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Mariusz Rumun

Call 2019

Construction & Engineering

Mariusz has experience of construction disputes in both litigation and adjudication. Many of the property damage and professional negligence claims Mariusz is instructed in also arise in the context of construction disputes.

Examples of Mariusz’s work include:

  • The Grenfell Tower Litigation: Mariusz acts, as part of a team led by Andrew Rigney KC, in respect of civil claims arising out of the Grenfell Tower Fire.
  • Successfully defending an adjudication commenced by a piling subcontractor seeking declaratory relief as to which of a series of letters of intent governed its relationship with the main contractor.
  • Representing the claimant in a claim against the D&B contractor concerning movement in made-ground and associated issues caused by defective structural fill works, which emerged following completion of the development.
  • Acting for the contractor in High Court TCC litigation concerning the construction of an extension to a domestic property, where issues have emerged concerning ground movement and cracking.
  • Acting for an architect in an adjudication concerning the design and contract administration of concrete works in the development of a new tram terminal.
  • Succeeded at trial representing a contractor seeking unpaid invoices following a repudiatory breach of contract and resisting allegations of defects. Mariusz obtained a substantial costs order on behalf of the client.
  • Acting in a claim against a subcontractor responsible for the commission and installation of plumbing in a new-build property. The claim raised issues under the Defective Premises Act 1972 as well as in negligence.
  • Defending a claim by an installer of windows and doors against a contractor concerning unpaid invoices, raising issues of defective works and abatement.

Selected Cases

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  • Lord Denning Scholarship, Lincoln’s Inn (2018)
  • BPTC Advocacy Scholarship, BPP University (2018)




  • MA in Law, University of Cambridge, Downing College
  • LLM Commercial Law (Distinction), London School of Economics and Political Science
  • BPTC, BPP Law School


  • PNBA

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