What Retaining Walls Need Before Construction Even Begins

Retaining wall preparation begins long before the excavator arrives on site. While many homeowners assume construction starts when the first bucket of soil is removed, the most important work happens days or even weeks earlier. Proper retaining wall preparation includes assessing the site, understanding drainage, identifying hidden risks and designing a solution that suits the property. Get that preparation right, and you’ll dramatically improve the chances of building a retaining wall that performs well for decades.

Interestingly, nobody has ever called us just to admire a perfectly functioning retaining wall.

Instead, people contact us because something has gone wrong.

Sometimes the wall is leaning. Other times the timber has rotted, water is washing soil away, the fence has started to move or a concerned neighbour has noticed a problem.

By the time we arrive, we’re rarely building a retaining wall from scratch. More often than not, we’re solving problems that have developed over many years.

That’s why thorough retaining wall preparation matters just as much as quality construction.

The Retaining Wall Is Usually the Easy Part

This might sound strange coming from a retaining wall contractor, but the retaining wall itself is often the simplest part of the project.

The real challenge is everything surrounding it.

Every retaining wall sits within an existing environment. Old drainage systems, mature trees, underground services, neighbouring fences, swimming pools, sheds, driveways and previous retaining walls can all influence how the new wall should be designed.

We rarely start with a blank canvas.

Instead, we inherit decades of decisions made by previous owners, builders and landscapers.

Understanding those earlier decisions is where the real work begins.

Retaining Wall Preparation Starts with the Site

When we first inspect a property, the proposed wall location is only one piece of the puzzle.

Good retaining wall preparation means stepping back and understanding the entire site before discussing materials or construction methods.

We’re asking ourselves:

• How can we safely access the site?
• What risks already exist?
• Why has the existing wall failed?
• Where is water coming from?
• Where should stormwater go?
• What services may be hidden underground?
• Which nearby structures could be affected during construction?

Retaining walls rarely fail without a reason.

If we don’t identify the real cause before construction begins, those same issues can damage the new wall in the future.

Our objective isn’t simply to replace a retaining wall.

Our objective is to solve the problem that caused the original failure.

You’re Not Buying a Wall. You’re Creating Usable Land

One thing we’ve learnt over the years is that homeowners don’t really want a retaining wall.

They want what the retaining wall makes possible.

That could be:

• A flatter backyard
• A level lawn for the kids
• Space for a swimming pool
• A larger entertaining area
• Safer access around the home
• A property that’s easier to maintain

The retaining wall is simply the structure that creates those opportunities.

When we focus on the outcome instead of just the wall, better decisions naturally follow throughout the project.

Drainage Is One of the Most Important Parts of Retaining Wall Preparation

If there’s one hidden component worth investing in, it’s drainage.

Water creates pressure behind retaining walls.

Over time, it softens the supporting soil, washes valuable material away and places loads on the wall that it was never designed to carry.

That’s why effective drainage should always form part of your retaining wall preparation, not become an afterthought during construction.

At the same time, not every property needs an elaborate drainage system.

Sometimes the natural fall of the land, combined with thoughtful landscaping, provides an excellent solution without unnecessary cost.

Like many things in construction, the right answer depends on the property.

Every Retaining Wall Inherits Someone Else’s Decisions

One reality of residential construction is that we rarely start fresh.

Instead, we often work around:

• Old retaining walls
• Tree roots
• Existing concrete
• Damaged drainage
• Underground services
• Boundary fences
• Swimming pools
• Garden sheds
• Mature landscaping

Each one introduces another layer of complexity.

That’s why two retaining walls with the same height can require completely different construction methods and budgets.

The walls may look identical.

However, the site conditions almost never are.

Site Access Is a Critical Part of Retaining Wall Preparation

Access influences almost every stage of a retaining wall project.

Can machinery reach the site?

Will excavation happen by machine or by hand?

Where will materials be delivered?

How will spoil leave the property?

Can neighbouring properties remain protected?

Although these questions seem simple, they often have a greater impact on project costs than homeowners expect.

In fact, a smaller retaining wall with poor access can become far more complicated than a larger wall with excellent access.

The Cost of a Retaining Wall Is About More Than the Wall

Thousands of online articles explain retaining wall costs.

