Ever looked at your sloping backyard and wished for some flat, usable space? A retaining wall is a structure that holds back soil so you can create level ground. Done right, it gives you more usable yard, tidies things up and stops soil washing away.

Top 10 Reasons to Install a Retaining Wall in Your Backyard

Here are 10 reasons to consider one:

Adds Curb Appeal

A retaining wall creates a tidy, structured look that instantly improves your home's curb appeal. Whether made of stone, brick or wood, it provides an attractive border and helps define outdoor spaces.

Holds Back Soil

The main purpose of a retaining wall is to prevent soil erosion by holding back embankments. It stabilises the soil and prevents it from slipping or subsiding. This is especially useful if you have a sloped yard.

Creates Usable Space

By holding back soil, a retaining wall allows you to create usable, level spaces in sloped areas. You can have terraces, patios, walkways and garden beds.

Increases Property Value

A well-built retaining wall that improves your outdoor space can add to your home's resale value. A badly built one that leans or cracks does the opposite.

Provides Seating

For casual seating, the top layer of a retaining wall can double as a bench. Just add some cushions for comfort.

Offers Privacy

Stacking multiple retaining walls at different heights creates secluded spaces and hides parts of your yard from view. This provides more privacy for you and your outdoor activities.

Requires Low Maintenance

Once it's built properly, a masonry wall needs little more than keeping the weep holes and drains clear.

Resists Weather Damage

Masonry and concrete walls won't rot. Treated timber sleeper walls typically last 15 to 20 years, and you need to check them for rot and termites.

Creates Garden Focal Points

A retaining wall adds height and dimension to a yard. It makes an ideal backdrop for plants and creates focal points in the garden. You can also decorate the wall itself with climbing vines, potted plants or artwork.

Safety Barrier

Low retaining walls can define edges and help keep kids and pets out of garden beds. Under the NCC, you need a barrier where someone could fall more than 1 m from a trafficable surface, like a path, lawn or deck at the top of the wall.

Retaining Wall FAQs: Your Most Common Questions Answered

Here are answers to the most common questions about retaining walls.

How much do retaining walls cost? It depends on the height, length, materials and access. Prices vary a lot, so get at least three itemised quotes that include excavation, drainage, backfill and engineering.

Do I need building approval? In Queensland, a retaining wall generally needs building approval if it's over 1 m high, if it's within 1.5 m of a building or another retaining wall, or if it holds up a load like a driveway or house footings. Check with a private certifier and your council before you build. Unapproved walls can lead to fines or having to pull the wall down.

What is the maximum height? There's no general height rule by material. Any wall over 1 m needs an engineer's design, whatever it's made of.

How long do retaining walls last? It depends on the materials and workmanship. Well-built concrete and masonry walls can last 30 years or more; treated timber typically lasts 15 to 20 years. Keeping drains clear and fixing problems early helps them last.

How do I stop water building up behind the wall? Use drainage behind the wall: a slotted ag pipe, drainage gravel, and geotextile fabric or drainage cell. This relieves water pressure (hydrostatic pressure) that can push a wall over. Follow your engineer's or the manufacturer's design.

Before You Build

A retaining wall can add usable space, control erosion and drainage, and make your yard safer and better looking. But it's a structure, not just landscaping.

Before you build, ask your certifier whether you need approval, get an engineer for anything over 1 m, and make sure the drainage runs to a lawful point of discharge, not onto your neighbour's place.