Becoming a member of the European Union is one of the most significant transformations a country can undertake. How a new country joins the EU step by step involves a rigorous, multi-year process that tests a nation’s political institutions, economic systems, and legal frameworks against the highest European standards.
I’ve studied EU enlargement processes for years, and the journey from application to full membership follows a remarkably consistent pattern. The entire process breaks down into three main stages: gaining official candidate status, negotiating the terms of accession across 35 complex policy areas, and finally ratifying an accession treaty.
In this guide, I will walk you through exactly what happens at each stage. Whether you are following the progress of Ukraine and Moldova, curious about Western Balkans integration, or simply want to understand how the EU grows, this step-by-step explanation covers everything you need to know.
Table of Contents
What Is EU Enlargement and Why Do Countries Join?
EU enlargement refers to the process of expanding the European Union by admitting new member states. Since its founding with six members in 1957, the EU has grown to 27 member states through seven major waves of enlargement.
Countries pursue EU membership because the benefits are substantial. Full access to the EU single market means free movement of goods, services, capital, and people across 27 countries with nearly 450 million consumers. Member states receive structural funds for infrastructure development, agricultural subsidies, and regional development programs.
Beyond economics, EU membership provides political stability, enhanced security cooperation, and a seat at the table where major European decisions are made. For many countries, particularly in Eastern Europe and the Western Balkans, joining the EU represents the culmination of post-communist transition and a definitive anchor to democratic values.
The Copenhagen Criteria: Three Requirements Every Country Must Meet
Before any country can begin the formal accession process, it must satisfy what EU leaders established in 1993 as the Copenhagen criteria. These three fundamental requirements set the baseline for membership consideration and remain the non-negotiable foundation of every successful application.
Political Criteria: Stable Democracy and Human Rights Protection
The political requirements demand that applicant countries demonstrate stable institutions guaranteeing democracy, the rule of law, human rights, and respect for minority protection. This goes far beyond holding elections.
The EU examines whether a country has an independent judiciary, free and fair electoral processes, freedom of the press, and robust anti-corruption mechanisms. Human rights protections must extend to all citizens, including ethnic minorities, LGBTQ+ communities, and vulnerable populations.
I have observed that this criterion often poses the greatest challenge for applicant countries. Establishing genuinely independent courts and uprooting systemic corruption can take years or even decades of sustained institutional reform.
Economic Criteria: Functioning Market Economy Standards
The second Copenhagen criterion requires a functioning market economy capable of withstanding competitive pressure and market forces within the EU. This means the country must have a stable macroeconomic environment, functional financial sectors, and the capacity to handle increased competition from established EU businesses.
The European Commission conducts detailed economic assessments examining inflation rates, budget deficits, public debt levels, and labor market flexibility. Countries must demonstrate they can meet the economic obligations of membership without requiring excessive transitional protections that would distort the single market.
Legal Criteria: Adopting the Acquis Communautaire
The third requirement is the ability to assume the obligations of membership, including adherence to the aims of political, economic, and monetary union. In practical terms, this means accepting the entire body of EU law known as the acquis communautaire.
The acquis comprises approximately 80,000 pages of legislation covering everything from food safety standards to environmental regulations, competition rules, and consumer protection. Candidate countries must not only adopt this legislation but also demonstrate the administrative capacity to implement and enforce it effectively.
How a New Country Joins the EU Step by Step: The Three Main Stages
Once a country believes it meets the Copenhagen criteria, the formal EU accession process begins. This journey follows a standardized pathway that has been refined through decades of enlargement experience.
Step 1: Submitting the Application and Gaining Candidate Status
The process begins when a country formally submits a membership application to the Council of the European Union. This is not a simple letter but a comprehensive document outlining the country’s motivation for joining, its assessment of readiness against the Copenhagen criteria, and preliminary plans for legal alignment.
Upon receiving the application, the Council forwards it to the European Commission for a detailed assessment. The Commission conducts what is called an analytical examination, sending questionnaires to the applicant covering every aspect of EU law and standards. These questionnaires can contain thousands of questions requiring extensive documentation.
Based on the responses, the Commission prepares a formal opinion on the country’s readiness. This opinion determines whether the European Council should grant official candidate status. The Council must approve candidacy unanimously, meaning any single member state can block the process.
Gaining candidate status is a significant milestone but does not guarantee eventual membership. Turkey received candidate status in 1999 but remains far from accession. Montenegro became a candidate in 2010 and is currently the furthest advanced in actual negotiations.
Step 2: The Accession Negotiations and Screening Process
Once a candidate country is deemed ready, the European Council unanimously approves the opening of accession negotiations. This step launches the most complex and time-consuming phase of the entire process.
