JCT Clause 4 Amendments: Spotting Extended Payment Terms Before You Sign

The Reality of JCT Clause 4: Standard Terms vs Reality

In an unamended JCT Design and Build Subcontract (DBSub/A), the payment mechanism is predictable. Under Clauses 4.9 and 4.10:

• Interim payments operate on a regular monthly valuation cycle.
• The due date is fixed based on the agreed Subcontract Timetable.
• The final date for payment falls exactly 14 days after the due date.

However, main contractors rarely leave this standard drafting intact. Through bespoke Schedules of Amendments, Clause 4 is routinely rewritten to tilt financial risk entirely onto your shoulders.

The Three Red-Flag Amendments to Watch Out For

1. Extended Payment Terms (60 to 90-Day Cycles)

Main contractors frequently strike out the 14-day window and replace it with 60 or even 90 days from the due date. On a major package, this forces you to finance payroll, plant hire, and supplier invoices for three full months before receiving a single penny of cash flow.

2. “Condition Precedent” Application Traps

An increasingly common amendment is the condition precedent clause. This states that an interim payment application will only be considered valid if accompanied by specific substantiation—such as signed daily allocation sheets, waste transfer notes, or photographic evidence—submitted before a rigid monthly cut-off date.

If you miss a single sheet, the contractor’s commercial team can legally reject the entire application, leaving you with zero valuation for that cycle.

3. Compressed Pay Less Notice Windows

The standard contract requires the contractor to issue a Pay Less Notice at least 5 days before the final date for payment. Schedules of amendments often slash this to 1 or 2 days. This gives the contractor maximum time to issue last-minute deductions, leaving you almost no time to react before cash is withheld.

The Financial Risk of Signing Without Review

If you sign an amended Clause 4, you are contractually bound by its terms. You cannot later argue that 60-day terms are “unfair.”

More dangerously, if cash dries up and you stop working, you lose your statutory protection under Section 112 of the Construction Act. Because the extended payment date has not arrived, the contractor is not in default—meaning you are the party in breach and face severe claims for delay and Liquidated and Ascertained Damages (LADs).

Check Your Draft Terms in Minutes

Never accept heavy amendments without qualifying them first. Before you sign and return your subcontract order, run it through my automated commercial scanner to pinpoint amended payment clauses, extended terms, and hidden liability traps.