2026 Construction Tenders: NEC4, JCT 2024 & the Design-and-Build Surge

The public sector construction market fractured on January 1, 2026. With the full enforcement of the Procurement Act 2023, the threshold reductions have captured a significantly wider net of mid-tier design-and-build projects, subjecting them to strict Find a Tender transparency rules. Simultaneously, the rollout of JCT 2024 has fundamentally redefined risk allocation, embedding stringent new statutory duties that bid teams can no longer treat as boilerplate compliance. For contractors targeting the next wave of framework renewals—including the highly anticipated Pagabo National Framework for Major Works—the era of copying and pasting previous tender responses is definitively over.

Bid managers are currently facing a perfect storm of regulatory convergence. The shift from Most Economically Advantageous Tender (MEAT) to Most Advantageous Tender (MAT) means that quality, environmental impact, and social value now frequently exceed 60% of the evaluation score. Furthermore, the introduction of the Competitive Flexible Procedure allows contracting authorities to design entirely bespoke tender processes, stripping away the predictable rhythms of the old Public Contracts Regulations (PCR) 2015. To win in this environment, contractors must rapidly deconstruct complex Employer's Requirements, map them against updated collaborative contracting standards like NEC4, and prove absolute competence under the Building Safety Act 2022.

In This Article

1. The Procurement Act 2023 Reality: Thresholds, MAT, and Open Frameworks
2. Mastering the Competitive Flexible Procedure
3. JCT 2024 Design and Build: Safety, Carbon, and the Golden Thread
4. The NEC4 Dominance in Major Public Works
5. What This Means for Bid Teams: A Tactical Playbook
6. Conclusion

The Procurement Act 2023 Reality: Thresholds, MAT, and Open Frameworks

The transition from the PCR 2015 to the Procurement Act 2023 represents the most significant overhaul of UK public sector tendering in a generation. For construction firms, the most immediate impact felt on January 1, 2026, was the recalibration of financial thresholds. Projects that previously sat comfortably below the radar are now subject to mandatory publication on the Find a Tender service (FTS). This regulatory dragnet has captured a vast swath of mid-tier design-and-build contracts, forcing SME and mid-market contractors to adhere to central government transparency standards.

Beyond thresholds, the evaluation criteria have fundamentally shifted. The mandate to evaluate based on the Most Advantageous Tender (MAT) rather than the Most Economically Advantageous Tender (MEAT) is not merely a semantic change. It is a statutory directive for contracting authorities to look beyond the lowest price. In current construction tenders, we are consistently seeing quality, sustainability, and social value criteria accounting for 60% to 70% of the overall score. Bidders who attempt to win purely on aggressive commercial pricing are finding themselves disqualified or severely marked down during the quality evaluation phases.

Additionally, the Act introduces the concept of Open Frameworks. Historically, if a contractor missed a framework appointment window, they were locked out for up to four years. Open Frameworks allow contracting authorities to reopen the framework to new entrants at specific intervals (typically years three and five of an eight-year term). While this presents a continuous pipeline of opportunity, it also requires bid teams to maintain persistent, automated monitoring of the FTS to catch these mid-term onboarding windows before they close.

Mastering the Competitive Flexible Procedure

Under the old PCR 2015 regime, bid teams could rely on the predictability of the Open, Restricted, or Competitive Dialogue procedures. The standardisation of the Selection Questionnaire (SQ) and the Invitation to Tender (ITT) meant that contractors could maintain a library of boilerplate responses. The Procurement Act 2023 dismantles this predictability by introducing the Competitive Flexible Procedure.

This new procedure grants contracting authorities the freedom to design bespoke, multi-stage procurement processes tailored to the specific complexities of a design-and-build project. An authority might now require an initial technical design submission, followed by a behavioural assessment of the proposed project team, culminating in a final commercial negotiation phase. For bid managers, this means every ITT is a unique puzzle. The rules of engagement, the evaluation weighting, and the submission formats vary wildly from one public body to the next.

To succeed under the Competitive Flexible Procedure, contractors must rapidly analyse non-standard ITTs to identify the specific compliance requirements and evaluation triggers. Manual review of these bespoke documents is highly prone to human error, often resulting in missed mandatory requirements or misaligned quality responses. Firms are increasingly turning to AI-powered bid analysis platforms to instantly deconstruct these complex documents, extracting the precise deliverables required for each unique stage of the flexible procedure.

JCT 2024 Design and Build: Safety, Carbon, and the Golden Thread

The release of the JCT 2024 Design and Build Contract marked a watershed moment for construction risk allocation. The Joint Contracts Tribunal explicitly updated the suite to address the legislative fallout of the Grenfell Tower tragedy, formally embedding the requirements of the Building Safety Act 2022 into the standard terms. For bid teams, this means that proving competence is no longer a post-award administrative task; it is a critical pass/fail element of the tender submission.

When responding to Employer's Requirements (ERs) based on JCT 2024, contractors must clearly articulate their assumption of the Principal Designer and Principal Contractor roles under the Building Regulations. The evaluation panels are looking for robust, evidence-based methodologies detailing how the contractor will manage Gateway 2 (building control approval before construction begins) and Gateway 3 (completion certificate before occupation). Vague assurances of compliance are heavily penalised.

Furthermore, JCT 2024 introduces critical updates regarding sustainability. Clause 2.1.5 now includes explicit environmental impact provisions, strongly encouraging the contractor to suggest economically viable amendments to the design that result in an improvement in environmental performance. In the context of MAT evaluations, bid teams must proactively integrate carbon reduction plans, lifecycle cost analyses, and sustainable material sourcing directly into their Contractor's Proposals. Authorities are actively scoring bidders on their ability to utilise Clause 2.1.5 to drive down the asset's overall carbon footprint.

The NEC4 Dominance in Major Public Works

While JCT remains popular in specific sectors, the New Engineering Contract (NEC) suite, specifically NEC4, has established absolute dominance in major central government and infrastructure works. The Crown Commercial Service (CCS) construction agreements are currently driving over £3 billion in annual awards, with a heavy, almost exclusive reliance on NEC4 contracts.

For public sector bids, mastery of NEC4 Engineering and Construction Contract (ECC) Option A (Priced Contract with Activity Schedule) and Option C (Target Contract with Activity Schedule) is non-negotiable. Contracting authorities favour NEC4 for its stimulus of good project management and its strict mechanisms for early warning notices and compensation events. However, the true complexity for bid teams lies in the Z clauses—bespoke amendments added by the employer that alter the standard risk profile.

This reliance on collaborative contracting is further evidenced by the Pagabo National Framework for Major Works 2026, which officially opened its tender window on April 27, 2026. Pagabo's documentation heavily emphasises early supply chain involvement and collaborative risk management. Bidders targeting these lots must demonstrate a profound operational understanding of NEC4 mechanisms within their quality responses. Evaluators are looking for evidence of mature risk registers, transparent open-book accounting practices, and a proven track record of collaborative dispute avoidance.

What This Means for Bid Teams: A Tactical Playbook

The convergence of the Procurement Act 2023, JCT 2024, and the dominance of NEC4 creates a highly complex, high-risk bidding environment. Bid managers can no longer rely on manual document reviews to catch every statutory nuance, Z clause, or bespoke evaluation criterion embedded within a 500-page ITT. To maintain competitive win rates, contractors must adopt a tactical, technology-driven approach.