Diagnosis
What observations or tests support the proposed solution?
Questions to ask a contractor
Good questions reveal whether a proposal matches the risk and includes the complete project.
Use the conversation to test diagnosis, scope, qualifications, compliance, performance assumptions, maintenance and documentation.
- Ontario-focused
- Plain-language guidance
- Risk reduction, not guarantees
The essential answer
Ask what pathway the work addresses, what evidence supports the recommendation, what remains unprotected, which permits apply and how the system will be maintained.
Who this guide supports
Use this page when the property, question or decision matches one of these situations.
- Homeowners comparing backwater-valve proposals
- Residents planning sump, drainage or waterproofing work
- Buyers requesting corrective estimates
- Property owners using a municipal rebate programme
Understand the system
Four parts of the decision deserve separate attention.
Scope
What is included, excluded and dependent on concealed conditions?
Compliance
Who obtains permits, schedules inspections and confirms local programme rules?
Handover
What records, tests, warranties and maintenance instructions will the owner receive?
Guidance 1
Questions about the problem
Ask the contractor to describe the likely water pathway in plain language and identify uncertainties.
A credible proposal should explain why the measure is relevant and what other pathways it does not address.
- What evidence supports this diagnosis?
- What alternatives were considered?
- What could change once work begins?
- What specialist input may be required?
Guidance 2
Questions about execution
Confirm excavation, access, protection, restoration, temporary services, safety, waste, weather delays and property impacts.
For occupied homes, clarify water shutoffs, noise, dust, access and how the site will be secured.
- Who supervises the work?
- What inspections occur before concealment?
- How are changes priced and approved?
- What restoration standard is included?
Guidance 3
Questions about long-term ownership
The contractor should explain operation, maintenance, alarms, backup power, access and failure signs.
Require a handover package that future occupants can use.
- What should be tested and how often?
- What parts require replacement?
- What happens in a power outage?
- Who provides service after installation?
Practical workflow
Move from observation to a documented next step.
- 1
Share the property history and observations
- 2
Ask each provider the same core diagnosis and scope questions
- 3
Verify licences, insurance and permit responsibilities
- 4
Compare exclusions, documentation and maintenance support
- 5
Record decisions and retain the final handover package
Homeowner checklist
Record each completed item and create a follow-up action for anything unresolved.
Continue through the RSM system
Related guidance, programmes and professional pathways.
Official source pathway
Use current public sources for emergency, insurance, programme and technical context.
RSM summarizes and connects information but does not replace the issuing authority. Review the current official page before acting.
Frequently asked questions
Clear limits help homeowners make better decisions.
Should a contractor guarantee that my basement will never flood?
No. Responsible providers explain risk reduction and limitations rather than guaranteeing complete flood prevention.
Who should obtain the permit?
The contract should clearly assign responsibility, while the owner should verify that required permits and inspections are completed.
What if quotes recommend different solutions?
Ask each provider to explain the pathway, evidence, assumptions and exclusions; consider independent assessment where the difference is material.
Should I ask for product model numbers?
Yes. Product information supports comparison, operation, warranty and future maintenance.
Editorial and review note
This educational page was prepared by Regional Stormwater Management using official public sources and a risk-reduction framework. It does not provide engineering, legal, insurance or municipal approval. Content is reviewed when official guidance changes and on the RSM editorial schedule.
Recommended next step
Keep the questions with the property records
Use the complete homeowner checklist library for planning, maintenance and recovery.