Roofing Contractor Questions: What to Ask Before You Sign

Start with the roof condition and objective

The practical decision turns on a low total price is hard to compare without a written scope. Before comparing prices, confirm material brand alone does not describe the whole roof system and flashing and ventilation details matter as much as shingles.

Checks before choosing repair or replacement

• A low total price is hard to compare without a written scope.
• Material brand alone does not describe the whole roof system.
• Flashing and ventilation details matter as much as shingles.
• Change-order rules should be understood before work starts.
• Workmanship and manufacturer warranties cover different things.

What changes roofing scope

• Roof pitch and access.
• Roofing material and underlayment.
• Decking condition beneath the visible roof.
• Flashing, vents, skylights and penetrations.
• Disposal, staging and weather protection.

Lower Mainland rain, drainage and building details

Lower Mainland roofs deal with prolonged rain, wind-driven water, tree debris and many roof-to-wall transitions. Flashing, drainage, ventilation and the condition of the deck can matter more than the visible shingle surface alone. For this specific decision, pay attention to a low total price is hard to compare without a written scope, material brand alone does not describe the whole roof system.

When the roof needs a broader assessment

A roofer should inspect more than the surface when leaks recur, decking feels soft, multiple layers are present, ventilation is poor or transitions around walls, skylights and low-slope sections are failing. Strata roofs also require the corporation or manager to control the scope. If the quote changes because of flashing and ventilation details matter as much as shingles, ask the contractor to explain the added scope before authorizing it.

Questions for the roofer

• What condition is the roof deck in?
• Which flashing and ventilation items are included?
• What could legitimately change the quoted scope?
• How will the property be protected if weather changes?
• What workmanship and manufacturer warranties apply?

Compare the complete roofing scope

Use the written scope to find the real differences between bids. Confirm a low total price is hard to compare without a written scope, material brand alone does not describe the whole roof system and who owns any follow-up work before treating the totals as directly comparable. Use the BC Quote comparison guide for a line-by-line check.

Turn the guide into a project-specific scope

Use roofing contractor questions: what to ask before you sign as a scope-building exercise. Write down what you know about underlayment and membranes, what is still unknown about ventilation, gutters and final cleanup, and what result you want at the end of the job.

The biggest quote differences often come from assumptions about leaks caused by flashing rather than field roofing. Ask contractors to state that assumption instead of pricing around it silently.

When proposals arrive, verify flashing replacement scope and roofing product and warranty line. Those details make the guide actionable on a real project rather than just background reading.

• Flashing at walls and penetrations
• Low-slope transitions
• Ventilation and cleanup details

Before hiring, also review WorkSafeBC and hiring a contractor and the BC homeowner contract-rules guide where the project involves a substantial written agreement.