How to build a fence extension?

[JustinMcAbbe]

Hello,

I am renovating my courtyard and plan to remove the trees. I want to extend the existing fence and gate to be higher, aligning them with the white walls on each side. While I could have the fence rebuilt, I’m considering a DIY approach. It needs to be about a meter or more taller. I’d also like a new gate that matches the wall height for aesthetics.

I was thinking of screwing lattice into the existing fence for a similar look to the image below.

[JacobZ]

Hi @JustinMcAbbe,

Thank you for your question.

The increase in height is substantial at around a metre, so you would need to add a supporting frame to the existing structure, including rails and posts, which would likely make it worthwhile to replace the fence altogether.

Is it possible to get some clearer photos of the gate and the fence? This will help our members offer their best advice.

While we wait, allow me to tag @Dave-1, @Nailbag and @Jewelleryrescue to see if they have any ideas.

Let me know what you think.

Jacob

[Nailbag]

Hi @JustinMcAbbe 

My initial thought is can the existing fence handle the weight of the supporting frame and screenings. A 1mtr increase is a lot so I would have the same concerns as with @JacobZ 

The other consideration which is often overlooked is the effects of wind which can increase a lot of pressure on the main posts and footings. 

So I would consider those points and maybe get some professional advice from a builder prior. 

Nailbag

[Jewelleryrescue]

Hi @JustinMcAbbe 

I think your key word you used is aesthetics as part of your project goal bucket list. I am not sure you will achieve it with a lattice extension? as a reflection on your words.

But here goes, Typical lattice is usually best made with a timber box around it think picture frame supporting the canvas in the middle. See Lattice capping   Notice the hollow section for your lattice to sit in. This box frame surrounds the lattice or other flimsy timber but nice-looking fence extensions and will support it for a longer period of time as lattice stand alone will fall apart in 3 to 4 years as they are made of thin staples holding it together, painting it will help it last longer here.

The square edge of the lattice Capping could sit on your fence.  To make this work you need Framing H3 pine lengths  bolted and screwed to your existing up right fence posts Then make picture frame like lattice panels to fit in between the post extensions.  If possible dig on the inside of the fence post holes to extend the new tall upright posts into the ground 600mm for a stronger result.

As a side note you can use the Lattice capping rails and form a box picture frame and basically insert any screening material you want and or use treated timber pine vertical timbers inserted and attached to the lattice framework. match your existing fence pattern instead of lattice this will improve aesthetics. 

The fence will have moderate to low strength and as it has openings to let the wind through that will reduce wind pressure so it will last accordingly. Life span in a sheltered position many years Cyclone region the first big storm.

The gate is a lot harder if you extend the gate make sure you have extra strong hinges below and the hinge post needs to be full length of the gate to swing it properly.

Another option is to screw Screening panels to your existing fence and will last 15 years plus they can be framed too.  Many choices here at bunnings.

You can add them vertically and have them sit on the ground.  Or add them horizintally sitting on you existing fence. (will need a frame for this use.)

Hope this helps.

[Dave-1]

Afternoon @JustinMcAbbe 

A 1m extension of the fence plus the gate heads me towards better investing in redoing the fence and gate.

You could "cost" the materials for the extension

- extra posts to extend the backing of whatever you use as a cover

-The rear covering

- Nuts and bolts needed.

- Larger hinges for the gates added weight and height. Potentially having to change the gates post as it will need to deeper.

- Loss of space, by this I mean you will have your existing fence, then new studs and then your new fence top. Compared to just a fences width. I actuly saw an example of the double fence today and was trying to nut out why Now I know the answer.

Wind has been mentioned but your local council rules for front fences may kick in, I have to have a percentage of viewablity through mine (Im guessing the figure but know it is not allowed to form a solid wall) o that would be my first step, have a look online for your local council.

Compare this to a professionally built fence, they will know the existing regulations for your area, will work with it and also you know it will be strong enough with the correct spacing of the actuall fence posts for the height.

Dave