Thornton O'Connor

Established reputations as experts in

the planning field with 25 years project experience

We're here to help

Who We Are

Thornton O’Connor Town Planning is one of Ireland’s leading planning consultancies providing strategic, specialist and technical planning services to a wide range of clients. The company is managed by Directors Patricia Thornton and Sadhbh O’Connor, who have 25 years experience in planning consultancy and have established reputations as experts in the planning field. Our extensive experience and expertise brings a comprehensive understanding of the planning system and the development process, which allows us to guide our Clients through each individual project.

We offer a national planning service from our offices in Dundrum, South County Dublin and have worked across every Local Authority in the Country on a range of projects from one-off rural dwellings to mixed-use town centre schemes.

The practice regularly works as part of multi-disciplinary teams with other professionals. We therefore can address the varying needs of projects by recommending the services of other specialists such as architects, engineers, landscape designers, historic buildings consultants, archaeologists, arborists, etc as required.

Patricia Thornton

Patricia Thornton


Patricia Thornton graduated from University College Dublin with a Master of Regional and Urban Planning Degree, following a Bachelor of Science (Surveying) from Trinity College, Dublin and a Diploma in Property Economics from the Dublin Institute of Technology.

Patricia has been in private practice since 2003 before founding Thornton O’Connor Town Planning in 2016. Prior to working in private practice, Patricia began her career in Local Government.

Patricia’s wide-ranging background and extensive planning experience, aligned with her commercial understanding of projects, allows her to bring a multi-faceted approach to all projects across the planning and development sector.

Patricia has been involved in a wide range of projects across the Country including shopping centres, a large-scale retail warehouse, restaurants, office developments, mixed-use town centre schemes, hotels and hotel estates, student accommodation, housing estates and apartment developments, one-off rural dwellings, sports and leisure facilities, educational complexes and park and ride facilities.

Patricia is a Corporate Member of the Irish Planning Institute.

Sadhbh O'Connor

Sadhbh O'Connor


Sadhbh has a Primary Degree in Geography and Sociology from University College Dublin, which she followed with a Masters in Regional and Urban Planning, also from University College Dublin.

Sadhbh has been in private practice since 2006 before founding Thornton O’Connor Town Planning in 2016.

Sadhbh has developed an extensive understanding of all aspects of the planning industry throughout Ireland and has a proven track of achieving successful outcomes for Clients. Sadhbh has expertise in the planning, co-ordination and execution of a wide range of project types including residential (from one-off dwellings to large scale developments), commercial/office schemes, town centre retail facilities, industrial developments, hotels/nursing homes, student accommodation, integrated tourism facilities and rezoning of lands.

Sadhbh is a Corporate member of the Irish Planning Institute.

Planning Strategists

Forward Thinking

Problem Solvers

Client Focused