In brief
The question: When should commercial directors, main contractors, specialist subcontractors, and construction dispute solicitors choose commercial mediation over statutory adjudication under the Housing Grants, Construction and Regeneration Act 1996 for interim payment defaults, disputed Pay Less Notices, or final accounts?
The short answer: Statutory adjudication under the Housing Grants, Construction and Regeneration Act 1996 remains the primary mechanism for rapid, interim cash-flow enforcement on clear procedural defaults (“smash-and-grab” claims). Yet adjudication delivers only interim-binding decisions, leaves each party carrying strictly non-recoverable legal and expert costs under Section 108A, and routinely provokes expensive “true value” counter-adjudications. Commercial mediation is strategically superior for complex final accounts, multi-party interface claims, live project disputes where site relationships must survive, and matters carrying counterparty insolvency or enforcement stay risks under the Wimbledon v Vago principles. Mediation produces a definitive, contractually binding settlement across all underlying heads of claim without the compounding expenditure of serial tribunal battles.
Adjudication vs Mediation: Strategic Comparison
Choosing between statutory adjudication and commercial mediation is not merely a question of speed. It requires balancing enforcement immediacy against long-term cost exposure, procedural finality, and the preservation of live site operations. The matrix below outlines how both mechanisms operate under the law of England and Wales.
| Parameter | Statutory Adjudication (HGCRA 1996) | Commercial Mediation |
|---|---|---|
| Legal Basis & Right | Unilateral statutory right under Section 108; exercisable “at any time” during qualifying construction contracts. | Consensual negotiation encouraged by CPR 1.1, the Pre-Action Protocol, and judicial case management post-Churchill. |
| Timetable to Determination | 28 days from Referral Notice (extendable to 42 days by agreement or up to 14 days by the referring party). | Typically convened within 2 to 4 weeks; substantive negotiations concluded in 1 to 2 days. |
| Nature of Outcome | Imposed determination by a third-party adjudicator based strictly on legal and contractual submissions. | Mutually agreed, commercially drafted Settlement Agreement or Tomlin Order resolving all underlying issues. |
| Finality & Legal Effect | Interim-binding (“pay now, argue later”); subject to subsequent litigation, arbitration, or true value adjudication. | Final and binding; permanently extinguishes claims, valuation arguments, and defect liabilities. |
| Cost Recoverability | Strictly non-recoverable under Section 108A; each party bears its own legal, QS, and expert fees regardless of result. | Parties share mediator fees and bear their own legal costs, avoiding multi-round tribunal cost-bleed. |
| Scope of Issues | Confined strictly to the single discrete dispute defined in the Notice of Adjudication. | Holistic; can encompass variations, retentions, uncertified claims, future pipeline work, and cross-contract disputes. |
| Impact on Site Relationships | Adversarial and high-pressure; frequently polarises project delivery teams on active contracts. | Confidential, structured, and forward-looking; designed to maintain supply chain continuity and dialogue. |
| Enforcement Process | Expedited summary judgment (CPR Part 24) in the Technology and Construction Court (TCC). | Enforceable immediately as a binding contract or by entering judgment under a Tomlin Order. |
The Legal Framework: Statutory Rights and TCC Enforcement Realities
Under Section 108 of the Housing Grants, Construction and Regeneration Act 1996 (HGCRA 1996, as amended), any party to a qualifying construction contract possesses the right to refer a dispute to adjudication at any time. Standard industry forms—including JCT, NEC4, and FIDIC—incorporate these provisions directly or rely upon default mechanisms under The Scheme for Construction Contracts (England and Wales) Regulations 1998. Contracts with residential occupiers remain exempt under Section 106 unless expressly incorporated.
Statutory adjudication was conceived as an interim measure to preserve project liquidity. Sections 110A, 110B, and 111 establish a rigid payment notice regime. If a paying party fails to issue an effective Payment Notice or Pay Less Notice within the prescribed timeframe, the sum stated in the payee’s application becomes the statutory “notified sum” that must be discharged in full.
The Subjugation Principle: Smash-and-Grab vs True Value
Where a payer misses the statutory notice window, the payee can launch a “smash-and-grab” adjudication based solely on the procedural omission. The Technology and Construction Court (TCC) has defined precise boundaries governing when and how payers may challenge those figures on substantive grounds.
