Senedd 2026 election campaign in Cardiff Bay, Wales

Key Points

• A person was photographed near the Senedd (Welsh Parliament) building in Cardiff, south Wales, on April 17, 2026, ahead of the upcoming Senedd devolved general election.
• The Senedd building in Cardiff Bay is the seat of the devolved legislature of Wales, established in 1999 and known as Senedd Cymru (Welsh Parliament).
• The 2026 Senedd election is due to be held on Thursday, 7 May 2026, in what analysts describe as a potentially historic poll.
• The size of the Senedd is increasing from 60 to 96 members, under a new electoral system due to take effect from this 2026 poll.
• Recent opinion‑poll projections for the 2026 Senedd contest suggest major upheaval, with Plaid Cymru and Reform UK emerging as the two largest parties, while Labour and the Conservatives face heavy projected losses.
• Poll‑based models indicate that Labour’s share of the vote could fall to around 13 per cent, a sharp decline from its historic dominance in Welsh politics.
• The campaign backdrop includes discussion of a “once in a century” institutional change, with Cardiff Bay now preparing for a larger, re‑designed parliament and a new closed‑list proportional system.

Cardiff (Cardiff Daily) April 29, 2026 – The Senedd (Welsh Parliament) building in Cardiff Bay, south Wales, has become a focal point again as the countdown to the 7 May 2026 Senedd devolved general election ticks down, with members of the public and visitors photographing the glass‑fronted chamber ahead of the vote. As reported by Toby Melville of Reuters, a person was seen taking pictures near the Senedd building on April 17, 2026, in an image that captures the structure ahead of the upcoming election. The building, which sits at the heart of Cardiff Bay’s waterfront, serves as the chamber for the devolved legislature of Wales and has been at the centre of a major political and institutional transformation in 2025–26.

Why is the 2026 Senedd election seen as a historic contest?

According to the Institute for Government’s explainer on the 2026 Senedd elections, voters in Wales are scheduled to go to the polls on 7 May 2026 to elect the seventh Senedd since devolution began in 1999. The 2026 poll is being framed by some analysts as a “landmark vote” for Welsh devolution, not only because of the substantive policy debates but because of sweeping changes to the institution’s size and electoral rules. In coverage by BBC News, political reporters in Wales describe the 2026 election as “like no other,” noting that the number of representatives in Cardiff Bay is set to rise from 60 to 96 under a reformed system.

The Senedd Modernisation Bill, which received Royal Assent in 2024, paved the way for these changes. As explained by Public Sector News, the legislation means that the Senedd will expand to 96 members, will move to a proportional closed‑list system, and will require all candidates and members to reside in Wales. The article notes that Senedd elections will also be held every four years from 2026 onwards, aligning the cycle with the new structure. These institutional shifts are unfolding against a backdrop of highly volatile political polling, which a number of outlets have highlighted as a sign of a potential realignment of Welsh politics.

How are opinion polls describing the likely political outcome?

A number of polling providers and media outlets have published projections for the 2026 Senedd election, all of which suggest that Labour’s traditional dominance could be severely weakened. In a first YouGov multi‑level regression and post‑stratification (MRP) model for ITV Cymru Wales, published in April 2026, Plaid Cymru was projected to win 43 seats in the central estimate, just six seats short of an outright majority. The same model projected Labour’s vote share to fall by 23 percentage points to around 13 per cent, which YouGov described as ending a century of dominance for the party in Welsh politics. Reform UK was shown as a key second‑place contender, with about 30 seats and a significant increase from the 1 per cent the party received at the previous Senedd election.

In a second YouGov MRP model, published for ITV Cymru Wales on 23 April 2026, the race tightened further. As reported by YouGov, the central projection showed Reform UK on 37 seats and Plaid Cymru on 36, with the contest for the largest party described as “on a knife‑edge.” The model indicated that Plaid Cymru had lost seven seats compared with the earlier April forecast, while Reform UK gained correspondingly, underscoring the volatility of the race. Coverage by ITV Cymru Wales’ political editor, Adrian Masters, in the Nation.Cymru article dated 12 January 2026, noted that Plaid Cymru had “surged ahead” as the predicted largest party, with Reform UK second and the Greens emerging in third place. Masters wrote that the changes “make it highly likely that the Senedd will see the biggest political change since it came into being as the Welsh Assembly back in 1999.”

BBC News has also highlighted the scale of the potential shift. In an article from September 2025, the BBC said that recent polling suggested Labour could finish third in the May 2026 election, framing the possibility as an “era‑defining change” in Welsh politics. The article noted that Plaid Cymru and Reform UK were competing fiercely for first place, with Labour at risk of heavy losses.

How are the main parties positioning themselves as the election approaches?

Rhun ap Iorwerth, leader of Plaid Cymru, has publicly ruled out entering a coalition with Reform UK or the Conservative Party, which party‑source reporting in the Institute for Government explainer described as a key political constraint. According to the same explainer, a potential coalition on the left of Welsh politics would therefore likely involve some combination of Plaid Cymru, Welsh Labour, the Green Party, and the Liberal Democrats. The report adds that it is not yet clear whether the Conservatives or any other party would be open to supporting a Reform‑led government in Cardiff.

