Fire appliance access and the distance to the entrance

Fire appliance access distance is fixed by Approved Document B, not by the highway authority, and the headline numbers are 45 metres and 18 metres. A pumping appliance must be able to get within 45 metres of all points within a dwelling, and where a building has a fire main the appliance must reach within 18 metres of the inlet connection, in sight of it. Those two dimensions decide where a road can stop, how deep a courtyard block can be and whether a landscaped square works. They belong in the first sketch layout, not in the Building Regulations package eighteen months later.

What the regulations actually require of a layout

Requirement B5 of Schedule 1 to the Building Regulations 2010 asks for reasonable provision to assist fire and rescue services in protecting life. Approved Document B gives the practical route to satisfying it, and section B5 in both volumes deals with vehicle access, access to the building and firefighting shafts.

Two features of that framework catch architects out at planning stage.

The first is that Approved Document B is guidance, so an alternative approach designed under BS 9991 or BS 9999 by a fire engineer is legitimate. The second is that a planning permission granted on a layout that cannot satisfy B5 is worth very little, because the scheme will have to change at Building Regulations stage and the change may be material enough to need a fresh application.

Consult the fire and rescue authority early on anything unusual. They are not always a statutory consultee on the planning application, and they are always the people who will have to drive the vehicle.

The 45 metre rule and where the measurement starts

For a house, vehicle access should reach to within 45 metres of all points within the dwellinghouse. For a block of flats, the same 45 metre measure applies to all points within each dwelling.

The measurement is a hose-laying distance from the appliance to the furthest point inside, taken along a route the crew could reasonably follow. It is not a straight line drawn across a pond, a retaining wall or a neighbour's garden. On a deep courtyard block this is the dimension that quietly kills a layout, because the access road stops at the perimeter and the far corner of the rear flat sits 60 metres away through a gated undercroft.

For larger buildings other than dwellings the alternative is a perimeter measure, with vehicle access to a proportion of the building perimeter depending on the floor area and height of the building. Check the relevant table rather than working from memory, because the percentages step up with size.

Fire mains and the 18 metre rule

Where a building is fitted with a fire main, the pumping appliance has to get within 18 metres of the inlet connection point, and the inlet must be visible from the appliance's parking position. That second condition is the one drawings miss. An inlet tucked behind a planting bed satisfies the distance and fails the requirement.

Buildings with a storey at a height that triggers a firefighting shaft need fire mains as a matter of course, so any residential scheme approaching the 18 metre building height threshold should assume it. That same threshold pulls the scheme into Planning Gateway One, where a Fire Statement is required with the planning application under the Development Management Procedure Order and the Health and Safety Executive is consulted. A Fire Statement must be prepared by someone with the necessary fire engineering competence under the Building Safety Act 2022 framework, so an AI-assisted draft is a starting point for that professional rather than a substitute for them. The same applies to a Fire Safety Strategy prepared to BS 9991 or BS 9999.

Road width, turning and carrying capacity

The access route has to carry the vehicle, not merely accommodate its plan. Approved Document B sets out the design parameters for the two appliance types.

Carrying capacity is the parameter most often overlooked on a planning drawing. A block paved private drive over a shallow sub-base, a bridge over a culverted watercourse, or a podium slab above a car park all need designing for the load, and the structural implication of 17 tonnes on a podium is not trivial.

Dead-end access longer than about 20 metres needs a turning facility, which in practice means a hammerhead or a turning circle sized to the table above. Sketch the swept path rather than trusting the dimension, particularly where a kerb radius has been tightened to slow traffic.

Gates, bollards and shared surfaces

Gated developments work provided the fire service can get through without waiting. Agree the arrangement with the fire and rescue authority and record it, whether that is a manual override, a drop bollard operated by the service's own lock or an automatic opening linked to the alarm. A gate that fails safe in the closed position is a problem.

Bollards and removable posts used to keep general traffic out of a square are fine where the fire service holds the means of removing them, and hopeless where the only lock is opened from a management company office that closes at five.

Shared surfaces and heavily landscaped courtyards raise a different issue. If the appliance route crosses a surface designed to read as a pedestrian space, the construction still has to carry the load and the route still has to be kept clear. Bin stores, cycle stands and planters placed in the appliance route after occupation are a standing problem, which is one reason to fix the servicing and refuse strategy alongside it rather than afterwards, as the guidance on bin storage and collection points in flatted schemes sets out.

Where fire access collides with highway design

Local highway standards and the design guidance that shapes residential streets both push towards narrower carriageways, tight radii and shorter forward visibility. Fire access pushes the other way. The two are reconciled, on most schemes, by accepting a slightly wider carriageway on the primary route and designing the tertiary streets and private drives to the pump appliance dimensions only.

Where the access route sits within the public highway and needs altering, the works are delivered under a highway agreement that follows the permission, and the programme implication is real rather than theoretical, as set out in the note on section 278 agreements and how they follow a permission.

One honest uncertainty. Fire and rescue authorities differ in how they interpret access to a courtyard block, and two neighbouring services can reach different views on the same layout. Ask the one that will attend.

Evidence to put in the planning application

The planning application does not have to prove Building Regulations compliance. It does have to show that the layout can achieve it, and a competent officer will look for that.

1. A site plan with the 45 metre hose distance shown as a measured arc from the appliance standing positions, not as an annotation.
2. Appliance standing positions marked, with the 18 metre distance and sight line to any fire main inlet.
3. Swept path drawings for the pump appliance, and for a high reach appliance where the building height requires one.
4. A note on carrying capacity for any private drive, podium or structure on the route.
5. The gate or bollard arrangement described, with the access method stated.
6. Confirmation of any pre-application correspondence with the fire and rescue authority.

As an illustrative example, a four-storey courtyard block of 40 flats with a single vehicular entrance shows a pump standing position at the entrance, a 45 metre arc that leaves the two rear corner flats outside it, and no fire main. The fix is either a second access point, a through route across the courtyard built to 12.5 tonnes, or a redesign of the rear corners. Found at sketch stage it costs a morning. Found at Gateway Two it costs the programme.

To see which supporting documents a scheme of this type usually needs, enter your postcode on PlanScope and answer the guided questions.

This is general guidance, not legal advice, so check the position with your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.