Roof work is disruptive, costly and crucial to your home’s weatherproofing and resale value. A single missed detail can lead to leaks, rot or safety hazards years later. Before you hand a contractor a deposit, ask targeted questions, insist on a detailed written scope and watch for signs that a job is being rushed.
This article lists the practical checks every homeowner should make, explains what must be in the contract, and highlights the red flags that suggest you should pause and reconsider.
How to verify the contractor: credentials and track record
Start by confirming the contractor’s identity and legal standing. Ask for their full business name, physical office address (not just a P.O. box), business licence number, and proof of insurance that names you as additional insured during the work. For roofers, this should include general liability insurance and workers’ compensation. Call the insurer to confirm the policy is current and covers the planned scope and value.
Next, check the contractor’s track record. Request at least three recent references for similar jobs in your area and follow up with phone calls. Ask the referees specifics: did the crew arrive on time, did the final bill match the estimate, were there any leaks afterward, and how was clean-up handled? Where possible, view finished work in person to assess flashing details, ridge caps and gutter connections.
Look for membership in a recognised trade association and verify any stated certifications. Beware of contractors who refuse to provide proof of licensing or who pressure you to act immediately without documentation.
What a written scope must contain
A clear, written scope of work is your primary protection. It should be a separate section of the contract or an attached specification sheet and include the following items:
- Existing roof description: number of layers, material type, approximate square footage and any known problems to be addressed (for example, rot or decking replacement).
- Materials to be used: brand names and product codes for shingles, underlayment, ice and water shield, flashing, vents and fasteners. Vague terms like “quality shingles” are unacceptable.
- Scope of removal: whether existing roofing will be stripped to the deck or an overlay performed, and how debris will be disposed of.
- Decking and repair rules: a clear statement about how much rotten or damaged decking will be replaced and at what cost per square foot, plus an approval process for unseen damage uncovered during work.
- Flashing and termination details: where metal flashings will be installed, how valleys and roof-to-wall intersections will be handled, and whether step flashing will be used on walls.
- Ventilation plan: attic ventilation changes or additions and how they meet local code or manufacturer requirements.
- Schedule and milestones: start and expected completion dates, daily working hours and weather contingency plan.
- Payment schedule and retainage: deposit amount, progress payments tied to milestones, and a final retainage held until completion and inspection.
- Warranty and workmanship guarantee: details of manufacturer warranties on materials and any written workmanship warranty from the contractor, including duration and claim process.
- Cleanup and disposal: how nails and debris will be removed and proof of legal disposal of old materials.
Cost transparency and change orders
Avoid agreements with vague lump-sum language that allow open-ended extras. The contract should describe exactly what triggers a change order and how change orders are documented and priced. Require written approval for any additional work before it begins, with the contractor’s signature and a clear revised total.
If you need a benchmark for regional prices, consult independent cost guides before you sign. For U.S. homeowners, reputable data such as US roof replacement cost benchmarks by metro can help you understand local labour and materials ranges so you can judge estimates against market norms.
Warning signs of a rushed or low-quality job
Certain behaviours and site conditions predict problems. Watch for these red flags:
- High-pressure sales tactics: claims that a price is valid only for “today” or that you must sign immediately to avoid much higher costs later.
- Large upfront cash requests: standard practice is a modest deposit with progress payments; demands for most of the job in cash upfront are risky.
- No written estimate or a one-page invoice: lack of detail often means shortcuts on materials and workmanship.
- Multiple small crews or subcontractors without oversight: ask for a list of subcontractors and who is responsible for quality control. If the main contractor refuses, that’s a problem.
- Rushed removal and shortcutting flashing: installers who rush to nail down shingles without proper underlayment or flashing installation will create leak paths. Pay attention to how valleys, chimneys and wall intersections are handled.
- Poor housekeeping and nail debris: extensive stray nails in the yard or driveway indicate sloppy work and a higher risk of long-term damage.
Final checks before payment and after completion
Before you make the final payment, walk the roof with the contractor. Confirm that agreed materials were used, flashing and vents were installed as specified, and all penetrations are properly sealed. Collect manufacturer warranty documents, receipts for disposed materials, and any municipal inspection sign-offs. Take dated photos for your records.
Ask for a punch-list period—commonly 30 to 90 days—during which the contractor must return to fix any defects discovered after work settles. Make the final payment contingent on receipt of a signed completion certificate and the agreed warranty documents.
Being methodical now saves time, money and stress later. With clear verification steps, a detailed written scope and vigilance for rushed work, you’ll be far more likely to get a durable roof that protects your home for decades.
