“Battle of forms” is a common contractual issue in construction procurement where two parties attempt to contract on their own differing terms and conditions. It frequently arises between Main Contractors and Subcontractors during tender negotiations.
In simple terms, both parties are effectively saying:
- “We will work with you, but only on our terms.”
- The dispute then becomes:
- Which terms actually govern the contract?
- Was a contract formally agreed at all?
- Which document was accepted last?
How It Typically Happens
A typical scenario may look like this:
- A Subcontractor submits a quotation with its own T&Cs attached.
- The Main Contractor issues a purchase order or subcontract with their terms.
- The Subcontractor begins work but sends an acknowledgement referring back to its original quotation.
- Work proceeds without either side fully resolving the contractual position.
By the time a dispute occurs, neither party may agree on:
- liability caps;
- payment provisions;
- programme obligations;
- fitness for purpose obligations; or
- dispute resolution mechanisms.
Why It Matters
The contractual differences between parties can be significant and commercially dangerous.
Examples include:
- one party limiting liability whilst the other leaves liability uncapped;
- differing payment periods;
- conflicting insurance obligations;
- varying defect liability periods;
- one party attempting to flow down onerous upstream contract risks.
And the issue often only becomes visible once:
- a payment dispute arises;
- defects occur;
- delays impact the programme; or
- legal proceedings commence.
At that point, determining which terms apply can become complex and expensive.
How Courts Often Assess It
Traditionally, courts have applied the “last shot” principle.
This means:
- the last set of terms issued before work commenced may be considered accepted through conduct.
For example:
- if a Contractor issues a subcontract order;
- the Subcontractor proceeds with the works without objection;
- the Contractor’s terms may prevail.
Common Construction Examples
Battle of forms disputes commonly occur with:
- purchase orders;
- framework call-offs;
- subcontract quotations;
- consultant appointments;
- supplier agreements; and
- amended standard forms such as JCT Design and Build Contract 2024 or NEC4 Engineering and Construction Contract flow-down amendments.
Good Commercial Practice
To reduce risk:
- ensure contracts are formally executed before works commence;
- clearly reject unacceptable terms in writing;
- avoid commencing work “subject to contract” for extended periods;
- maintain clear procurement records; and
- ensure purchase orders and subcontract documents align.
From a QS and commercial management perspective, early contractual clarity is often far cheaper than resolving a dispute later.
