Fire risk in UK homes linked to heatwave conditions

Aviva has issued a fire warning after reporting a surge in fire-related insurance claims during periods of warm weather across the UK.

The insurer said fire claims in April and May 2025 have already exceeded those recorded in any other month this year, with many starting outside the home.

According to Aviva’s analysis of five years of data, the rise in claims correlates with periods of dry weather, high temperatures and increased outdoor activity.

The company attributed the increase in part to seasonal garden use, with fires linked to barbecues, firepits and bonfires among the most common causes.

Aviva noted that lightning-related fire claims have also risen in recent years, with September 2024 recording three times more lightning claims than any other month that year.

Outdoor fire incidents surge during spring months

Aviva stated that April and May 2025 have seen more outdoor fire claims than any other months of the year to date.

The insurer reported that this surge follows unusually sunny spring weather, with higher-than-average sunshine levels prompting greater garden use.

Fire claims linked to gardens include damage to sheds, decking, garages and fences caused by escaped embers or improper disposal of ash.

Aviva provided several examples from recent claims, including firepits reigniting after disposal, barbecue embers landing on sheds, and bonfires spreading to adjacent properties.

The company said the average cost of a garden-related fire claim is close to £16,000.

Data shows increase in lightning-related fire claims

Aviva’s records show a growing number of fire claims caused by lightning strikes, particularly during late summer months.

The insurer found that lightning can cause damage to electrical systems by striking roofs or loft spaces, sometimes sparking fires within homes.

In September 2024 alone, lightning claims were three times higher than in any other month that year.

Aviva stated that claims involving lightning have steadily increased over the past five years, aligning with shifts in seasonal weather patterns.

The company linked this trend to a rise in short-duration but high-intensity summer storms across parts of the UK.

Consumer concerns and fire prevention advice

Aviva commissioned a survey of 2,000 UK residents to understand public attitudes towards seasonal fire safety.

The survey found that 12 percent of respondents worry more about fire risks during hot weather.

It also showed that 13 percent report greater concern during barbecue season.

To support home fire safety, Aviva issued practical advice for households, including warnings on barbecues, bonfires, firepits, lithium-ion chargers and reflective garden items.

The insurer advised against using bonfires during dry or windy conditions and highlighted the fire risk from magnified sunlight through glass objects.

Aviva calls for fire safety awareness as UK sees record spring temperatures

Hannah Davidson, Senior Underwriting Manager at Aviva, said the rise in claims highlights the need for seasonal caution: “Although warmer weather is often welcome news, we’re urging people to remain vigilant when it comes to fire safety.

“The warm weather, paired with a lack of rain means that once started, a fire can spread very quickly – particularly as the ground is dry.

“Popular items in gardens, such as wooden fences and sheds, can be flammable, causing flames to spread quickly.

“A small fire in the garden can also spread to the home, causing significant damage.

“Whether it’s hosting friends for a barbecue, charging devices and tools outside or in the home, or even hanging a mirror outside in your garden for decoration, it’s worth paying close attention to what could become a potential fire hazard.

“With the average fire claim involving a garden amounting to almost £16,000, it’s worth taking out home insurance if you haven’t already, giving you peace of mind knowing that your home and belongings are protected.”

Aviva advised people to unplug appliances once charged, keep reflective objects away from windowsills and properly extinguish cigarettes.

It added that taking simple precautions could help reduce the number and severity of fire claims during warmer months.

Fire warning issued as Aviva links warm weather to rise in UK fire claims: Summary

Aviva has reported that fire-related insurance claims rise during warmer weather in the UK.

Data from the company showed that April and May 2025 saw more fire claims than any other month in the year.

Claims involving gardens, barbecues and bonfires were the most commonly reported.

The average cost of a garden fire claim was reported to be nearly £16,000.

Lightning-related fire claims have also increased over the past five years.

In September 2024, lightning claims were three times higher than any other month that year.

A survey of 2,000 UK consumers found that 12 percent worry about fire safety in hot weather.

Thirteen percent reported concern during barbecue season.

Hannah Davidson, Senior Underwriting Manager at Aviva, advised people to remain cautious during dry conditions.

Davidson said outdoor items such as fences and sheds can quickly catch fire and spread flames.

She also warned that indoor fires may start from overheating devices or magnified sunlight.

Aviva issued several tips to reduce fire risk, including safe disposal of ash and unplugging chargers.

The company said being aware of seasonal fire hazards can help protect homes and belongings.