Take Control of Commercial Risk: A Guide to JCT Contracts 

By

Nicholas Dunbar

Reviewed by 

Zoe Mullan

Last Updated Sep 11, 2026

By

Nicholas Dunbar

Reviewed By

Zoe Mullan

On a construction site, the standard forms published by the Joint Contracts Tribunal (JCT) often stand between a profitable project and a costly commercial dispute. Unstructured email threads and messy folder systems cannot protect your margins on their own. A properly administered contract sets the operational framework that governs every site inspection, snag list, and valuation. 

Set Legal Boundaries Before Work Begins

From the Date of Possession, a JCT contract establishes a clear legal perimeter around the project, fixing the Contract Sum, the Completion Date, and the Employer's Requirements to prevent scope creep. By adopting recognised JCT forms, both parties agree to operate within tested, established legal parameters. As a result, the contract removes emotion from the commercial process and replaces argument with defined procedure. Specifically, a standard JCT agreement allows your team to: 

• Demand proper documentation to manage a Variation, rather than rely on an unconfirmed verbal instruction or a hasty text message.
• Submit a notice for an Extension of Time (EoT) using the mechanisms the contract sets out, if the Employer delays the works.
• Require formal Pay Less Notices, rather than accept arbitrary deductions when a payment is withheld.

Match the Procurement Route to the Project

Using the wrong contract form on a complex project creates real commercial risk. Choosing the correct variant ensures the administrative load matches the scheme's financial scale and structural complexity. 

• Design and Build Contract (DB)

  Use these forms when you need single-point accountability. The main contractor takes on the design risk, giving the employer a fixed price and an agreed completion date.

• Standard Building Contract (SBC)

  Use this tier for high-value, complex traditional procurement routes. The employer retains the design team, and you carry out the works to their exact specifications.

• Minor Works (MW) or Intermediate (IC) Building Contracts

  Choose these to lower the administrative burden on simpler, lower-value schemes, where the risk profile does not justify a heavier contract type.

Keep Site Operations Aligned with Current UK Legislation

Legislation moves quickly, so site operations must keep pace. The JCT 2024 forms reflect this by embedding the Building Safety Act 2022 dutyholder regime for principal contractors directly into the contract terms. Consequently, compliance with the Building Regulations is now a fundamental contractual obligation, not a separate administrative exercise, and working in strict alignment with HSE guidance is essential throughout.

For Higher-Risk Buildings, the client must hand over compliant Golden Thread information at Gateway 3 to the Principal Accountable Person. JCT 2024 embeds the Building Safety Act's dutyholder regime for Principal Designers and Principal Contractors during design and construction, although industry commentary has noted the standard forms are largely silent on Gateway and Golden Thread specifics for Higher-Risk Buildings, so parties often still need bespoke amendments to address this risk directly. 

In addition, Article 3 of the JCT 2024 suite introduces an express duty for parties to work cooperatively, in good faith and with mutual trust, embedding a collaborative standard that was previously optional, to prevent adversarial behaviour from derailing the programme. 

Protect the Master Programme from Delay

Delays are inevitable. To legally amend the Completion Date, the main contractor must handle EoTs through precise notification of defined Relevant Events. The JCT 2024 updates account for newly categorised risks, including the discovery of asbestos, contaminated material, and unexploded ordnance, as well as delays caused by epidemics. Crucially, the JCT 2024 forms also reduce the employer's assessment window for EoT notices and particulars from 12 weeks to eight. While this shortened timeframe helps protect the integrity of Master Programme records, it also demands precision and a complete, defensible audit trail from commercial teams. 

Unify Site Data for More Predictable Outcomes

When commercial teams can quickly pull time-stamped visual evidence to support an EoT within the new eight-week window, the contract stops functioning as a defensive liability and instead becomes a tool that protects margins proactively. 

To achieve this, site teams should pin quality assurance checklists, inspection records, and time-stamped photos directly to 2D drawings or 3D models during daily site inspections. In this way, an EoT notice backed by comprehensive digital records leaves the employer little ground for dispute. 

Building this Golden Thread is difficult, however, when data sits in isolated software systems and physical ring binders. Consolidating site data into a central hub, such as Procore, turns contract administration from a reactive scramble into a controlled, proactive process. 

Written by

Nicholas Dunbar

Content Manager | Procore

78 articles

Nick Dunbar oversees the creation and management of UK and Ireland educational content at Procore. Previously, he worked as a sustainability writer at the Building Research Establishment and served as a sustainability consultant within the built environment sector. Nick holds degrees in industrial sustainability and environmental sciences and lives in Camden, London.

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Reviewed by

Zoe Mullan

27 articles

Zoe Mullan is an experienced content writer and editor with a background in marketing and communications in the e-learning sector. Zoe holds an MA in English Literature and History from the University of Glasgow and a PGDip in Journalism from the University of Strathclyde and lives in Northern Ireland.

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