Following the Court of Appeal judgment in S&T (UK) Ltd v Grove Developments Ltd [2018] EWCA Civ 2448, a paying party retains the right to adjudicate the “true value” of an interim application, but that right is strictly subjugated to its immediate statutory duty to pay the notified sum first. As reaffirmed in subsequent TCC authorities such as Bexheat Ltd v Essex Services Group Ltd [2022] EWHC 936 (TCC) and Lidl Great Britain Ltd v Closed Circuit Cooling Ltd [2023] EWHC 2243 (TCC), discharging the Section 111 notified sum is a mandatory jurisdictional prerequisite before any true value adjudication can be commenced or relied upon as a set-off.
Insolvency and the Limits of Summary Enforcement
Securing an adjudicator’s decision does not guarantee cash in the bank. If a losing party fails to comply, the successful party must enforce the decision via summary judgment under CPR Part 24 in the TCC.
Where the claiming party is financially precarious, subject to a company voluntary arrangement (CVA), or in liquidation, the paying party may apply for a stay of execution based on the principles established in Wimbledon Construction Co 2000 Ltd v Derek Vago [2005] EWHC 1086 (TCC) and reinforced in John Doyle Construction Ltd v Erith Contractors Ltd [2021] EWCA Civ 1452. If the court finds that the claimant will be unable to repay the adjudicated sum should the dispute be decided differently at final trial, enforcement will be stayed. A distressed contractor can easily spend significant sums securing an adjudication decision only to face an unenforceable paper outcome.
Judicial Expectations for ADR Post-Churchill
The English courts expect parties to explore consensual dispute resolution before and during litigation. Following the Court of Appeal ruling in Churchill v Merthyr Tydfil County Borough Council [2023] EWCA Civ 1416, judges possess explicit powers to stay proceedings to facilitate alternative dispute resolution (ADR) and will penalise unreasonable refusals to engage in mediation through severe cost sanctions under CPR Part 44. Construction litigators cannot treat mediation as a perfunctory step; it represents an active case management requirement across the High Court and TCC.
The Economic Friction: Section 108A and the Serial Cost Trap
Cost recoverability remains one of the most critical commercial considerations in statutory adjudication. Commercial directors often assume that an adjudication victory brings an order for the losing party to reimburse their legal and expert expenditure. Under English construction law, that is not the case.
Section 108A of the HGCRA 1996 renders any contractual provision allocating adjudication costs between the parties void unless agreed in writing after the Notice of Adjudication is issued. Furthermore, as confirmed by Mrs Justice O’Farrell in Enviroflow Management Ltd v Redhill Works (Nottingham) Ltd [2017] EWHC (TCC), parties cannot bypass Section 108A by seeking legal representation costs under Section 5A of the Late Payment of Commercial Debts (Interest) Act 1998. In statutory adjudication, each party bears its own legal counsel, quantum expert, and claims consultant fees, regardless of the outcome.
The Mathematics of Serial Adjudication
Consider the cumulative financial exposure across a disputed £150,000 interim account:
- Round 1 (Smash-and-Grab): The subcontractor adjudicates a missed Pay Less Notice. Legal counsel and quantum consultants cost £25,000. The adjudicator awards the £150,000 notified sum. These fees are entirely non-recoverable.
- Round 2 (True Value Adjudication): The main contractor pays the £150,000 to satisfy the S&T v Grove prerequisite, then immediately launches a true value adjudication alleging defective works and critical-path delay. Both sides instruct delay analysts, quantity surveyors, and solicitors. Professional costs reach £45,000 per party. These fees are also non-recoverable.
- The Net Position: Across two rounds of adjudication, the parties incur over £140,000 in combined professional fees to resolve a £150,000 gross dispute. If the second adjudicator assesses the true value at £100,000 and orders a £50,000 repayment, both businesses have severely eroded their operating margins in unrecoverable tribunal costs.
Beyond direct financial expenditure, serial adjudication drains commercial resources. Managing consecutive 28-day statutory timetables diverts project teams, disrupts site administration, and damages working relationships across active supply chains.
Strategic Decision Framework: Adjudication vs Mediation
Deciding whether to serve a Notice of Adjudication or propose construction payment dispute mediation depends on specific legal, financial, and commercial dynamics.
When Statutory Adjudication is the Appropriate Tool
Statutory adjudication remains unmatched where non-consensual interim enforcement is required:
- Clear Procedural Defaults on Discrete Accounts: The paying party missed statutory notice deadlines without substantive defense, the payee requires urgent cash flow, and the underlying scope involves minimal complex variation or defect arguments.
