Start with the finding
Ask each contractor to identify the component and the evidence behind the recommendation. 'Chimney repair' is too broad to compare: it could mean replacing a cap, repairing a crown, repointing mortar or investigating a liner. Keep the inspection report beside every proposal.
If contractors recommend different work, ask what observation leads to the difference. You may need a second inspection rather than another price. A more expensive proposal is not automatically more thorough, and a cheaper proposal is not automatically wrong; the scopes may simply answer different questions.
Define quantity and materials
A masonry proposal should identify the work area, preparation, materials and finish. A liner proposal should identify the product, dimensions, appliance connection and relevant installation documentation. Ask where the contractor's design assumptions come from and how compatibility will be checked.
Avoid substituting a homeowner-selected product simply because it appears cheaper online. Ask the contractor to explain the alternatives and their limitations. Record the agreed specification so the final invoice can be compared with the proposal without relying on memory.
Background for this section: FTC: avoiding home-improvement scams. Federal consumer guidance on researching contractors, written estimates and agreements.
Include the work around the repair
Roof access, scaffolding, landscape protection, debris handling and interior protection may be significant parts of a job. Ask whether these are included or separately charged. If the project crosses roofing and chimney work, establish who is responsible for each connection and for closing the building against weather.
Ask about timing, weather contingencies and the sequence of visits. Determine what happens if the contractor discovers additional damage after opening an area. An approval process for changes should identify the added work, added cost and effect on completion.
Translate warranty language
Separate manufacturer product coverage from the contractor's workmanship warranty. Ask who handles a claim and whether labor, access and replacement materials are covered. Record maintenance conditions and exclusions without assuming that a long headline warranty covers every possible failure.
Keep a copy of the written terms before work starts. If a warranty is described verbally, ask for the same statement in the proposal. For a property sale, ask whether coverage can transfer and which documents a future owner will need.
Background for this section: FTC: avoiding home-improvement scams. Federal consumer guidance on researching contractors, written estimates and agreements.
Use a comparison table with unknowns
Enter each quote in the Quote Comparison Lab. Mark an item as unknown if the proposal does not mention it; do not silently convert an omission into 'included.' Send the resulting question list back to each company before deciding.
Our tool does not award a best-contractor score. It reveals differences in the documents you have received. After the work, retain the approved scope, changes, completion photographs and final invoice in the Chimney Passport so the repair becomes part of the property's record.
Sources and scope
Hiring questions and worksheets are original editorial guidance. For technical background, consult the sources below, your appliance manual and a qualified on-site professional. This article has not been represented as a professional inspection or expert-reviewed report.
- FTC: avoiding home-improvement scams — Federal consumer guidance on researching contractors, written estimates and agreements.
Source links checked September 24, 2026. This date records the reference check, not expert approval or a change to the source’s publication date.