Visitors to Walmer Castle and Deal Castle today might be surprised to learn that these picturesque coastal landmarks were once part of a formidable 16th-century defensive network.

Built during the reign of Henry VIII, the castles formed part of a chain of seven fortifications designed to protect England’s southern coast from invasion. Constructed at a cost of £25,000 (an enormous sum at the time) they were a direct response to political and religious tensions following Henry’s split from the Catholic Church and his divorce from Catherine of Aragon.

Tudor Castles Built for War

Walmer and Deal Castles were constructed using many materials salvaged from dissolved monasteries and religious houses. As a result, visitors can still spot intricate stone carvings more typical of churches than military structures.

Although the threat of invasion diminished soon after construction, the castles remained strategically important. They overlooked the Downs Anchorage, a sheltered stretch of water protected by the Goodwin Sands. As nearby harbours silted up, this anchorage became vital for ships waiting to enter the River Thames en route to London.

Walmer Castle: From Fortress to Seaside Residence

By the 17th century, Walmer Castle began its transformation from fortress to elegant residence. This shift was driven by Duke of Dorset, Lionel Sackville-West, appointed Lord Warden of the Cinque Ports.

Unimpressed by the cold accommodations at Dover Castle, Sackville-West chose to renovate Walmer into a comfortable coastal retreat. He added refined living quarters and improved facilities for the garrison. The surrounding land, known as “the Close”, gradually evolved into the castle’s kitchen garden, now the oldest part of its grounds.

William Pitt the Younger and Garden Design

In the late 18th century, William Pitt the Younger took up residence as Lord Warden. Having been forced to sell his private estate, Pitt used Walmer Castle as a place to host important guests - much like Chequers in Buckinghamshire is used today as a modern prime ministerial retreat.

He commissioned a bridge linking the castle to formal gardens, including the Oval Lawn, still used for events today. One side featured the historic kitchen garden, while the other was planted as an orchard for symmetry.

Pitt’s niece, Hester Stanhope, helped plan further garden expansions. Successive Lord Wardens, including the Earl of Liverpool, Robert Jenkinson and the Earl of Granville, Granville Leveson-Gower, continued these enhancements, adding features such as the Broadwalk.

In 1997, garden designer Penelope Hobhouse revitalised part of the orchard to mark the 97th birthday of Queen Elizabeth The Queen Mother, incorporating a 97-foot pond as a tribute.

A Residence of National Importance

Walmer Castle remains the official residence of the Lord Warden of the Cinque Ports and has hosted notable figures throughout history. These include Duke of Wellington, who died at the castle, and Winston Churchill, who occasionally stayed there (but in reality preferred his own Kent retreat, Chartwell). The Queen Mother was also a regular summer guest.

Today, the castle blends historic architecture with beautifully landscaped gardens, woodland walks, and wildflower meadows that support native wildlife.

Deal Castle and the Lost Fortifications

While Walmer evolved into a refined residence, much of Henry VIII’s original defensive network has disappeared. Sandown Castle has been lost to coastal erosion, and the connecting fortifications between Walmer and Deal are long gone.

However, the scenic coastal path between the two castles remains, and is even linked to a local tradition suggesting it marks the landing site of Julius Caesar in 55 BCE.

Unlike Walmer, Deal Castle retains much of its original military character. Though it too underwent modifications for comfort, it remains closer in appearance to its 16th-century design.

During the Second World War, bombing destroyed the captain’s house. It was never rebuilt, leaving the castle with a more authentic Tudor feel -  a striking contrast to Walmer’s evolution into a stately home.

Visiting Walmer & Deal Castles Today

Both castles are managed by English Heritage and are open to the public. Visitors can explore centuries of history, from Tudor military engineering to Georgian garden design, all set against the stunning Kent coastline.

Let a local Blue Badge guide set the scene for you. Whether you’re interested in history, architecture, or simply a scenic day out, Walmer and Deal Castles offer a unique glimpse into England’s past - where fear of invasion gave way to coastal tranquillity. Book your tour today.