First site selection process Under the
Laws in Wales Act 1536 Wales was fully incorporated into England and administered as a single sovereign state (the
Kingdom of England) with a single legal system (
English law). A
referendum was held in 1979 to decide whether there was support for a Welsh Assembly among the Welsh electorate. After the
1997 United Kingdom general election, the
Labour Government published a
white paper in July 1997, called
A Voice for Wales; in it, the
UK Government proposed that "(the
Welsh Assembly) headquarters will be in Cardiff ... (the) setting up (of) the Assembly is likely to cost between £12M and £17M. Additional running costs should be between £15M and £20M a year." On 18 September 1997, Wales voted in favour of a National Assembly for Wales in the
Welsh devolution referendum, with 50.30% for and 49.70% against. The
Government of Wales Act 1998 was passed by the
Parliament of the United Kingdom, and was granted
Royal Assent on 31 July 1998. The study was carried out in June 1997, and it considered 20 sites. In October 1997, both the Welsh Office and Cardiff Council agreed to the District Valuer providing an independent assessment of the market value of Cardiff City Hall and the cost of staff relocating to an equivalent standard of accommodation. On 28 April 1998, Davies announced that the site of the National Assembly building would be Capital Waterside. The agreement covered extending the lease of Crickhowell House, later known as Tŷ Hywel, until 2023, renting the Pierhead Building for 15 years and purchasing Site 1E for £1, which would be where the Senedd building was built. The Design Competition Advisory Panel was made up of seven members and was chaired by
Lord Callaghan of Cardiff, the former MP for
Cardiff South and Penarth and
Prime Minister of the United Kingdom. The chair and four other members were appointed by Davies and the remaining two members were appointed by the RIBA. The competition was advertised in the
Official Journal of the European Communities on 13 June 1998. The criteria of the competition were that the building should have a functional specification and a price tag of no more than £12 million including fees. Richard Rogers had previously designed the
Lloyd's building in London and the
Pompidou Centre in Paris with
Renzo Piano. 11 days later, Davies resigned as Secretary of State for Wales. It was planned that the outline design would be completed by June 1999, and the detailed design completed by February 2000. Construction of the building was due to begin in November 2000 and be completed in April 2001. On 22 March, Morgan stopped all work on the project to carry out a complete review. An international competition was held to select the main contractor. It was advertised in the Official Journal of the European Community, and in December 2000
Skanska Ltd was selected as the main contractor. Six months after construction had begun and with only the
piling and a temporary road around the site having been completed, Hart announced on 17 July 2001 that the National Assembly had terminated the contract of RRP. She said that despite the termination of the contract, the debating chamber should still be built to RRP's design. RRP said of the project that "From the outset, RRP has advised that the project could not be built within a construction budget of £13.1M due to client changes, the political requirement to use indigenous materials at any cost and exceptional contractor changes. RRP's advice was consistently ignored. It is plainly untrue for the Finance Minister to assert that RRP underestimated the costs." Hart said she stopped the project because of the "significant underestimates in the cost plan prepared by RRP", and that RRP "had hidden costs from the Assembly". A legal dispute then arose between RRP claiming £529,000 in fees, and the National Assembly claiming £6.85M in damages. On 10 December 2001 RRP requested an appointment of an adjudicator from the
Construction Industry Council to resolve the issue. The adjudication took place in February 2002, and ruled that RRP was entitled to £448,000 of its claim, while the National Assembly was not entitled to any of the damages they had claimed. Schal reported to a Project Board, who reported to the Minister for Finance, Local Government and Communities. The overall aim was to "deliver a landmark building…to time, to an appropriate quality and within budget". Eight companies submitted an interest in the tender process, including Taylor Woodrow, David McLean,
Laing and Skanska, of these only David McLean and the Taylor Woodrow Strategic Alliance Partnership with RRP as a subcontractor, The
topping out ceremony took place on 25 November 2004 by the
Presiding Officer,
Dafydd Elis-Thomas,
Privy Counsellor (PC), AM, which included the lifting into place of the world's largest free rotating wind driven
cowl, which was the tallest point of the building. The cowl sits above the roof line and rotates when the wind changes direction to ventilate the debating chamber. Construction of the Senedd building ended on 7 February 2006 when the National Assembly took control of the building. Other subcontractors on the project included
Arup (structural engineers), BDSP Partnership and MJN Colston (services engineers), After an address by the Queen, the
Parliament of New South Wales presented a
ceremonial mace to the National Assembly to recognise the links between Wales and
New South Wales. Two years after the opening ceremony in 2008, Taylor Woodrow Construction were fined £200,000 and ordered to pay costs of £71,400, after being prosecuted by the
Health and Safety Executive for breaching the
Health and Safety at Work etc. Act 1974 at
Cardiff Crown Court. The breach contributed to the death of John Walsh, a foreman working for Ferson Construction Services Ltd, a subcontractor of Taylor Woodrow. The accident occurred on 14 March 2004 and was due to a cavity wall that Mr Walsh was filling, collapsing on him, even though Taylor Woodrow Construction had recognised the risks before the contract had begun. Judge Neil Bidder
QC said "No-one seriously disputes it was an unsafe construction and Ferson (Construction Services) must share blame for that construction."
Timeline of cost increases and time delays The cost of the Senedd building increased from £12 million in 1997 to £69.6 million in 2006, an increase of 580%. In a report published in March 2008 by the
Wales Audit Office, the reason for the increase was that the original estimate of £12 million was not based on any detailed design of the final requirements of the building. In addition, there were unforeseen security measures after the
September 11 attacks in the United States. After the project was stopped in 2001, the contract for the construction of the second phase of the building used a fixed-price design and build contract, which meant a much tighter control of costs than in the first phase. In 2011, the official figures show that more than £157,000 had been spent on repairing the building since it had opened, with £29,000 having been spent on electrical repairs, £25,000 on fixing doors and almost £19,000 on plumbing. In addition, other repairs were also paid for by
Vinci Construction under the terms of the contract. In was reported that rain water had leaked into a steel and glass staircase reserved for members and staff and in September 2008, a committee meeting was halted after water started dripping through the ceiling. Following the passing of the
Senedd Cymru (Members and Elections) Act 2024, more works to increase the size of the newly enlarged 96 seat chamber needed to take place in order to ensure proper space for new members. In March 2025, the siambr (debate chamber) of the Senedd was closed, with debates being temporarily moved to a smaller chamber inside the Tŷ Hywel government office building. The works include the expansion of members' offices, and an expanded siambr which will be able to properly accommodate 96 MSs. The works are expected to continue until at least March 2026, but are expected to be completed before the new 96 Senedd members sit following the
2026 Senedd election. == Senedd estate in Cardiff Bay ==