How far should a battery container be from buildings?

Where the container goes is one of the first decisions in a containerised battery project, and often the one that decides whether a site can take a battery at all. The question people ask is how far it has to be from buildings. This post explains the figure most often quoted, where it comes from, what it applies to and how it is used in practice. For the rest of the project, see BESS installation step by step.

The 30 m figure and where it comes from

The National Fire Chiefs Council guidance for fire and rescue services, approved in December 2025, says distances between battery cabinets and occupied buildings will vary with the individual site design, and should take account of risks including the impact of any vapour cloud. It then proposes an initial minimum distance of 30 m between battery cabinets, or associated infrastructure such as transformers and switchgear, and occupied buildings, before any mitigation such as blast walls is considered. The guidance says the figure is based on the 100 ft distance for remote installations cited in NFPA 855:2023, the US standard for stationary energy storage.

Three details matter when you read it:

• It applies to open-air lithium systems of 1 MWh or more. The guidance is written for that scale.
• It is a starting point. Mitigation incorporated in the design can justify a different distance, if the evidence supports it.
• It is measured to occupied buildings, and the associated transformers and switchgear count as well as the battery cabinets.

How the distance is used in planning

In England, the government’s planning practice guidance encourages applicants proposing a battery of 1 MWh or more (other than one serving a dwelling) to talk to the local fire and rescue service before applying, and encourages planning authorities to consult it. The fire service will read the layout against the NFCC guidance, so a design that starts at 30 m, and shows clearly where and why it departs from it, is easier to support. More on that in battery storage planning permission.

Other spacing the guidance asks for

Separation from buildings is not the only clearance on a battery site. The NFCC guidance also says:

• Keep combustibles away. Areas within 3 m of battery cabinets or enclosures should be kept clear of combustible vegetation, and nothing combustible should sit next to them, because it can create a bridge for flame or radiant heat between units.
• Avoid stacking. It treats stacking units on top of each other as a higher risk, because of vertical fire spread, fire loading and the difficulty of access.
• Plan access with the wind in mind. It prefers an alternative access point, chosen with the likely wind direction in mind, so crews do not have to drive through a vapour cloud; failing that, a perimeter loop road.
• Provide water. Hydrants able to deliver no less than 25 litres per second, or an equivalent static supply for two hours where that flow cannot be achieved.

Smaller systems

Many behind-the-meter business batteries are below 1 MWh, and the NFCC figure does not apply to them directly. Their siting is set by:

1. The fire risk assessment for the premises, which must be reviewed when a battery is added.
2. The manufacturer’s installation instructions, which usually specify clearances around the unit for cooling, maintenance and fire separation.
3. Your insurer, whose conditions on separation from buildings and stock are often the deciding factor.

The standards behind those decisions are set out in the battery storage fire safety regulations guide.

Practical layout tips

Draw the site to scale with the battery, transformer and switchgear on it before anyone quotes. Mark occupied buildings, boundaries, escape routes and stored materials, and show the prevailing wind direction, which the NFCC guidance asks site plans to include. Where 30 m does not fit, ask the installer what mitigation they propose and what evidence supports it, and share the layout with your insurer at the same time. If there is no realistic outdoor position, an indoor cabinet installation in a properly compartmented room may be the better route. To get installers’ views on your site, request quotes here: your enquiry is passed to installers who cover your area, and this site is not one of them.