10 Common Causes of Blocked Drains and How to Fix Them

Drain Plumber in Brisbane

A blocked drain is one of the most common causes for concern when it comes to plumbing and, while not usually serious, can cause you quite the headache and mean your water system is out of action for a day or even a week.

Here at Same Day Trades, we’ve put together a full guide to the most common causes of blocked drains and how to fix them.

1. Tree roots penetrating a cracked pipe

When there are cracks or structural damage to a pipe, sometimes the root systems of a tree can grow through these. This will cause a blockage within the pipe that impedes or even halts the natural flow.

To fix this issue, you should use a jet rodding machine. These high-pressured hoses blast through your blocked plumbing lines to clear the tree root obstruction.

2. Matted hair in the shower drain

It’s normal to shed a little (or a lot) of hair in the shower. However, this can quickly become an issue for the drain in your shower or bath for large households or homeowners with long or curly hair. When hair mats in the drain, it can slow and cut off water flow completely.

To fix this, you should pull out what hair you can and dissolve the rest with a solution made up of ½ cup of baking soda, ¼ cup of table salt and 1 cup of heated vinegar.

3. Food scraps in the kitchen sink

When washing your dishes in the sink, you should always put food scraps into the bin, compost, or use another sustainable and renewable method of waste disposal. If these food scraps are just washed away into the kitchen sink, they can clog up the U-bend and swell.

To fix this, pour the drain unblocker down the sink. Occasionally, you may need to go to the external drain outside where it empties and clear the food out of there too.

4. The build-up of oils and fats

‘Fatbergs’ are formed by the solidification of oils and fats. These enter the pipes as liquids and solidify into masses in the winter and colder temperatures. In the national network, these can cost thousands of dollars to remove.

To prevent these in your home, soak oils and fats with a kitchen roll and deposit them in a bin – not down the sink.

5. Wet wipes and un-flushable

Many wet wipes are being falsely marketed as flushable. Often, this is not the case. We recommend that, regardless of the packaging, you never flush a wet wipe down the toilet because they cannot break down the same way that toilet paper does and often cause blockages. The same goes for sanitary products, cotton buds, and other toiletries.

6. Leaves collecting in the outside drain

During autumn, leaves can collect in the dips where your drains empty into the ground outside. To fix a blockage here, remove the leaves and consider putting a wire cover over the drain to prevent this from continuing in future.

7. A build-up of coffee grounds

These, like fat, solidify and harden when washed down the drain. This will narrow the pipe and cause it to block completely. Remove with a drain unblocker and empty coffee grounds into compost or a household bin.

8. Poor installation

Sometimes, when installers cut corners, you may be left with too small or too narrow pipes. These will be prone to blocking and could cost you more money in the long run. Unfortunately, the only way to fix this issue is to have a professional plumber come in and reinstall your pipes.

9. Children’s toys and other inanimate objects

Anyone with small children in their lives is probably familiar with the panicked rush of pulling a truck or a doll out of the toilet before it disappears into the U-bend. These are one of the leading causes of damage to or blocking drains.

To fix these, you might need to take apart the system and remove the object yourself or call in a plumber. Always keep a child lock on the door and make sure drains and plugholes are inaccessible to small children.

10. Damage to sewer and external pipes

This includes construction work, extreme weather, and wear and tear. Usually, these issues will be rectified by your local council, but otherwise, you should consult them and their in-house plumber to ensure that your area has unblocked drains.

If the damage is local to your property, you should contact a reputable plumber to resolve the problem.

Get in touch with Same Day Trades today for all your plumbing needs and drain enquiries. Our local plumbing experts service all of Adelaide, Brisbane and Melbourne.

