Harmer Slater is an independent firm of Chartered Accountants and Business Advisers with offices in Middlesex and Surrey.

We provide a friendly and comprehensive range of professional accounting advisory, assurance, tax and business advisory.

Our services are tailored to meet the needs of individuals and organisations of all sizes, ranging from small privately owned businesses to UK subsidiaries of prestigious multi-national companies.

About us

Meet the team

We pride ourselves on providing a personal service at a competitive price and being an approachable, flexible and trusted business adviser.


  • Are your fees based on turnover?
  • No, our fees are tailored to each client and are dependent on the nature of each piece of work

  • Can you take over all accounting management?
  • Absolutely! We offer a personalized service offering as much, or as little, as you require

  • Do you provide support during the year to your clients?
  • Yes, our clients can call us anytime during the year to get support they need



1. We are bringing you over 20 years of diverse accounting and financial experience


2. Harmer Slater have an enthusiastic and energised team focused on your individual needs


3. Offering personal service with professional ethics to ensure optimum results


                          2 OFFICES



Chief Controller of Finance

Harmer Slater’s expertise and knowledge is crucial in helping us achieve our business objectives and we can always rely on them to provide a high level of service on time

Chief Controller of Finance
Clas Ohlson Limited


Operating a small consultancy but serving international clients can be tough. There is zero room for error.

Outsourcing my all my accounting and payroll to Harmer Slater has allowed me to concentrate on my business and not worry about the financials.

In 18 years of business, I have never trusted a service with such responsibility, however Harmer Slater have proved themselves to be absolutely vital to the success of my company. Peace of mind, comfort, excellent advice and assurance delivered by ‘humans’, whose communication I actually look forward to…

A most unique collective of talented and creative accountants, without whom I simply could not operate.

Lydia-Claire Halliday Consultancy Limited