A dispute over a final account, a defects list or an extension of time claim doesn't have to end in a 28-day adjudication battle or a year in the Technology and Construction Court. Mediation in construction disputes offers a third route - a voluntary, confidential process in which an independent mediator helps both sides negotiate their own settlement, rather than imposing one on them.

For quantity surveyors and commercial managers, understanding when mediation fits alongside adjudication and arbitration is now a core part of managing risk on a live project. The pre-action protocol for construction and engineering disputes in England and Wales expects parties to consider some form of alternative dispute resolution before litigation starts, and many JCT and NEC contracts point towards mediation as a first step when direct negotiation stalls.

This guide sets out what mediation actually involves, how the process runs from the mediation agreement through to a settlement, and how it stacks up against adjudication and arbitration on cost, speed and finality. It also covers when mediation is the right call on a construction dispute - and when it isn't.

Whether you're weighing up a live payment dispute, drafting a dispute resolution clause, or simply want to understand your options before a disagreement escalates, read on for a practical breakdown of construction mediation in the UK.

Quick Answer

Mediation is a voluntary, confidential process in which an independent mediator helps both parties to a construction dispute negotiate their own settlement. Unlike adjudication or arbitration, the mediator has no power to impose a decision - the outcome depends entirely on the parties reaching agreement. Mediation suits disputes where a commercial relationship is worth preserving, where the issues are more about interpretation or communication than a straightforward contractual entitlement, and where both sides want a quick, private, cost-effective resolution. It is less suited to disputes needing an urgent cash-flow decision (where adjudication is faster) or where a binding legal precedent or final determination is required (where arbitration or litigation is more appropriate).

What Is Mediation in a Construction Context?

A facilitated negotiation, not a judgment

Mediation is a form of alternative dispute resolution (ADR) in which a neutral, independent mediator helps two or more parties work towards a settlement. The mediator does not decide who is right and has no authority to impose an outcome. Their role is to manage the process, test each side's position, and help identify a deal both parties can live with.

This makes mediation fundamentally different from adjudication, arbitration or litigation, all of which end with someone else deciding the outcome. If neither side agrees to a proposed settlement, there is no result, and the parties simply retain whatever rights they had before mediation began.

Voluntary, confidential and without prejudice

Three features define construction mediation in the UK. It is voluntary - a court cannot force a settlement, though it increasingly expects parties to attempt ADR before trial. It is confidential - what is said in mediation cannot usually be referred to later in adjudication or court proceedings. And it is without prejudice, meaning parties can explore compromise freely without those concessions being used against them later.

  • Voluntary: either party can walk away at any point, and the mediator cannot compel a settlement
  • Confidential: discussions and documents produced for the mediation are protected from later disclosure
  • Without prejudice: offers and concessions made during mediation cannot be used as admissions later
  • Flexible: the parties largely control the format, timetable and even the definition of a successful outcome
  • Non-binding until signed: only a written settlement agreement, once executed, becomes a binding contract
Close-up of two hands signing a settlement agreement document at a mediation meeting

How Mediation Differs From Adjudication, Arbitration and Litigation

Quantity surveyors and commercial managers usually meet mediation alongside three other routes to resolving a construction dispute: adjudication, arbitration and litigation. Each sits at a different point on the spectrum of speed, cost, formality and finality, and the comparison below sets out how mediation stacks up against the two most common contractual routes.

Table 01 / Legal & Disputes

How mediation compares with adjudication and arbitration on a construction dispute

FeatureMediationAdjudication
Decision-makerOnly the parties themselves - the mediator cannot impose an outcomeAn independent adjudicator decides the dispute
Typical timescaleUsually a single day, occasionally two for complex disputes28 days from referral, extendable by 14 days
Outcome statusNon-binding unless a settlement agreement is signedBinding on an interim basis - "pay now, argue later"
ConfidentialityFully confidential and without prejudice throughoutPrivate process, though enforcement in court is public
Relationship impactDesigned to preserve the working relationshipOften adversarial; can strain an ongoing relationship
Typical costMediator's day fee, usually shared between the partiesLower cost than arbitration; costs not usually recoverable

Source: Housing Grants, Construction and Regeneration Act 1996, s.108; CEDR Model Mediation Procedure.

