Stormwater is rain from roofs, gutters and the ground. The sewer takes waste from toilets, sinks, showers and laundries. They are separate systems. Connecting rainwater into the sewer is not allowed by Australian water authorities. A quote that treats “the drain” as one thing has not said which system it is pricing. Ask that question before you compare anything.
What you are seeing
Say whether water ponds against the house, enters through a floor waste, overflows a gutter, or only appears in heavy rain. Say whether an indoor fixture is involved. Overflow from a sewer inside the house is a different and more urgent problem than a gutter that cannot keep up with a storm. Sewage has a different smell and a different risk. If sewage is inside, keep people away, stop using the fixtures, and treat it as urgent. If there is immediate danger, call Triple Zero (000). A gutter in a storm can usually be described for an ordinary quote once the rain has eased, unless water is entering the building and you cannot keep it out.
Do not lift a pit lid if you do not know the pit. Stormwater pits, sewer inspection openings and boundary shafts are not interchangeable, and a lid can be heavier and more contaminated than it looks. Do not rod a sewer or wash a line with a hose to “test it”. Describe the symptom and leave the opening to a licensed plumber or drainer.
Whose pipe
Gutters, downpipes and drains on the property are usually the owner’s responsibility up to the legal point of discharge. The authority’s main is not. A plumber or drainer can tell you which part they are pricing. The postcode does not answer that, and neither does this website. Ask the quote to name the length or the fitting they are pricing: a downpipe, a gutter run, a stormwater pipe to the kerb, or a sewer from the house to the boundary. If they believe the fault is in the authority’s main, ask them to say so, so you know the quote is not for that main.
In a unit, roof drainage and courtyard drains are often common property, while a fixture inside the lot may not be. The managing agent is the person who confirms which is which. Do not engage a plumber for common property unless you have authority. If you do have authority, say so in the request.
What a useful quote includes
Ask whether the work is drainage, roof plumbing, or sanitary plumbing, and which licence class covers it. Those words are not synonyms. Ask what is excluded: paving, garden reinstatement, access equipment, and council or water-authority applications if any are required. Ask whether the quote assumes the pipe can be repaired, or whether replacement is a separate option if the pipe has collapsed.
Check the licence on the register for the state or territory before you accept. PlumberQuotes introduces you to a plumber. It does not own a drain, it does not act for a water authority, and it does not publish a price for stormwater or sewer work.
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PlumberQuotes introduces you to a local plumber. It is not a plumbing contractor, and it does not promise a time.