Hot water and drainage jobs usually separate the cheap quote from the realistic quote
A tap repair or toilet service can often be handled inside a short attendance window. Blocked drains, sewer faults, stormwater repairs, and hot-water replacements are different. CCTV inspection, jetting, excavation risk, tempering valves, or electrical coordination can push the total well beyond the first labour estimate. If a quote looks unusually low, check whether the contractor has excluded disposal, valves, pipe upgrades, or electrical work.