Labour’s projected fall in the polls has been widely discussed in Welsh‑language and UK‑wide media. The BBC’s coverage of the “huge shift” narrative notes that First Minister Eluned Morgan, who leads the Welsh Government, is running in a much more uncertain political environment than her predecessors. The article observes that while Labour entered the 2021 Senedd election as the dominant force, current projections suggest it could be pushed into third place, with voters shifting both to Plaid Cymru and to Reform UK.

On the Reform UK side, coverage by YouGov and ITV Cymru Wales describes the party’s rise as a breakthrough, given that it secured only 1 per cent of the vote at the previous Senedd election. The model suggests Reform could win 30 or more seats, giving it a substantial presence in the enlarged chamber. The Green Party, meanwhile, is projected to win around 10 seats, marking its first significant entry into the Senedd if the polling holds.

What does the changed Senedd structure mean for voters and candidates?

The move to 96 members and a closed‑list proportional system represents a fundamental change in how Senedd elections will operate. As set out in the Institute for Government’s explainer, the electoral system will shift from the mixed‑member model used in 2021 to one in which all members are elected through a proportional list system, with party lists closed and candidates named on the ballot papers. Public Sector News notes that this redesign aims to make representation more proportional and to strengthen the link between parties’ vote shares and the number of seats they win.

In addition, the modernisation legislation requires all candidates and members of the Senedd to reside in Wales, a condition that has been framed as a way of ensuring that the devolved parliament is more closely tied to the communities it serves. The BBC’s “once in a century change” piece notes that the new rules also mean candidates will appear on party‑labelled lists rather than standing as independents in constituency contests under the old system. Campaigners and political commentators quoted in that article have said that the changes could make the Senedd more representative but have also raised concerns that some voters may not yet be fully aware of the new arrangements.

How is the campaign atmosphere around Cardiff Bay shaping up?

Against this backdrop, the area around the Senedd building in Cardiff Bay has become a symbolic space for both political hopefuls and the wider public. The Reuters photograph from April 17, 2026, shows a person taking pictures near the Senedd, capturing the building’s modern architecture against the sky of south Wales. The image is being used in commercial and editorial contexts under Reuters’ licensing platform, underscoring how the structure is once again being visually associated with the upcoming election.

Media coverage in Wales has linked the physical presence of the Senedd – with its glass atrium and waterfront setting – to the broader narrative of renewal and change in Welsh politics. The BBC and ITV Cymru Wales have both used images of the Senedd building in their election‑coverage packages, presenting it as the backdrop to potential coalition‑building talks, policy debates, and pre‑election rallies. Commentators quoted by the BBC have noted that the “once in a century transformation” of the institution is happening at the same time as a major political realignment, which could determine not only who forms the next Welsh Government but also how devolution is exercised over the next decade.

Background of the particular development

The Senedd, originally established in 1999 as the National Assembly for Wales, has evolved into Senedd Cymru (the Welsh Parliament), with progressively expanded powers over health, education, transport, and local government. The 2021 Senedd election maintained the 60‑member structure under a mixed‑member proportional system, with Labour emerging as the largest party and forming the Welsh Government in coalition or with support from other parties as needed.

In 2024, the Senedd Modernisation Bill passed and received Royal Assent, paving the way for the increase to 96 members, the closed‑list proportional system, and the residence requirement for candidates and members. Analysts at the Institute for Government and in the public‑sector media have described these changes as the most significant structural reforms since the creation of the devolved assembly. At the same time, national and polling organisations such as YouGov have begun producing detailed projections for the 2026 Senedd contest, which have been widely cited by broadcasters including ITV Cymru Wales and the BBC.

Prediction: How this development could affect voters and political players in Wales

The combination of a larger Senedd and a new electoral system is likely to reshape how parties campaign and how votes translate into seats. Under the closed‑list proportional model, parties will need to focus more on their overall list of candidates and regional campaigns rather than on individual constituency contests, which may alter how resources are allocated across Wales. For voters, the re‑design may mean more predictable proportionality between vote share and representation, but also a steeper learning curve in understanding how to vote under the new rules.

If the current polling projections hold, the 2026 Senedd election could see Labour pushed into third place, with Plaid Cymru and Reform UK as the two largest parties. In that scenario, Labour leaders would need to consider whether to support a Plaid‑led coalition or a minority government, while Plaid’s leader Rhun ap Iorwerth has already publicly ruled out coalitions with Reform UK and the Conservatives. This would leave the possibility of a left‑leaning coalition involving Plaid, Labour, the Greens, and the Liberal Democrats, or a minority Plaid government relying on ad‑hoc support.

For Reform UK, entering the Senedd with a substantial bloc of members could give the party a platform to influence housing, immigration, and fiscal policy debates in Wales, even if it does not emerge as the largest party. For the Green Party, which has never held seats in the Senedd before, the projections suggest a potential breakthrough that could push climate and environmental issues higher up the legislative agenda. Overall, the development around the Senedd building and the 2026 election points to a Welsh political landscape that is structurally more proportional but also more fragmented, with implications for coalition‑building, policy‑making, and the long‑term stability of future Welsh governments.