Five teenagers have been charged with arson after a fire tore through Rheola House, an early 19th-century Grade II-listed mansion near Neath in south Wales, leaving the historic building almost entirely destroyed.

The blaze broke out on 18 August at the isolated property. South Wales Police have since charged four young men and a youth in connection with the incident: Kyle Renzoni, 18, Ellis Harding, 19, Yian Foster, 18, and Evan Traynor, 18, alongside an unnamed 17-year-old who cannot be identified because of his age. All five have been charged with arson with recklessness as to whether life was endangered.

The loss of the building is a significant blow to Welsh architectural heritage. Rheola House was constructed between 1812 and 1818, standing on an estate covering more than 110 acres. Welsh heritage body Cadw has previously described the property as "an important early 19th century country house in the picturesque tradition."

The building carries substantial historical pedigree through its creator, the celebrated architect John Nash. Nash, who went on to design landmark British structures including Buckingham Palace, Marble Arch and Brighton's Royal Pavilion, had established strong personal links to Wales. He moved to Carmarthen in 1784 and spent three years working on local commissions across the region before returning to London and securing the patronage of the Prince Regent.

At the time the fire took place, the property was at the centre of major regeneration ambitions. Its owners, The Brook Group, had drawn up plans to transform the historic mansion into an upmarket retreat featuring a boutique hotel, a bar, a restaurant, a swimming pool and a spa. The broader vision for the estate included building 295 lodges, a dedicated sports complex, commercial areas and further dining facilities.

Jason Brook, chief executive of The Brook Group, described the fire as a "devastating setback", particularly as the company had only recently overcome longstanding obstacles that had stalled the project for years. He commended the response from law enforcement, stating: "We would also like to commend and applaud the swift actions of South Wales Police which has lead to the apprehension of five people who have now been charged."

Mr Brook made clear that the full structural impact is severe. "The damage to the main house is extremely significant," he said. "We will now be taking professional advice on the consequences of the fire and will liaise with the appropriate authorities to determine the next steps." He added that the firm's sincere hope is to "emerge from this tragedy and continue with our plans for the Rheola Estate and its future."

Emergency services faced a difficult task on the night due to the geographical position of the site. Mr Brook paid tribute to the firefighters involved, noting: "The house is in a remote location, which makes the efforts of fire crews in these circumstances even more challenging, and we are extremely relieved that all of the emergency service personnel who attended are safe."

The estate has also featured in recent legal history prior to the blaze. It was previously at the centre of an illegal waste dumping case, in which businessman Howard Rees, 65, and cattle farmer Huw Leyshon, 53, were convicted for running a £2.6 million operation on the grounds, pocketing £1.4 million and £1.2 million respectively.

What we do not yet know is whether any part of the main house structure can be salvaged, or how the damage will alter the broader redevelopment plans. Those questions will depend on structural assessments and discussions with the relevant planning and heritage authorities.

As the legal process begins against the five teenagers, I'll be following this one — check back for updates.