Roofing
Waterproofing or roof replacement: what should the quote explain?
A recurring leak does not automatically mean a full replacement or a simple coating. Compare the diagnosis, preparation, repair scope, materials, access, and aftercare before choosing a roofing contractor in Gauteng.
Start with the source of the problem
Record when the water appears, the roof type if known, previous repairs, gutters or flashing, ceiling damage, and whether the problem changes with wind, rain, heat, or a particular roof area. Water marks inside do not always identify the entry point above them.
Ask what a visual inspection can establish and what would require opening, moisture testing, a specialist assessment, or observation during rain. A contractor should explain uncertainty rather than turning the first visible stain into a definite diagnosis.
Separate repair from preparation
A quote should distinguish cleaning, removal of failed coatings, surface preparation, replacement of damaged sections, flashing or gutter work, waterproofing, coatings, insulation, and making good inside the property.
A low coating price may not include the preparation that allows it to last. Ask which areas will be repaired, how cracks or joints will be treated, how water will drain, and what happens if the substrate is worse than expected.
Compare replacement against restoration
Ask the contractor to state why waterproofing, local repair, partial replacement, or full replacement is being recommended. Request photographs of the relevant defects and a written explanation of the expected service life and remaining risks for each option.
Do not treat a full replacement as automatically better or a coating as automatically cheaper. Compare access, disruption, waste, labour, materials, future maintenance, warranty conditions, and the consequence of another leak.
Check access, safety, and disruption
Confirm who supplies ladders, scaffolding, fall protection, edge protection, coverings for vehicles and garden areas, waste removal, and access to neighbouring or shared areas. Record working hours, weather delays, parking, noise, and how the contractor protects occupied rooms.
Ask how the team will work safely and who is responsible if weather or unsafe access stops the job. Do not choose a quote that becomes cheap only because it leaves the homeowner to arrange essential access or protection.
Read the materials and workmanship scope
Record product names, preparation requirements, coats or layers, thickness where relevant, replacement materials, flashings, sealants, fasteners, gutters, and the surfaces included. Ask whether the specified products are suitable for the roof material and exposure.
A product label is not a complete system design. The contractor should explain application conditions, curing time, weather limits, and what maintenance the homeowner must perform to preserve the result.
Compare warranties honestly
Ask what the warranty covers, how long it lasts, which preparation it depends on, the exclusions, inspection or maintenance requirements, and how a callback is handled. Confirm the responsible business if a product manufacturer and installer offer different warranties.
Keep product information, photographs, invoices, completion records, and weather or maintenance notes. A specific warranty tied to defined work is easier to assess than a general promise that the roof will never leak again.
Check the building and provider boundary
For work within a regulated building scope, ask which registrations, certificates, or statutory requirements apply. NHBRC information is relevant to its mandate but is not a blanket test for every maintenance or waterproofing job.
Record the contractor legal or trading name, scope, insurance or warranty evidence offered, and the person responsible for defects. A referral page or online review is not a substitute for checking the actual quote and provider.
Use a like-for-like quote sheet
Compare diagnosis, access, preparation, repair, materials, labour, waste, making good, warranty, payment, exclusions, and follow-up in the same columns for every contractor. Mark each item as included, provisional, or missing.
The strongest quote explains what problem it is solving and how the contractor will know the work is complete. A cheaper headline price is not a saving when it omits the preparation, access, or responsibility that controls the result.