Jarleth Heneghan

Partner

Jarleth is a Partner in William Fry’s Projects, Construction & Engineering and Alternative Dispute Resolution departments.

His practice is a mix of both contentious and non-contentious construction, projects and dispute resolution for State, international clients/intermediaries, developer, financial institutions, professional and contractor clients.

Jarleth advises on Irish and international construction and engineering bespoke and standard form agreements (e.g. RIAI, IEI, GCCC, JCT, NEC and FIDIC etc). He also advises on procurement and PPP/PFI. He also advises on alternative dispute resolution matters, including conciliation, mediation, adjudication, arbitration construction insolvency issues and rescue financing.

His experience includes advising:

the Developer on the development financing and construction of the Bolands Quay office and residential development and its forward sole to Google Ireland Limited.
daa on the procurement and development of the Dublin Airport Central office park and infrastructure at Dublin Airport, various complex projects across the DAA’s portfolio.
Circle K on all aspects of the acquisition, financing, development and operation of several service centres throughout Ireland.
Hammerson plc on the development of private rental sector residential apartments of Dundrum Town Centre.
Digital Realty Trust on the development of their new data centre at Profile Park, Dublin and refurbishment of existing date centres across their portfolio.
Irish Life on the development financing and contribution of two major office developments at George Quay and at 70 St Stephen’s Green Dublin.

Jarleth is also a chartered surveyor with significant experience acquired in asset property management having worked with top tier firms in the United Kingdom. His qualifications include: Fellow of RICS and SCSI, Fellow of CIArb and practising arbitrator: CEDR Panel member, Chartered member of CIOB, CEDR qualified mediator and Solicitor, Law Society of Ireland and England and Wales – including higher rights of audience.

Jarleth was awarded the Lexology Who’s Who Legal 2025 Client Choice Award in the Projects and Construction category, he is the sole recipient in this category for Ireland.

2026 legal 500 EMEA

"Jarleth Heneghan and Cassandra Byrne - depth of knowledge and capacity to think outside the box.’" "Sectoral knowledge unparalleled and client base to match. Liam McCabe and Jarleth Heneghan are exceptional."

2026 Chambers Europe

"With Jarleth, we achieved the outcome we set out. He is excellent." "Jarleth Heneghan provides great service and advice."

2025 Legal 500 EMEA

"Jarleth Heneghan is always accessible, providing clear, concise advice, even in the most challenging cases." "Jarleth has provided excellent practical advice on difficult and novel projects for us. His advice and insights were central to a successful outcome and enabled us to proceed with certainty."

2025 Chambers Europe

"Jarleth Heneghan provides a high level of service, responding immediately to simple and complex queries." "He provides a very good level of service, with excellent attention to fine detail." "Jarleth is a chartered surveyor as well as a practising solicitor, which is very useful because he understands claims, costs and construction more generally." "He's not just a lawyer; he has a background in construction so he has an extra dimension to seeing risk and builds that into contracts."

2025 IFLR 1000

“Excellent client advice and leadership of the construction contract process.” “Jarleth is very responsive, seeks to understand our needs and find the best way to implement them.” “Excellent communicator with a thorough industry knowledge.” “In depth knowledge of the sector, always responsive and they provide quality work."

Practice Areas

Projects

Public Sector

Environment & Planning

Related Sectors

Construction & Engineering

Energy & Infrastructure

Related Knowledge

View All

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Article and Insights

3Jun 2026

William Fry advises RCSI Project Connect

William Fry advised RCSI on Project Connect at St Stephen’s Green, now award winning at the 2026 Irish Construction Excellence Awards

Partner

Jarleth Heneghan

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Article and Insights

19May 2026

New BER System from 24 May 2026 – what do you need to know?

Consultant

Cassandra Byrne

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Article and Insights

27Mar 2026

Jarleth Heneghan Wins Client Choice 2026 Award for Construction in Ireland

Jarleth Heneghan named exclusive 2026 Client Choice Award winner for Construction in Ireland, recognising outstanding client service for third year.

Partner

Jarleth Heneghan

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Article and Insights

23Mar 2026

Adjudication Society ROI Conference 2026: Marking a Decade of the Construction Contracts Act

William Fry LLP is pleased to host the Adjudication Society’s Republic of Ireland Conference on 14 May 2026.

Partner

Jarleth Heneghan

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News

13Mar 2026

William Fry advises AVK on Europe’s First Data Centre Microgrid

William Fry is pleased to have advised AVK on Europe's first entirely off-grid energy solution for data centres

Partner

Jarleth Heneghan

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13Jan 2026

“Smash and Grab” Adjudication Dismissed by High Court

The High Court rejects the application of "smash and grab" adjudication under the Construction Contracts Act 2013.

Chairperson

Liam McCabe

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1Dec 2025

Arbitration (Amendment) Bill 2025 supports international investment

We outline what you need to know about the Arbitration (Amendment) Bill 2025 initiated to give effect in Ireland to certain international agreement...

Consultant

Cassandra Byrne

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29Oct 2025

Changing Times: Construction Contract Updated by RIAI

RIAI launches 2025 Construction Contract, replacing 2017 forms, introducing updated standards for Irish construction projects.

Chairperson

Liam McCabe

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Article and Insights

5Sep 2025

Irish High Court Refuses to Enforce Adjudicator’s Decision

The Irish High Court recently refused to enforce an adjudicator's decision under the Construction Contracts Act 2013.

Partner

Jarleth Heneghan

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Article and Insights

3Sep 2025

William Fry LLP Wins Adjudication Enforcement Case

William Fry LLP Successfully Defends Timber Frame Projects Limited in Adjudicator’s Award Enforcement Case

Partner

Jarleth Heneghan

View All

Jarleth Heneghan

Ranking & Recommendations

Practice Areas

Related Sectors

Related Knowledge

William Fry advises RCSI Project Connect

New BER System from 24 May 2026 – what do you need to know?

Jarleth Heneghan Wins Client Choice 2026 Award for Construction in Ireland

Adjudication Society ROI Conference 2026: Marking a Decade of the Construction Contracts Act

William Fry advises AVK on Europe’s First Data Centre Microgrid

“Smash and Grab” Adjudication Dismissed by High Court

Arbitration (Amendment) Bill 2025 supports international investment

Changing Times: Construction Contract Updated by RIAI

Irish High Court Refuses to Enforce Adjudicator’s Decision

William Fry LLP Wins Adjudication Enforcement Case