1. Field Name and Definition

The "Materials costs" field in a NSW Cost Plus Payment Claim refers to an itemised list of all materials supplied or used in the construction work during the claim period. This includes details such as quantities, unit prices, and the total cost for each item.

This field is a fundamental component of a Cost Plus Payment Claim because it provides transparency about the exact materials that have been supplied or used in the construction work. In Cost Plus contracts, the principal (client) agrees to pay the actual costs incurred by the contractor plus an agreed margin or percentage. Consequently, detailed documentation of material costs is essential for substantiating the claimed amount.

2. Legal Requirements

Building and Construction Industry Security of Payment Act 1999 NSW

Under Section 13(2)(a) of the Act, a payment claim must "identify the construction work or related goods and services to which the payment claim relates." For materials costs, this means clearly identifying and itemising all materials supplied or used.

Consequences of Incorrect Completion

• Rejection of the payment claim by the respondent.
• Delays in payment processing.
• Potential disputes requiring adjudication.
• In severe cases, invalidation of the entire payment claim.
• Difficulty in enforcing payment through court proceedings.

3. Practical Guidance

Step-by-Step Instructions

1. Gather Documentation: Collect all invoices, delivery dockets, and receipts for materials purchased or used during the claim period.
2. Create a Comprehensive List: For each material item, include a specific description, quantity, unit price (excl. GST), total cost, GST amount, and total cost (incl. GST).
3. Organise Logically: Group similar materials together (e.g., all timber products, all plumbing materials) to make the list more readable.
4. Cross-Reference: Include reference numbers from invoices or delivery dockets to allow for easy verification.
5. Calculate Subtotals: Provide subtotals for major categories and a grand total for all materials.
6. Attach Supporting Documents: Include copies of all relevant invoices, receipts, and delivery dockets as attachments.
7. Review for Accuracy: Double-check all calculations and ensure the total materials cost is correctly transferred to the summary section.

Where to Find This Information

To complete the materials costs field accurately, refer to purchase invoices, delivery dockets, materials requisition forms, supplier statements, and site records.

4. Common Mistakes and How to Avoid Them

Typical Errors

• Insufficient Detail: Using vague descriptions like "timber" instead of "90x45mm MGP10 Pine Framing Timber".
• Missing Quantities or Units: Listing materials without specifying quantities or using inconsistent units.
• Lack of Supporting Documentation: Failing to attach invoices or receipts to substantiate the costs claimed.
• Mathematical Errors: Incorrect calculations in quantity extensions or total summations.
• Double Claiming: Inadvertently including materials that were claimed in previous payment claims.

Best Practices

Maintain thorough records, perform regular reconciliations, use technology like construction management software to track materials, standardise descriptions, and always have a second person review the claim before submission.

5. Risks of Not Including This Information

Inadequate documentation of material costs can lead to significant legal, financial, and dispute-related risks, undermining your claim's validity and your financial stability.

6. Examples

MATERIALS COSTS (Reference Period: 1 Aug 2025 - 31 Aug 2025)

TIMBER AND FRAMING
1. 90x45mm MGP10 Pine Framing Timber (Invoice #T12345)
   Quantity: 120 linear metres
   Unit Price: $8.50/m (excl. GST)
   Total: $1,020.00 (excl. GST)
   GST: $102.00
   Total (incl. GST): $1,122.00

PLASTERBOARD AND LININGS
2. 13mm Standard Gyprock Plasterboard (Invoice #P56789)
   Quantity: 40 sheets
   Unit Price: $28.50/sheet (excl. GST)
   Total: $1,140.00 (excl. GST)
   GST: $114.00
   Total (incl. GST): $1,254.00

SUMMARY
Total Materials Cost (excl. GST): $14,720.00
Total GST: $1,472.00
Total Materials Cost (incl. GST): $16,192.00

7. Related Fields

The accuracy of the Materials Costs section directly impacts other key areas of your payment claim.

• Labour Costs: Ensure consistency between materials claimed and the labour required to install them.
• Subcontractor Costs: If subcontractors supply materials, ensure these are not double-counted in both sections.
• Variations: Materials related to variation works should be clearly identified and cross-referenced to the relevant approval.
• Builder's Margin: The margin is typically applied to the total of materials, labour, and subcontractor costs. Ensure the materials costs are correctly included in this calculation.

8. Frequently Asked Questions