Would you like me to come and build it for you too?

"Emergency Access

DB32 (3.21) states that the Home Office currently recommends a minimum carriageway width of 3.66m for emergency access to access roads (British Standard 5588: Part 1). Fire appliances need to be able to reach with in 45m of a suitable dwelling entrance. In some cases it is possible for an appliance to reach the scene of a fire along a 2.75m carriageway as long as the absence of parked cars can be ensured. BS 5588: Part 1 states that it is necessary to consult the fire authority to ascertain their recommendations relating to access roads in terms of loadbearing capability, turning circles, width and headroom. Places, Streets and Movement (74) also says that adequate access must be provided for emergency vehicles and provides some general advice on the subject, but no quantitative guidance."

Hope that helps, probably best to talk to fire and ambulance people in your area.