While this trend presents farming businesses with new income generating opportunities, there are also significant structural considerations to take into account.

Classified buildings

Historically, agricultural buildings were designed to lower building standards than commercial or residential structures. This was based on the assumption that they would not be occupied intensively by people. British Standards reflected this reality: BS 2053 (1953) and later BS 5502 (introduced in the late 1970s) codified the design requirements for agricultural buildings. BS 5502 classified buildings into four categories:

• Class 1: 50-year lifespan, unlimited human occupation.
• Class 2: 20-year lifespan, limited occupation (six hours/day at two people per 50 sq.m).
• Class 3 and 4: Shorter lifespans, minimal occupation.

When no standards are specified most agricultural buildings are built to meet the requirements of Class 2. These structures make up the majority of buildings built over the past 45 years and can be up to 35% weaker than Class 1 equivalents – particularly at beam and purlin junctions.

The risks attached to this lower load bearing class became evident during the winter of 2010–2011, when heavy snow caused over 5,000 farm buildings to collapse across the UK. Following this, CE marking (now UKCA) was introduced in 2014, reducing the classes to just two and tightening compliance requirements.

Why this matters for diversification projects

When converting an agricultural building for alternative use, several factors increase structural demands including: heavier cladding or roofing materials, higher occupancy levels, extended hours of use and additional internal loads such as fixtures and insulation.

These changes can significantly exceed the original design parameters. Assuming a building is “safe because it has always stood” is a dangerous misconception. Without proper assessment, you risk structural failure, non-compliance with Building Regulations, and potential liability.

Steps to successful conversion

Before starting an agricultural building conversion project there are some important actions to consider.

First, commission a Structural Assessment via a qualified engineer who will evaluate a building’s integrity and load bearing capacity. Next, make sure the building complies with Building Regulations including fire safety measures, emergency exits and occupancy standards. Finally, consider retrospective assessments if the agricultural building has already been repurposed – it’s wise to verify it’s fit for purpose for the current use.

Farm diversification through the repurposing of redundant agricultural buildings can provide a farming business with the potential to generate alternative income sources, but safety and compliance must come first. A proactive approach protects your investment, your reputation, and – most importantly – the people who will use your facilities.

Further information

Contact Andrew McRoyall