About Us

In 2004, Derek Patterson founded Barnhill Bookkeeping Ltd, offering outsource and onsite bookkeeping services to a varied client base.

Barnhill pride themselves in giving customers a personal service where we will call to their businesses to give advice when required and carry out tasks from basic bookkeeping to full management and financial accounts. When space is at a premium, we can also work off-site and can use remote access if required to gain access to computer records in the clients premises.

We are different from smaller bookkeepers as we do not just provide date-entry services but use the information given to us to help reduce processes, costs and increase efficiencies and productivity.

We are different from Accountants in that we can provide full financial statements but also with a personal service where we are available to explain anything to our clients about their financial requirements.

We also specialise in helping New Startups by giving them advice on all financial aspects of business.

Clients include: Hardware Shops, Pubs, Funeral Directors, sole traders, self-employed, TV Production Companies, Magazine Publishers and International Civil Engineering Companies.

Derek is also credited as Production Accountant on a number of Mint Productions such as “Who do you think you are”, “Haughey” and “Bertie”, which were shown on RTE Television and later released on DVD.

Specialties: Payroll, Bookkeeping, Management Accounts, Tax

We Are Barnhill

Derek Patterson


Derek Patterson was born in Dublin Ireland where he later began his accountancy studies in Plunkett College, Whitehall. In 1988 Derek joined the team at Grant Thornton Chartered Accountants…

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Maria Patterson


Maria Patterson is originally from Dublin and has been a member of the Barnhill Bookkeeping team since its inception. She began her career in Insurance with J. C. Collins & Co Ltd…

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What our clients say about us

  • Barnhill have been there for us from the first day in business giving helpful and beneficial advice along the way. As a new company it was great to know they were only a phone call away no matter how small the query. We can get on with running our business knowing everything is taken care of.
    Peter GilmartinP&P Gilmartin Ltd.
  • Having recently started using Quickbooks after using other packages for years I can safely say I am a convert! The training was professional and the trainer extremely knowledgeable on both the package but also accounting and everything was explained in a down to earth & easy to understand manner.
    Sandra Harvey Temple Bar Company
  • Thank you for the training you did with us on Quick books, since you provided the one on one training you have made my life so much easier and faster in providing clients with quotes from Quick books and showing me better practices with the accounts package that make my life easier, I should of done it years ago.
    Jenny O’FlynnThe Event Planner
  • Working with Barnhill is very easy and great value for money. Over the last 3 years they have prepared our monthly management accounts leading to a complete accounts file that we present to our auditors annually, very shortly after our year end. We are always looking at ways to streamline our business and improve efficiency. Recently Barnhill took charge of our fortnightly and monthly payroll. This helps reduce our in house workload and is excellent for information confidentiality especially within a small office environment. On a general point Barnhill has been instrumental in real cost savings through recommendations regarding IT, telecoms, transport and office / buildings services. Thank you for your consultation and recommendations, it has been great working with Barnhill .
    Patrick SandsFood Solutions Ltd.
  • After upgrading to Quickbooks I was feeling overwhelmed by all of the new features. Derek came to the office to train me and was so helpful. No question was too small as he took me through it step by step and simplified the process” Marese Lynam – Lynam Engineering Ltd
    Marese LynamLynam Engineering Ltd
  • I would recommend Derek and Ash / Accountancy Software.ie to anyone considering upgrading or changing their accounts software/package. I couldn’t recommend them enough. Our experience has been a very smooth and rewarding process. I anticipate that we will continue to go to Quickbooks/Accountancy Software.ie in the future. We are delighted to send our business their way!  In my experience you cannot buy this kind of service.
    Lisa NeedhamCorporate Audio Visual Services