Before hiring a commercial plumber, ask for verifiable NSW licence and insurance details, evidence of comparable commercial work, references and an itemised written quote. Also clarify approvals, compliance records, subcontractors, scheduling, variations, warranties and emergency availability.
Essential questions
NSW licence: What is the contractor licence number? Check the contracting business or individual on NSW Fair Trading’s public register. Confirm who will supervise the work and that everyone performing plumbing work holds the appropriate licence or certificate for their role.
Insurance: Can the plumber provide current certificates of currency for public liability insurance and workers compensation where required? Check the insured name, policy dates and cover against your site, lease, contract and procurement requirements.
Relevant experience: Have they completed comparable commercial work? Look for similar premises, operating conditions and project complexity. Ask how the plumber will manage access, shutdowns, noisy work and coordination with other trades.
References: Can you contact recent commercial clients? With the clients’ permission, ask whether the plumber followed the agreed scope and schedule, communicated clearly, managed variations transparently and supplied the required handover documents.
Written quote: Will it cover labour, materials or specified products, GST, payment terms, assumptions, exclusions, timing and estimated duration? Confirm who is responsible for opening up, waste removal and reinstatement. Require written approval of each variation, including its cost and schedule effect, before extra work begins.
Compliance: Who is responsible for approvals and records? Ask which notifications, approvals, inspections, certificates and handover documents apply, who will arrange them and who pays the fees. Requirements depend on the work and site, so verify them with the relevant authority or certifier.
Supervision: Who will perform and supervise the work? Identify the site supervisor, any subcontractors and the contractor responsible for quality, coordination and rectification. Confirm subcontracting will not change the agreed scope, insurance or warranty arrangements.
Timing and disruption: When can they start, and how will disruption be managed? Agree on working hours, shutdown windows, milestones, access requirements and delay notifications. If emergency support matters, confirm coverage hours, contact procedures, response arrangements and additional charges or terms.
Warranties: What cover applies? Obtain the workmanship warranty in writing, including its duration, exclusions, claim process and rectification arrangements. Distinguish it from manufacturer warranties and confirm who will manage product claims.
How to compare plumbers and quotes
Compare every plumber against the same written requirements rather than choosing on headline price alone.
- Check that quotes cover the same work, products, access conditions, operating-hour restrictions, shutdown planning, waste removal and reinstatement.
- Match the contracting entity across the licence register, quote, contract and insurance documents. Resolve discrepancies before appointment.
- Give weight to relevant experience, references, communication and a credible delivery plan, especially where delays or shutdowns could interrupt operations.
- Treat an unverifiable licence, expired insurance evidence, vague exclusions, unclear compliance responsibility, unpriced variations or pressure to proceed without written terms as warning signs.
For commercial work in Sydney, ask our licensed team to inspect the site and provide a scope-specific written quote.