Bricklayer contracts are given by the home owners, construction engineers or the contractor to a main Bricklayer guy who has masons in his employ.
It depends on the project, but in Nigeria, if you are building a 3 or 4 bedroom flat and your build/construction period is over 1 year, you would have used 1 or two bricklayers, but he Masons doing the heavy lifting, mixing of Cement, laying of blocks would be in the tens.
The total manhours estimate for a 4 bedroom apartment (Bungalow) would be 30 days.
The current daily charge per mason is ₦15,000
While there is an alternate billing system.
The alternative is to charge (or be charged) per block. The rate is ₦70 per block.
You have an estimate of 4,000 blocks to complete that 4 bedroom flat.
You would have spent ₦ 280,000 on masonry alone.