UK procurement: contract changes and transparency Q&A

Question 1

Can a buyer and supplier agree any change after a public contract has been awarded?

Accepted Answer

No. Commercial agreement between the parties does not by itself make a modification permissible under procurement law.

Under the Act, relevant public and convertible contracts need a permitted modification ground unless a specific exception applies.

The contract’s own change-control requirements also matter.

Before committing resources or changing price, identify the proposed change, legal basis, approvals and any notice obligations.

If no permitted ground applies, a new procurement may be needed.

Question 2

Do Procurement Act modification rules govern all contracts currently being delivered?

Accepted Answer

No. Legacy contracts preserved under the transitional arrangements continue to use the previous legislation for management, including modifications.

A contract procured under the Public Contracts Regulations 2015 may therefore require analysis under regulation 72 rather than the Act.

Record the original regime and any framework history before assessing a change.

The fact that the change is being made in 2026 does not automatically make the new Act the governing modification law.

Question 3

Does a change clause in the original contract guarantee that any proposed variation is allowed?

Accepted Answer

No. A contractual mechanism is relevant, but the procurement-law ground and its conditions still need to be satisfied.

The guidance identifies modifications provided for in the contract as one possible route, alongside other grounds.

Read the scope and clarity of the original provision and compare it with the actual change.

An expansive label such as change control should not be treated as unlimited permission to replace the original commercial bargain.

Question 4

Is every modification below ten per cent automatically lawful?

Accepted Answer

No. The Act has several distinct modification tests, and a percentage mentioned in one test should not be turned into a universal safe harbour.

For example, the non-substantial test addresses changes to term, scope and economic balance.

Other grounds have their own conditions and limits.

Identify the applicable provision and calculate the relevant values correctly.

If the change materially alters what was competed, a small-looking percentage alone may not answer the legal question.

Question 5

What is a convertible contract in the modification guidance?

Accepted Answer

It is a concept addressing a contract that was below threshold but may become a public contract through modification, subject to the statutory definition and rules.

The concept prevents a supplier or buyer from assuming that the original low value permanently removes procurement constraints.

Track the original estimated value, cumulative changes and the proposed revised obligation.

Seek a specific assessment before a significant expansion rather than deciding solely from the procurement route used at the outset.

Question 6

Do light touch contracts use every ordinary modification ground in the same way?

Accepted Answer

No. The guidance explains that light touch contracts have different treatment and do not need to justify modifications using the ordinary ten-ground structure.

That does not remove the contract’s terms, transparency duties or every other legal requirement.

Confirm the contract is actually a light touch contract and review the applicable notice and publication provisions.

The label should not be applied retrospectively merely because the parties would prefer a more flexible change process.

Question 7

What is the purpose of a contract change notice?

Accepted Answer

It provides transparency about a relevant change to a public contract, including information that helps the market understand what has been modified and why.

Not every change has identical publication requirements, and exceptions need checking.

A supplier should anticipate that material contract information may become public and keep its explanation consistent with the approved change record.

Publication is a legal step in the process, not a substitute for establishing that the modification itself is permitted.

Question 8

Can a supplier mark the entire contract confidential to prevent statutory publication?

Accepted Answer

A blanket label does not determine the authority’s publication duties.

The Act provides specific grounds for withholding information, alongside data-protection requirements, and the authority must apply the relevant tests.

Identify genuinely sensitive passages and explain the reason and likely harm from disclosure.

This gives the buyer a more useful basis for considering redactions than a general statement that all commercial information is secret.

Do not assume confidentiality wording overrides a statutory transparency obligation.

Question 9

How should a supplier prepare for a proposed price or scope variation?

Accepted Answer

Set out the original requirement, the requested change, its operational and financial effects, dependencies and supporting evidence.

Ask the buyer to confirm the contractual and procurement approvals and any publication requirements before implementation.

Keep the change separate from informal discussions or unapproved draft prices.

A clear record helps both parties assess legality and affordability, while protecting the delivery team from performing extra work on the assumption that a later agreement is guaranteed.

Question 10

Why should a bid price reflect the advertised contract rather than hoped-for later changes?

Accepted Answer

The procurement evaluates the offer under the stated requirements, and later modifications are legally constrained.

A strategy that depends on recovering an unsustainably low bid through unpromised variations may fail commercially and create compliance problems.

Price the required service credibly, identify assumptions through the permitted process and understand any genuine options.

Potential future work should be treated as uncertain until it is lawfully agreed, rather than being used to justify an otherwise undeliverable offer.

UK procurement: contract changes and transparency Q&A

Can a buyer and supplier agree any change after a public contract has been awarded?＋

Do Procurement Act modification rules govern all contracts currently being delivered?＋

Does a change clause in the original contract guarantee that any proposed variation is allowed?＋

Is every modification below ten per cent automatically lawful?＋

What is a convertible contract in the modification guidance?＋

Do light touch contracts use every ordinary modification ground in the same way?＋

What is the purpose of a contract change notice?＋

Can a supplier mark the entire contract confidential to prevent statutory publication?＋

How should a supplier prepare for a proposed price or scope variation?＋

Why should a bid price reflect the advertised contract rather than hoped-for later changes?＋