Retaining wall cost too high

What it looks like

• QS or engineer identifies large retaining costs after concept design.
• Driveway, building platform, or boundary treatment requires expensive walls.

Likely causes

• Slope underestimated
• Yield pushed too hard
• Access levels not coordinated
• Boundary and earthworks constraints

Immediate action

1. 1Pause the affected decision or commitment until the issue is understood.
2. 2Record the issue in the risk register with date, source, owner, and next action.
3. 3Send the relevant documents to Civil engineer, Structural engineer, Architect and ask for written advice.
4. 4Update feasibility, programme, budget, and decision register if cost, time, yield, consent, title, finance, or sales assumptions may change.

Step-by-step solution

1. 1Define the problem in one sentence and identify which project decision it affects.
2. 2Check the controlling documents: Topographical survey, Concept plans, Retaining design notes, QS cost plan.
3. 3Ask the responsible professional to confirm whether the issue is real, minor, manageable, or project-changing.
4. 4List the available options: redesign, renegotiate, seek consent, add cost allowance, change programme, change sales strategy, or abandon.
5. 5Price and programme each option using the current feasibility model.
6. 6Make a written decision with source references and approval from the developer or project owner.
7. 7Notify affected parties such as lender, lawyer, consultants, builder, agent, buyer, or council when required.

What not to do

• Do not rely on a seller, agent, or builder comment when a planner, lawyer, accountant, engineer, surveyor, valuer, lender, or council needs to confirm it.
• Do not hide the issue from the feasibility just because the project looked profitable yesterday.
• Do not waive due diligence, lodge consent, sign a contract, approve a variation, or promise settlement while the issue is unresolved.
• Do not give legal, tax, finance, planning, engineering, or council advice to others unless a qualified professional has confirmed it.