Understanding the 35 Acquis Chapters
EU law is organized into 35 negotiating chapters, each covering a specific policy area. These range from free movement of goods and capital to agriculture, environment, justice, freedom and security, and foreign policy coordination.
Every chapter must be opened, negotiated, and provisionally closed before a country can join. The chapters are not treated equally, some require fundamental economic restructuring while others involve straightforward legal transposition.
The most demanding chapters typically include competition policy, agriculture, environment, and justice and home affairs. These areas often require years of institutional development and substantial financial investment to meet EU standards.
The Screening and Benchmark Process
Before formal negotiations on each chapter begin, the Commission conducts a screening process. This involves detailed analytical examinations of the candidate country’s current legislation and administrative capacity compared to EU requirements.
Based on screening results, the Commission establishes opening benchmarks for each chapter. The candidate country must meet these benchmarks before the chapter can be formally opened for negotiation. This often requires drafting new laws, creating new institutions, or training officials.
Closing benchmarks are even more demanding. To provisionally close a chapter, the country must demonstrate not just legal alignment but actual implementation and enforcement capacity. The Commission may request evidence of functioning systems operating for months or years before agreeing to close a chapter.
Why Negotiations Take Years to Complete
The negotiation timeline varies enormously depending on the country’s starting point and commitment to reform. The fastest modern accessions took three to four years for well-prepared countries like Austria and Finland.
Most candidates require five to ten years to complete negotiations. The process slows when domestic reforms stall, political will wavers, or complex bilateral issues arise. Croatia negotiated for nearly six years before joining in 2013.
Transitional arrangements can extend timelines further. Some countries negotiate extended periods to phase in certain obligations, particularly in agriculture or environmental standards where immediate compliance would cause economic disruption.
Step 3: Accession Treaty, Ratification, and Full Membership
When all 35 chapters are provisionally closed and the candidate country has demonstrated sustained readiness, the final stage begins. This culminates in an accession treaty that formally admits the new member state.
Creating the Accession Treaty
The Commission drafts the accession treaty, which serves as an international agreement between the EU and the candidate country. The treaty details the terms of membership, including any transitional provisions, financial arrangements, and special conditions agreed during negotiations.
The treaty must be approved unanimously by the Council of the European Union and receive consent from the European Parliament through a majority vote. The candidate country must also formally approve the treaty through its own constitutional procedures.
The Ratification Marathon Across 27 Member States
Here is where the process becomes particularly complex. Every existing EU member state must ratify the accession treaty according to its own constitutional requirements. For most countries, this means parliamentary approval. Some member states require referendums or have additional procedural safeguards.
The ratification process typically takes one to two years. If any single member state fails to ratify, the entire accession is blocked. This happened historically when France and the Netherlands rejected the European Constitution in 2005, though that was a treaty rather than an accession.
Croatia signed its accession treaty in December 2011 and completed ratification by all member states by June 2013, officially joining on July 1, 2013. This relatively swift ratification reflected broad political consensus about Croatia’s readiness.
Once ratification is complete, the country becomes a full EU member on the date specified in the treaty. It gains all rights and obligations of membership, including voting rights in the Council, seats in the European Parliament, and access to all EU programs and funds.
Current EU Candidate Countries and Their Status in 2026
As of 2026, nine countries hold official EU candidate status, each at different stages of the accession process. The geopolitical landscape has shifted dramatically in recent years, accelerating certain applications while complicating others.
Montenegro leads the current candidates, having opened all 33 negotiating chapters and provisionally closed three. Serbia follows with 22 chapters opened and two provisionally closed. Albania and North Macedonia are negotiating but face challenges related to bilateral disputes and domestic reforms.
Ukraine and Moldova received candidate status in June 2022 following Russia’s invasion, marking an unprecedented geopolitical acceleration. Both are conducting screening processes, though full membership remains years away given the scale of reforms required.
Georgia received candidate status in December 2023, while Bosnia and Herzegovina was granted candidate status in December 2022 but must meet additional conditions before negotiations can begin. Turkey remains a candidate but its accession process is effectively frozen due to democratic backsliding concerns.
Kosovo is considered a potential candidate with a Stabilization and Association Agreement but has not yet received candidate status due to non-recognition by five EU member states.
How Long Does It Take for a Country to Join the EU?
The timeline from application to accession varies dramatically based on preparation, political circumstances, and complexity of required reforms. Historical data provides useful benchmarks for understanding realistic expectations.
The fastest modern accessions were Austria, Finland, and Sweden, which applied in 1994 and joined in 1995 after just over three years. These countries were already highly developed economies with strong democratic institutions aligned with EU standards.
The 2004 “big bang” enlargement saw ten countries join simultaneously after an average of eight to ten years of preparation and negotiation. The Baltic states applied in the mid-1990s and joined nearly a decade later after massive transformation from post-Soviet systems.
