CONSTRUCTION
CLAIMS EXPERTS

We Deliver Results on Forensic Claims

About Us - 53 Quantum

We are a leading construction claims and construction business intelligence solutions provider, with a proven track record in adjudication, arbitration and litigation in London and across the UK. We are here to assist you when you need us.

Our Business 53Quantum was founded in 2004 to provide efficient and detailed cost analysis services to clients in the engineering and construction industries, involved in claim disputes.

With a proven track record in adjudication, arbitration and litigation, in London and across the UK; 53Quantum’s services are now sought by a myriad of clients, from business owners, commercial directors/managers to those in the legal sector, looking for assistance with a claim.

In recent years, 53Quantum has sought to build on its more traditional offering by utilising new, cutting-edge technology, which not only allows the capture and analysis of relevant data in the defence of a claim but more importantly empowers a client to future-proof its business.

With the right analytical tools, employed from the outset, the team at 53Quantum strongly believe that many of the reoccurring issues arising on projects can be avoided. This increasing focus on the delivery of state-of-the-art Business Intelligence and visualisation software to our clients is what we call QUA.

How can we help with your construction project?

We provide specialist expert services and data-driven analysis to help you resolve construction disputes and deliver successful outcomes.

Quantum & Delay

Expert analysis of delay, disruption and quantum claims. We identify critical path impacts, assess liability and quantify entitlement with clarity and precision.

Delay and disruption analysis
Quantum assessment and entitlement
CPM programming and schedule analysis

Construction Data Analysis

Transform project data into clear, defensible insights. We analyse records, costs and programmes to support decision making, negotiation and expert reporting.

Document and data review
Forensic data analysis
Expert reports and visualisation

Expert. Independent. Defensible.

Justin Fellows

Director, 53 Quantum | Quantum Expert

Justin Fellows is a leading Quantum Expert and dispute resolution specialist with a 40-year career in the construction industry, underpinned by 25 years of post-chartered expertise.

His extensive portfolio spans the construction, infrastructure, rail, M&E, power, nuclear, and utilities sectors. As Director of 53 Quantum, Justin provides strategic counsel to main contractors, specialist subcontractors, employers, and legal teams, navigating issues that range from localised UK construction matters to highly complex international disputes with values exceeding £1 billion.

Uniquely positioned through his hands-on origins, Justin began his career in 1986 as an apprentice bricklayer, earning City & Guilds craft qualifications. This grounded, on-site foundation informs his technical command today. Building his career from the ground up, he advanced to a trainee mechanical quantity surveyor on fire-prevention systems before contributing to landmark infrastructure projects, including the Jubilee Line Extension. His professional development was further shaped by invaluable mentorship working under the direction of the eminent quantum expert at Davis Langdon in 2009.

Today, Justin is widely recognised for his authoritative command of complex cost analysis, cost engineering, contract administration, loss and expense evaluations, and forensic cost auditing. He possesses deep practical experience across all major contract forms, including NEC, JCT, FIDIC, ICE, and Network Rail contracts, alongside bespoke commercial arrangements. A pioneer in integrating modern business intelligence and auditable automated data processes into dispute resolution, Justin has spent over a decade refining techniques in big-data manipulation, advanced financial modelling, and specialised data visualisation. This cutting-edge expertise enables him to distil multi-layered, often convoluted cost data into clear, objective insights capable of withstanding intense scrutiny and cross-examination in formal proceedings. His substantial dispute experience encompasses Adjudication, Arbitration, and Litigation. Justin frequently acts as an independent quantum assessor, manages high-volume adjudication proceedings for subcontractors, and serves as a Quantum Expert on high-stakes disputes involving major stadium developments, nuclear facilities, oil and gas plants, waste-to-energy assets, and large-scale commercial and residential projects. Justin holds a Postgraduate Diploma in Construction Law and Arbitration from King’s College London. He is a Chartered Builder (MCIOB) and a Member of the Chartered Institute of Arbitrators (MCIArb). Dedicated to advancing the profession, Justin was appointed Part-Time Lecturer in Forensic Quantum Analysis at the College of Contract Management in 2025. His published research on adjudicators’ jurisdiction is held in the King’s College Centre of Construction Law Library. Ultimately, Justin is valued for his unique synthesis of traditional quantity surveying, contractual expertise, and forensic data analysis, which establishes him as a highly trusted adviser in commercial management and high-value contentious matters.

