Onyx (Building Consultancy) LLP is a Chartered Building Surveying Practice, operating on a national basis. We are authorised and regulated by the Royal Institution of Chartered Surveyors. An established and continually developing practice of professionals possessing over 20 years experience operating in the Private and Public Sectors. This includes involvement on schemes of varying sizes in the Residential and Commercial markets including New Build and Refurbishment, Extension and Maintenance of Existing Buildings.