Deirdre Nagle


Deirdre is a Partner and Head of our Planning and Environmental Law team. She practises in both contentious and non-contentious planning and environmental law. 

Deirdre advises and represents state bodies, banks, developers, contractors, engineers, and other construction professionals on energy, planning and environmental matters.  

Prior to joining the firm Deirdre worked for a state body responsible for the development of energy infrastructure. She has extensive experience in advising and acting for state bodies on major projects relating to all aspects of the consenting process including compulsory acquisition. 


  • Planning Law
  • Environmental Law
  • Litigation / Arbitration / Mediation
  • Energy Law
  • Compulsory Acquisition


Legal 500, 2021

Deirdre is ranked as a ‘Next Generation Partner’. She is an “amazing” and “exceptional planning and environmental lawyer with massive experience in large and complex projects.

Legal 500, 2020

Deirdre is “a dedicated, client focused and hardworking lawyer with exceptional knowledge and expertise".

Recent Work

  • Deirdre has acted in numerous High Court, Commercial Court, Court of Appeal and Supreme Court matters as well as before the Court of Justice of the European Union. 
  • Deirdre regularly acts in oral hearings before An Bord Pleanála. Deirdre advises in relation to the preparation of applications for consents including advising from the outset of a project, attendance at pre-application meetings with An Bord Pleanála, advising on Environmental Impact Assessment and Appropriate Assessment including the preparation of Environmental Impact Statements and Natura Impact Statements.

Speaking Engagements & Teaching

  • Deirdre spoke at the National Construction Summit in May 2018.

  • Deirdre regularly lectures and tutors at the Law Society