Construction Disputes

What is a construction dispute?

A construction dispute is a disagreement arising from the design, procurement, performance, valuation, payment, completion or remediation of building or engineering work. It may involve an employer, developer, main contractor, subcontractor, consultant, funder, purchaser or insurer.

Construction projects create linked obligations across several contracts, technical disciplines and stages. A disputed payment may depend on notice dates and valuation; delay may involve design information, access, variations and several competing causes; defective work may require expert investigation while the project remains operational. Those features make the dispute more than an ordinary complaint that a contract was broken.

Common examples include unpaid interim applications, pay less notice disputes, disagreements over final accounts, defective workmanship, departures from specification, extensions of time, disruption, prolongation costs, liquidated damages, disputed variations, termination and defects discovered after practical completion.

This page focuses on project and construction-contract disputes. A simple challenge to an invoice may fall under Unpaid Invoice Disputes. Wider contractual issues are considered under Business Contract Disputes. Claims that an architect, engineer or quantity surveyor fell below the required professional standard may also involve Professional Negligence, although the construction and engineering dispute framework may still apply.

The construction contract controls the project

The signed conditions are only one part of the contractual package. Drawings, specifications, schedules, bills, amendments, proposals and later instructions may determine what was required and how it should be valued.

Standard forms and amendments

JCT and NEC contracts provide structured mechanisms for payment, change, programme, delay and completion, but standard wording is frequently amended. Bespoke contracts and subcontract agreements may allocate design, ground, coordination, insurance or delay risk differently. The actual executed version and contract hierarchy should be identified rather than relying on an unamended standard form.

Scope, design and specifications

The dispute may turn on whether the contractor undertook to comply with a specification, exercise reasonable skill and care in design, achieve a stated performance outcome or coordinate the work of others. Employer's requirements, contractor's proposals, drawings, schedules of responsibility and consultant appointments can expose gaps or overlapping duties.

Instructions, variations and change control

Construction evolves. A valid variation may alter price, programme and completion obligations, but the contract usually states who may instruct change and how it must be notified and valued. Informal site requests, design development and acceleration can produce disagreement about authority, scope and entitlement if records are incomplete.

Completion and termination

Practical completion, sectional completion, defects periods, retention, final certification and termination rights have distinct consequences. A party considering suspension or termination should follow the contract and any statutory requirements carefully; a wrongful step can create a substantial counterclaim and increase project disruption.

If the contractual documents or applicable mechanism are unclear, call 0161 436 0000 before taking a formal step.

Common construction disputes

Several issues often operate together. A variation may affect valuation and delay; defective work may delay completion; payment may be withheld because the parties disagree over progress or remedial cost.

Consultant responsibility may overlap with the contractor's position. Design, inspection, certification and valuation allegations should be separated by role and duty. The cause of loss may lie with more than one participant, making contribution, insurance and contractual recourse relevant.

Construction payment disputes

Construction payment is governed by the contract and, for qualifying construction contracts, statutory requirements concerning payment and adjudication. Dates, notices and wording can be as important as valuation.

Applications, due dates and notified sums

The contract should identify the due date, final date for payment and who issues the payment notice. An application may become important where the required notice is absent or the contractual mechanism gives it that effect. The relevant documents and dates must be mapped precisely rather than treating the dispute as an ordinary unpaid invoice.

Payment and pay less notices

A payment notice or pay less notice must comply with the applicable contractual and statutory framework and be served on time. A failure may create an immediate dispute over the notified sum, even though the proper valuation of the work may be revisited through a later process. Service provisions, content and calculation all require review.

Valuation, retention and final accounts

Parties may disagree over percentage completion, measured quantities, rates, variations, loss and expense, contra-charges, defects, retention and deductions. Final accounts can consolidate years of project change, so contemporaneous instructions and valuation records are often more reliable than a reconstruction prepared after the relationship deteriorates.

Suspension for non-payment and attempts to set off alleged losses require particular care. The right may depend on notices and timing. A creditor should also distinguish recovery of the notified sum from the underlying “true value” dispute and consider the other party's solvency before selecting a remedy.

Defective work, practical completion and remediation

A defect allegation should identify the contractual requirement, observed condition, cause, consequence and reasonable remedial response.

