The Commission’s Staff Working Document (SWD) accompanies its Communication “Preparing for a wider Union”, which sets the parameters for EU preparedness to absorb new members. While the Communication details the general strategic approach in areas such as budgetary issues and governance, the SWD delves deeper into the sectorial policies that would need to be updated. Across seven policy clusters, it identifies the changes, reforms, funding needs and administrative preparations required to ensure that an enlarged Union remains effective and capable of pursuing its strategic priorities.
1. Preparing for an expanded Area of Freedom, Security and Justice
In this area, enlargement is not only about existing EU acquis, but as a test of mutual trust between national authorities. Hence, while new members would extend the geographical reach of these instruments, differences in judicial capacity and rule-of-law standards could undermine their effectiveness. Migration is equally significant: the Commission envisages closer cooperation on border management and the possibility of bringing advanced candidates into Schengen evaluation and monitoring before accession. This creates a potential route towards integration based on demonstrated preparedness, rather than membership alone, similar to the model of gradual integration used in other fields. However, it also exposes the tension between extending the benefits of integration and maintaining the safeguards on which existing members rely.
2. A larger and stronger Single Market
The Single Market chapter makes a compelling case that enlargement could expand commercial opportunities, labor mobility and competition, while also acknowledging that the benefits will not emerge automatically. Gradual integration is particularly relevant: selected mechanisms, such as the Internal Market Information System and Single Digital Gateway, could be opened to candidate countries before accession, while financial-sector authorities could help assess and strengthen their administrative capacity. The chapter also recognizes the politically sensitive question of free movement of workers, explicitly leaving open the possibility of transitional arrangements.
At the same time, membership of the Single Market requires more than formal alignment with EU law; it depends on effective enforcement, functioning regulators and the ability of businesses to operate under predictable conditions. For companies, the opportunities lie in expanding markets and reducing barriers, but regulatory divergence and uneven enforcement could remain significant obstacles. The Commission’s approach suggests that the Single Market can serve as a practical vehicle for gradual integration, although the pace and scope of access will remain politically contested.
3. Competitiveness and inclusive growth
This chapter connects enlargement directly to the EU’s competitiveness agenda, presenting a larger market, expanded production capacity, access to inputs and stronger technological cooperation as potential strategic gains. Particularly noteworthy is the emphasis on economic security: candidate countries are expected to align progressively with the EU’s approach while receiving support to implement relevant policies. Digital policy provides a concrete example, with cooperation on cybersecurity, high-risk suppliers, artificial intelligence and secure connectivity potentially extending the EU’s technological and regulatory influence beyond its current borders.
Opportunities to associate candidates with Important Projects of Common European Interest and other EU initiatives could also help integrate industrial ecosystems before membership. Yet this agenda entails a reciprocal commitment: the EU must offer credible economic benefits, while candidates must demonstrate that they can implement the rules and safeguards underpinning the Single Market. (as seen previously).
There is also a wider strategic dimension. Gradual integration could strengthen the EU’s position in competition with other global economic powers, but it requires investment in infrastructure, skills and administrative capacity rather than relying on market enlargement alone. It is clear that broadening the Single Market will not suffice to maintain competitiveness at required level. Hence, the need for a continuous integration process, including gradual integration for the potential new members.
4. A decarbonised economy and sustainable connectivity
The central tension is between the strategic benefits of a larger, interconnected European economy and the considerable costs of bringing candidate countries into the EU’s climate and environmental framework. Enlargement could strengthen the EU’s international influence in climate negotiations, improve energy security and facilitate cross-border electricity, transport and infrastructure connections. However, many candidate countries remain heavily reliant on coal and other carbon-intensive energy sources, making alignment with EU climate objectives a substantial industrial and social challenge.
The Commission recognizes that investment will be needed for renewable energy, resilient electricity grids, industrial modernisation and the transition away from carbon-intensive activities. These costs also have a distributional dimension: vulnerable regions and communities could bear a disproportionate burden, undermining public support if the transition is not managed fairly. The chapter therefore illustrates why enlargement cannot be separated from the next Multi-annual Financial Framework and the debate over the allocation of EU resources. The potential gains in energy security and connectivity are considerable, but they depend on financing and a credible pathway to convergence rather than the formal extension of EU standards alone.