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Our Standards

Professional Memberships

MCIOB Chartered Builder

Member of the Chartered Institute of Building with chartered status.

MCIArb Member of the Chartered Institute of Arbitrators

Member with a commitment to the highest standards of professional conduct.

Martin Bomoi-Obita

Head of Claims | Expert Planner & Delay Analyst, 53 Quantum

Martin Bomoi-Obita is a highly respected planning, delay analysis, and dispute resolution specialist with over 25 years of experience across the construction, infrastructure, engineering, power, rail, utilities, aviation, healthcare, and process industries. He has advised clients throughout the United Kingdom and internationally on complex project controls, claims management, forensic scheduling, and dispute avoidance strategies.

As a senior leader at 53 Quantum, Martin combines extensive technical expertise with commercial insight to help clients successfully navigate project challenges, recover distressed programmes, and resolve high-value disputes. His experience spans the complete project lifecycle, from pre-construction planning and programme development through to final account negotiations and expert dispute support.

Martin is recognised for his specialist knowledge in time management, delay and disruption analysis, earned value management, risk assessment, change management, and contract administration. He has worked under a wide range of contract forms, including NEC, FIDIC, JCT, ICE, IChemE, Network Rail contracts, and bespoke commercial arrangements.

His dispute resolution experience is particularly significant. Martin has acted as an Expert Witness in Litigations, Adjudication proceedings, served as a Single Joint Expert on matters to support Management Discussions, and supported numerous Expert Witness in arbitration and litigation matters involving extension of time, delay, disruption, and productivity claims. His expertise has been applied on disputes ranging from major infrastructure works and railway projects to power generation facilities, mix-use buildings and international process plants for oil, gas or materials.Throughout his career, Martin has delivered planning, claims, and expert services on some of the world’s most complex projects, including the London 2012 Olympic developments, Crossrail Paddington Station, Great Eastern Main Line Electrification, Heathrow Terminal 2, major power stations, infrastructure projects, and international transportation and processing facilities.

A qualified Civil Engineer holding a BEng and an Advanced Diploma in Civil Engineering, Martin is also undertaking legal studies with a focus on arbitration to further strengthen the support he provides to clients involved in dispute resolution. He is a member of the Association for Project Management (APM) and the Society of Construction Law (SCL).

Martin is valued for his ability to clearly communicate complex technical issues, lead multidisciplinary teams, and provide robust, evidence-based opinions that assist clients in achieving commercially sound outcomes. His combination of planning expertise, contractual knowledge, and dispute experience makes him a trusted adviser on both project delivery and contentious matters.

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Professional Memberships

OUR STANDARDS

Professional Memberships

Our professional memberships reflect our commitment to technical excellence, independence and the highest standards of professional conduct.

MAPM Member of the Association for Project Management

Member of the Association for Project Management, demonstrating a commitment to professional standards, best practice and ongoing development in project and programme management.

MSCL Member of the Society of Construction Law

Member of the Society of Construction Law, supporting the advancement of construction law and the highest standards of professional conduct in the construction industry.

Our Commitment

Our memberships and qualifications reflect our commitment to professionalism, continuous development and the highest standards of service for our clients.

Corporate
Responsibility

We are choosing to support Homeless Oxfordshire because they, like many in the construction industry, also build homes, just not with physical bricks and mortar! Through the combination of guidance and the provision of a wide range of different types of accommodation, Homeless Oxfordshire enables people to learn how to manage a tenancy, have improved self-esteem and a more positive self-identity and gain the skills that will allow them to move on. Ultimately living and succeeding with greater independence.

Interested in getting involved too? Why not join the Homeless Oxfordshire book club. By joining, you can help someone to start a new chapter in their life. Reading has many benefits for us all; escaping our reality for a little time improves mental health and well-being. By joining, you can help someone to start a new chapter in their life (and all for less than the price of a coffee and a croissant!)

Justin would love to hear from you. Schedule a free consultation call with us to learn how our data analysis and claims services can help you gain insights, support claims and get the most from your construction data.

Schedule your free consultation call.

Quantum

Quantify
with confidence

Delay

Clarity in
Complexity

Data

Construction Services

CONSTRUCTION
CLAIMS EXPERTS

About Us - 53 Quantum