Provisional sums are a common yet often misunderstood component of construction contracts. Their correct management is essential for the smooth operation and financial health of any construction project. This blog aims to demystify provisional sums, with particular reference to how they are dealt with in popular UK construction contracts such as JCT (Joint Contracts Tribunal) and NEC (New Engineering Contract). We’ll also explore how provisional sums are addressed in final accounts and the differences between defined and undefined provisional sums.

What Are Provisional Sums?

Provisional sums are allowances included in the contract sum to cover work or services that are anticipated but not yet fully defined at the time of contract signing. They provide flexibility in the contract to manage unknowns without requiring significant contract amendments. Essentially, they act as placeholders for future work or costs that are uncertain in scope or price at the project’s outset.

Provisional sums are often categorized into two types:

• Defined Provisional Sums: These are sums set aside for work that is outlined in the contract documents but lacks detail in terms of scope, specifications, or quantity.
• Undefined Provisional Sums: These are sums included for work or services that are entirely undefined, lacking any specific details within the contract documents.

Provisional Sums in JCT Contracts

The JCT suite of contracts is widely used in the UK construction industry. Provisional sums in JCT contracts are treated with specific protocols to ensure clarity and fairness.

• Inclusion in Contract Sum: Provisional sums are included in the contract sum, but they are distinct from the works covered by detailed specifications and drawings.
• Instruction Requirement: The use of a provisional sum requires an instruction from the contract administrator or employer’s agent. This ensures that any work covered by a provisional sum is formally authorized before it commences.
• Adjustment of Contract Sum: Once the provisional sum work is instructed and completed, the contract sum is adjusted to reflect the actual cost of the work. This is usually based on agreed rates or a fair valuation if no rates are pre-agreed.

Provisional Sums in NEC Contracts

NEC contracts, known for their emphasis on collaboration and flexibility, handle provisional sums differently compared to JCT contracts.

• Z Clauses: NEC contracts do not explicitly refer to provisional sums in their core clauses. However, parties can introduce provisional sums via Z clauses, which are amendments to the standard NEC conditions.
• Early Warning and Risk Management: In NEC contracts, the emphasis is on early warning and proactive risk management. Any potential work that might be covered by a provisional sum should ideally be identified and managed through the early warning process and risk register.
• Compensation Events: The work covered by provisional sums, once instructed, can be treated as compensation events, leading to adjustments in the contract price and programme.

Handling Provisional Sums in Final Accounts

Final accounts mark the reconciliation of the project’s financials at the end of the construction phase. The handling of provisional sums during this stage is crucial for ensuring that all parties are compensated fairly and accurately.

• Reconciliation: The provisional sums are reconciled against the actual costs incurred. For defined provisional sums, the reconciliation is straightforward as the work was anticipated, and only the actual cost needs to be confirmed.
• Valuation: For undefined provisional sums, the valuation can be more complex. The actual work done must be fully measured, and a fair rate agreed upon if not pre-determined. This can lead to negotiations or disputes if not managed transparently.
• Documentation: Detailed records and documentation are essential to support the claims associated with provisional sums. This includes all instructions, works orders, and variations agreed upon during the project.

Defined vs. Undefined Provisional Sums

The distinction between defined and undefined provisional sums is critical for contract management and financial control.

• Defined Provisional Sums: These sums are for work that is known to be required but lacks full detail. For example, a sum might be set aside for additional landscaping where the exact planting scheme is not yet decided. The contract documents will outline the nature of the work but leave details to be confirmed later.
• Undefined Provisional Sums: These sums are for work that is entirely unspecified at the contract stage. This might include unforeseen site remediation works where the nature and extent of contamination are unknown at the time of signing the contract. Undefined provisional sums carry higher risks due to the greater uncertainty involved.

Conclusion

Provisional sums are an essential element in construction contracts, providing flexibility to manage uncertainties. However, their correct handling requires clear instructions, detailed documentation, and careful financial management. By understanding how provisional sums are managed in different contract forms like JCT and NEC, and knowing the differences between defined and undefined provisional sums, construction businesses can better navigate the complexities of contract administration and ensure fair outcomes in their projects.

For UK-based construction businesses, mastering the intricacies of provisional sums can lead to more effective project management, reduced risks, and better financial outcomes. If you need further assistance or bespoke advice on managing provisional sums in your projects, our consultancy is here to help. Contact us for expert guidance tailored to your specific needs.