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
Supply and install, or supply only
We install extensions across Sydney – tell us the number of panels, the post profile and the insert you want and we quote it, or arrange a free site look if the posts need checking. Kits are also sold supply-only with pick-up in Sydney's west or delivery Australia-wide.
Step-by-step Colorbond fencing video
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 fence extension quote
Tell us how many panels, how much higher, and which insert – and send a photo of a post top if you can.
- 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 Jye will come back to you with a preliminary price or arrange a free site inspection.