[3] The chapel is located on the slopes of the Cheviot Hills in the Northumberland National Park.

[2] Biddlestone Chapel was built in or about 1820 for the Roman Catholic Selby family of Biddlestone Hall, the architect probably being John Dobson who designed the now demolished Selby mansion in a severe Greek revival style.

[5] Medieval masonry from the pele tower has been retained in the lower parts of the chapel, clearly seen on the exterior.

This extends up to the eaves on the north side, with walls up to 6 feet (1.8 m) high, and as a result, the chapel appears tall for its footprint.

Upstairs is the chapel proper, with plastered walls, a timber roof, and Gothic Revival fittings.

The stained glass in the east window is attributed to William Wailes, and depicts the Crucifixion.