For boards and CFOs, few numbers create more false confidence than an early decommissioning cost estimate.
Clean numbers. Structured breakdowns. Confidence in every line.
But the real question is not how detailed the estimate looks.
It’s whether it reflects reality — or optimism.
As projects progress, those early figures often move. Sometimes significantly. And when they do, the impact can be substantial:
- Cost overruns
- Delayed permit surrender
- Contractor claims
- Balance sheet exposure
- Governance pressure
- Millions in liability movement
So what’s being missed?
Are we underestimating remediation?
Remediation is one of the most consistently underestimated elements in decommissioning.
At early stages, assumptions are often made around:
- contamination levels
- ground conditions
- hazardous materials
- extent of removal or treatment
But until intrusive investigation and detailed planning take place, these are largely informed assumptions.
As more is understood, remediation scope expands and so does cost.
The risk isn’t just technical. It’s financial exposure driven by incomplete early assumptions.
Is permit surrender actually included?
Many early estimates focus on demolition.
Fewer fully account for what it takes to achieve permit surrender.
This includes:
- environmental validation
- regulatory engagement
- documentation and verification
- long-tail monitoring or remediation
- demonstrating a compliant end state
Permit surrender is not a line item, it’s an outcome.
If it’s not clearly defined and costed from the outset, it often becomes a late-stage surprise with both time and cost implications.
Is the demolition methodology realistic?
Early estimates are often built around high-level assumptions about how demolition will be delivered.
But demolition methodology is not static — it evolves.
As projects develop, factors such as:
- access constraints
- structural condition
- sequencing
- temporary works
- safety requirements
all influence how the works can actually be carried out.
A methodology that looks efficient on paper may not be buildable in practice.
When methodology changes, cost follows.
Are we pricing certainty or optimism?
This is the central question.
At early stage, estimates are shaped by:
- limited data
- developing scope
- evolving methodology
- assumptions around risk
That’s expected.
What’s often missing is a clear understanding of:
- how sensitive the estimate is to change
- where optimism may exist
- what realistic delivery scenarios look like
Without that, boards are not seeing certainty — they’re seeing a single version of a much wider range of possible outcomes.
The role of independent challenge
At Circulis, we approach decommissioning cost estimation differently.
Not as a fixed number — but as a reflection of what will actually happen on the ground.
- We challenge underestimated demolition complexity
- We identify missing remediation scope
- We pressure-test permit surrender assumptions
- We review contractor pricing assumptions
By doing this, we help turn early estimates into something more useful:
A decision-making tool grounded in reality, not just presentation.
Final thought
The biggest risk is rarely the number itself. It is false confidence in the number.
Before relying on any decommissioning cost estimate, boards should be asking:
- Are we underestimating remediation?
- Is permit surrender fully accounted for?
- Is the demolition methodology realistic?
- Are we seeing certainty or optimism?
The answers to those questions will define how the numbers evolve and how exposed the business becomes.
For boards and senior stakeholders, this level of clarity is critical. It provides confidence that the numbers are grounded in reality and that potential exposures are understood.
Speak to Circulis about how we can help you bring greater certainty, transparency and confidence to your decommissioning strategy. Call us on 0333 090 7331
