About Us

The Ronez operations supply the Channel Islands with aggregates, ready-mixed concrete, asphalt and precast concrete products. Operating out of St John’s Quarry in Jersey and Les Vardes Quarry and Vale Castle in Guernsey, we offer a full range of high-quality construction materials.

Quarrying activity on our sites can be traced back to 1869 serving the island’s needs for quarried stone. We have grown and developed and now manufacture a diverse range of construction materials and undertake contracting services.

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Crushed rock aggregates produced at the Ronez quarries are supplied direct to the local construction industry, as well as forming the basis for an extensive range of construction products including ready mixed concrete, asphalt and concrete products.

Ready-Mixed Concrete

Our ready-mixed concrete plants in Jersey and Guernsey supply a range of products from floor screeds to designed mixes for structural applications.


We are able to provide a wide range of asphalt products from base course to specially designed mixes in accordance with the British / European standards.

Road Surfacing

The road contracts department in Guernsey and Pallot Tarmac Ltd in Jersey, serve the surfacing, trench reinstatement and contracting needs of the Islands roads and infrastructures.

Precast Concrete Products

We manufacture a range of dense, lightweight and high strength concrete blocks along with precast kerbs, edgings and paving products.

Cementitious Products

We are the principal importer of cementitious products into the Channel Islands, using our own bulk tanker, the MV Ronez. The powder is transferred through our silo terminals that you see at the Ports in Jersey and Guernsey.

SigmaRoc brands from Ronez

Allen Concrete, Poundfield Products Ltd, G D Harries and Sons Ltd, Johnston Quarry Group, CCP Building Products Ltd, RightCast, Foelbach Quarry, Benelux, Nordkalk and Carrieres Du Hainaut.