- Unresponsive Counterparties: The debtor refuses to engage in commercial dialogue, stonewalls payment applications, and requires the pressure of an imposed 28-day statutory timetable.
- Supporting Statutory Suspension Rights: Obtaining a formal adjudicator’s decision to underpin the statutory right to suspend performance under Section 112 of the HGCRA 1996 without risking claims of repudiatory breach.
- Solvent, Established Paying Entities: The debtor is financially robust, eliminating the risk of an enforcement stay under Wimbledon v Vago.
When Commercial Mediation Delivers Superior Outcomes
Commercial mediation is substantially more effective across disputes involving technical complexity, counterclaims, and ongoing commercial exposure:
- Complex Final Accounts: Accounts involving hundreds of contested variations, competing delay narratives, prolongation claims, and liquidated and ascertained damages (LADs) that cannot be adequately assessed within an accelerated 28-day paper process.
- Live Project Preservation: Where works are ongoing, practical completion remains months away, and both commercial teams must collaborate daily on site.
- Multi-Party and Supply Chain Interfaces: Where delay or defect liabilities involve upstream employers, downstream specialists, or design consultants. Adjudicators cannot join third parties without tripartite consent; mediation handles multi-party structures within a single forum.
- Credit and Insolvency Sensitivities: Where enforcing an adjudication award risks precipitating counterparty insolvency or being stayed by the TCC, making a structured, consensual payment schedule far more valuable than an uncollectable judgment.
- Non-Monetary Commercial Remedies: Adjudicators can only order monetary payments or declare contractual rights. Mediators assist parties in agreeing practical commercial trades—such as exchanging collateral warranties, granting extension of time (EOT) relief without LADs, releasing retentions against defect sign-offs, or allocating future pipeline opportunities.
The Adjudication-Mediation Hybrid: The Tactical Pivot
Experienced commercial directors and construction solicitors frequently deploy adjudication and mediation in sequence rather than treating them as binary alternatives.
A contractor faced with an unpaid application and a missed Pay Less Notice can launch a Section 111 adjudication to establish clear legal leverage. Once the adjudicator orders payment of the notified sum, the contractor approaches the employer from a position of procedural strength. Rather than waiting for the employer to pay and immediately launch an expensive true value counter-adjudication, the parties use the interim award as a springboard to convene commercial mediation.
In mediation, the contractor might offer a modest commercial concession or agree to an accelerated snagging programme in exchange for a full, final, and globally binding release of all final account claims. This hybrid model leverages the enforcement power of adjudication while securing the conclusive finality and cost control of mediation.
Hypothetical Scenario: The Serial Dispute vs The Hybrid Pivot
The following scenario is a hypothetical case study illustrating practical dispute mechanics under England and Wales construction law.
A specialist Mechanical and Electrical (MEP) subcontractor submitted an interim payment application for £180,000 on a commercial development in Birmingham. The main contractor missed the contractual window for issuing a Payment Notice or Pay Less Notice. When the subcontractor issued a formal demand for the notified sum, the main contractor withheld payment, alleging £95,000 in defect remediation costs and liquidated damages for mechanical commissioning delays.
Path A: The Serial Adjudication Trap
The subcontractor launched a statutory adjudication for the £180,000 notified sum under Section 111. The adjudicator found in the subcontractor’s favour, ruling that the main contractor had failed to issue an effective Pay Less Notice, and ordered payment of £180,000 plus adjudicator’s fees.
The subcontractor incurred £28,000 in non-recoverable legal and quantum consultancy costs. Complying with the subjugation principle under S&T v Grove, the main contractor paid the £180,000 but immediately initiated a true value adjudication, instructing delay experts and building services consultants to establish defective works and critical-path delay. The subcontractor spent a further £35,000 defending the counter-adjudication.
The second adjudicator valued the works at £120,000 and awarded the main contractor £25,000 in delay damages, directing the subcontractor to repay £85,000. Between them, the parties expended over £115,000 in non-recoverable professional fees to resolve an initial £180,000 dispute, while their working relationship on site was entirely compromised.
Path B: The Strategic Hybrid Pivot
Following the first adjudicator’s decision awarding the £180,000 notified sum, the subcontractor’s legal team recognised the risk of an immediate true value counter-claim and potential TCC enforcement friction. Instead of proceeding straight to contentious enforcement, the subcontractor proposed an expedited, one-day commercial mediation.
At mediation, the parties addressed the wider commercial context. The main contractor required urgent testing and commissioning sign-off to achieve practical completion and satisfy the project funder. The subcontractor needed payment certainty and the release of historic retention balances across two separate projects.
