When the Storm Hits the Site: Is Your Contract Ready?

Do you feel that severe weather events are becoming more and more common?

Floods. Cyclones. Storms.

Every year it seems like another “once-in-a-decade” weather event appears in the news.

This weekend, New Zealand is preparing for another major weather system moving across the North Island, bringing damaging winds, heavy rainfall, flooding risks, and potential power outages. 

For many people, the concern is simple:

Will my house be safe?

Will the roads flood?

Will the power stay on?

But for those of us working in construction, a different question quietly float to the surface:

Is the contract prepared for it?

Is the project prepared for it?

Because when severe weather hits a construction site, the consequences can be significant.

I am not just talking about the physical damage.

But more about the commercial and contractual impact.

The Reality: Severe Weather Is No Longer Rare

New Zealand has always had unpredictable weather. But in recent years, the scale and frequency of extreme events appear to be increasing.

In just the past few years, the country has experienced:

• major flooding events

• landslides disrupting infrastructure

• tropical cyclone impacts

• widespread project delays

Earlier this year alone, heavy storms across both islands caused flooding, landslides, travel disruptions, and states of emergency in several regions. 

For the construction industry, these events are not just environmental problems.

They are programme problems.

They are cost problems.

And sometimes, they become disputes.

Because when the weather shuts down a site, someone inevitably asks:

Who should bears the risk?

When the Storm Hits a Site

Imagine a typical scenario.

A large construction project is underway.

Then suddenly:

• heavy rain floods the excavation

• high winds damage temporary structures

• access roads become unusable

• cranes stop operating due to wind limits

• deliveries are delayed

• work stops for days

The programme starts slipping.

Costs start rising.

Subcontractors begin claiming delays.

And the project team starts looking at the contract.

Because the key question becomes:

Is this delay excusable?

Or more importantly:

Is it compensable?

Weather Risk: What Do Contracts Usually Say?

When severe weather disrupts a construction project, the discussion quickly moves from the site to the contract.

Project teams begin asking difficult questions:

• Is the contractor entitled to an extension of time?

• Should additional costs be paid?

• Or is this simply part of the risk that contractors are expected to manage?

The answers are rarely straightforward. In practice, they often depend on how several key questions are interpreted:

• Was the weather event exceptional, or was it something that should reasonably have been anticipated? And that immediately raises another question: what does “foreseeable” actually mean in today’s construction environment? If cyclones, flooding, and major storm events are happening more frequently, do we still treat them as unforeseeable? Or do they start becoming part of the risk that project teams are expected to plan for?

  
  

• Was the event beyond normal seasonal conditions?

  But again, how do we define “normal”? Is “normal” based on historical weather patterns, long-term averages, recent years, or what the parties should reasonably expect in a particular region and season?

  
  

• Did the event genuinely affect the critical path of the programme?

  In other words, did it actually delay completion, or did it simply disrupt activities that had available float?

  
  

• Was the contractor able to mitigate the delay?

  Could the contractor reasonably have reduced the impact through better planning, resequencing, temporary protection, or other practical measures?

These questions matter. But even more importantly, the definitions behind them matters more.

Because in practice, disputes often do not arise from the weather event itself. They arise from the uncertainty around the language used to assess it.

That is where the real debate begins.

And remember, more of the extension of time does not automatically mean the contractor is paid additional costs. Often the contractor only receives time but no money.

Which means the financial risk may still remain with the contractor, even when those risks been recognised in the contract.

The Hidden Problem: Many Teams Don’t Think About Weather Until It Happens

In theory, construction professionals understand weather risk.

In practice, however, many projects only start discussing it after the storm arrives.

This creates problems.

Because when severe weather occurs:

• programmes may not include realistic weather allowances

• site protection measures may be insufficient

• documentation may be incomplete

• delay notices may not be issued correctly

And when these issues combine, disputes can escalate quickly.

I have seen situations where:

• contractors assume the weather automatically entitles them to compensation

• principals assume the contractor should have planned for it

• neither side has properly recorded what actually happened

When documentation is weak, the outcome often depends on interpretation.

And interpretation often leads to disputes.

Climate Change Is Changing the Risk Landscape

Another important reality is emerging.

Weather patterns are shifting.

Meteorologists increasingly warn that storms may become more intense, slower moving, and longer lasting due to global climate changes. 

This matters for construction.

Because contracts written twenty years ago may not have anticipated:

• more frequent extreme rainfall

• longer periods of disruption

• repeated severe weather during a single project

If extreme weather becomes more common, then the question becomes:

Should the industry rethink how weather risk is allocated?

Because if every severe weather event is treated as “exceptional,” eventually it may stop being exceptional, but rather normal.

Is Your Project Prepared?

Beyond contracts, there is also a practical question.

Is the project itself prepared?

Severe weather can expose weaknesses in site planning.

For example:

• Is temporary drainage sufficient?

• Are materials properly protected?

• Are excavation works stabilised?

• Are temporary structures secured?

• Is there a clear weather contingency plan?

Sometimes the biggest damage does not come from the storm itself.

It comes from lack of preparation.

A well-prepared site can often withstand severe weather with minimal impact.

A poorly prepared site can suffer major damage.

Three Practical Steps Construction Teams Should Consider

Severe weather cannot be avoided.

But its impact can be managed.

Here are three practical steps you could consider:

1. Understand the Contract Before the Storm

Project teams should understand clearly:

• what weather events qualify for extensions of time

• what evidence must be provided

• what notice requirements apply

Too often these clauses are only read after the delay occurs.

By then, it may already be too late.

2. Document Everything

When severe weather impacts a project, documentation becomes critical.

Teams should record:

• weather data

• site conditions

• photographs

• programme impacts

• daily site records

Good documentation protects both contractors and principals.

Without it, disputes become difficult to resolve.

3. Plan for Weather Risk Early

Weather should be considered during:

• programme planning

• risk allocation

• site logistics planning

Questions worth asking include:

• Are weather allowances realistic?

• Are temporary works designed for extreme conditions?

• Are supply chains resilient to disruption?

Planning early often saves time later.

A Simple Question Worth Asking

As severe weather approaches this weekend, many people are preparing their homes.

But perhaps those of us in construction should also ask a different question.

Not just:

Is the weather severe?

But also:

Is our project prepared for it?

And perhaps most importantly:

Is our contract prepared for it?

Because when the storm finally passes, the real challenge begins.

And it will be the commercial one.