A&L Goodbody LLP’s dedicated team regularly handles complex environmental and planning matters for large corporates, private developers and financial institutions, as well as state bodies and local authorities. Well-positioned to advise on contentious and non-contentious mandates, the group is a go-to for advice on issues related to waste management, compliance and environmental assessments, and for the defence of environmental prosecutions. It also regularly acts for developers and owners in judicial review challenges, planning injunction proceedings, and advises on developments in the energy, housing, technology and pharmaceutical sectors. With ‘encyclopaedic knowledge’, Alison Fanagan SC leads the offering and is particularly renowned for the depth of her regulatory litigation and judicial review expertise. Fellow co-head Alan Roberts is an expert in planning and environmental issues related to large energy and infrastructure projects.

Arthur Cox‘s environment and planning team maintains its strong position in the market, particularly for large, complex and novel projects. It covers a wide range of contentious and non-contentious mandates for public and private clients spanning the energy, manufacturing, telecoms and housing sectors. The practice is adept at supporting clients through regulatory issues and litigation challenges to projects, and later with operational compliance. Leading the team is Danielle Conaghan, who has a proven track record in the renewable energy sector specifically, as does Jacinta Conway, who has experience in precedent-setting planning and environment cases. Yvonne Scannell is reputed for her water, waste and resources law expertise. Mark Thuillier joined in 2025.

Fieldfisher showcases a strong track record advising key public bodies regulating planning and the environment in Ireland, with a well-established client base including An Coimisiún Pleanála, the EPA, OPR, IFI, AFR and MARA. Led by JP McDowell, Zoe Richardson and Jonathan Moore, the team has a wealth of experience defending high-profile judicial review applications and related litigation in superior courts, often linked to permissions granted for development projects, environmental and waste licenses. Richardson oversees a significant number of judicial review and environmental enforcement proceedings, while Moore is another key team member who is well-versed in litigation and advisory work.

Highly regarded by clients, Mason Hayes & Curran Professional Services Ltd’s planning and environment team is known for its comprehensive advice on environmental issues, particularly related to high-profile and high-value infrastructure projects central to Ireland’s climate change strategy. Head of the team Deirdre Nagle utilises her deep expertise in planning and environmental law to assist private and state body developers to navigate the consenting system, and to mitigate the risk of and navigate judicial review proceedings. The team also benefits from Jay Sattin’s expertise in leading both complex contentious and non-contentious planning and environmental matters, and his circular economy specialism.

Matheson LLP‘s planning and environmental team is integrated within the firm’s broader disputes and investigations department. The group is equipped to advise on large developments and environmental risks and liabilities, and to defend environmental regulatory prosecutions. Its expertise spans planning applications, environmental assessments and licensing issues, as well as judicial review challenges and climate change litigation. With a high level of experience and knowledge in environmental dispute resolution and regulatory enforcement, Nicola Dunleavy SC jointly spearheads the offering, alongside Ruadhán Kenny, who is a key adviser to developers and funders and conducts due diligence on permitting and environmental issues. Maeve Delargy is another name to note.

Exemplifying a comprehensive environment and planning offering, McCann FitzGerald LLP is particularly well-placed to guide domestic and international clients through consenting processes and regulation for infrastructure projects, notably in the transport and energy sectors. The team provides strategic advice on a range of contentious and non-contentious mandates, including those related to transactions, complex environmental assessments and the prosecution and defence of judicial review challenges. The team is jointly led by expert Brendan Slattery, who specialises in energy security and the delivery of significant local and national projects; and Michelle Doyle, who is a strong choice for regulatory guidance and contentious mandates. Sinéad Martyn is another key lawyer for advice on onshore and offshore project developments, judicial review defence, and transactional and regulatory support.

The climate and environment team at Philip Lee LLP is a trusted adviser to both public and private sector clients, noted for handling complex and high-profile judicial reviews of planning and licensing decisions linked to development projects. As a key contact for project developers on consent procedures, Alice Whittaker and expert planning consultant Alison Hardiman spearhead the advisory offering, while Rachel Minch SC and Leonora Mullett lead the busy judicial review, enforcement and statutory appeal practice. The team also collaborates with other practice groups within the firm to support on transactional matters.

Beauchamps LLP‘s planning and environment group exemplifies in-depth knowledge of renewable energy, offshore consenting, data centres and housing sectors. The team is well-equipped to handle a wide array of mandates related to large projects, including judicial review proceedings. Reputed for its representation of state consenting authorities and development agencies, the team has notable experience in maritime consenting and large-scale housing development. With a strong pedigree in the field, Stuart Conaty leads the team and is supported by key team members Ainsley Heffernan and Jeanie Kelly.

Multinational corporates, public bodies and local authorities regularly turn to the environment and planning team at William Fry LLP for assistance with planning applications, oral hearings, judicial reviews and regulatory enforcement. The group has significant experience in high-profile litigation and projects relating to climate obligations, and energy, data and other infrastructure developments, with particular strength in offshore planning mandates. Jason Milne, who joined in 2025 to lead the team, adds to the depth of expertise provided by Michelle Martin.

Addleshaw Goddard‘s planning, infrastructure and consenting team assists individual and corporate applicants and objectors with planning processes related to developments and compliance. It also handles due diligence exercises, and environmental law compliance and prosecution mandates, which Margaret Austin has noted expertise in. Planning and environment team head Stephen Barry‘s arrival has bolstered the offering; he stands out for his record in defending judicial review proceedings.

The environmental and planning team at Byrne Wallace Shields LLP has established experience in both litigation and advisory work, serving a diverse client base, primarily composed of public sector clients. Mona Costelloe, who leads the team, is highly proficient in complex judicial review and other proceedings, which is a skill set shared by Valerie Hourigan.

Assisting with contentious and non-contentious mandates, the team at Eversheds Sutherland is reputed for its advice to large developers in the residential, data centre and renewable energy sectors. Commercial litigator Neil O’Mahony is geared to support with judicial review proceedings and other contentious mandates.

RDJ LLP‘s planning and environment team advises public and private sector clients on a host of planning and environmental issues associated with developments, with noted experience in judicial review proceedings and defending enforcement actions. Team head Finola McCarthy has noted experience advising on planning and environmental impact assessments on construction and engineering projects, and waste sector issues.