What Is a Project Estimate & How to Convert It to an Invoice

A written estimate (or quotation) is a preliminary document provided to clients outlining projected costs for materials, labor hours, and potential permit fees before work begins. Providing a clear, professional estimate protects your business from misunderstandings and establishes price transparency.

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1. Estimate vs. Binding Quote vs. Bid

- Preliminary Estimate: A good-faith rough projection based on initial site review. Clearly state: "Final pricing subject to unforeseen site conditions or structural inspection." - Firm Quotation: A fixed, legally binding price commitment valid for a specified window (typically 30 days due to fluctuating material costs). - Competitive Bid: Formal procurement response submitted for municipal or commercial contracts with sealed cost breakdowns.

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2. Essential Fields for Contractor & Service Estimates

- Scope of Work Boundaries: Clearly list what is included AND what is explicitly excluded (e.g., "Painting includes 2 coats on walls; does not include ceiling repairs or drywall texture blending"). - Expiration Date: Standard "Valid for 30 calendar days from issue date" clause to prevent customers from holding you to stale material pricing months later. - Deposit Terms: State required upfront mobilization deposit (e.g., 30% upon estimate acceptance) to schedule project start dates.