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Will grow ok but compost will disappear over time and turf will settle at 6" lower eventually. What's below compost will determine the level.
I have seen a Tee box on a golf course build on organic matter (cores) taken from the golf greens... They sink, no matter how much you compact it as as John says above me the organic matter breaks down and that will cause the levels to drop.
I would imagine as long as the compost was already mature they grass will probably grow in it, although I don't know if i would be up for laying the turf directly on top of it without some soil for the initial root zone to take.
The grass should definitely grow Mark, providing that it is a good quality compost. Unfortunately the turf will definitely sink as the compost rots, you will need to explain this to the customer and ideally will need to replace with topsoil, I appreciate this is a lot of work!
I hope this helps.
why do they want it like this?
Laying turf to create a lawn will give you instant and beautiful results but it’s much more expensive than simply sowing grass seed. Make sure that if you’re replacing an old lawn, the problems that have caused your old lawn to die are resolved.
Your new turf will grow best when your soil is prepared in such a way as to encourage deep, rapid rooting. turf needs just four things (in the proper proportions) to grow: sunlight, air, water and nutrients. Grass plants obtain three of these essential factors from the soil: air, water and nutrients. You must prepare your soil, the quality of the soil and its preparation will greatly affect the quality of the lawn. The correct depth of soil with the correct structure will ensure that the grass roots penetrate evenly and deeply. This will make the lawn more drought resistant, more efficient in its water and nutrient use, and will lead to a denser sward of grass plants which helps to crowd out weeds and gives a more visually appealing lawn. Poor soil and poor preparation will cause turf to deteriorate over time.