What's Included in the Price
A standard blocked drain job covers attendance, diagnosis of the blockage location and cause, clearing using an electric eel or drain rods, and a flow test to confirm the drain is running clear. All drainage work must comply with AS/NZS 3500:2025 Plumbing and Drainage (updated April 2025, mandatory from October 2025). For stubborn blockages, particularly tree root intrusion or grease buildup in longer sewer runs, high-pressure water jetting at 3,000–5,000 PSI is used. CCTV camera inspection ($250–$550 as a standalone service) diagnoses recurring blockages or confirms pipe condition after clearing. Pipe repairs, relining ($200–$350 per metre after initial setup), or excavation for collapsed drains are quoted separately. The callout fee is included in the base price.
What Affects the Cost
- Clearing method. Electric eel or rod clearing runs $100–$300. High-pressure jetting costs $300–$600. CCTV adds $250–$550 for a diagnostic layer.
- Blockage depth and location. A basin trap blockage is quick. A blockage 15–20 metres down a sewer line requires longer equipment setup and more time.
- Tree root intrusion. Roots require jetting to cut through and typically return within 12–18 months without pipe repair or relining. Moreton Bay figs, Port Jackson figs, and large eucalypts are the worst offenders across Sydney's North Shore and Inner West.
- Shared drainage. Terraces and semis often share drain runs between adjoining properties, complicating access and responsibility for the blocked section.
- Access to inspection openings. Clear, accessible overflow relief gullies (ORGs) speed the job. Buried or concreted-over access points add time and cost.
- Pipe material. Pre-1980 clay (earthenware) pipes have joints every 600mm where roots enter. PVC pipes (standard from the mid-1980s) have fewer and tighter joints.
A grease blockage in a kitchen drain cleared with an electric eel in a newer Rouse Hill property sits toward $100. Recurring root intrusion in a 20-metre clay sewer line under mature figs in Mosman, requiring high-pressure jetting and CCTV investigation, pushes toward $800.
Blocked drains can escalate quickly when sewage backs up into showers or floor wastes. After-hours, weekend, and public holiday callouts carry significant premium rates. If only one drain is slow and there is no overflow, scheduling during business hours saves money. If sewage is backing up or multiple fixtures are affected, call immediately.
Sydney-Specific Considerations
North Shore and Inner West root intrusion. Sydney's established suburbs are heavily planted with Moreton Bay figs, Port Jackson figs, jacarandas, and large eucalypts. These trees have aggressive root systems that seek out moisture in sewer pipe joints. Suburbs like Mosman, Lane Cove, Willoughby, Chatswood, and across the Inner West (Marrickville, Dulwich Hill, Ashfield) have particularly high rates of root intrusion in pre-1980 vitrified clay pipes. The combination of mature council street trees and ageing earthenware drainage makes root-related blockages Sydney's most persistent drain problem. If you are clearing roots every 6–12 months, the pipe joints are compromised. A CCTV inspection ($250–$550) is worth the upfront cost to assess whether relining or replacement is needed rather than paying for annual jetting.
Inner-city terraces and shared drainage. Sydney's terrace rows in Paddington, Surry Hills, Darlinghurst, Glebe, and Balmain often share drainage systems between adjoining properties. A blockage in one terrace can back up into a neighbour's drains, and responsibility for the shared section can be disputed. Check your sewer service diagram (available from Sydney Water) to understand where your private drain ends and the shared or Sydney Water main begins. Property owners are responsible for all pipes from the house to the Sydney Water connection point, which may extend beyond the property boundary under footpaths or roads. Sydney Water clears main sewer blockages at no charge: call 13 20 90 if multiple properties are affected or overflow occurs at a Sydney Water maintenance hole.
Western Sydney new estates. Properties in newer developments like Oran Park, Marsden Park, and The Ponds have modern PVC drainage with minimal tree cover. These jobs are typically straightforward electric eel clearing at the lower end of the price range. The main risk in newer estates is construction debris left in drain lines from the building phase, which usually presents as a one-off blockage in the first few years.
Hiring a Licensed Plumber in NSW
All drain clearing and plumbing work in NSW must be carried out by a licenced plumber. Verify licences through NSW Fair Trading. For work involving sewer connections or stormwater modifications, ensure the plumber holds the appropriate drainer endorsements. NSW plumbers must issue a Certificate of Compliance for notifiable drainage work, including new connections and pipe repairs.
Worth checking:
- Current NSW plumbing licence (verify the licence number online before booking)
- Public liability insurance
- Written quote specifying the clearing method, whether CCTV is included or quoted separately, and any additional charges for access difficulties
- A good plumber will inspect access points on site before quoting, not diagnose and price over the phone
How We Calculate
Estimates are based on current licenced plumber rates in the Sydney metropolitan area, adjusted for typical property age and drainage infrastructure in NSW. All figures include GST. Prices cover standard residential drain clearing. Commercial, strata common property, or council drainage issues may fall outside these ranges.