About us

Cox Costello & Horne is a leading regional accountancy firm of chartered accountants.

We offer a wide range of advisory services that are designed to make your business and personal tax return more tax-efficient in the short, medium and long term – our services range from strategic accountancy planning to pragmatic advice on personal tax returns.

Cox Costello & Horne prides itself on becoming an integral part of its clients’ business to ensure they operate a best-practice accounting approach, which serves to optimise business performance and maximise profit.

Founded in Rickmansworth in 1997 by Mike Cox and Dermot Costello, our London office then opened in 2014 and the Rickmansworth office is now located in Moor Park.

We have a team of professionals operating from both offices and Cox Costello & Horne invests continually in its own team to ensure a highly- motivated and highly-qualified workforce, and we adopt the latest accountancy software and tools to help us deliver an excellent service to all our clients, regardless of their size or turnover. Our advice and support goes beyond pure accountancy and we provide strategic financial advice to all our clients on a business and personal level.

We are regulated by the Institute of Chartered Accountants in England and Wales in relation to our obligations under the Money Laundering Regulations 2007 and must undertake those checks that we deem necessary to satisfy ourselves as to our clients' identity and, if relevant, the source of their funds.