Quick Answer

Most blocked drains in Melbourne homes can be cleared DIY using a plunger ($15–$25), a drain snake ($20–$80), or a boiling water and bicarb flush — for zero cost. If DIY fails, a plumber charges $180–$350 to clear a blocked drain, or $400–$900 for a camera inspection plus high-pressure water jetting. Try the DIY methods first — they resolve 80% of household blockages.

What You’ll Need

Tool / Material Cost Where to Get It
Cup plunger (flat bottom) $15–$25 Bunnings, Mitre 10, most hardware stores
Flange plunger (for toilets) $20–$35 Bunnings, Reece Plumbing
Drain snake / auger (manual) $20–$60 Bunnings, hardware stores — or hire from Total Tools
Bicarb soda (500g) $2–$4 Any supermarket
White vinegar (1 litre) $2–$4 Any supermarket
Rubber gloves $5–$10 Supermarket or hardware store
Bucket $5–$15 Any hardware store
Drain cleaning gel (e.g. Draino Max) $10–$18 Supermarkets, Bunnings — use sparingly

Step-by-Step: Clearing a Blocked Drain

Step 1: Identify Which Drain Is Blocked

Is just one fixture blocked (one basin, one shower), or are multiple drains slow or gurgling? A single blocked fixture is almost always a local blockage — hair, soap, or debris in the trap directly below the drain. Multiple slow drains or gurgling from different fixtures signals a blockage further down in the main sewer line — a more serious problem requiring a licensed plumber with camera equipment.

Also check: Is there any sewage smell coming from the drain? That can indicate a dry trap (easy fix — pour water down unused drains to refill the trap) or a sewer line issue.

Step 2: Try the Plunger First

A plunger resolves the majority of sink, shower, and bath blockages. Technique matters more than force:

  1. For a basin: block the overflow hole with a wet cloth to create a sealed system
  2. Cover the drain opening completely with the plunger cup
  3. Push down slowly to expel air, then pull up sharply — repeat 10–15 times
  4. On the final stroke, pull the plunger off quickly to create a vacuum burst
  5. Run water immediately to check if the drain is clearing

Step 3: Remove and Clean the P-Trap

If plunging fails, the blockage is likely in the P-trap — the U-shaped pipe under your sink. Place a bucket under the trap, unscrew the slip-joint nuts by hand (or with a 300mm adjustable spanner), and pull the trap out. Clean any hair or soap scum from inside the trap and refit. This fixes 90% of persistent basin blockages in Melbourne homes.

Step 4: Use a Bicarb Soda and Vinegar Flush

For slow drains that aren’t fully blocked, or after clearing the trap, this helps dissolve soap and grease buildup:

  1. Pour half a cup of bicarb soda down the drain
  2. Follow immediately with half a cup of white vinegar
  3. Cover the drain to force the reaction down into the pipe
  4. Wait 30 minutes, then flush with a full kettle of boiling water

Note: Don’t use boiling water in PVC pipes or on porcelain fixtures — use very hot tap water instead. PVC is common in SE Melbourne homes built from the 1970s onward.

Step 5: Use a Drain Snake (Auger)

For blockages the plunger and trap cleaning can’t clear — typically compacted hair, a foreign object, or a partial root intrusion in older homes. Feed the snake into the drain opening and turn the handle clockwise as you push it forward. When you feel resistance, work the snake back and forth to break up or hook the blockage. Pull out slowly and dispose of the retrieved material.

Step 6: Try a Chemical Drain Cleaner (Last Resort)

Chemical drain cleaners like Draino Max or CLR work on hair and organic blockages. Follow the label instructions and use sparingly — they can damage rubber seals and older pipes, and are hazardous chemicals. Never mix with other cleaners or bleach. Always wear rubber gloves and eye protection.

Safety warning: Never use chemical drain cleaner if the drain is completely blocked and water is standing — the caustic liquid will sit in the drain without moving and can splash back when disturbed. Use mechanical methods (plunger, snake) first for full blockages.

Troubleshooting Table

Problem Likely Cause Best Fix
Single basin drains slowly Hair/soap scum in P-trap Remove and clean P-trap by hand
Shower drain fully blocked, water pooling Compacted hair at drain cover Remove drain cover, pull out hair manually, plunge
Toilet won’t flush properly Partial blockage in toilet trap Flange plunger — 10–15 firm strokes
Multiple drains gurgling simultaneously Main sewer line blockage Call a licensed plumber — camera inspection needed
Sewage smell from drain Dry trap or sewer line problem Pour water down unused drain first; call plumber if persists
Blocked drain returns within days Root intrusion or pipe damage Licensed plumber with camera + water jetting

When to Call a Licensed Plumber

Call a plumber immediately if:

  • Multiple drains are slow or blocked simultaneously — this indicates a main sewer line problem, not a fixture blockage
  • Sewage is backing up into your shower or bath when you flush the toilet — a serious sewer blockage
  • You’ve tried all DIY methods and the drain is still blocked
  • The drain was clear, then blocked again within a few days — likely tree root intrusion in older Melbourne homes (pre-1980 clay pipe systems are common in Dandenong, Berwick, Narre Warren)
  • You can hear gurgling from floor drains or other fixtures when water runs elsewhere
Pro tip: In SE Melbourne’s older suburbs, clay sewer pipes (common pre-1985) are highly susceptible to root intrusion from established trees — gum trees especially. If you have a recurring blocked drain in a home with large garden trees, budget for a camera inspection ($300–$500) to check if root clearing and pipe relining is needed.

