A new fence feels like a simple project until you are halfway through it and realise something has gone wrong.
The post is in the wrong spot. The neighbour is not happy. The material you chose looks nothing like you expected once it is up. Or worse — the council sends a notice because the installation did not meet local regulations.
Fence installation Sydney trips up a lot of homeowners — not because they are careless, but because there are more things to get right than most people realise before they start.
This guide covers the most common mistakes made during residential fence installation in Sydney and what you can do to avoid each one.
Mistake 1: Not Checking Your Property Boundary Before You Start
This is the one that causes the most arguments between neighbours — and it is almost always avoidable.
A lot of homeowners assume they know where their boundary sits. They go by a rough estimate, match up with a fence that is already there, or eyeball it from the street. Then the fence goes in, and it turns out it is sitting 20 centimetres inside the neighbour’s property — or 20 centimetres into the footpath.
Before any fence goes in, get your property boundaries confirmed. Your Certificate of Title has the legal measurements. If there is any doubt, a licensed surveyor can peg the boundaries accurately. It is a small upfront cost compared to the cost of taking a fence down and reinstalling it.
In Sydney, fencing on or near a shared boundary also involves neighbour notification requirements under the Dividing Fences Act. Skipping that process can lead to disputes and delays that set a project back by weeks.
Mistake 2: Ignoring Council Regulations and Development Rules
Not every fence in Sydney needs council approval — but some do, and getting this wrong can result in fines or being required to remove and redo the work entirely.
In general, fences under a certain height in residential areas are considered exempt development in NSW, meaning they do not need a formal development application. But the rules change depending on your zone, your street frontage, heritage overlays, and the type of fence material.
Front boundary fences often have stricter height and material requirements than side or rear fences. Corner blocks have additional sight line rules. Properties in heritage conservation areas have their own set of guidelines.
The safest approach is to check with your local council before committing to a design or material. At A2Z Landscaping and Fencing, we assess compliance as part of the consultation process so you are not caught out later.
Mistake 3: Choosing the Wrong Material for the Purpose
Sydney homeowners often choose fencing material based on what looks good in a photo — without thinking through how that material will actually perform in their specific situation.
Timber looks great. But in a low-lying backyard that holds moisture, or in a spot with constant direct sun and minimal airflow, untreated timber will warp, crack, and deteriorate faster than expected. It needs regular maintenance to stay in good shape.
Colorbond is one of the most popular choices in Sydney for good reason — it handles the Australian climate well, requires minimal upkeep, and gives a clean, modern finish. It suits most residential applications and holds up in heat, rain, and coastal conditions.
Aluminium is lighter and works well for decorative garden fencing where structural weight is not the priority.
For construction sites or areas with erosion risk, silt and sediment fence installation is a completely different category. These fences are designed to manage runoff and comply with environmental regulations on building sites — they are not the same product as a boundary or garden fence, and they need to be installed to specific standards.
The point is: the right material depends on what the fence needs to do, where it will sit, and what conditions it will face. Getting advice from people who understand Sydney’s climate and local requirements before you order saves a lot of trouble.
Mistake 4: Skipping the Post Depth and Concrete Footings
A fence is only as strong as what holds it in the ground.
One of the most common shortcuts in DIY and low-cost fence jobs is posts that are not set deep enough, or footings that are underfilled or left to cure too quickly. The fence looks fine when it first goes up. Then the first decent wind arrives, or the ground shifts slightly in summer heat, and the posts start to lean.
As a general rule, fence posts should be set to a depth of roughly one third of their total length — more for taller fences or in areas with loose soil. Concrete footings need to be properly mixed and allowed to cure fully before the fence panels are attached.
In Sydney’s western suburbs, including areas like Oakhurst, clay-heavy soil expands and contracts with moisture changes. This puts additional stress on posts over time. Getting the footings right from the start is what keeps the fence straight and stable for years.
Mistake 5: Not Accounting for Drainage and Slope
Sydney properties are rarely flat. Sloped ground, drainage channels, and stormwater paths all affect how a fence should be installed — and a lot of homeowners do not think about this until after the job is done.
If a fence is installed across a natural drainage path without proper consideration, you can end up with water pooling against the base of the fence. Over time, this causes the base of timber posts to rot, Colorbond panels to sit in standing water, and the ground around footings to erode.
On sloped blocks, fences need to either step down in sections or be raked to follow the fall of the land. Both approaches work — but they need to be planned before installation, not figured out halfway through.
A proper site assessment before installation starts is what catches these issues early.
Mistake 6: Underestimating What the Job Actually Involves
Fence installation looks straightforward from the outside. It is not.
Between marking boundaries, digging post holes, setting and levelling posts, mixing and pouring footings, cutting and fitting panels, and finishing edges — a proper fence installation involves a full day’s work at minimum for a standard residential job, and several days for anything larger or more complex.
DIY fence jobs in Sydney often run into problems with post alignment, uneven panel heights, or fixings that are not secure enough for the fence type. These issues are not always visible immediately, but they show up over time.
Getting a professional team in from the start — one that handles consultation, material selection, installation, and cleanup — means the job gets done properly the first time without the back and forth of fixing problems after the fact.
Mistake 7: Forgetting About Access and Gates
It sounds obvious, but gates are often an afterthought in fence installation planning — and then become the most-used and most-problematic part of the whole setup.
Gate width needs to account for what actually needs to pass through it. A standard pedestrian gate is usually around 900mm to 1 metre wide. If you need to get a wheelbarrow, a ride-on mower, or a vehicle through, the opening needs to be planned for that from the start.
Gate hardware — hinges, latches, and closers — needs to match the weight and size of the gate. A heavy Colorbond gate on undersized hinges will sag within months. Pool gate latches need to meet specific child safety requirements under Australian law.
Plan the gate positions before installation starts, not as an add-on after the fence is in.
FAQs
Do I need council approval for fence installation in Sydney?
Not always. In NSW, many residential fences are considered exempt development if they meet height and setback requirements. But rules vary by zone, street type, and materials. Always check with your local council or consult a professional before starting.
How deep should fence posts be set in Sydney soil?
As a general guide, posts should be set to approximately one third of their total length. In clay-heavy soils common in western Sydney, deeper footings and quality concrete are especially important for long-term stability.
What fencing materials work best in Sydney’s climate?
Colorbond steel is one of the most popular and practical choices for Sydney homes — it handles heat, moisture, and UV exposure well with minimal maintenance. Timber is also widely used but requires regular treatment to stay in good condition, particularly in areas with high moisture or direct sun.
Does A2Z Landscaping and Fencing handle the full installation process?
Yes. A2Z Landscaping and Fencing provides end-to-end service from initial consultation and material selection through to installation and site cleanup. You do not need to manage multiple contractors.
Final Thoughts
Most fence installation mistakes in Sydney come down to the same things: rushing the planning, skipping the checks, or underestimating what proper installation actually involves.
Getting the boundary right, choosing the right material, setting posts properly, and understanding the council rules in your area are not complicated steps — but they need to happen before work starts, not after something goes wrong.
If you are planning fence installation in Sydney and want it done properly from the start, get in touch with us at A2Z Landscaping and Fencing based in Oakhurst, NSW. Call us on +61 435 820 048 or get a free quote online.