Patent defects, latent defects and snagging

Patent defects are apparent or discoverable on reasonable inspection; latent defects are concealed and may emerge later. Snagging records minor outstanding or defective items around completion, but the label does not decide whether a serious defect prevents practical completion. The contract, nature and effect of the item matter.

Workmanship, materials and design

The alleged failure may concern workmanship, specified materials, performance, coordination or design. The applicable obligation may be strict compliance, reasonable skill and care or another contractual standard. Drawings, samples, approvals and building-control involvement do not automatically relieve the party responsible under the contract.

Inspection and expert evidence

A suitably qualified expert may inspect, test and compare the work with contractual and technical requirements. Intrusive investigation may be needed, but evidence should be recorded before remedial work changes the condition. The opposing party should ordinarily receive a reasonable opportunity to inspect where circumstances permit.

Remedial cost and loss

The reasonable solution may be repair, replacement, monitoring or a reduction in value. The claimant must mitigate loss and avoid a remedial scheme disproportionate to the contractual benefit, while the defendant cannot insist on a cheaper approach that fails to provide the promised performance. Consequential loss and business disruption require proof.

Delay, extensions of time and disruption

Finishing late does not by itself identify legal responsibility. Delay analysis asks what affected completion, when it occurred, whether it was on the critical path and how the contract allocates that event.

Programmes and critical path

Baseline and updated programmes, progress records and logic links help identify activities controlling completion. A late event that did not affect the critical path may not justify the extension claimed. Conversely, several smaller events may combine to move completion even where no single event appears decisive.

Extensions of time and notices

The contract defines relevant events, notice requirements, supporting particulars and the assessment process. Employers' changes, late access or information, adverse conditions and contractor default may have different consequences. Compliance with notices and continuing updates should be checked against the contract rather than assumed. An extension of time claim should connect the qualifying event with demonstrated delay.

Concurrent delay and the prevention principle

Concurrent delay is a specialist issue and does not simply mean that both parties caused some delay during the same general period. The relevant delay events and their effect on completion require analysis. The prevention principle and any contractual extension mechanism may become relevant where employer conduct prevents timely completion.

Liquidated damages, disruption and prolongation

Liquidated damages may provide a pre-agreed remedy for delay where the clause applies. Prolongation claims concern cost incurred because the project lasted longer; disruption concerns reduced productivity even if completion was not delayed by the same amount. Each requires contractual entitlement, causation and reliable cost evidence.

Project evidence and the dispute pathway

Construction claims are usually won or lost through contemporaneous records. The evidence should be preserved while the project team and original files remain available.

• Executed contracts, amendments and subcontracts
• Drawings, specifications and design revisions
• Programmes, updates and progress reports
• Site diaries, labour and plant records
• Instructions, requests for information and variation records
• Payment applications, certificates and notices
• Invoices, cost ledgers and final-account material
• Photographs, videos, surveys and test results
• Emails, meeting minutes and messaging records
• Completion, snagging and defect documents
• Expert reports and inspection records
• Loss, mitigation and remedial-cost evidence

Records should be organised chronologically and by issue. Native programme files and metadata may matter more than a later PDF. Parties should preserve relevant systems, avoid retrospective alteration and record any remedial work before the original condition disappears.

Methods of resolving construction disputes

The contract, urgency, project status, need for a binding decision and technical complexity determine the most suitable route.

Pre-action procedure and remedies

Construction and engineering claims generally engage the specialist Pre-Action Protocol before court proceedings, subject to its exceptions, including adjudicator enforcement and interim injunctive relief. The parties exchange proportionate information, consider ADR and normally hold a pre-action meeting. The protocol does not replace limitation periods.

Potential outcomes include payment of a notified or valued sum, damages, declarations concerning contractual rights, negotiated remedial work, release or reduction of retention, extensions of time, adjustment of the final account and settlement agreements. Injunctions or specific performance may be considered only where their legal requirements and practical suitability are met. Termination is a contractual step rather than simply a remedy awarded whenever breach occurs.

Adjudicator decisions may require prompt enforcement. Final determination through arbitration or TCC litigation can involve detailed disclosure, witness and expert evidence. The chosen route should match the issue: rapid cash-flow relief may require a different strategy from a multi-party latent-defect claim.

To compare negotiation, adjudication, mediation, arbitration and litigation for the current project, call 0161 436 0000.