Retaining Walls and Property Value

1. How Retaining Walls Affect Value

Retaining walls directly affect usable land area — a well-engineered wall that creates level usable ground adds measurable value. But the engineering status of the wall matters as much as its physical condition.

Buyers and their solicitors increasingly request evidence that retaining walls were permitted and engineered. Walls built without permits, particularly those over the permit threshold, create disclosure obligations and potential liability for sellers.

2. Permits, Certificates and Disclosure

In most Australian states, the vendor is required to disclose known building defects and unpermitted works. A retaining wall built without the required permit is an unpermitted structure.

• Pre-sale inspection — buyers routinely get building and pest inspections that include retaining walls
• Solicitor enquiries — conveyancing searches may reveal council orders or compliance issues related to walls
• Building orders — councils can issue orders requiring walls to be brought into compliance, which can delay or kill a sale
• Engineering certificates — having a current engineering certificate for a wall significantly reduces buyer concern

3. Pre-Sale Engineering Assessment

If you are selling a property with significant retaining walls, a pre-sale structural assessment can:

• Identify issues before buyers do
• Provide written certification of structural adequacy for walls that were built correctly
• Scope remedial work required for walls with defects, allowing informed vendor disclosure and pricing
• Demonstrate due diligence to potential buyers, reducing the risk of post-sale claims

The cost of a pre-sale engineering assessment is typically $500–$1,500 depending on the number and complexity of walls. This is modest relative to price renegotiation risk.

What to look for in a retaining wall →

4. What Buyers Do When They Find a Defect Wall

A wall identified as defective in a pre-purchase inspection typically results in one of:

• Price reduction — buyer requests a reduction equivalent to the estimated repair cost (often over-estimated)
• Vendor repair — vendor agrees to repair or replace the wall before settlement
• Walk away — buyer exits the contract if there is a building and pest clause
• Disclosure acceptance — buyer accepts the condition with reduced expectations built into the price

None of these outcomes favour the vendor. Getting a wall properly engineered and certified before listing is almost always the better financial decision.