Guide

Storms, Insurance and Resilience

Much of the world's most desirable island real estate sits inside a hurricane or cyclone belt. This is an orientation to what that means in practice: how to build so a storm is survivable, how difficult and costly remote coastal property has become to insure, and how the wisest owners combine cover, reserves and design into genuine resilience.

The tropical latitudes that make an island beautiful are, in large part, the same latitudes that make it dangerous. Warm water is what grows the reef and the palm, and it is also what grows the storm. An owner cannot separate the two, and the mature approach is not to pretend the risk away but to price it, build against it, and hold reserves for the day it arrives. Resilience, understood this way, is not pessimism. It is the condition of owning a coastal asset with your eyes open.

You cannot insure your way out of a storm belt. You build for the storm, insure what you can, and reserve for the rest.

The belts, and what they mean

The Atlantic hurricane season runs from June to November and reaches much of the Caribbean, the Bahamas and the western Atlantic. The Pacific and Indian Ocean cyclone seasons carry the same weather under different names. Not every desirable island lies inside a belt: parts of the southern Caribbean sit largely below the main hurricane track, and the equatorial band, including much of the Seychelles, sees genuine cyclones rarely because storms need distance from the equator to spin up. Where an island sits relative to these tracks is one of the first facts to establish, because it governs everything that follows, the build standard, the insurance market's appetite, and the resale. It is a headline entry in any island dossier we prepare.

Building for resilience

A storm attacks in three ways at once, wind, water-borne debris, and surge, and a resilient building answers all three. The benchmark worth knowing is the standard adopted in the most storm-exposed parts of Florida, the High-Velocity Hurricane Zone, where the design wind speed exceeds 170 mph and the entire building envelope, not merely the windows, must resist impact. Impact glazing there is tested by firing a nine-pound timber stud at the glass at around 34 mph, on the theory that flying debris, not wind alone, is what breaches a building and lets the storm in. An island house does not have to sit in Florida to be built to that logic, and the best ones are.

Elevation is the single most valuable decision. Raising the living space above the modelled surge height on engineered piles turns a total loss into a survivable event, which is why it recurs in our note on building on a private island. Set against that, resilience also means the systems that keep the island alive, its power and its water, being hardened and redundant, because after a major storm outside help may be days away and the island has to sustain itself in the interval.

The difficulty and cost of insurance

Insuring remote coastal property has become materially harder and more expensive, and an island owner feels the full weight of it. The direction of travel is visible in the exposed US markets that price similar risk: a modest coastal dwelling in Florida can run several thousand dollars a year, with average premiums on a mid-value home reaching into the low tens of thousands, and the private market has retreated so far that the state insurer of last resort now carries well over a million policies where it held a fraction of that a few years ago. An island compounds every factor an underwriter dislikes: it is coastal, it is exposed to wind and surge, and it is remote, so a loss adjuster, a repair crew and materials cannot easily reach it.

Three features of the market matter to an owner. First, the deductible is a percentage, not a fixed sum: hurricane deductibles commonly run from 1 to 15 per cent of the insured value, so on a high-value island the first tranche of any storm loss, potentially a very large sum, falls on the owner regardless of the policy. Second, wind is frequently carved out of the main cover and must be bought separately, sometimes only through a specialist or a state pool, and remote wind cover can be the hardest line of all to place. Third, cover is conditional on the build: an underwriter will look for exactly the resilience measures above, and a house built to storm standard is not only safer but materially cheaper and easier to insure, which is where access and resilience meet the balance sheet.

• Percentage deductible, often 1–15% of insured value, borne by the owner first
• Wind cover frequently separate and hardest to place on remote sites
• Premiums driven by exposure, remoteness and the build standard
• Underwriters reward elevation, impact protection and a continuous load path
• Named-storm and flood terms read carefully, and read before completion

Self-insurance and reserves

Because full commercial cover is expensive, sometimes unobtainable, and always subject to a large deductible, most serious island owners self-insure a meaningful slice of the risk deliberately rather than by accident. That means a dedicated, funded storm reserve, a ring-fenced sum sufficient to cover the deductible and to begin repairs before any claim pays out, replenished each year as part of the running budget. A common discipline is to reserve annually against the eventual cost of a major repair rather than to hope the policy carries it in full.

Parametric cover is worth knowing here. Rather than indemnifying an assessed loss, a parametric policy pays a fixed sum automatically when a defined trigger is met, a storm of a given category passing within a given radius, for instance. It settles in days, not months, and needs no adjuster to reach the island, which suits remote property. It will not perfectly match the loss, but as a fast injection of cash to start recovery it complements a traditional policy and a reserve, and it is increasingly used precisely where conventional cover is thin.

The long horizon: sea level and erosion

Beyond any single storm sits the slower question of the shoreline itself. Assessments of global mean sea-level rise by 2100 span a wide plausible range, from roughly 0.3 metres at the low end to around 2 metres under high-emission, rapid-ice-loss pathways, and a substantial share of the world's sandy beaches are projected to retreat significantly over the century. For an island, the practical implications are concrete: buy elevation and buy set-back. Living space raised well above today's high water, and buildings positioned back from the active, moving beach, buy decades of margin against both surge and a shoreline that will not stay where the survey found it. A flat, low island whose highest ground is barely above the tide is a different long-term proposition from a high one with rock and reef to protect it, and that difference should be read into the price. It is one of the quieter judgements we weigh in the quiet market.

Continuity for an income island

If the island earns, from a resort or villa rental as covered in island income and resorts, resilience acquires a commercial dimension. A storm that closes an operation for a season destroys revenue as well as fabric, and the payroll for the team may continue while the income stops. Business-continuity planning, meaning business-interruption cover where obtainable, a reserve sized to the lost season, hardened systems that shorten the closure, and a rebuilding plan drawn before the storm rather than after, is what separates an operation that reopens from one that does not. The same principle runs through the whole subject and through our wider note on the true cost of ownership: the storm is not an unlikely event to be insured against and forgotten, but a recurring fact of the location to be designed for, funded for, and planned around.

Handled with clear eyes, storm risk is manageable, and a well-built, well-reserved, sensibly insured island is a durable thing. Handled by hope, it is the fastest way to turn a beautiful asset into a ruin. When you are assessing a specific island's exposure, or preparing the resilience case before you buy or register one, our office is glad to help you read the weather before the brochure does the talking.

General orientation, not legal, tax or insurance advice. Enquiries: the enquiry form.