Louvre extensions
Privacy with airflow. Our most popular extension.
Fence extension specialists
Colorbond fence height extensions
Need more privacy from a neighbour's deck, window or two-storey extension? A 300 mm or 600 mm height extension fits to your existing Colorbond posts – no new fence required. Installed across Sydney, or supplied as a DIY kit Australia-wide.
Four ways to extend
All four use the same construction – post extensions matched to your existing post profile, a new top rail and an insert. The insert is what changes the look and the amount of light and air that passes through.
Lattice extensions
Classic diamond lattice topper in Colorbond steel.
Slat extensions
Modern horizontal aluminium slats.
Solid sheet extensions
Full privacy with matching Colorbond sheet, any height.
Will it fit your fence? Five things we check
- Post profile must match. Colorbond C-posts come in three profiles – Lysaght, Slimline and Standard (double-ribbed). The extension post slides over or fixes to the existing post and has to be the same profile. Look at the top of a post or send us a photo.
- Posts and footings must be sound. An extension adds height, weight and wind load. If posts are loose, rusted at ground level or the concrete has cracked, extending is not the right fix – we will tell you and quote a repair or replacement instead.
- Total height may need approval. A 1.8 m fence extended by 300 mm becomes 2.1 m, and by 600 mm becomes 2.4 m. Fences over 1.8 m generally need council approval in NSW; heritage-listed properties always do. Check with your council before you order.
- Shared boundary? An extension changes your neighbour's side too. Talk to them first – under the Dividing Fences Act you generally cannot compel a neighbour to pay for a fence higher than a 'sufficient' dividing fence, so extensions are usually paid for by the person who wants them.
- Not every fence suits every extension. Louvre and slat inserts are lighter than solid sheet; a 600 mm solid sheet extension on a long, exposed run adds significant wind load. We assess this on site.
Match the top of your post to one of these three profiles. Not sure? Send us a photo.
How an extension is built
- Existing post caps are removed and the extension posts are fitted over or against the existing C-posts, fixed with colour-matched screws.
- A new top rail is fitted between the extension posts and the insert (louvre, lattice, slat or sheet) sits in the frame – exactly the same construction as the top of a new insert fence.
- Kits are supplied in component form. Sheet inserts for 600 mm extensions come in uncut lengths and need cutting to size.
- We install extensions across Sydney and supply kits Australia-wide. Installation instructions are available for DIY kits – but if you are unsure about the condition of your posts, have us look first.
We do not publish structural DIY instructions online. If you buy a kit, installation notes are supplied with it; if your posts are in doubt, have us look first.
Before and after: extensions we have installed
Two ways to get your extension
Buy a DIY kit online and fit it yourself, or have us supply and install it – we quote installation manually once we know your panels.
DIY extension kits from $125 per panel
Configure height, length, post profile and Colorbond colour, see live courier quotes for your suburb (or pick up free in Sydney's west) and pay by card or PayPal. Delivered Australia-wide.
Shop extension kitsWe measure, supply and install
Tell us the number of panels, the height you want and your suburb – send a photo of a post top if you can. We reply with a supply-and-installation price and arrange a free site look if the posts need checking.
Get a supply + install quote
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
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
How to install a Colorbond fence extension
Our video shows what comes in a DIY kit and how the post extensions, rail and insert go together on an existing Colorbond fence. Kits come with installation notes; if your posts are in doubt, have us look first.
How to install a Colorbond fence extension – and what comes in the DIY kit
Fence extension questions
Will an extension fit my fence?
If your fence is Colorbond with sound posts and footings and you know the post profile (Lysaght, Slimline or Standard), almost certainly. Send a photo of a post top and the number of panels and we will confirm before anything is ordered.
300 mm or 600 mm?
300 mm is the most common – it takes a 1.8 m fence to 2.1 m, enough to block a neighbour's window or deck line. 600 mm takes it to 2.4 m, the maximum we build, and is usually reserved for privacy from two-storey homes. Both heights normally need council approval.
Do I need council approval?
In most NSW councils a boundary fence over 1.8 m needs approval, so most extensions do. Some councils allow slightly higher fences as exempt development in certain circumstances – check your council's rules or ask us what we have seen in your area. We do not guarantee that an extension is permissible at any given property.
Can I extend a timber fence?
Our extension kits are designed for Colorbond C-posts. Timber fences are usually better replaced, or we can quote a new Colorbond fence with an insert top.
How long do custom extension panels take?
Generally one to two weeks from ordering the material. Primrose and Woodland Grey louvres are stocked colours.
What is in a kit?
Two C-post extensions, one rail, one insert (louvre, lattice, slat or sheet) and a bag of colour-matched tek screws – one kit per existing panel.
Get a supply + install quote
Tell us how many panels, how much higher, and which insert – and send a photo of a post top if you can. We reply with a supply-and-installation price. (Buying a DIY kit? Use the online shop instead.)
- 1 What you need
- 2 Details
- 3 Photos
- 4 Contact
- 5 Review
Ready for a free quote?
Send us your fence length, height and a couple of photos and we come back to you with a preliminary price or arrange a free site inspection.