7 Signs Your Retaining Wall Is Failing | Hawke’s Bay
- Jun 28
- 4 min read
Updated: Aug 6
Retaining walls work hard every day. They hold back tonnes of soil, manage changes in ground levels, and help create usable outdoor spaces. However, like any structure, they can deteriorate over time, eventually becoming a failing retaining wall if problems are left unaddressed.
If caught early, many retaining wall problems can be repaired before they become major issues. Left too long, a failing retaining wall can collapse, damaging fences, driveways, gardens, and even nearby buildings.
Here are seven warning signs that your retaining wall may be approaching failure.
1. The Wall Is Leaning Forward
Leaning timber retaining wall showing early signs of structural failure in Napier. Timber retaining wall leaning due to soil pressure and failing posts in Hastings Severely leaning retaining wall requiring repair or replacement in Havelock North.
One of the most obvious signs of trouble is a retaining wall that is no longer standing straight. If you've noticed a leaning timber wall, it may be a sign that the retaining wall has reached the end of its life. In this project, we show how we carried out a complete wooden retaining wall rebuild, including drainage, engineering and council consent.
Retaining walls are designed to resist the pressure of the soil behind them. If the wall begins to lean forward, it often means that the pressure behind the wall is exceeding its strength.
Common causes include:
Poor drainage
Undersized posts or foundations
Increased loading behind the wall
Natural ageing of materials
A slight lean may not seem significant, but it can worsen quickly if the underlying cause is not addressed.
2. Rotting Timber Posts or Boards
Timber retaining walls are popular throughout Hawke's Bay because they are cost-effective and attractive. However, timber does not last forever.
Signs of timber deterioration include:
Soft or spongy timber
Crumbling wood around the base of posts
Visible fungal growth
Timber that can be easily damaged with a screwdriver
The greatest concern is often below ground level where rot can remain hidden until the wall starts moving.
If timber posts lose their strength, the entire wall can become unstable.
3. Cracked Concrete
Cracked concrete retaining wall showing structural movement and signs of failure in Napier. Concrete block retaining wall with major cracking and separation requiring repair in Hastings. Damaged concrete retaining wall with visible cracks caused by ground movement in Havelock North.
Concrete retaining walls are extremely strong, but significant cracking can indicate movement or structural issues.
Link “cracked concrete” to the cracked block-wall project.
Not all cracks are serious. Small hairline cracks are often cosmetic. However, larger cracks may suggest:
Foundation movement
Excessive soil pressure
Poor drainage
Structural failure
Pay particular attention to cracks that are widening over time or are accompanied by movement of the wall.
If you notice a cracked block retaining wall or large cracks in a concrete retaining wall, it is worth having the wall inspected before the problem becomes more expensive to repair. You can also see how we replaced a failing wall in our Cracked Block Wall Replacement Project.
4. Water Is Coming Through the Wall
Water leaking through a retaining wall due to poor drainage and hydrostatic pressure in Napier.
Water is one of the biggest enemies of retaining walls.
When water cannot drain properly, pressure builds behind the wall. This additional force can dramatically increase the load the wall must carry.
Warning signs include:
Water flowing through the wall
Constant wet areas
Mud washing out from behind the wall
Blocked drainage outlets
A retaining wall may appear strong enough to hold back soil but struggle when it must also hold back water.
Proper drainage is often just as important as the wall itself.
5. Tree Roots Are Pushing Against the Wall
Tree roots growing behind a stone retaining wall and creating pressure that can lead to wall failure Stone retaining wall affected by tree root growth, increasing the risk of structural movement in Has Large trees planted above a retaining wall can cause damage as roots expand in Havelock North Exposed tree roots pushing against a stone retaining wall and displacing rocks in Napier Retaining wall damaged by expanding tree roots causing stones to loosen and shift in Hastings. Mature tree roots breaking through a stone retaining wall and causing structural damage in Havelock
Trees can create significant problems for retaining walls.
As roots grow, they can:
Push walls outward
Lift foundations
Block drainage systems
Create uneven pressure behind the wall
Large trees located close to retaining walls should be monitored carefully.
Even if the wall appears stable today, continued root growth can cause gradual movement over time.
6. Soil Is Settling Behind the Wall.
Gap forming behind a timber retaining wall as soil settles and washes away in Napier Ground sinking behind a timber retaining wall, creating voids that reduce structural support in Hast Soil settlement behind a timber retaining wall indicating drainage problems and potential wall failu
A retaining wall can sometimes remain standing while the ground behind it begins to settle.
Signs include:
Depressions forming behind the wall
Gaps appearing between the wall and soil
Sunken garden beds
Uneven paving or paths nearby
This can indicate soil loss through drainage failures or movement of the retained material.
These problems often become more noticeable after heavy rainfall.
7. New Weight Has Been Added Behind the Wall
Garage placed behind a retaining wall, increasing pressure and the risk of failure in Napier New garage added behind a retaining wall without engineering assessment, creating extra surcharge lo Retaining wall showing movement after extra weight was added behind the wall in Havelock North
A retaining wall may have performed perfectly for years and then suddenly start showing signs of distress.
Often the reason is additional weight, known as a surcharge load.
Examples include:
Vehicle parking areas
Concrete driveways
Garden sheds
Swimming pools
Raised garden beds
Large stockpiles of soil
Retaining walls are designed for specific loads. Adding extra weight behind the wall can significantly increase the pressure it must resist.
Before placing heavy structures near an existing retaining wall, it is wise to ensure the wall is capable of handling the additional load.
Conclusion
This project demonstrates how a well-designed retaining wall can provide decades of reliable service when it is built correctly. Proper engineering, drainage, quality materials and careful construction all play an important role in the finished result.
Thinking about building or replacing a retaining wall?
Visit our Retaining Walls page to learn about timber, concrete block and rock retaining walls, council consent requirements, common problems and the services we provide throughout Napier, Hastings and Havelock North.
What Should You Do If You Have a Failing Retaining Wall?
Not every retaining wall showing signs of ageing requires complete replacement.
In some cases, repairs, improved drainage, or partial rebuilding may be enough to extend the wall's life.
The key is identifying problems early.
If you have concerns about a retaining wall on your property, the team at Everyday Contractors can assess the situation and discuss practical options for repair or replacement.
We build and repair timber retaining walls, concrete block retaining walls, and palisade retaining walls throughout Napier, Hastings, and Havelock North.
Contact Us
If you would like a free quote or advice on your retaining wall project, contact Everyday Contractors today. We'd be happy to discuss your options and provide practical solutions for your property.
Service Areas: Napier, Hastings, Havelock North and surrounding Hawke's Bay areas.
The easiest way to get started is to send us a few photos or your plans.
📧 Email: info@everydaycontractors.com
Or visit our website: www.everydaycontractors.co.nz
We'll review your project and provide practical advice on the best way forward.
