In construction bidding, clarity in cost allocation can make or break both competitiveness and project profitability. Two commonly misunderstood components in a bid are sundries and provisional sums. While both may appear as “miscellaneous” or flexible allowances, they serve very different purposes, and treating them the same can lead to costly mistakes.
What Are Sundries?
Sundries refer to minor, incidental costs that are necessary to complete the works but are often too small or too numerous to itemize individually. These may include:
- Small consumables (e.g., nails, sealants, tapes)
- Minor tools or equipment usage
- Site housekeeping materials
- Temporary supports or protection works
Sundries are typically distributed within unit rates or lumped under a general item in the Bill of Quantities (BOQ). Importantly, they are fully within the contractor’s responsibility to estimate and absorb.
Key point Sundries are not adjustable: they are part of your committed price.
What Are Provisional Sums?
A provisional sum is an allowance included in the contract for work that cannot be fully defined at the time of bidding. This could be due to incomplete design, uncertain site conditions, or pending decisions.
Examples include:
- Specialist subcontract works not yet designed
- Unknown ground conditions
- Future client-driven variations
Unlike sundries, provisional sums are:
- Predefined amounts provided by the client/consultant
- Subject to remeasurement or adjustment during construction
- Often executed upon instruction
Key point Provisional sums are placeholders, not final costs.
Core Differences at a Glance
| Aspect | Sundries | Provisional Sums |
|---|---|---|
| Nature | Minor incidental costs | Allowance for undefined scope |
| Control | Contractor estimates | Client/Consultant defines |
| Adjustability | Fixed within bid | Adjustable during construction |
| Risk | Fully borne by contractor | Shared or client-driven |
| Level of Detail | Low-value, scattered | Potentially significant value |
Why This Difference Matters in Bidding
Confusing these two can distort your pricing strategy:
- Underestimating sundries can quietly erode your margins since they are not recoverable.
- Misinterpreting provisional sums as fixed scope may lead to either overpricing (losing competitiveness) or underpricing (risking losses when actual costs exceed expectations).
A disciplined bidder:
- Carefully reviews BOQ notes and specifications
- Allocates sufficient coverage for sundries within rates
- Clearly understands the conditions governing provisional sums
Packing for a Trip vs. Budgeting for Unknown Activities
Think of your construction bid like preparing for a trip.
- Sundries are like the small essentials you pack—chargers, toiletries, snacks. You don’t list every item in detail, but you know you need them, and you carry the cost yourself. If you forget them, you’ll have to buy them later at your own expense.
- Provisional sums, on the other hand, are like setting aside a budget for activities you haven’t decided on yet—maybe a guided tour or an excursion. You don’t know exactly what you’ll do, so you allocate a placeholder budget. The actual cost depends on what you eventually choose.
One is certain but small and internal, the other is uncertain and externally driven.
Practical Tips for Contractors
- For Sundries:
- Build a realistic allowance into your rates
- Review past projects to benchmark incidental costs
- Avoid ignoring “small items”—they accumulate
- For Provisional Sums:
- Understand the scope behind each allowance
- Clarify how they will be instructed and measured
- Consider impact on cash flow and program
Sundries and provisional sums may both sit quietly in your BOQ, but they play very different roles. Sundries are your responsibility, small but certain costs embedded in your price. Provisional sums are uncertain allowances, subject to change and typically controlled by the client.
Understanding this distinction helps you price smarter, manage risk better, and avoid surprises during construction.