Lumpsum contracts are usually used when you have a clearly defined scope of work and they are relatively straight forward to complete. For instance, a deck builder could better use a lumpsum contract since the drawings and designs are straightforward and remain unchanged throughout the duration of project scope.
This type of contract provides a high risk to the contractor. If the project has an issue requiring additional labour or material then the contractor has to bear the responsibility for extra cost since the prices won’t change accordingly and price adjustments are made in contract based on a pre-decided formula.
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