16/05/2026
LUMP SUM CONTRACT 👷🏽♂️📄
Lump sum contract is a type of construction contract where the contractor agrees to complete the entire project for a fixed total amount.
In this type of contract, the project cost is agreed before construction starts.
For example:
A contractor may agree to build a project for ₦50 million based on approved drawings and specifications.
No matter the internal expenses, the contractor is expected to complete the project at the agreed amount unless there are approved variations.
FEATURES OF LUMP SUM CONTRACT 👇
Fixed contract amount
Clear scope of work
Based on complete drawings and specifications
Payment may be made in stages as work progresses
ADVANTAGES 👇
Easy for client to know project cost early
Encourages proper planning before ex*****on
Reduces uncertainty in budgeting
Simple contract administration in many cases
DISADVANTAGES 👇
Increase in material prices may affect contractor’s profit
Variation during construction can create disputes
Contractor carries more financial risk
Requires complete and accurate project details before starting
Lump sum contract is commonly used in:
Residential buildings
Commercial projects
Private construction works
And projects with clearly defined scope.
For lump sum contract to work properly, there must be:
Clear drawings
Proper specifications
Accurate estimation
And good documentation.
Because in construction, unclear scope can create serious problems during project ex*****on.