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Sue Burcham profile pictureSue Burcham
01:53 02 Jan 26
Jacob B was a delightful, polite and informative plumber and was very clear about costs and options before replacing my leaking tap. I appreciated his professional manner, efficiency and that he cleaned up after himself. Very grateful.
K Bartolay profile pictureK Bartolay
01:22 02 Jan 26
We are happy with the initial work done today by Tyrell. He arrived on time, quickly assessed the issue, and start the initial work on our kitchen sink. He is good at what he does and goes above and beyond to help his client.
Ken Fisher profile pictureKen Fisher
07:56 29 Dec 25
Daniel came out 24/12/25 and gave quote on work required couldn’t do work due to mains tap not turning off completely I called water corp they came out and replaced mains tap valve l then contacted Daniel and he made booking for Monday 28/12/25 Luke came out and did work and left work area clean and tidy Job well done and l am very happy with work done and would recommend these guys anytime
Kimball Copeland profile pictureKimball Copeland
12:17 20 Dec 25
Jacob did a fantastic job. The work was completed cleanly and in a timely manner, and he was polite and professional throughout. Highly recommend.
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Cameron, Luke, Tyson and Anton were all amazing. Removed our old air conditioner and replaced it within two hours. Went above and beyond. Would highly recommend!
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I’m so happy with the worked completed by James, I would recommend him to anyone. He made an easy to understand quote. He arrived in a timely manner and was very thorough. He even helped reset my dad’s VHS, so he could watch his old German videos. James went above and beyond our expectations.
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Love the same day service. Lovely staff who communicated well. It was great to overhear the tradesman teaching the apprentice in a kind, helpful and respectful manner. 100% happy.
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Nick is a good tradesman he was on time explained what was needed and how to future proof the work for years ahead and was in accordance with mutual agreement by everyone including my parents.
Overall fast and efficient and courteous happy with the service , thanks , good job by the way the telephonists were helpful too.
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The boys did an awesome sleuthing job and found our leak ! Thrilled cos we were leaving for away and were totally stressed put! Very lovely quick and professional! Highly recommend Daniel and his team!
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Matt did a fantastic job fixing my switchboard
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I can not fault the service we have received today and over the last couple of years. From the quoting process to the job being completed; the tradies have been polite, female friendly and provide a high standard of work. They even clean up after themselves! Thank you Nick for your work and quote today. We most certainly will be seeking Same Day Trades expertise again.
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From my phone call for your services was Good
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Hi Nigel,Thank you for your kind words! We're glad to hear your experience—from the initial phone call to the completion of the job—was a positive one. Great communication and quality service are what we strive for, and we’re happy we could help. If you ever need plumbing or electrical work in the future, please don’t hesitate to contact us!Kind Regards,Same Day Trades
Neil John4 profile pictureNeil John4
04:25 11 Jul 25
Flynn and Dylan were both very friendly and very efficient. When the work was completed, they explained the changes clearly. Very Good!
Response from the owner 05:01 11 Jul 25
Hi Neil,Thank you for your great feedback! We're so pleased to hear that Flynn and Dylan were both friendly and efficient, and that they took the time to clearly explain the work once it was completed. We really value your support! If you ever need plumbing or electrical work in the future, please don’t hesitate to contact us!Kind Regards,Same Day Trades
Joy Schofield profile pictureJoy Schofield
02:26 11 Jul 25
Jacob & Ben pleasant helpful, efficient service. Thankyou
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Hi Joy,Thank you for your kind words! We're glad to hear Jacob and Ben provided pleasant, helpful, and efficient service. We really appreciate you taking the time to share your experience. If you ever need plumbing or electrical work in the future, please don’t hesitate to contact us!Kind Regards, Same Day Trades
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Lachlan and his team did an excellent job installing my new hot water system, from the initial meeting to the completion of the job, Lachlan and his team were friendly and professional in their field of work, having changed from gas to electric hot water, Lachlan and his team removed all the old gas lines and cleaned up the remaining lines to leave a clean finish, very happy with the service, if you need a new hot water system, gas or electric, I highly recommend samedaytrades.
Response from the owner 03:42 11 Jul 25
Hi Rowland,Thank you so much for your fantastic feedback! We're thrilled to hear you had such a positive experience with Lachlan and the team. From the initial consultation to the final clean-up, it's great to know our team's professionalism and attention to detail made the transition from gas to electric hot water seamless for you. We truly appreciate your recommendation – it means a lot to us. If you ever need plumbing or electrical work in the future, please don’t hesitate to contact us!Kind Regards,Same Day Trades
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06:34 10 Jul 25
Thank you Matt for fixing our fly screen door and for coming out so quickly!
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05:06 10 Jul 25
Matt M from Same Day Trades arrived on time and sorted out our blocked sewage problem in a very friendly and efficient manner. Great service which was much appreciated.

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