Total Station or 3D Laser Scanning?

Hi,

My company has recently won a contract to survey as-built positions
and levels of granite slabs and cobbles in a 60m x 40m indoor area. We
are required to survey all slab corners and individual cobbles ( a
total of 28,000 points) to an accuracy of +/- 3mm. The client is
hoping to make a claim against the flooring contractor for being out
of spec, trip hazards etc.
I was originally going to survey it conventionally with total station
and prism, but I have been thinking about other solutions. Would laser
scanning be a viable alternative? Would laser scanning give the
required accuracy? The survey was priced for about 3 weeks field time
and 1 week office.

Any advice gratefully received.

S. Thomas
Geomatics Manager