At a Glance
Adelaide's combination of mature street trees and pre-1970 clay drainage pipes makes root intrusion a persistent problem across the inner suburbs. Drain clearing costs $100–$700 per job, with SA trade rates sitting 10–15% above east coast capitals.
What's Included in the Price
The job covers attendance, locating the blockage, clearing it using an electric eel, drain rods, or high-pressure water jetter, and testing the flow to confirm the drain is running. All drainage work must comply with AS/NZS 3500 Plumbing and Drainage. CCTV camera inspection is quoted separately, typically recommended for recurring blockages or when root intrusion is confirmed. Pipe repairs, relining, or excavation for collapsed sections are separate quotes. The callout fee is included in the base price. Reinstatement of any disturbed paving, concrete, or landscaping is not typically included in the drain clearing scope.
What Affects the Cost
- Clearing method. Electric eel or rods for simple blockages. High-pressure jetting for roots or hardened grease. CCTV adds a diagnostic component.
- Reactive clay soils. Adelaide's clay soils expand when wet and shrink when dry, shifting pipes and opening joints.
- Tree root intrusion. Moreton Bay figs, gum trees, and ornamental figs in established suburbs have aggressive root systems that target drain joints.
- Pipe age and material. Pre-1980 clay pipes with cement mortar joints are the most susceptible to root entry and displacement.
- Blockage location. A sink trap blockage is quick. A deep sewer line blockage in the front yard requires longer equipment runs.
- Stormwater considerations. Adelaide's winter rainfall loads stormwater drains that may already have partial root or debris blockages.
A grease blockage in a kitchen drain cleared with an electric eel in a newer Seaford home sits toward $100. Recurring root intrusion from mature figs in a pre-1970 clay sewer line in Unley, requiring extended jetting and CCTV investigation of displaced joints, pushes toward $700.
Blocked drains can escalate quickly when sewage backs up into showers or floor wastes. After-hours, weekend, and public holiday callouts carry premium rates. If only one drain is slow and there is no sewage overflow, scheduling during business hours saves money. If sewage is backing up or multiple fixtures are affected, call immediately.
Adelaide-Specific Considerations
Adelaide's established suburbs, including Unley, Burnside, Norwood, Prospect, and Colonel Light Gardens, are heavily planted with mature fig trees, gum trees, and ornamental species. These trees were planted decades ago when sewer pipes were vitrified clay with cement mortar joints. The root systems have had 40 to 60 years to find and exploit every weakened joint. In these suburbs, tree root intrusion is the single most common cause of sewer blockages. Clearing roots provides temporary relief, but unless the pipe is repaired or relined, re-blockage within 12 to 18 months is typical.
Adelaide sits on reactive clay soils across much of its metropolitan footprint, particularly through the inner and eastern suburbs. Seasonal moisture cycles cause the clay to expand and contract, physically moving buried pipes and opening joints. This ground movement compounds the root intrusion problem. Displaced joints create larger entry points for roots and soil. Properties that experience cracking in walls or sticking doors during summer are likely also experiencing pipe movement underground.
Report main sewer blockages to SA Water on 1300 883 121. Blockages affecting multiple properties or causing overflow at the SA Water maintenance shaft are SA Water's responsibility. Your private sewer connection from the house to the SA Water main is your responsibility to maintain. SA Water can provide a sewer service diagram showing where your private connection meets the main.
Hiring a Licensed Plumber in SA
All drain clearing work in South Australia must be done by a plumber licenced through Consumer and Business Services (CBS). Check licences through the CBS online register. For notifiable plumbing work including drain repairs and new connections, the plumber must issue a Certificate of Compliance. Confirm their CBS licence number, public liability insurance, and get a written quote specifying the clearing method, whether CCTV is included or extra, and any charges for difficult access.
How We Calculate
Estimates are based on current licenced plumber rates in the Adelaide metropolitan area, adjusted for SA's reactive soil conditions, typical property age, and common drainage materials. All figures include GST. Prices cover standard residential drain clearing. Commercial, body corporate, or SA Water main blockages fall outside these ranges.