Compare Roof Bids Without Comparing Different Projects
Normalize the scope before comparing the price
Illustrative roofing photograph from our gallery—not documentation of a specific project, location, or outcome discussed in this chapter.
Two roof proposals can have similar headings and very different scopes. Comparing only their totals can hide missing repairs, different assumptions or an incomplete specification.
Establish a Common Baseline
Confirm that each proposal describes the same roof areas and existing conditions. Identify whether inspection, moisture investigation or measurements are complete. Ask each bidder to explain the limits of their assessment.
Create a comparison list for cleaning, preparation, damaged-area repair, drainage work, penetration details, primers, reinforcement, coating specifications and closeout documents. A vague allowance is not equivalent to a clearly defined item.
Compare Written Terms
Ask for the current manufacturer system requirements and how the specified work will meet them. Do not assume that similar coating names mean identical thickness, preparation or warranty eligibility.
Compare the warranty issuer, term, coverage, exclusions, maintenance requirements and project qualification process. Manufacturer NDL options of 10, 15, 20, 25 or 30 years are subject to qualification; a headline is not a warranty document.
Expose the Unknowns
- Identify exclusions and owner responsibilities.
- Compare allowances and change-order procedures.
- Clarify access, equipment and permit responsibilities.
- Ask how concealed wet or deteriorated areas affect the price.
- Confirm documentation and acceptance requirements.
Question to Ask
What work is included in the other proposal that is not included here, and what evidence supports the difference?
Choose using the complete scope, qualification and written terms. This article does not provide a market price, savings guarantee or recommendation for an uninspected roof.