The distinction to hold onto is control of outcome. Adjudication and arbitration both end with a decision imposed by a third party - fast in adjudication's case, final and binding in arbitration's. Mediation only produces an outcome the parties agree to themselves, which is why it tends to preserve working relationships that adversarial routes can damage.

A commercial manager comparing dispute resolution options on a laptop in a site office

The Construction Mediation Process, Step by Step

Agreeing to mediate and appointing a mediator

Mediation begins when both parties agree to attempt it - sometimes because a contract clause specifies it, sometimes because one party proposes it under the pre-action protocol. The parties then jointly select a mediator, often from a panel such as CEDR or the Construction Industry Council, and sign a mediation agreement setting out confidentiality, fees, and the mediator's authority.

Position statements and preparation

Each side prepares a position statement - a concise summary of the dispute, key facts and desired outcome - along with a bundle of core supporting documents. Unlike a witness statement for litigation, this is written to persuade the mediator and open a negotiation. Statements are usually exchanged a few days before the mediation session.

The mediation day: joint and private sessions

The mediator typically opens with a joint session where each side sets out its position, before moving into private sessions (caucuses) with each party in turn. The mediator shuttles between rooms, testing arguments and exploring settlement figures. Most construction mediations are scheduled for a single day, though complex, multi-party disputes can run over two.

Settlement and close

If the parties reach agreement, it is written up and signed on the day as a binding settlement agreement, converting a non-binding negotiation into an enforceable contract. If no agreement is reached, the mediation simply ends without prejudice to either party's other rights, and both remain free to pursue adjudication, arbitration or litigation as before. Settlement rates for construction mediations are consistently high.

Two construction industry professionals in a private discussion during a mediation session

When Mediation Suits a Construction Dispute

Mediation is best suited to disputes where the commercial relationship still has value, where the issues involve several overlapping claims, or where both sides want a resolution but have got stuck negotiating directly. It works well for final account disagreements, defects disputes, professional negligence claims, and multi-party disputes involving several subcontractors or consultants, where one binding adjudicator's decision would be hard to apply fairly across everyone.

  • An ongoing framework or repeat-business relationship is worth preserving
  • The dispute involves several parties whose positions don't fit neatly into a single adjudication
  • Both sides want privacy and are willing to negotiate rather than fight to a final decision
  • Direct negotiation has stalled, but neither side wants the cost and delay of arbitration or litigation
  • The contract, or the pre-action protocol, expects ADR to be attempted before proceedings

Mediation also works as a pressure valve in a long-running dispute. Bringing an experienced mediator into a stalled negotiation often unlocks movement two entrenched project teams cannot manage alone, because the mediator can test each side's real bottom line in private without either party losing face.

When Mediation Is the Wrong Tool

Cash-flow disputes need speed, not negotiation

Where a contractor or subcontractor needs an unpaid interim payment resolved quickly to protect cash flow, adjudication is almost always the better route. Its 28-day statutory timetable exists precisely to keep money moving on a live project - mediation's flexible, unhurried format works against that urgency.

One party won't engage in good faith

Mediation depends on both sides negotiating honestly. If one party is using the dispute tactically - to delay payment, or to avoid engaging at all - a process with no power to compel disclosure or impose a decision can waste time and cost. A route producing a binding outcome regardless of cooperation, such as adjudication or arbitration, is more effective here.

A legal precedent or final determination is needed

Where the objective is a final, binding ruling on a point of contract interpretation - for example, settling how a clause should be read across a wider programme of works - arbitration or litigation are the appropriate routes, since mediation's outcome is only binding if both sides choose to sign a settlement.

A quantity surveyor reviewing a cash flow forecast and payment schedule on site

Choosing a Construction Mediator

The mediator's credibility with both sides is what makes the process work, so selection matters. Most construction mediations use a mediator accredited by a recognised body such as CEDR or CIArb, with specific experience in construction disputes - someone who understands NEC and JCT mechanics without needing a tutorial from the parties' lawyers.

  • Look for accreditation from CEDR, CIArb or a comparable recognised mediation body
  • Prioritise sector-specific experience - construction, engineering or infrastructure disputes specifically
  • Check availability against the parties' preferred timetable, since delay reduces mediation's main advantage
  • Consider whether a legally qualified mediator or a construction professional mediator better fits the dispute
  • Agree the mediator jointly - a mediator proposed unilaterally can undermine the other side's confidence in the process

Many construction mediations use the CEDR Model Mediation Procedure or Model Project Mediation Protocol, widely referenced in dispute resolution clauses because they set out an agreed, tested framework for appointment, confidentiality and settlement, reducing procedural argument before the substantive dispute is addressed.

