Guidance in Approved Document Part B states that there should be vehicle access for a pump appliance to within 18m of the dry main connection point. This is to take account of the actual distance that the fire fighters need to carry kit and lay hoses from the vehicle to the building and the time it takes to charge the main.
In some situations where the 18m distance cannot easily be met, it may be acceptable to extend the connection point beyond the face of the building to reduce the distance. However, this will not, on its own, reduce the physiological impact on firefighters of travelling long distances whilst carrying heavy equipment.
Where it is proposed to adopt an alternative approach to meeting requirement B5 (Access and facilities for the fire service) it would be advisable to seek the advice of the fire and rescue service who can advise on the practicalities of fire fighting