Contract practice questions date quickly, and JCT questions date fastest of all. The 2024 Edition rolled out between April 2024 and June 2025, the 2016 Edition was formally withdrawn on 31 March 2026 and stays on sale only under transitional arrangements that end in December 2026, so a candidate whose contract knowledge stops at 2016 is describing a suite in its final months.
Here is what changed, what deliberately did not, and where the questioning tends to go. Clause references below are to the Design and Build Contract (DB 2024); numbering differs between forms, so check the form you actually use.
The suite, and the dates that matter
JCT released the 2024 Edition as a rolling programme: Design and Build first in April 2024, then Minor Works, Intermediate, the Standard Building Contract in August 2024, and the remaining families through to June 2025, when the Target Cost Contract completed the suite. The 2016 Edition was formally withdrawn on 31 March 2026, with a transitional period to 31 December 2026 during which 2016 documents remain on sale, in hard copy while stocks last and digitally through JCT's subscription services. After that, subscribers can only replicate existing 2016 templates for ongoing projects. Existing 2016 contracts remain perfectly valid; the change bites on new procurement.
Adoption followed the usual industry pattern: slow at first, then squeezed forward by the withdrawal date, with frameworks re-papering onto 2024 templates through late 2025 and early 2026. If your current project is still on an amended 2016 form, that is normal, and it makes a good interview answer if you can explain why and what would differ under 2024.
The changes a QS actually needs
Collaboration moved into the contract proper. Working co-operatively, in good faith and in a spirit of trust and respect, was an optional supplemental provision in 2016. In 2024 it is a core Article, applying by default, alongside a mandatory senior-executive negotiation step for disputes (which is not a precondition to adjudication).
Building safety is wired in. The Articles now cover both CDM 2015 appointments and the Building Regulations Part 2A dutyholders, with a dedicated Article identifying the principal designer and principal contractor for building regulations purposes. The contractor's compliance with its dutyholder obligations is a contractual duty, and breach is a termination ground. Just as important is what JCT chose not to do: the suite contains no higher-risk building machinery. No Gateway 2 or 3 mechanics, no golden thread obligations. HRB projects still need bespoke schedules of amendments, which is a genuinely useful thing to say at Level 3. Our Building Safety Act guide covers the regime itself.
New Relevant Events. Three additions matter for delay analysis: epidemics (framed to catch both new epidemics and changes in the effects of existing ones, after the Base Date); changes in law, including the exercise of statutory powers and publication of statutory guidance affecting the works; and the discovery of asbestos, contaminated material or unexploded ordnance, folded into the old antiquities clause, unless the material was identified in the contract documents or brought to site by the contractor. Asbestos, contamination and UXO are also Relevant Matters for loss and expense, while epidemics and changes in law only carry cost if the parties elect that in the Contract Particulars. That election is a live tender-stage risk allocation decision, and exactly the kind of thing a panel asks you to advise on.
Extension of time got faster. The period for deciding an interim extension application dropped from 12 weeks to 8, with a new discipline attached: the assessor must request further particulars within 14 days, and the 8-week clock restarts when the information arrives. The 12-week final review after practical completion is unchanged.
Liquidated damages after termination. The 2024 suite codifies the Supreme Court's Triple Point decision: liquidated damages run only up to termination, and losses after that fall to general damages. A tidy, examinable clause on a question panels have asked for years.
Insolvency and payment. The insolvency definition was updated for the Corporate Insolvency and Governance Act 2020 procedures, and the termination account provisions now carry Construction Act compliant payment mechanics, with express due dates and pay less notice provisions after termination. Fluctuations provisions moved out of the printed contracts to JCT's online resources.
Modernisation. Notices, including termination notices, can be served by email to the addresses stated in the Contract Particulars. Electronic execution is expressly provided for. The drafting is gender neutral. Design liability under DB 2024 is expressly reasonable skill and care, with fitness for purpose excluded, which matters for PI conversations.
Sustainability. The old optional environmental provision became a standard clause encouraging the contractor to propose economically viable amendments that would improve environmental performance. Commentators fairly describe it as modest; know it exists and know its limits.
The Target Cost Contract
TCC 2024, published in June 2025, is JCT's first ever standard target cost form: Allowable Cost plus the Contractor's Fee measured against a Target Cost, with a difference share mechanism allocating pain and gain. It gives clients who want open-book cost reimbursement with shared incentives a JCT-native answer to NEC4 Option C. It is also new enough that market case history is thin, which is itself the sharper Level 3 observation: recommending it means weighing client capability, open-book culture and market familiarity, and being able to say why a familiar amended D&B or an NEC option would or would not serve better.
Where the questions go
At Level 2, expect knowledge checks with application: name the new Relevant Events and their carve-outs, explain what changed in extension of time administration, describe how the 2024 suite handles liquidated damages on termination. At Level 3, expect advice scenarios: a client who wants to reuse last year's 2016 contract, an employer on a high-rise residential scheme asking whether JCT 2024 covers the gateways, an epidemic delay claim that turns on the Contract Particulars elections, a procurement route recommendation where target cost is on the table.
The pattern in all of them: the panel is testing whether you know the current edition and can reason about risk allocation on your own projects, using your declared competencies as the frame. If contract practice is one of your Level 3 declarations, this suite is now the ground you will be questioned on. When you want to see how the rest of your preparation compares, start with the free APC Readiness Check.