Louvre · Complete kit
Louvre Fence Extension Kit – 300 mm
Complete DIY kit to add 300 mm to one Colorbond fence panel with an aluminium louvre insert – privacy with airflow.
From $192$218
Supply only · DIY kits · Australia-wide delivery
Colorbond fence height extension kits
Add 300 mm or 600 mm to your existing Colorbond fence without replacing it. Complete DIY kits from $125 per panel – choose your length, post profile and colour, see live freight for your suburb and pay securely online.
- Genuine Colorbond® steel frames · Australian-made aluminium inserts
- Live courier quotes (Shippit) or free pick-up in Sydney's west
- Card (Stripe) or PayPal · prices include GST
How to install a Colorbond fence extension – and what comes in the DIY kit
300 mm extension kits
The most popular height – enough to block a neighbour's line of sight from a deck or window. One kit per fence panel.
Lattice · Complete kit
Lattice Fence Extension Kit – 300 mm
Complete DIY kit to add 300 mm to one Colorbond fence panel with a diamond-stamped steel lattice insert – the classic Colorbond topper.
From $158$180
Slat · Complete kit
Slat Fence Extension Kit – 300 mm
Complete DIY kit to add 300 mm to one Colorbond fence panel with a horizontal aluminium slat insert – a clean, modern look.
From $190$200
Solid sheet · Complete kit
Solid Sheet Fence Extension Kit – 300 mm
DIY kit to add 300 mm of solid Colorbond sheet to one fence panel – full privacy that matches your existing fence. Supplied in component form.
From $125$144
600 mm extension kits
Maximum privacy from two-storey neighbours. Check your council's fence height limit first – most Sydney councils allow 1.8 m boundary fences without approval, higher usually needs consent.
Louvre · Complete kit
Louvre Fence Extension Kit – 600 mm
Complete DIY kit to add 600 mm to one Colorbond fence panel with an aluminium louvre insert – maximum privacy from two-storey neighbours.
From $283$350
Lattice · Complete kit
Lattice Fence Extension Kit – 600 mm
Complete DIY kit to add 600 mm to one Colorbond fence panel with a diamond-stamped steel lattice insert.
From $221$241
Slat · Complete kit
Slat Fence Extension Kit – 600 mm
Complete DIY kit to add 600 mm to one Colorbond fence panel with a horizontal aluminium slat insert.
From $360$388
Solid sheet · Complete kit
Solid Sheet Fence Extension Kit – 600 mm
DIY kit to add 600 mm of solid Colorbond sheet to one fence panel – full privacy that matches your existing fence. Supplied in component form.
From $140$160
Inserts only & complete panels
Replacing a damaged insert, or building your own extension? Buy the insert alone. The 420 mm Charcoal panel is a complete 1.8 m extension panel.
Louvre · Insert only
Louvre Fence Extension Insert
Aluminium louvre insert only – for replacing an insert or building your own extension. Rails and post extensions are not included.
From $139
Lattice · Insert only
Lattice Fence Extension Insert
Diamond-stamped steel lattice insert only – for replacing an insert or building your own extension. Rails and post extensions are not included.
From $87
Slat · Insert only
Slat Fence Extension Insert
Aluminium horizontal slat insert only – for replacing an insert or building your own extension. Rails and post extensions are not included.
From $115
Complete panel · Complete kit
Colorbond Fence Extension Panel – 420 mm (Charcoal)
Complete 1.8 m extension panel with a sheet-metal insert, two post extensions, top rail and screws. Charcoal only.
From $188$210
Also available by enquiry: Colorbond fence extension posts on their own, and full Colorbond fence panels and gates.
Step 1: match your post profile
Colorbond fence posts (C-posts) come in three shapes – A Lysaght, B Slimline and C Standard (double-ribbed). The extension post slides over your existing post, so it must be the same profile to sit neatly and screw off securely. Look at the top of one of your posts from above and compare it with the diagram.
- A – Lysaght: Flat-faced post with a square top and a single wide channel. Common on older Lysaght-brand fences.
- B – Slimline: Narrow post with small, closely spaced ribs. Common on newer fences in NSW.
- C – Standard (double-ribbed): Wider post with two pronounced ribs on each face. The most common profile in Sydney.
- D – Not sure – match it for me: Choose this and email a close-up photo of the top of one post to [email protected] after ordering. We match the extension post for you at no extra cost.
