The agricultural sector is constantly changing and adapting to plan for the future and enhance a vital industry. Full planning permission for agricultural (or horticultural) buildings is not always required.
Depending on the scale, siting and nature of the proposal it may fall within allowable permitted development rights, however you will need to notify the local planning authority of the proposal and await the prescribed 28 day period (prior notification).
Where the development proposal is beyond the scope of permitted development, a full planning application will need to be submitted. The details required with the application will depend on the scale and siting of the development, but additional information can include a topographical survey, landscape assessment and landscaping scheme, drainage scheme, ecology survey etc.