Start with the same roof and the same work.
Three prices are useful only when they describe comparable work. Write down the roof areas included, the existing layers to be removed, the material being installed and any related gutter, fascia or interior work. A lower number may reflect a different boundary rather than a better value.
Keep the original proposals. Use a separate comparison sheet to record what each contractor included, excluded or still needs to clarify. Mark an unanswered item as a question instead of assuming it is covered.
- Which buildings, slopes and roof sections are included?
- Is the quoted quantity measured roof area or an ordering quantity with waste?
- How many existing roof layers are included in removal?
- Which accessories or adjoining exterior repairs are separate?
Compare the actual products and details.
A manufacturer name alone does not identify the roof being offered. Ask for the product line, color, relevant thickness or gauge, underlayment and accessories. Compare the treatment of eaves, valleys, walls, chimneys, skylights and pipe penetrations.
A roof includes more than its visible surface. A proposal should make the important transitions understandable. Where a detail will be reused, ask how its condition and compatibility will be evaluated.
| Item | Useful question |
|---|---|
| Roof covering | Which exact product, profile, color and quantity? |
| Decking | What repair allowance or unit price applies? |
| Flashing | Which flashings are replaced, reused or excluded? |
| Ventilation / drainage | What is evaluated and what work is included? |
| Protection / cleanup | Who protects landscaping, manages debris and reviews the finish? |
Read the schedule, payment and warranty terms together.
Review the anticipated sequence, site access, permit responsibility, weather contingencies, payment milestones and change process. Ask who your project contact will be and what documents you receive at closeout.
Keep manufacturer product coverage separate from contractor workmanship coverage. Ask for the actual written terms being offered, who provides them, any registration or inspection conditions, and the maintenance or exclusions that affect them. Use the warranty guide to organize those questions before signing.
- Resolve important blanks in writing.
- Compare the agreed work before comparing the final total.
- Keep proposal revisions, approvals and closeout documents in one project folder.
What do I do with a blank or an allowance in a roofing quote?
Give every important work group a status: included at a fixed price, separately quoted, defined allowance, excluded, or unanswered. A blank is not proof that the contractor included the work. Keep a list of unanswered items and request the same clarification from every bidder.
An allowance should identify the work, amount or quantity, unit, approval process and treatment of the final difference. Do not compare a fixed contract that includes a known repair quantity with a lower total that leaves that quantity unpriced.
| Status | What the comparison sheet should say |
|---|---|
| Fixed scope | Written product/work, quantity basis and included price. |
| Separate price | Distinct work boundary, amount and whether it is an option or required. |
| Allowance | Included amount or unit, evidence, authorization and reconciliation. |
| Excluded | Who handles the work and where its cost is carried. |
| Unanswered | Exact question, responsible party and date clarification is needed. |
How do I catch a unit error or a duplicated cost?
Write the quantity and unit beside the rate. One roofing square is 100 square feet. Linear feet of edge metal, counted penetrations and lump-sum access costs cannot be replaced with the same roof-area multiplier. Keep measured area separate from an ordering allowance.
Check inclusion before adding costs. An installed covering rate may already include crew labor, tear-off, disposal or accessories. A materials-only price does not. Keep tax, delivery, permit and concealed-condition amounts on explicit lines only when the proposal places them outside the base price. Use the public budget worksheet to check the arithmetic, then ask the contractor to resolve the scope.
- Confirm SF versus SQ before multiplying.
- Check whether a quantity already includes pitch or an ordering allowance.
- Retain the original quote date and revision; compare the same revision throughout.
- Never turn a missing rate into a zero-dollar complete bid.
Sources and further reading.
- GAF residential roofing products and published warranty information
- Peak guide to roofing warranty questions
- Peak Colorado roofing cost worksheet and pricing method
This guide is general project-planning information. Use current official instructions, the selected product’s documents and property-specific professional review for the actual work.