If your project has a balcony, then you will most probably have to submit calculations to the local authority.  Balconies have to be designed for a specific series of horizontal loads to comply with BS6399.  The loads depend on the use of the building.  At some stage in their life, most balconies will have to resist these loads.  It may be a group of people leaning on it to look at something passing by.

The consequences of a balcony failing can be severe.  Therefore they do need to be properly designed.

Balconies are normally constructed from either steel or timber.  However, they may also be constructed using stainless steel and glass.  Glass suppliers can normally supply test certificates to satisfy Building Control that their products comply with BS6399.  Some balcony maufacturers will also provide structural calculations or test certificates for their whole system.  So if you’re balcony is one of these, then check with your supplier first.

Balconies can be quite difficult to design.  The forces where the balustrades join the structure can be quite large, because of the bending at the base of the post and the small level arm of the connection. 

We need the following information to design a balcony

an architectural layout showing the size of the balcony

details of the the loadbearing walls or floor decking were the balcony can be fixed to

the use of the building

preferred material

Design information

All design work is carried out in accordance with BS6399 and the appropriate material code

The calculations provided will be suitable for Building Regulation approval.