The Hillhouse Group designs, manufactures and supplies dry coated stone and concrete products to meet customer specifications and requirements in a cost effective and safe manner.
Hillhouse Quarry is a family run business that has been producing crushed aggregate since 1907, remaining in the same family ownership until the present day.
In 1907 the plant was capable of producing 150 tonnes of stone per day, by 1922 it was capable of producing 1000 tonnes per day and presently produces up to 6000 tonnes per day.
With the introduction of Tarmacadam, the Company became involved in the production of coated stone in the early thirties
There are now three modern coating plants located in the Quarry, two of which produce hot mix materials and one which produces cold mixxes.

 
In 1966 a ready mixed concrete plant was built in the Quarry to satisfy the growing demand for high quality concrete. Today, in addition to the production of 6000 tonnes of cleanstone, the Company has the capacity to produce 750 cubic metres of concrete and 2000 tonnes of coated stone on a daily baasis

The Hillhouse Group has been developed by a number of acquisitions that Hillhouse began to make at the end of the 1980's. Each of these companies was strategically chosen to broaden the Group's range of products and services to the construction industry:

1991 - Kyle Tarmacadam: Specialised surfacing company located in the Irvine area
1992 - Craigiehill Quarry: Supplying the Kilmarnock area with crushed whinstone products
1994 - Hillhouse Blocks: Volume manufacturer of quality bricks and blocks to the construction industry, located in Irvine
1997 - Hillhouse Precast: Manufacturer of precast concrete stairs, floors, landings and other specialist items, located in Beith
1999 - Dick Precast: Manufacturers of Speciality Precast concrete products, located in Carnoustie
1999 - Wm Paton & Sons Ltd.: General building works and repairs, offices located in Ayr
2000 - McMillan Rome Ltd.: Manufacturers of Kerbing and Paving Slabs, located in Kilmarnnock