Croatia’s accession took nearly ten years from application in 2003 to membership in 2013. This represents a more typical timeline for countries requiring substantial institutional development.
Turkey demonstrates how the process can stall indefinitely. Despite receiving candidate status in 1999 and opening negotiations in 2005, only 16 of 33 chapters have been opened and none closed. Democratic regression has effectively frozen Turkish accession despite years of effort.
For current candidates, realistic timelines suggest five to ten years minimum for those already negotiating, and potentially longer for recent candidates like Ukraine and Moldova facing reconstruction challenges alongside EU alignment.
Common Challenges and Reasons for Delay
Several recurring challenges cause delays or prevent completion of the EU accession process. Understanding these obstacles helps explain why some countries advance quickly while others stall for years or decades.
Political criteria issues are the most common source of delay. When candidate countries experience democratic backsliding, judicial interference, or media freedom restrictions, the Commission suspends negotiations or refuses to open new chapters. This has affected Turkey, Serbia, and other candidates at various points.
Territorial disputes create unique complications. Cyprus joined the EU in 2004 despite an ongoing division, but this required complex protocols excluding the northern part of the island from EU law application. Serbia cannot complete accession without resolving its relationship with Kosovo, which five EU members do not recognize as independent.
Economic readiness gaps require extensive transitional arrangements. Countries with large agricultural sectors, undeveloped environmental infrastructure, or uncompetitive industries need years to align with EU standards without causing domestic economic shock.
Domestic political opposition sometimes complicates reform implementation. When governments change or public opinion shifts against EU membership, the momentum for difficult reforms can evaporate, causing negotiation delays or regression.
Finally, EU member state objections can block progress at any stage. Because every decision requires unanimity, a single country with bilateral grievances can freeze a candidate’s advancement. North Macedonia’s progress was blocked for years by Greek objections over the country’s name, resolved only with the 2018 Prespa Agreement.
Frequently Asked Questions
What is the process for a country to join the EU?
The EU accession process consists of three main stages: first, submitting a formal application and gaining official candidate status; second, negotiating the adoption of EU law across 35 policy chapters; and third, signing and ratifying an accession treaty approved by all existing member states.
How long does it take for a nation to join the EU?
The timeline varies from three years for highly prepared countries like Austria and Finland to over a decade for countries requiring extensive reforms. Most candidates require five to ten years to complete the entire process from application to full membership.
What are the three requirements to join the EU?
The three Copenhagen criteria require: stable democratic institutions guaranteeing rule of law and human rights; a functioning market economy capable of withstanding EU competition; and the ability to adopt and implement the entire body of EU law known as the acquis communautaire.
Is it easy to join the EU?
Joining the EU is not easy. The process requires fundamental transformation of political, economic, and legal systems. Countries must demonstrate sustained commitment to democratic values, implement thousands of pages of EU law, and maintain reform momentum through multiple government changes over many years.
Can anyone join the European Union?
Only European states that meet the Copenhagen criteria and can fulfill EU membership obligations are eligible. The country must be located in Europe, have stable democratic institutions, a functioning market economy, and the capacity to adopt EU law. Geographical location and fundamental values compatibility are essential prerequisites.
Why can’t some countries join the EU faster?
Countries cannot accelerate the process because accession requires genuine institutional transformation that takes time. Rushing reforms risks creating superficial compliance without actual capacity. Additionally, all 27 EU member states must approve each stage unanimously, and complex negotiations across 35 policy areas cannot be compressed without compromising standards.
What happens if a country fails negotiations?
If a country fails to meet closing benchmarks or experiences democratic backsliding, negotiations can be suspended indefinitely. This happened to Turkey, where only 16 of 33 chapters opened and none closed. The process can also stall if a member state blocks further progress due to bilateral disputes or concerns about readiness.
Conclusion: The Path to EU Membership
How a new country joins the EU step by step is a question with a clear but demanding answer. The process transforms nations through three distinct stages: gaining candidate status, negotiating accession across 35 complex policy areas, and securing ratification from all 27 existing member states.
The Copenhagen criteria remain the foundation upon which everything rests. Without stable democracy, functioning markets, and the capacity to adopt EU law, no country can successfully navigate the accession pathway.
For the nine current candidates working through this process in 2026, the journey continues with varying degrees of progress. Montenegro leads in negotiations, Ukraine and Moldova represent unprecedented geopolitical momentum, and the Western Balkans pursue the European future they have sought for decades.
Understanding this process matters because EU enlargement shapes the future of our continent. Each successful accession extends the zone of democracy, prosperity, and cooperation that the European Union represents. For candidate countries and their citizens, the difficult road to membership ultimately leads to full participation in one of history’s most successful peace and integration projects.