Prices can vary considerably for a variety of reasons, so ask the follows questions to make sure you are comparing apples for apples when deciding which is the best deal:

• Ask to see the contractors most recent jobs and confirm with the owner that they in fact did the job.
• How thick is the concrete laid?
• Does their price include reinforcing mesh?
• Do they use corner bars?
• Do they install construction & expansion joints?
• Do they install expansion foam between the concrete and walls?
• Is the foam colour coded to the concrete?
• Does their price include acid washing & sealing?
• Do they compact the soil before hand?

And remember the cheapest quote is definitely not the best quote.