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Can I Convert a Catering Trailer Myself, or Does It Have to Be Built by a Company?

by Craig
(Wigan, UK)

Chestnut brown twin-axle mobile catering trailer with a side serving hatch open at a UK showground

Chestnut brown twin-axle mobile catering trailer with a side serving hatch open at a UK showground

Hi David, Great site. I am in the process of business planning my way into professional mobile catering, and have a limited budget. I have been looking at what a couple of grand buys in the second hand market, and am frankly disgusted at whats out there! I cant imagine any of these grot boxes on eBay ever being up to my own high standards, never mind health regulations.

I have therefore thought about converting a trailer myself. I have a lot of engineering experience, so know I could practically do it, but I have read on here that any catering trailer needs to be built by a dedicated company. This seemed odd to me. What law in particular? Is there a link to any gov documents etc? I understand that any installation/maintenance work on gas and electrics needs to be carried out by qualified engineers etc, but actually converting a trailer?

Surely if a trailer is build well, all electrics and gas are installed properly and certified, and VOSA have tested the trailer if necessary, then that should meet legal requirements?

I just feel that that would be more reliable and safer than a rotten old food trailer cleaned up.

Thanks for your help.

Craig

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Jul 08, 2026
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by: MobCater

Hi Craig, I know exactly the feeling you get scrolling through those tired old trailers, and your instinct to walk away from them is a sound one. The good news is your bigger idea is sound too.

Let me clear up the myth first, because it trips a lot of people up. There is no law in the UK that says a mobile catering trailer has to be built by a dedicated company. You are perfectly entitled to convert or build one yourself, and plenty of good caterers have done exactly that. What the law actually cares about is the finished unit, not who assembled it.

So what does the finished unit need to satisfy? The food hygiene side comes under the retained EC 852/2004 food safety regulations, which your local council enforces through the Environmental Health Officer. In plain terms that means smooth washable surfaces, a proper hand wash basin with hot and cold running water, safe storage that keeps food at the right temperatures, and enough clean water on board for the food you plan to serve. You register the business with your council at least 28 days before you start trading, and the EHO will look at the unit as built, whoever built it.

The two areas you cannot touch yourself are exactly the ones you flagged. Gas has to be installed and certified by a Gas Safe registered engineer who holds the LPG mobile catering qualification, and you will need a gas safety certificate for it. The industry standard here is the UKLPG Code of Practice 24, worth reading before you design your layout. Electrics should be signed off by a qualified electrician. Get those two certificates and you are on solid ground.

You are spot on about the trailer itself too. If it is built well, road legal with the right weight rating and lighting, gas and electrics certified, and it passes your EHO check, then yes, that meets the legal requirements. One thing worth knowing: base your build on a proper trailer or horsebox rather than a touring caravan, because caravans can cause vehicle classification headaches and some LPG engineers will not certify them. A careful conversion done to the right standards will nearly always beat a rotten box someone has painted over.

One tip from experience: sketch your layout with the water and gas runs before you buy anything, because retro-fitting a sink or a gas line into a finished build is a miserable job.

Best of luck

David

Disclaimer: This is based on my experience in UK mobile catering. Rules and costs can change, and gas and electrical work must always be certified by qualified engineers, so do your own research and check with your local council before committing.

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