About Us

The Firm

Quantus Advisory is a Dublin based firm of Accountants. It is registered with the Association of Chartered Certified Accountants in Ireland to carry out audit work.

It was established in 1982 and traded under L'Estrange and Company until it rebranded as Quantus Advisory.

The firm has a number of SME clients in various sectors around the country. we give a personal reliable service of the highest quality to all our clients.

The firm is known as a specialist in the hotel tourism and leisure sector. We are known as a market leader in providing advice to the Licensed Trade as it has unrivalled expertise and experience in this area. We act for many landmark premises in Dublin and countrywide.

Our offices are conveniently located at College House, 71-73 Rock Road, Blackrock, Co Dublin. We are available outside office hours.


  • Audit & Accountancy
  • Taxation
  • Directors Income Tax
  • PAYE Tax Returns
  • Rental Property Income
  • Income Tax Return
  • Bookkeeping
  • Business Advisory
  • Outsourced Payroll
  • VAT
  • Forensic & Investigation
  • Starting a New Business
  • Changing Accountants
  • Company Formations

Meet the Team


Damian McCann


Damian qualified in 1991 and is a fellow of the Association of Chartered Certified Accountants. He worked in a number of practices in Dublin, before joining L'Estrange & Co( now Quantus Advisory). Damian has over 25 years experience and has gained an extensive and thorough knowledge of all aspects of business life, including start-ups, acquisitions, bank and Revenue negotiations and re- finances. He acts for a broad range of clients. He prides himself on offering the highest standards of service, consistently, to all clients. He is very commercially minded and provides in depth advice to clients.

Email: damian@quantusadvisory.ie


Tony Mcdonagh


Tony is a member of the Association of Accounting Technicians and a fellow of the Association of Chartered Certified Accountants. Tony has an extensive knowledge in the licenced trade having worked in the family pub business for years. Tony has a proven track record in business development assisting clients into many new projects. Tony has specialised in bank negotiations over many years to secure funding for acquisitions/refinancing or debt settlements. Tony, through his related business activities is a member of the Irish small and medium enterprises association. This has given Tony a great platform for networking and an understanding for business needs.

Email: tony@quantusadvisory.ie


Barry Lane


Barry is a fellow of the Institute of Certified Public Accountants in Ireland since 2006. Barry trained in L'Estrange & Co (now Quantus Advisory), left to work in other firms and brought that experience back with him. He has considerable experience and knowledge of small and medium enterprises, especially the food and beverage industries. Barry is a son of an entrepreneur in the food and hospitality sector, which gave him early experience of owning and managing a business and the challenges it faced.

Email: barry@quantusadvisory.ie