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Monkstone Lighthouse

Sea south of Cardiff, Glamorgan

Location Guide

Monkstone Lighthouse is located in the Bristol Channel, near Lavernock Point, Glamorgan.

The lighthouse is built on an underwater rock located about 5km (3 miles) east northeast of Lavernock Point and 8km (5 miles) south of Cardiff. 

The lighthouse consists of a masonry tower built in 1839, metal tower, gallery and lantern added in 1925, and lit for the first time.

Strengthened by vertical and horizontal wrought iron bands.

Prefabricated red GRP tower on top that  replaced the original iron structure in 1993.

So today we have the original 14m (45ft) stone tower with gallery, topped by a 9m (30ft) round cylindrical red fibreglass tower with its own small lantern and gallery.

In addition to the red top structure the wrought iron uprights and bands are painted red

In total it is a structure that is 23m or 75ft high.

When the tide is out this is all, or most of it is  visible, at other times its partly concealed.

In 1993 at the same time as the structure was enlarged it was converted to solar power.

 Do you know more?

I haven't been able to find so far anywhere an image of what this looked like prior to the metal part being removed from the Tower in 1993 and the new piece added. No searches anywhere bring anything up. I suspect it was known by another name up to the point it was modified.

Lighthouse information Grid


Monkstone Lighthouse, Glamorgan

Current status:

Currently in use

Geographic Position:

51 24.89 N 03 06.01 W

Located about 5km (3 mi) east northeast of Lavernock Point and 8km (5 mi) south of Cardiff. 

Grid Reference:


Ceremonial County:



The original 14m (45ft) stone tower with gallery, topped by a 9m (30ft) round cylindrical red fibreglass tower with its own small lantern and gallery making it 23m in total. The stone tower is strengthened by vertical and horizontal wrought iron bands, which are painted red.

Map Link:


Aerial photo:


Other photos:


Originally built:


Current lighthouse built:


Height of Tower:

23m    75ft

Height of light above mean sea level:

13m another source says about 21m (69ft)
The lighthouse is built on an underwater rock

Character of light:

1 White Flash Every 5 Seconds

Character of fog signal:

12 nautical miles

Range of light:


Owned / run by:

Trinity House

Getting there:

Accessible only by boat or helicopter (no platform)





Other Useful Websites:

Lighthouse Depot

Other Relevant pages:

For more articles, lists and other information see the Lighthouses Section

Lighthouse Map of England and Wales

Featured List of Lighthouses - England and Wales  

List of Minor Lighthouses and Lights - England and Wales



Please let us know any other information that we can add to the Grid or page and any errors that you discover. Before making a long trip to any location it is always wise to double check the current information, websites like magazines may be correct at the time the information is written, but things change and it is of course impossible to double check all entries on a regular basis. If you have any good photographs that you feel would improve the illustration of this page then please let us have copies. In referring to this page it is helpful if you quote both the Page Ref and Topic or Section references from the Grid below. To print the planning grid select it then right click and print the selected area.

Please submit information on locations you discover so that this system continues to grow.


By: Keith Park   Section:  Lighthouses Section Key:
Page Ref: Monkstone_Lighthouse Topic: Lighthouses Last Updated: 06/2010


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