Bunded fuel tanks are a legal requirement for many commercial and industrial premises in the UK. Designed to prevent fuel leaks and environmental contamination, bunded tanks provide secondary containment and are subject to a number of regulatory standards. Understanding and complying with these regulations is essential for any business storing diesel, petrol, or other fuels onsite.
In this guide, we’ll break down the current UK regulations for bunded fuel tanks, what bunding entails, and how to ensure your installation is fully compliant.
Why are bunded fuel tanks required?
Bunded fuel tanks feature a "tank within a tank" design. The inner tank stores the fuel, while the outer tank (the bund) acts as a protective layer to contain any leaks or spills. This secondary containment significantly reduces the risk of environmental harm.
Under The Control of Pollution (Oil Storage) (England) Regulations 2001, bunded fuel tanks are required for non-domestic oil storage over 200 litres, and in some domestic scenarios (e.g. if located near water sources or over hard ground). Regulations also apply across Scotland, Wales and Northern Ireland with similar frameworks.
Who needs to comply?
You must follow bunded fuel tank regulations if you store oil or fuel for:
- Commercial or industrial use (e.g. construction, logistics, marinas)
- Public sector premises (e.g. schools, hospitals)
- Domestic use over 3,500 litres
- Agricultural businesses (subject to separate regulations)
Failure to comply can lead to hefty fines, legal action, or environmental damage.
Key UK bunded fuel tank regulations
Here are the main requirements outlined by the Environment Agency and other UK regulatory bodies:
1. Secondary containment capacity
- Your bund must hold at least 110% of the tank’s capacity.
- For multiple tanks, the bund must hold either 110% of the largest tank or 25% of the total volume stored—whichever is greater.
2. Suitable placement
- Tanks must be positioned to avoid impact damage (e.g. away from traffic routes).
- Bunds should be impermeable and resistant to oil and water.
- Tanks should not be sited near open drains, watercourses or manholes unless additional measures are in place.
For more details, see our Fuel Storage Regulations Guide for UK Businesses.
3. Design and standards
Your bunded tank must:
- Be manufactured to recognised standards (e.g. OFTEC T100 for plastic tanks, BS799 for steel)
- Include secure delivery systems, shut-off valves, venting, and automatic overfill protection if the fill point isn’t visible
- Be installed on a flat, level, fire-resistant base extending 300mm beyond the tank
4. Mobile bowsers
If using a mobile Bundie Bowser, the same bunding rules apply. The bowser must:
- Have lockable valves and taps
- Prevent fuel flow when not in use
- Be impact-resistant and secure during transport
You can view our full hire range of Bundie Fuel Bowsers here.
From compact 1000L site-tow Bundie Bowsers to heavy-duty 18,000L static models, Ace Plant has fuel storage solutions to suit any site.
Maintenance and inspection
Compliance doesn’t stop at installation. You must regularly maintain and inspect your bunded fuel tanks for signs of:
- Corrosion
- Leaks
- Water ingress (especially after heavy rain)
- Loose fittings or damaged pipework
For help setting up a maintenance schedule, see our guide: Bunded Fuel Tank Maintenance: A Step-by-Step Checklist
Common compliance issues
- Unbunded tanks used commercially – tanks over 200 litres must be bunded
- Overflow or spill risks due to poor placement or inadequate secondary containment
- Old tanks not manufactured to current standards
- Infrequent inspections, leading to undetected leaks or corrosion
Why compliance matters
1. Protects the environment – Prevents fuel from contaminating watercourses and land
2. Avoids fines and prosecution – Non-compliance can result in penalties of up to £5,000 or more
3. Improves safety – Reduces fire risk and accidents
4. Extends equipment lifespan – Proper bunding and maintenance preserve your storage infrastructure
Bunded fuel tank solutions from Ace Plant
Looking for bunded tanks that meet all current UK regulations? Ace Plant – Home of the Bundie Bowser offers a wide range of fully compliant, regularly serviced bunded fuel tanks for hire.
Whether you need a 1000L static tank or a 5600L truck-mounted unit, we’ll help you stay compliant while keeping your site moving.
FAQs: bunded fuel tank regulations
Do I legally need a bunded tank?
Yes, if you store fuel for business use and your container holds over 200 litres, a bund is legally required.
How often should I inspect my bunded tank?
Weekly visual inspections and a full annual inspection by a qualified professional are recommended.
Can I use a single-skin tank at home?
Only in some low-risk domestic situations under 3,500 litres. A risk assessment is required.
How close can I place a tank to a building or boundary?
Usually, at least 1.8m from buildings and 760mm from boundaries unless fire-resistant barriers are in place.
What size bund do I need?
The bund must hold 110% of the tank’s capacity for single tanks or 25% of the combined volume for multiple containers.