, Leslie Cornell Building Restoration Ltd, are the Team to help you do that.  If you require our assistance, please Contact us.

Cob and Lime Specialists Cornwall and Isles of Scilly - Cob Repairs Cornwall and Isles of Scilly - Cob Assessment Surveys Cornwall and Isles of Scilly - Building Restoration Cornwall and Isles of Scilly.



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Leslie Cornell
Unit 13/14 St Austell Bay Business Park
Par Moor Road
St Austell
PL25 3RF

Tel: 01726 337577