Seapoint Martello Tower

Overview

Seapoint Martello Tower is perched on the north‑end cliffs of Seapoint Beach, just outside Dún Laoghaire. The round stone structure dominates the shoreline, its whitewashed walls contrasting with the deep blue of Dublin Bay. Today the tower functions as a practical amenity for beach‑goers – it houses shower and toilet facilities – but its silhouette still hints at a more martial past. The site is free to enter and open every day from 10:00 AM to 4:00 PM, making it an easy stop on a coastal walk or a quick detour after a swim.

History

Seapoint’s tower, known locally as Martello Tower No 14, was erected between 1804 and 1805 as part of a chain of 28 defensive works built from Balbriggan to Bray. Britain feared a Napoleonic invasion of Ireland, and the Martello design – inspired by the 16th‑century Genoese tower at Mortella Point in Corsica – offered a compact, cannon‑ready bastion that could command the sea approaches. Each tower is roughly 12 m high with walls up to 2.4 m thick and originally housed a single heavy gun on a 360° rotating platform.

After the French threat receded, the Seapoint tower saw a variety of civilian uses, most notably as the headquarters of the Genealogy Society of Ireland. Damp conditions eventually forced the society to vacate, and the structure fell into a state of limited use. It is now a protected structure managed by Dún Laoghaire‑Rathdown County Council and serves beach‑goers with clean shower and toilet facilities while retaining many original features such as gun‑emplacements and stone lintels.

Design and Construction

Like other Irish Martello towers, Seapoint Tower has a circular plan with two storeys. The ground floor originally served as a magazine and storage space, while the first floor provided living quarters for a small garrison. A flat roof – the terre‑plein – once carried a single heavy cannon that could swivel a full 360°. The thick masonry walls (up to 2.4 m) were designed to resist cannon fire, and narrow slit windows allowed musket fire from within.

Historical Context

Martello towers were a British response to the surprising resilience of the Genoese Mortella tower during the 1794 siege of Corsica. The design spread rapidly across the British Empire in the early 19th century, with about 140 towers built in Britain and Ireland alone. The Seapoint tower follows this pattern: a circular plan, thick walls and a single gun platform that would have covered the approaches to Dublin Bay.

Heritage and Conservation

The tower is listed as a protected historic structure and forms part of the Dublin Coastal Trail, a popular walking route that links a series of beaches and historic sites along the south‑coast of Dublin. Seapoint Beach itself holds a Blue Flag award for water quality, confirming its status as a clean, safe swimming spot. The beach retained its Blue Flag status in 2021 and continues to meet the award’s high standards.

What to See & Do

While the tower itself is modest in size, the surrounding environment provides several attractions:

• Beach access – Seapoint Beach is a shallow, flat stretch of sand and rock, popular for swimming at high tide. Slipways and hand‑rails at the north end make the water easily reachable for families.
• Water sports – The southern part of the beach is a favourite spot for canoeing and kayaking, while lifeguards patrol the area during the summer months.
• Coastal views – From the exterior of the tower you can enjoy panoramic vistas of Dublin Bay, the Dublin Mountains and the distant Wicklow coastline. The internal staircase is occasionally closed for safety, so check the noticeboard for access.
• Historical curiosity – Even if the interior is not fully open, you can still spot remnants of its military past – gun emplacements, stone lintels and the thick walls that once housed cannons.
• Practical amenities – The tower now serves beach‑goers with clean shower and toilet facilities, a rare convenience on Dublin’s south‑coast beaches.
• Cycling – The site lies on the Coastal Mobility Route, a dedicated, traffic‑free cycle corridor that links the south‑side beaches. Cyclists can safely ride from Dún Laoghaire Harbour or further east along the Dublin Coastal Trail.

Practical Information

• Opening hours – Free and open seven days a week, 10:00 AM – 4:00 PM.
• Parking – No dedicated car park. A limited number of street‑side spaces are available on Seapoint Avenue and the surrounding residential streets; arriving early in the summer is advisable.
• Accessibility – The tower is not wheelchair accessible and lacks other disability accommodations.
• Facilities – Showers and toilets are available inside the tower during opening hours.
• Nearby cafés – A short walk east to Dún Laoghaire Harbour brings several cafés and ice‑cream parlours, ideal for a post‑swim treat.

Getting there

• Car – Access the tower via Brighton Vale, which connects directly to Seapoint Avenue. The road is narrow and terminates at the tower, so allow extra time for traffic.
• Bus – Dublin Bus routes 7 and 7A stop at Queen’s Park, a short walk from the tower. Service runs from early morning until late evening on weekdays and weekends.
• DART – The nearest DART station is Seapoint, just a few minutes’ walk along the promenade. From the station, follow the signs toward the beach and the tower’s distinctive round silhouette.
• Cycling – The site lies on the Coastal Mobility Route, a dedicated cycle‑friendly corridor that links the south‑side beaches. Bicycles can be safely ridden from Dún Laoghaire Harbour or further east along the Dublin Coastal Trail.
• Taxi – Taxis are available but can be costly from Dublin city centre; the DART is usually the most economical option.

Contact For any enquiries, call 01 205 4700 (the tower is managed by the local council). More details are available on the council’s website.

Seasonal Notes

• Lifeguard coverage – Lifeguards are on duty from late June to early September, making the south end of the beach ideal for water sports during this period.
• Tide times – The north‑end slipways are most usable at high tide; consult a tide table if you plan to swim or launch a kayak.

Photography & Visiting Tips

• Best light – Early morning or late afternoon provides the most dramatic lighting for photos of the tower and the surrounding coastline.
• Dog‑friendly – Dogs are welcome on the beach in most seasons, but they are not permitted inside the tower or its shower/toilet facilities.
• Picnic spots – Small grassy areas lie just behind the tower; bring a blanket and enjoy a seaside picnic while you take in the views.

Nearby attractions

After exploring the tower, stroll along the promenade to the Seapoint Lifeguard Station, or head east to the bustling Dún Laoghaire Harbour for cafés and sailing clubs. The area is also a short bus ride from the historic James Joyce Tower Museum at Sandycove, another free Martello‑tower museum.

Enjoy the blend of military history, beachside recreation, and sweeping coastal scenery that makes Seapoint Martello Tower a unique stop on any Dublin itinerary.