O'Brien Predergast and Associates - Legal Mapping and Boundary Surveyors - About Us

About OBPA

About O’Brien Prendergast & Associates

At OBPA, we strive for perfection. To enable us deliver this, we have the highest qualifications available to inform our preferred approach, our choice of appropriate standards, and achieving the high quality of services we provide. As Chartered Surveyors, we are encouraged to deliver the highest level of professional service, and OBPA will take pride in meeting this requirement.

We strive to differentiate OBPA services from the full range of surveying and mapping services other companies provide who attempt to be experts at everything. OBPA will focus solely on a niche market supplying Boundary Surveying and Legal Mapping only. At OBPA we focus solely on our client’s needs, we do not take short cuts, and our approach is to be the experts for legal mapping in Ireland.

Our extensive research to date informs us that approximately one third of Irish landowners have a property boundary issue, and legal mapping issues are growing day by day in Ireland. Many of these boundary and mapping issues eventually arise as disputes over boundaries, adverse possession, rights of way, encroachment, etc. Boundary disputes over large or small areas of land can destroy friendships and adversely affect relations between neighbours, can pass from generation to generation and can also sour community relations. Old methods of land measurement, and inaccurate mapping are at the heart of the problem. These problems can be resolved, but it normally takes far longer than originally anticipated.

OBPA intend to address this information deficiency by utilising modern surveying methods and creating clear legal mapping to an accuracy which cannot be challenged. Landowners need to ask themselves “do I have marketable Title for my property?” Any unresolved legal mapping issues can significantly delay a property sale, so why wait to find out the problem later? Ask the question now and resolve any issues identified when you have the time to do so.

If you would like to know more about the range of mapping issues causing concern in Ireland, please visit our publication section.

If you think you have an issue on your property boundary of a legal mapping issue, please do not hesitate to contact Daragh or Paddy. We are here to advise you and help you resolve these problems.


Dr. Daragh O’Brien


Dr. O’Brien has a PhD in Land Law from the Dublin Institute of Technology (DIT) and has vast experience with regard to quantifying the incidence and identifying the different types of land issues and disputes occurring in Ireland. These include Boundary Disputes, Adverse Possession, Right of Ways, Encroachments, Land Registration issues and other areas of Land Law. As well as representing DIT on an International scale with his research, he has published in papers and journals including, “To Gauge an Understanding of How Boundaries are Perceived in Ireland by Landowners”, “Proposed Guidebook on Established Case Law for Land Surveyors on Property Boundaries and Why Property Boundary Disputes are Increasing in Ireland?”, Dr. O’Brien’s main interest is in Irish property Law, Legal mapping and the current property boundary problem in Ireland. Dr. O’Brien is a Chartered Surveyor from the Society of Chartered Surveyors Ireland and the Royal Institute of Chartered Surveyors.

Patrick Prendergast - OBPA - Legal Mapping and Boundary Surveying

Dr. Patrick Prendergast


Dr. Prendergast is Ireland’s foremost expert on Legal Mapping issues and property boundary expert. Dr. Prendergast has previously served as a military officer in Ordnance Survey Ireland throughout the 1980’s and early 1990’s as part of their senior management team and has been actively involved in the development of the surveying profession in Ireland via his participation on the council of the Irish Institution of Surveyors (IIS) where he served as President from 2000 to 2002. He also represented Ireland on the European umbrella organisation for national professional associations of Surveyors (CLGE) where he also served as President from 1998 to 2001. He received his PhD from Trinity College Dublin in 2005. In 2012, Dr. Prendergast was awarded Higher Diploma in Mediation & Conflict Resolution from University College Dublin and has the ample capabilities of undertaking negotiations, within agreed parameters, on behalf of Department, to acquire necessary land and access thereto (through purchase, lease or other agreement). Dr. Prendergast is a Fellow Chartered Surveyor from the Society of Chartered Surveyors Ireland and the Royal Institute of Chartered Surveyors.