Plumber Call-Out Costs in Melbourne

Job Cost Notes
Call-out + clear a single blocked drain $180–$350 Most common blocked drain job
CCTV camera drain inspection $300–$500 Identifies root intrusion, pipe damage, blockage location
High-pressure water jetting $250–$500 Clears compacted grease and root intrusion in the pipe
Camera inspection + jetting $500–$900 Full diagnosis and clear — recommended for recurring blockages
Pipe relining (per metre) $200–$500/m Fixes cracked or root-damaged pipes without excavation

Top 10 Tips and Gotchas

  1. Pull hair from shower drains weekly. The most common cause of blocked drains in Melbourne homes is hair accumulation at the drain cover. Pull it out by hand once a week — it takes 10 seconds and prevents 90% of shower drain blockages.
  2. Never pour cooking grease down the sink. Grease solidifies in cool pipes and traps food particles, building up over months. Collect grease in a jar and dispose of it in the bin.
  3. Don’t flush “flushable” wipes. Despite the label, wet wipes don’t break down in Australian sewer systems and are a major cause of main drain blockages. Bin all wipes, regardless of what the packet says.
  4. Use a drain hair catcher. A $5–$15 silicone hair catcher in the shower drain is the cheapest and most effective blocked drain prevention available. Replace it when full.
  5. Cold water when running the garbage disposal. Always run cold water during and for 30 seconds after using a food waste disposer — cold water solidifies fats so they travel through the pipe as solids rather than coating the walls.
  6. Plunge before you pour chemical. Chemical cleaners work on partial organic blockages but are ineffective on compacted hair or foreign objects. Always try mechanical methods first.
  7. Check tree root risk. In SE Melbourne suburbs with established trees (Berwick, Narre Warren, Frankston), ask a plumber to check your sewer pipe condition if your home is pre-1990 and you have recurring blockages. Root intrusion is far cheaper to fix early than after a full pipe collapse.
  8. Don’t overtighten P-trap slip joints. Hand-tighten P-trap slip joints only — overtightening cracks the plastic nuts. If they leak after reassembly, add a little plumber’s tape and re-tighten by hand.
  9. Keep the outdoor drain clear. External floor drains (in patios, garages, driveways) block with leaves and clay soil in Melbourne’s wet winters. Lift the grate and clear debris every few months.
  10. Act fast on multiple blocked drains. Multiple blocked drains simultaneously is a plumbing emergency. Don’t use any water until a plumber has assessed the main line — sewage backing up into showers or baths is a health hazard.

Local Melbourne Resources

Frequently Asked Questions

How do I know if my blocked drain is a DIY fix or needs a plumber?

If only one fixture is affected (one basin, one shower), it’s almost certainly a local blockage you can fix yourself with a plunger or by cleaning the P-trap. If multiple drains are slow or gurgling at the same time, or sewage is backing up anywhere, that’s a main sewer line problem — stop using water and call a licensed plumber immediately.

Can I use Drano or chemical drain cleaner in my pipes?

Chemical drain cleaners are a last resort, not a first response. They’re corrosive and can damage rubber seals, chrome fittings, and older PVC pipes with repeated use. They’re also ineffective on full blockages where water isn’t moving. Use a plunger and drain snake first. If you do use a chemical cleaner, follow label directions exactly, ventilate the room well, and wear rubber gloves and eye protection.

Why does my drain keep blocking every few months?

Recurring blockages in the same drain usually mean the blockage was never fully cleared, or there’s an underlying problem like tree root intrusion, a misaligned pipe, or scale buildup in older pipes. In SE Melbourne homes pre-1985, clay sewer pipes are common and highly susceptible to root intrusion from established gum trees. A CCTV drain camera inspection ($300–$500) will tell you exactly what’s happening inside the pipe.

Is there a risk of damaging pipes by using a drain snake yourself?

A manual hand snake used carefully rarely damages pipes. The risk comes from using a motorised auger without experience — these can crack old clay pipes or damage P-traps if pushed too hard. For most household blockages, a manual snake (push and rotate by hand) is sufficient and safe. If you encounter very firm resistance that won’t budge, stop and call a plumber rather than forcing it.

Final Thoughts

Most blocked drains in Melbourne homes are DIY-fixable in under an hour. Start with a plunger, move to the P-trap, then try a snake. Chemical cleaners are a last resort. If DIY fails, or if multiple drains are affected, call a licensed plumber — the average Melbourne call-out for a blocked drain is $180–$350, and most are cleared in under an hour.

  • Install hair catchers in all shower drains — the most effective prevention
  • Never pour grease or wipes down any drain
  • Try plunger → P-trap clean → snake before spending money on a plumber
  • Multiple blocked drains = plumber call, not DIY territory
  • Pre-1985 SE Melbourne homes: get a camera inspection if blockages recur