5. Cohesion, agriculture and rural development, food and fisheries
This chapter brings the distributional consequences of enlargement into sharp focus. The accession of countries with lower average incomes and substantial agricultural sectors could widen economic disparities and intensify competition for EU funding, while also creating opportunities to strengthen food security, agricultural production and the Union’s overall economic resilience. One particularly important finding concerns cohesion policy: enlargement could lower the EU average GDP per capita, changing the relative position of existing regions and potentially affecting their eligibility for support.
The Commission also warns that disparities within candidate countries could increase, as capital cities and more dynamic regions grow faster than rural and peripheral areas. Agriculture presents a similarly difficult balance between opening markets and protecting politically sensitive sectors. The report leaves room for transitional measures and periods for sensitive agricultural products, while emphasizing the need for candidates to adopt EU production and food-safety standards. These are not merely technical adjustments: they foreshadow difficult negotiations over the future distribution of EU resources, agricultural support and the costs of convergence. The key political question is whether the Union can accommodate new members without undermining support among existing beneficiaries.
6. External relations: a stronger EU in world affairs
This is arguably the chapter with the clearest geopolitical rationale for enlargement. New members could strengthen the EU’s collective diplomatic weight, extend its reach in international organisations and contribute to European security, defence capabilities and resilience against hybrid threats. The Commission places particular importance on alignment with the Common Foreign and Security Policy (CFSP), alongside the progressive association of candidate countries with defence initiatives and preparedness frameworks.
Enlargement could therefore become a means of strengthening Europe’s strategic position before formal accession, especially where candidates can contribute to regional security and connectivity. However, the prospect of a larger Union also raises a fundamental question: whether increased collective weight can be translated into effective joint action. More members mean a wider range of national interests and potentially greater difficulty reaching consensus, particularly in areas where unanimity applies. This is something that the Joint Communication underlined as well when referring to governance.
The report’s emphasis on alignment and gradual cooperation acknowledges this challenge, but does not eliminate it. The underlying trade-off is between the geopolitical benefits of bringing more European countries into the Union and the risk that a larger membership could complicate decision-making. Enlargement may expand the EU’s influence, but its ability to use that influence will depend on political cohesion as much as on the number of members.
7. Administrative policies
The final chapter highlights a frequently overlooked prerequisite for enlargement: the capacity of the EU institutions and national administrations to implement and enforce common rules across a larger Union. The Commission identifies language arrangements, statistical systems, communication, anti-fraud measures, digital government and simplification as areas requiring preparation. Its emphasis on tools such as TAIEX and Twinning is particularly relevant because it recognizes that legal alignment must be accompanied by practical support, institutional expertise and functioning administrative systems.
Simplification is also presented as a benefit for existing and future members, potentially reducing compliance burdens and accelerating implementation. However, enlargement will increase demands on administrative resources, EU agencies and national authorities, making adequate staffing, financing and coordination essential. Communication matters too: public support cannot be assumed in either existing or prospective member states, particularly when enlargement is associated with concerns about costs, migration or competition for funding.
This chapter reinforces the report’s broader message that enlargement is not simply a diplomatic decision followed by a technical accession process. It requires sustained institutional preparation and the ability to deliver tangible results. Without that capacity, even well-designed policies risk becoming ineffective in practice.
Overall assessment
Across the seven chapters, the Commission advances a consistent argument: enlargement should be prepared through concrete policy integration before accession, rather than treated solely as a process culminating in membership. The potential benefits extend well beyond the accession countries themselves, encompassing the Single Market, economic security, energy connectivity, defence and the EU’s global influence. The document also makes clear, however, that these benefits come with real costs and institutional challenges.
Three issues deserve particular attention. First, the balance between gradual integration and conditionality: offering candidates earlier access to EU systems and programmes can make reforms more attractive, but the EU must retain credible incentives for meeting membership requirements. Second, the distribution of costs and benefits: cohesion funding, agriculture, infrastructure and climate investment will generate difficult choices between supporting future members and protecting the interests of existing ones. Third, institutional effectiveness: an enlarged Union must be capable not only of adopting common rules but also of enforcing them and making collective decisions.
The Staff Working Document thus provides the sectorial detail behind the broader political approach set out in the Communication, while leaving the most consequential political choices—particularly on funding, governance and the conditions for gradual integration—to be resolved through the wider EU reform and enlargement processes.
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