Extensions also rely on the existing posts and footings being sound. If a post is loose or rusted at the base, an extension is not the right fix – we can repair it first.
Step 2: choose your Colorbond colour
Every kit comes in the full Colorbond fencing range at the same price, and the frame can be a different colour to the insert. Other suppliers use older or alternative names – they are listed under each colour on the kit pages so you can match what you already have.
- MonumentDark Grey
- Woodland GreySlate Grey, Grey Ridge
- DomainPrimrose, Classic Cream, Smooth Cream
- Night SkyBlack, Eclipse, Ebony
- SurfmistOff White, Frost, White
- Basalt
- Deep OceanMountain Blue, Bluestone, Blue
- BoundaryBrown, Bowral Brown, Mission Brown
- Manor RedRed, Heritage Red, Indian Red, Red Oak
- Cottage GreenDark Green, Caulfield Green, Evergreen
- Pale EucalyptMist Green, Meadow, Light Green
- WildernessRivergum, Willow
- BushlandTeatree, Gun Metal Green
- BrushwoodPicton Green, Olive Green, Khaki
- RiversandBeige, Stone
- PaperbarkMerino, Terrace
- HarvestWheat
- Evening HazeSummershade, Moss Vale Sand
- WindsprayArmour Grey, Grey Haze
- EstateIronbark
- Jasper
- Dune
- Gully
- Shale Grey
- Wallaby
- Ironstone
- Zincalume (unpainted)Galvanised, Zinc Silver, Bare Metal
Screen colours are a guide only. See the full colour chart or ask us for a sample.
Two ways to get your extension
DIY kits delivered or picked up
- Pick a kit and configure height, length, post profile and colour.
- Add to cart – enter your suburb for live courier quotes, or choose free pick-up.
- Pay by card or PayPal. We make your order and deliver within about 14 days.
We install it across Sydney
- Tell us the number of panels, the height you want and your suburb.
- Send a photo of a post top if you can – we confirm compatibility.
- We reply with a supply-and-installation price; book a date once you are happy.
Delivery, pick-up and returns
Courier delivery: at checkout we fetch live quotes from our freight partners via Shippit for your suburb and show each service with its price and estimated transit time. Panels travel as long parcels (2.4 m or 3.1 m), so not every courier can carry them to every area – if no quote is available we will arrange freight manually, just call us.
Pick-up: Collect from our Blacktown-area depot once your order is ready. We email you when it is ready to collect – usually within 14 days of payment, sooner for stocked 300 mm inserts.
Lead time: We aim to deliver within 14 days of full payment. Limited stock of 300 mm inserts can be delivered or collected sooner.
Returns: As materials are made to order, we do not offer refunds or exchanges for incorrect choice. Please make sure the post profile, length, height and colours match your existing fence before paying – if you are unsure, choose 'Match it for me' or email a photo of a post top to [email protected] first.
Fence extensions we have installed
Extension kit questions
What comes in a DIY fence extension kit?
Each kit extends one fence panel: two Colorbond C-post extensions that slide over your existing posts, a new top rail, your chosen insert (louvre, lattice, slat or solid sheet) and a bag of colour-matched screws. Sheet kits include two rails and an uncut 1.8 m sheet.
How do I choose the right kit?
Pick the height you want to add (300 mm or 600 mm), the look (louvre for privacy with airflow, lattice for the classic topper, slat for a modern look, sheet for full privacy), then match the panel length to your bays (2.36 m standard, 3.1 m extended), the post profile and your Colorbond colour.
How much is delivery?
Delivery is quoted live at checkout by our freight partners (via Shippit) for your suburb – you see each courier's price and estimated transit time before paying. Long panels are oversize freight, so regional prices vary. Pick-up in Sydney's west is free.
How long until I receive my order?
We aim to deliver within 14 days of full payment. Limited stock of 300 mm inserts can be delivered or collected sooner.
Can I return a kit if I ordered the wrong profile?
As materials are made to order, we do not offer refunds or exchanges for incorrect choice. Please make sure the post profile, length, height and colours match your existing fence before paying – if you are unsure, choose 'Match it for me' or email a photo of a post top to [email protected] first.
Do you install extensions?
Yes, across Sydney. Every kit page has a 'supply + install quote' button – tell us the number of panels and we reply with a price. Installation is quoted separately and is not part of the online checkout.
Not sure which kit you need?
Email a photo of a post top and your fence length to [email protected], or call 0421 233 434 – we will tell you exactly what to order.