The parties reached a comprehensive settlement on the following terms:
- The main contractor paid an agreed net sum of £152,000 within 7 business days.
- The subcontractor assigned senior commissioning engineers to a revised 10-day testing programme with structured sign-off protocols.
- The main contractor waived all outstanding liquidated damages claims for commissioning delay.
- A joint schedule of minor defects was agreed, with £15,000 in retention released immediately upon final sign-off.
- The parties executed a formal Settlement Agreement containing mutual full and final waivers across all interim and final account claims.
By pivoting to commercial mediation after establishing adjudication leverage, the parties settled their account within three weeks, maintained operational collaboration, and avoided an estimated £60,000 to £80,000 in ongoing expert and legal costs. For a broader comparison of tribunal and consensual timelines, see our detailed analysis of mediation vs litigation timelines and costs.
Preparing for Construction Mediation: Practical Steps
To maximise the effectiveness of commercial mediation in construction payment disputes, commercial teams and legal advisers should structure their preparation around practical commercial leverage:
- Consolidate the Core Quantum Evidence: Organise payment applications, default notices, variation directions, site daywork sheets, and proof of notice delivery dates into a concise core bundle.
- Assess the True Cost of Continuing Tribunal Proceedings: Calculate total exposure to unrecoverable legal and expert costs under Section 108A. Understanding this exposure provides a clear commercial baseline for settlement discussions.
- Identify Tradeable Commercial Assets: Prepare commercial solutions outside an adjudicator’s jurisdiction—such as programme re-sequencing, defect rectification schedules, staged retention releases, or inclusion on future tender lists. For further procedural context, review our guide to commercial mediation costs and frameworks in the UK.
- Secure Unrestricted Settlement Authority: Ensure decision-makers attending the mediation have full authority to execute a binding Settlement Agreement or Tomlin Order on the day, avoiding post-negotiation delay.
Frequently asked questions
What is the difference between a ‘smash-and-grab’ and a ‘true value’ adjudication?
A ‘smash-and-grab’ adjudication is founded purely on procedural default under Section 111 of the HGCRA 1996, where a paying party missed the deadline to serve an effective Payment Notice or Pay Less Notice, making the contractor’s applied sum the statutory notified sum. A ‘true value’ adjudication investigates the substantive merits of the account, evaluating actual work executed, variation valuations, defect rectifications, and delay claims.
Why are legal and expert fees strictly non-recoverable in statutory adjudication?
Section 108A of the HGCRA 1996 renders any agreement allocating adjudication costs void unless made in writing after the referral notice is given. In Enviroflow v Redhill Works, the TCC confirmed that successful parties cannot circumvent Section 108A by claiming legal costs under the Late Payment of Commercial Debts Act. Consequently, each party bears its own legal, quantum, and delay expert expenses.
Can a paying party launch a true value adjudication without paying a smash-and-grab award?
No. Under S&T (UK) Ltd v Grove Developments Ltd and subsequent TCC judgments including Bexheat v Essex Services Group, paying the Section 111 notified sum is a mandatory jurisdictional prerequisite. A paying party cannot commence or rely upon a true value adjudication until it has fully discharged the notified sum determined in the initial smash-and-grab adjudication.
When will the Technology and Construction Court refuse to enforce an adjudication decision?
The TCC enforces adjudication decisions via expedited summary judgment under CPR Part 24 in most cases. However, under the Wimbledon v Vago and John Doyle v Erith principles, the court may grant a stay of execution if the claimant is insolvent, in liquidation, or in severe financial distress and would be unable to repay the sum if the decision is overturned in subsequent litigation or arbitration.
How does commercial mediation resolve multi-party construction disputes where adjudication cannot?
Statutory adjudication is strictly bipartite; an adjudicator has no jurisdiction to join third parties—such as employers, specialist subcontractors, or design consultants—without express multi-party agreement. Commercial mediation easily accommodates multi-party structures, enabling developers, main contractors, subcontractors, and insurers to resolve complex interface liabilities in a single binding settlement.
Authoritative UK guidance and further reading
- legislation.gov.uk
- justice.gov.uk
- legislation.gov.uk
- jamsadr.com
- fenwickelliott.com
- pinsentmasons.com
- construction-legal-services.com
- clydeco.com
This guide provides general information about dispute resolution and mediation. It is not legal advice. The appropriate approach depends on the facts, documents, procedural position and the parties involved; obtain legal advice where required.