How close can I build next to a retaining wall?

As far as the distance between the retaining wall and your house foundation is concerned, the general rule seems to be that the further away it is, the better. A geotechnical expert said that the setback could be anywhere between 3′ and 15′. This will depend on the building codes in a given area.

How close can a retaining wall be to the property line NSW?


In NSW, a retaining wall must be at least 900mm from a boundary line while in parts of Queensland, the retaining walls must be at least 1.5 metres from an adjoining property.

How wide and deep for a footing be for a retaining wall?

To construct a footing for a dry-stacked retaining wall, excavate a trench that is 5 to 7 inches deep plus 1 inch for every 8 inches of planned wall height. Lay 4 to 6 inches of course gravel in the trench and tamp it down, checking for level regularly and making adjustments as needed.

What are the factors to be considered when designing a retaining wall?

When designing a retaining wall, there are seven factors to consider: materials, type of wall, design or on-site placement, drainage, foundations, cant or batter, and anchors or “deadmen”.

How deep should a 3 foot retaining wall be?

The general rule of thumb is to bury about one-eighth of the height of the wall. For example, if your wall will be three feet (36 inches) tall, the first course of blocks should start five inches below soil level.

Does a retaining wall need planning permission?

Planning permission is required if the wall is to be over 1-metre high and next to a road or pathway; or over 2-metres high elsewhere. Independent, freestanding retaining walls may not require building regulation approval; however, any structures must be structurally sound and well maintained.

What are the Australian standards for retaining walls?

The Australian Standard, AS4678 – Earth Retaining Structures deals specifically with walls that are: Greater than 800mm and less than 15m in height. 70° or more to the horizontal (thereby excluding revetment structures with gentler slopes).

Do I need council approval for a retaining wall NSW?

* In New South Wales, you need permission from council to build a retaining wall higher than 600mm from ground level.

Which Neighbour is responsible for retaining wall NSW?

In New South Wales, neighbours would normally share the cost of a retaining wall on a boundary, unless one was responsible for damage. If no agreement can be reached, mediation options are available or you can apply to the NSW Civil Administrative Tribunal for help.

Does a retaining wall need a column?

There are different types of retaining wall as per boundary conditions justifying its economical use. Most commonly used retaining wall is Cantilever Retaining wall (CRW). When considering Retaining wall with greater heights, introduction of columns can give a better economy.

How do you determine the height of a retaining wall?

Calculate the height

Look at the grade of the area you’re planning to work on and what the grade will be once you’ve finished. If the finished grade will be four feet lower than the existing grade, your retaining wall will need to be four feet high. If it is a six-foot difference, you will need a six-foot wall.

How do you design a retaining wall?

Quote from the video:
Quote from Youtube video: Try to maintain a maximum slope of 3 to 1 above the wall where you have a ratio of one up to three back a slope below the wall may reduce stability. And be prone to erosion.

How deep should a trench be for a retaining wall?

Dig a trench for the bottom row of blocks. They should be buried about 1 inch deep for every 8 inches of wall height. This provides strength and stability to your retaining wall. Make sure that your trench is level and compacted.

Do I need a drain pipe behind retaining wall?

A drainage pipe might be needed if: The retaining wall is at least four feet high or taller. Clay or other poor draining soils are behind the wall. There are buried water sources within 50 feet of the retaining wall location.

How deep do post holes need to be for a retaining wall?

Step 3: Digging

Dig a footing depth of roughly the same height as the retaining wall. For post holes, dig holes with a 450mm diameter at the same depth with a 100mm minimum concrete cover below the post.

What angle should a retaining wall be?

You will need to angle the holes so that the post is on a lean towards the bank. The lean should be 1:10 – in other words, for every 100 mm you go up, the post should angle towards the wall 10mm. A purely vertical wall will start to sag over time, so this angle is important.

Can you build your own retaining wall?

Anyone with a strong back can stack up a bunch of blocks and build a pretty stone retaining wall. But it takes skill and planning to construct an attractive wall that can also handle immense pressure, shrug off the forces of gravity, stand for decades and laugh in the face of Mother Nature.

How high can you build a 4×4 retaining wall?

I wouldn’t go any higher than 8 feet. Depending on the shifting soil or sands, I wouldn’t span any farther than 8 feet with the braces.

How deep should a footing be for a block wall?

Normally a foundation wall with seven rows of blocks will be 24 inches wide and 12 inches deep and should have a footing 30 inches below grade.

Do you need landscape fabric behind retaining wall?

You should use landscape fabric behind a retaining wall because the fabric supports the bricks, wood, or other materials that make the wall. Wet soil can push against a retaining wall, weakening it. By placing a strip of landscape fabric under the soil, the wall won’t have as much pressure on it.