Blenheim Palace Unveils Plans for £10.4m Roof Restoration

PLANS TO repair the roof of Blenheim Palace, a UNESCO World Heritage Site, have been unveiled as part of its “most ambitious restoration project to date”.

The £10.4 million project aims to preserve the palace’s historic architecture and safeguard its heritage for future generations.

The project will focus on the complete restoration of a substantial section of the palace roof. Commencing in January 2025, the works will be carried out by DBR Ltd, specialists in historic building conservation to maintain the authenticity of the 18th-century landmark.

The roof project is necessary due to water penetration of the roof of the Great Hall, in the Heights (formerly the servants’ quarters) and in the Saloon. Over time water has saturated the timbers below, (which are also infested with Death Watch Beetle) and is causing damage to the ‘priceless’ ceiling fresco by Sir James Thornhill. The painting depicts the Duke of Marlborough kneeling to Britannia, proffering a plan of the Battle of Blenheim.

There is also damp, roof leaks, smoke damage, dirt, mould, decay, collapsed ceilings and loss of historic fabric that has caused damage to the Laguerre painting of the Battle of Blenheim that requires urgent conservation.

Outside on the roof, there is considerable stone delamination and stone fall, as well as rusting iron cramps swelling to 12 times their size and breaking stone away, causing health and safety risks and further water penetration. The roof – almost an acre in size – is 300% under capacity and is only served by six downpipes. Excess rains mean leaks are commonplace, therefore increased rainwater capacity is needed and is part of the restoration too. As Blenheim Palace is over 300 years old, a combination of age, climate change and rainfall water penetration have led to the current state of the roof, attic timbers and ceilings below.

£10.4m Roof Restoration

The objectives of the project are to return the roofs to a watertight condition, improve environmental stability of paintings, reduce health and safety risks and prolong the lifespan of stone by slowing the rate of decay. The restoration work also aims to complete fire compartmentation works, increase the capacity of gutters and improve energy efficiency where possible and practical.

Blenheim Palace first opened its doors to the public 75 years ago to raise funds for roof conservation work. The project represents the “most significant roof restoration” in Blenheim Palace’s history. All visitor funds will contribute directly to this conservation effort in order to ensure the project’s completion by 2026.

Kelly Whitton​​​​, Head of Built Heritage at Blenheim Palace, said, “This £10.4 million restoration is a complex undertaking that will require a combination of traditional craftsmanship and innovative building techniques to safeguard the structural integrity of our UNESCO World Heritage Site

“By opening up new areas of the palace to the public and creating opportunities for visitors to see the project in action in a unique way, we aim to highlight the importance of heritage conservation while supporting heritage craftsmanship by the skilled tradespeople and specialists whose work will ensure Blenheim remains standing for years to come.”

Find out more about the roof restoration project.

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