A lump-sum contract sets a single total price covering the entire defined scope of a project, functioning essentially the same way as a fixed-price contract.
Owners like lump-sum pricing for its simplicity and budget certainty.
What Does a Lump-Sum Contract Require?
- Well-specified plans and materials
- A single agreed total price
- Accurate contractor estimating up front
- Change orders for any scope adjustments
Why Are Lump-Sum Contracts Important?
A homeowner building a detached garage with well-specified plans is a good fit for a lump-sum contract, since scope and materials are clearly defined before signing. As with any fixed-price arrangement, changes to scope after signing require a separate change order rather than being absorbed automatically.
Lump-Sum Contract vs. Fixed-Price Contract
In practice, these two terms are used interchangeably in residential construction. Both set one total price for a defined scope, and any distinction between them is mostly regional or contractual habit rather than a meaningful structural difference.