# What is a broach spire?
**A broach spire is an architectural spire form that transitions from a square tower base to an octagonal pyramidal top without the use of a parapet. The transition is achieved through four triangular flat surfaces — called broaches — that fill the gaps between the square base and the octagonal spire above.**
## How a broach spire works
The fundamental challenge of placing an octagonal spire on a square tower is geometric: four of the octagon’s sides align with the tower walls, but the remaining four corners leave triangular gaps. Broaches solve this by introducing sloped triangular planes at each corner, creating a smooth visual and structural transition.
### Key characteristics
– **No parapet:** Unlike a recessed spire, the broach spire rises directly from the tower walls.
– **Triangular broach faces:** Four inclined triangular surfaces meet the octagonal spire at the corners.
– **Continuous roofline:** The broaches merge seamlessly with the main spire planes.
– **Typically stone-built:** Most historic examples are constructed in masonry.
## Historical context
Broach spires are strongly associated with English Gothic church architecture, particularly from the 13th and 14th centuries. They are most commonly found in the English Midlands, with notable examples at St Mary’s Church in Ketton and the Church of St Denys in Sleaford. The form allowed medieval builders to construct tall, elegant spires without the added complexity of corner pinnacles or parapets.
## Applications
– Medieval parish churches throughout England
– Gothic Revival architecture of the 19th century
– Modern churches referencing historical forms
– Restoration and conservation projects on listed buildings
## Related terms
– Spire
– Octagonal spire
– Recessed spire (needle spire)
– Parapet
– Tower
– Pinnacle
– Gothic architecture
Want to learn more about construction terms? Visit our [knowledge base at fredsdiyplans.com](https://fredsdiyplans.com).