However, most oversimplify the conversation.

Years ago, while completing numerous retaining wall projects around Ripley, many people considered us one of the more expensive contractors in the estate.

Looking back, we weren’t expensive.

We simply priced our projects differently.

Over time, the conversation changed.

Homeowners stopped asking who was cheapest.

Instead, they wanted to know who communicated well, planned thoroughly, turned up on time and delivered exactly what they promised.

Ultimately, reliability became far more valuable than the cheapest quote.

That experience reinforced something we still believe today.

A retaining wall isn’t simply another product.

It’s a construction project that depends on planning, communication and excellent retaining wall preparation from beginning to end.

Sometimes the Best Investment Isn’t the Wall

If someone handed me an extra $3,000 to improve a retaining wall project, I probably wouldn’t spend it on larger posts or thicker sleepers.

Instead, I’d invest in a professional landscape design.

Why?

Because a retaining wall should never be considered on its own.

A quality landscape plan can improve drainage, reduce unnecessary retaining, position planting more effectively and create smoother transitions between different levels.

Sometimes it even reduces construction costs because you’re solving the whole site instead of focusing on one problem.

The goal isn’t to build the biggest retaining wall.

The goal is to create the best backyard.

Less Retaining Is Often Better

This might surprise some people, but if I were designing my own forever home on a sloping acreage block, my first objective wouldn’t be adding retaining walls everywhere.

Instead, I’d retain only where it genuinely solved a problem.

Everywhere else, I’d work with the natural landscape.

Excellent planting choices can reduce erosion while softening the appearance of the property.

Where retaining was genuinely required, I’d combine different materials.

Concrete sleeper retaining walls would provide strength where practical, while rendered masonry feature walls could create visual impact where aesthetics mattered most.

Layer those with feature trees, decorative screens, quality planting and thoughtful lighting, and the retaining wall becomes part of the landscape rather than the feature itself.

That’s a far more timeless outcome than retaining every change in level.

Communication Makes Retaining Wall Preparation Better

The best projects almost always begin with good conversations.

Not just about colours or materials.

We also discuss future plans, drainage, neighbouring properties, access, approvals, budgets and ongoing maintenance.

The more information everyone shares before work begins, the fewer surprises arise during construction.

Questions asked early almost always cost less than problems discovered later.

Questions Worth Asking Before Building a Retaining Wall

Before committing to construction, ask your contractor:

Why has the existing wall failed?

Understanding the cause is just as important as replacing the wall itself.

How will water be managed?

Proper drainage should be part of the original design, not an afterthought.

What hidden risks can you see?

An experienced contractor should identify underground services, neighbouring structures, drainage concerns and site constraints before work starts.

What are we really trying to achieve?

The answer shouldn’t simply be “build a retaining wall.”

It should explain how the finished project will improve your property.

Is there a simpler solution?

Sometimes a different layout or smaller wall delivers a better long-term outcome.

Frequently Asked Questions

Why is retaining wall preparation so important?

Proper retaining wall preparation identifies drainage issues, access challenges, underground services and site constraints before construction begins. That reduces surprises and helps deliver a stronger, longer-lasting retaining wall.

What causes most retaining wall failures?

In our experience, poor drainage, inadequate planning, difficult site conditions and ignoring the original cause of movement usually contribute to failure.

Does every retaining wall require engineering?

Not always. Requirements depend on wall height, local regulations, site conditions and the loads the wall will support.

Does difficult access increase construction costs?

Yes. Access influences excavation, material handling, labour, spoil removal and overall project duration.

Should every sloping block have retaining walls?

Not necessarily. Sometimes working with the land creates a more attractive, practical and cost-effective result than retaining every change in level.

Final Thoughts

The best retaining wall projects don’t begin with machinery.

They begin with good retaining wall preparation.

That means asking the right questions, understanding the site, planning drainage, identifying risks and designing the project around how you’ll use your property for years to come.

At Conker, we’ve learnt that building the wall is often the easy part.

Understanding everything around it is where the real work begins.

After all, homeowners rarely set out to buy a retaining wall.

They’re investing in a safer, more functional and more enjoyable property.

The wall is simply one part of making that happen.

Have a question or a topic you’d like us to cover? Email us at advice@conker.com.au.