Cost and Time: Mediation Compared

One of mediation's strongest selling points is how little it costs relative to the value it protects. A typical construction mediation involves a single mediator's day fee, a venue (or none, if run remotely), and each party's own preparation time - a fraction of the cost of a multi-day arbitration hearing or a Technology and Construction Court trial.

Graphic 02 / Legal & Disputes

Relative cost of resolving a construction dispute by route

Mediation - single mediator's day fee, split between partiesLowest
£
Adjudication - adjudicator's fee, limited preparation costsLow-moderate
££
Arbitration - tribunal fees, venue, expert and legal costsHigh
£££
Litigation - court fees, disclosure, expert and trial costsHighest
££££
Mediation's low cost relative to arbitration and litigation is one of its biggest draws - most disputes settle for the price of a single mediator's day fee.

Source: SYSTECH, Mediation in Construction Disputes: Advantages and Disadvantages.

The time saving is just as significant. Most construction mediations conclude within a single day - compared with the weeks adjudication takes to run its statutory course, or the months to years arbitration and litigation can require once directions, disclosure and hearing time are factored in. For a project team closing out accounts, that speed has value of its own.

A construction project team reviewing dispute costs and timelines around a table

Frequently Asked Questions

Is mediation legally binding in construction disputes?

Not until a settlement is reached and signed. The mediation process itself is non-binding - either party can walk away without agreeing to anything. Once both sides sign a written settlement agreement at the end of a successful mediation, it becomes a binding and enforceable contract in the normal way.

How long does construction mediation take?

Most construction mediations are scheduled for a single day, though complex or multi-party disputes can run over two days. This compares with 28 days for adjudication and typically many months for arbitration or litigation.

Can you mediate and adjudicate at the same time?

Yes. Mediation does not remove a party's statutory right to adjudicate a construction dispute at any time. Parties sometimes run mediation alongside, or shortly before or after, an adjudication referral, particularly on multi-issue disputes where only some elements are suited to mediation.

Who pays for construction mediation?

Typically the parties split the mediator's fee and venue costs equally, though this is agreed in the mediation agreement and can be varied. Each party bears its own legal and preparation costs regardless of the outcome, unlike litigation where costs can follow the result.

What happens if mediation fails to reach a settlement?

If no agreement is reached, the mediation simply ends. Nothing said during the process can be used against either party later, and both sides retain their full rights to pursue adjudication, arbitration or litigation as if the mediation had not happened.

Do JCT and NEC contracts require mediation before adjudication?

Most JCT and NEC contracts encourage or reference mediation and other ADR methods, but neither removes a party's statutory right to adjudicate at any time under the Housing Grants, Construction and Regeneration Act 1996. Whether mediation is a mandatory first step depends on the specific dispute resolution clause in the contract.

How much does a construction mediator cost?

Mediator fees vary by experience and the value of the dispute, but a typical day rate for an accredited construction mediator ranges from roughly £1,500 to £5,000 or more, usually split between the parties - still substantially less than the cost of preparing for and running an arbitration hearing or court trial.

Final Thoughts

Mediation won't resolve every construction dispute, and it isn't designed to. It works best as a deliberate choice - made when both sides genuinely want to settle, when a relationship is worth protecting, or when a stalled negotiation needs an independent hand to move it forward. Understanding where it sits alongside adjudication and arbitration means a QS or commercial manager can recommend the right route at the right time, rather than defaulting to whichever process a contract happens to mention first.

The lower cost, shorter timescale and preserved confidentiality make mediation worth considering early in almost any dispute, even where the parties ultimately end up in adjudication or arbitration anyway. At worst, it costs a day and a modest fee; at best, it closes out a dispute in a fraction of the time and expense of the alternatives.

Want the full picture? Want the full picture on construction dispute resolution?

Read our guides to Construction Adjudication Explained, Arbitration in Construction: When to Use It and How, and Construction Dispute Resolution: Options for QSs and CMs to see how mediation fits alongside the other routes available on a live dispute.