Technical Booklet H Stairs Ramps Guarding and Protection from Impact·Page 42·5.7
Guarding of spiral or helical stairs in a dwelling
Guarding to spiral or helical stairs in dwellings must be designed and constructed to BS 5395: 2 standards.
In a dwelling, guarding to a spiral or helical stair should be designed and constructed in accordance with BS 5395: 2.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet H - Stairs Ramps Guarding and Protection from Impact.pdf