car pit / ramp on the ground

[jaspercarrot]

hi wondered if any body new the measurements on a car pit / ramp as im unsure what size it needs to be i have already dig the hole 8`ft long by 28ins wide but wondered if it had to be longer and deeper how deep/ long it had to be and was there any regulations on the size and depth

[Count-A-Strong]

The hole needs to be at least 3" wider and you haven't told us the depth but according to building regulTions and BS3446 pt II you should be using a non ferrous spade to dig it out and to a depth of at least 4' 6" otherwise you will bang your he'd on the exhaust.

[AlBags]

I have an inspection pit I built in my workshop.
Finished width is 850mm in 4" brickwork with metal clad sockets and DPM around the outside. I have side entry, so only 12 ft long. No problem as you can move car to suit.
3'6" deep, as it is a sitting down pit. I have a low bench to sit on.
Been using for over 10 years now since I built, and I would only go 6" deeper if I was doing again.
Top is covered flush to the floor with 2" boards, each with 3" overlap onto top of brickwork (Shuttered around when the floor was laid and trowelled up.
Put a couple of soakaway holes using 40mm waste into rubble underneath floor, incase gets flooded.