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Flatholm's laundry building, an old palace and a disused train station - just some of Cardiff’s most at risk buildings.

There are 27 buildings which are at risk - five fall into the most serious category of “extreme risk” category one.

The rest are in category three.

All buildings in the list – compiled by Cadw, the Welsh Government, The Handley Partnership and Cardiff council - are given a “critical element factor score”, determining the building’s level of risk. This is based on an assessment of the building’s condition, its individual rate of deterioration and the building’s occupancy level.

The number of buildings which were classed as being “at risk” in 2011 was 35, so the current list of 27 shows an improvement.

The most at risk buildings (as calculated in 2015)

1. Laundry building to former isolation hospital at Flatholm Island

In July 1883, the steamship Rishanglys left three seamen on the island who were believed to be suffering from cholera, one of who then died. The only accommodation was then a canvas tent and people on the island applied for compensation to create the hospital and outbuildings.

2. Former isolation hospital at Flatholm Island

A permanent sanatorium was built for cholera patients in 1896. It had two six-bed wards and a nurse's room. Sailors who arrived in Cardiff and were ill were sent there as a precautionary method. It is the only such hospital on an island in Britain. The hospital finally closed in 1935.

3. Great House farmhouse and barn, St Fagans

The great farmhouse at St Fagans is a listed building.

4. Pen Pil at Trowbridge

Also known as Pen Pil Kennels, this is at the end of Wentloog Road but there is no throughfare access. It is a listed building and described as "a traditional regional farmhouse mainly retaining its historic fabric".

5. Summerhouse and underground vaulted chamber in the grounds of Rookwood Hospital

Believed to be an 18th century summerhouse, the building is now in a poor condition with the detail now lost. The interior of the chamber suggests it could have been used as an icehouse.

6. Garden wall to the east of Pentrebane farmhouse

Situated around 1,000m north of St Fagans village the wall surrounds what was believed to be an 18th century farmhouse.

7. Cardiff Bay railway station

Plans for this building to be transformed into a new museum have been put forward. The station was originally known as Cardiff Docks, then Bute Road and then Cardiff Bay. Only one platform is now used with the rest boarded up.

8. Octagonal shelters in Whitchurch Hospital

Designed to help patients get fresh air, there are a number of such shelters in the hospital grounds. They are thought to have been built around 1910

9. Barn at Pant-y-Gored in Pentyrch

The barn is a listed building and a combination of stone, slate and brick. The barn is listed "as a regional barn and for group value with the farmhouse".

10. Old Leckwith Bridge, Canton

You can still see the brick bridge from the bridge built in 1934. It is believed to medieval in origin and partly reconstructed in the 18th century.

11. Front garden wall of Rose Cottage, St Fagans

The Rose Cottage was built in the first half of the 19th century. The wall runs along the street boundary.

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12. Flight of steps and retaining wall at Insole Court

Insole Court is in the middle of a £4m restoration project which has been delayed after huge discoveries inside. The outer buildings have now been opened, but work remains ongoing inside. Insole Court was built in 1856 and the family behind the extravagant project are believed to have been copying the style of Cardiff Castle.

13. Ruins of the Old Bishop’s Palace, Llandaff

The former gatehouse is what remains of the ruined residence of the bishops of Llandaff. It is believed the palace was damaged by Owain Glyndwr in the rebellion of 1402-5.

14. Former stable block at Faendre Hall, Trowbridge

This was probably built in 1850, and while described as modest in size, there are "architectural flourishes" which makes it appear grander. The stable was built in a gothic revival style.

15. Barn to the west of Pentrebane Farmhouse

This very large barn was built in the early 18th century and then made bigger.

16. Chapel at Whitchurch Hospital

The chapel was built in 1902. It is detached from the main hospital and is no longer used as a chapel.

17. Bethel Calvinistic Methodist Church

Reportedly built in Radyr in 1817 and rebuilt in 1905 according to the Royal Commission on the Ancient and Historical Monuments of Wales.

18. The Coal Exchange

Currently at the centre of a £35m redevelopment project, Cardiff's Coal Exchange building is a jewel of the city's historic crown. The first £1m cheque was signed here and it's seen iconic gigs and events. Now, it is due to be turned into a luxury hotel.

19. Ivy House farmhouse, Tongwynlais

Now between the A470 and the River Taff it can be reached via an underpass. The farmhouse is believed to be 17th century.

20. Former HM Immigration office, Butetown

A three-storey building, it was designed by Henry Tanner who also created the old post office. It was built in 1898. Permission has previously been granted for developers to redevelop the building.

21. Memorial to Reverend Lisle in St Mary of the Blessed Virgin in St Fagans

The memorial is at the east side of the church. It is a combination of ashlar and iron railings. Rev Lisle died aged 92 but had been rector of the parish for 64 years.

What can be done?

Statutory powers can be used to ensure owners carry out the necessary works for the ‘proper preservation’ of buildings. The council can also work with other service areas to protect council-owned buildings.

Examples of “successful interventions” are listed as Insole Court, Pritchard Bridge, Bishop’s Palace.