Britain’s heatwaves are draining billions from small businesses

While millions of us have been searching for shade, Britain’s small businesses have been counting the cost. Heatwaves are no longer just uncomfortable—they’re becoming an economic hazard that slows productivity, cuts sales and pushes up costs all at the same time. From builders forced to down tools and cafés battling soaring refrigeration bills to retailers watching customers stay away, extreme heat is quietly taking billions out of the economy. The Office for National Statistics estimates hot weather already costs the UK around £1.2 billion in lost productivity every year. For the small and micro businesses with the thinnest margins and the least protection, every degree on the thermometer can mean another slice off the bottom line.

Photo by M K on Unsplash

When the mercury rises the revenue drops

While we’ve been broiling in the heat small businesses have been bleeding income. Heatwaves significantly affect UK small and micro business productivity and revenue, and the evidence is now strong, consistent, and worrying. The impact is bigger, broader, and more expensive than most policymakers realise and it’s getting worse each year. As we cool down over the coming week many small businesses will be counting the costs and bracing for the next temperature increase.

UK heatwaves cost the economy £1.2 billion a year and small businesses are hit hardest

The Office for National Statistics shows hot days (28°C+) reduce UK productivity by £1.2 billion per year, even after assuming some are adapting by installing air conditioning.

Small and micro businesses which make up 99.6% of all UK firms and operate in heat‑sensitive sectors like retail, construction, hospitality and agriculture, absorb the majority of this loss.

Productivity drops sharply, especially in outdoor and manual sectors

• Workers take more breaks, slow down, and struggle with heat stress. Example: traffic system installers report jobs take longer because staff must repeatedly cool down.

• Infrastructure failures (melted tarmac, bent rail tracks, signal failures) disrupt travel and delay staff and deliveries.

• London Underground temperatures exceed street level by 5°C, making commuting harder and reducing worker effectiveness.

Small businesses struggle with:

• Missed deadlines

• Reduced output

• Higher labour costs per job

• Increased sick days and heat‑related absences

• Lower concentration and slower pace for home‑based micro businesses

ONS modelling confirms that hot days materially reduce labour effectiveness across the economy.

Revenue falls for many small retailers and hospitality businesses

• Footfall in UK city centres fell 25% during the July 2022 heatwave.

• Visits to UK shops fell 1.8% last month; overall footfall dropped 3% year‑on‑year during hot spells.

• Greggs issued a profit warning due to weaker demand for baked goods in hot weather; Dr Martens also reported heat‑related sales drops.

• Small food businesses report customers avoid heat‑sensitive products (e.g., chocolate, cakes).

Small businesses report:

• Lower walk‑in sales

• Reduced demand for hot food, baked goods, and indoor leisure

• Higher spoilage of perishable stock

• Increased refrigeration costs

• Lost revenue from cancelled bookings or reduced trading hours

Agriculture and rural micro businesses suffer severe losses

• Heatwaves cut grass and grain yields by as much as half on some farms.

• Lower yields reduce revenue for farmers and contractors (e.g., fewer baling jobs).

This leads to:

• Sharp revenue drops

• Higher feed costs

• Reduced cashflow for rural micro‑enterprises

• Knock‑on effects for local supply chains

Costs rise even when sales rise

Heatwaves increase:

• Energy costs (fans, coolers, refrigeration)

• Spoilage and waste

• Staff welfare costs (hydration, PPE, shade breaks)

• Air‑conditioning or cooling equipment purchases

• Insurance risks (equipment overheating, fire risk)

The ONS notes that UK homes and workplaces are not designed for heat, making adaptation expensive and slow.

The overall economic impact is large and disproportionately borne by small firms

• ONS estimates hot days could reduce UK productivity by £5.3 billion in extreme years (e.g., 2020).

• Average annual productivity loss: £1.2 billion.

Small businesses:

• Lack cooling infrastructure

• Rely on physical presence (shops, cafés, salons, trades)

• Have smaller cash buffers

• Can’t easily shift operations to cooler hours or remote work

• Depend heavily on local footfall

• Operate in heat‑sensitive sectors (retail, hospitality, construction, agriculture)

Large firms can absorb seasonal swings; small firms cannot.

Productivity impact:

Moderate to severe. especially in outdoor, manual, food, retail and home‑based micro businesses. The ONS estimates national productivity losses of £1.2bn per year, with small firms absorbing the majority.

Revenue impact:

Highly variable but often negative. Retail footfall drops up to 25%, food businesses see demand collapse, and agriculture can lose 50% of yields.

Cost impact:

High: cooling, spoilage, staff welfare, and energy costs all rise.

Overall:

Heatwaves are now a material economic threat to small and micro businesses, reducing productivity, depressing revenue, and increasing costs simultaneously.

How different sectors are affected:

Retail (High Street & Independent Shops)

Productivity:

• Staff fatigue slows service

• Stock handling becomes harder (especially in non‑air‑conditioned shops)

Revenue:

• Footfall drops sharply in city centres during extreme heat

• Sales of heat‑sensitive goods fall (chocolate, baked goods, cosmetics)

• Sales of seasonal items spike (fans, paddling pools, cold drinks)

• Spoilage increases for perishable goods

Net effect: Volatile: some independents gain, many lose.

Hospitality (Cafés, Restaurants, Pubs, Takeaways)

Productivity:

• Kitchens become dangerously hot

• Staff need more breaks

• Higher sickness/absence

Revenue:

• Outdoor venues gain

• Indoor venues lose footfall

• Food spoilage rises

• Energy costs surge (fridges, freezers, fans)

Net effect: Mixed: heat boosts cold drink sales but raises costs and reduces indoor dining.

Trades & Construction (Builders, Landscapers, Electricians, Plumbers)

Productivity:

• Work slows due to heat stress

• More hydration and shade breaks

• Some tasks must be rescheduled

• PPE becomes uncomfortable

Revenue:

• Fewer jobs completed per day

• Delays reduce weekly income

• Some clients postpone work

Net effect: Negative: productivity drops significantly.

Personal Services (Hair, Beauty, Wellness)

Productivity:

• Staff fatigue

• Reduced appointment capacity

Revenue:

• Drop in long indoor treatments

• Rise in quick services (barbering, nails)

• Higher cooling costs

Net effect: Slight decline, unless businesses adapt hours.

Food Businesses (Bakeries, Delis, Small Producers)

Productivity:

• Heat makes production harder

• Staff struggle in hot kitchens

Revenue:

• Spoilage increases

• Demand for hot food drops

• Cold food demand rises

• Delivery windows tighten

Net effect: Negative: spoilage + lower demand for core products.

Agriculture & Rural Micro‑Enterprises

Productivity:

• Heat reduces crop yields

• Livestock stress increases

• Outdoor work slows

Revenue:

• Yields can fall by up to 50% in extreme heat

• Higher feed and water costs

• Reduced supply for local markets

Net effect: Severe: heatwaves directly cut output and income.

Home‑Based Micro Businesses (Freelancers, Creatives, Consultants)

Productivity:

• Poor sleep reduces focus

• Home offices often lack cooling

• Heat reduces concentration

Revenue:

• Deadlines slip

• Reduced billable hours

Net effect: Moderate: productivity drops even if revenue is stable.

Logistics, Deliveries & Mobile Services

Productivity:

• Drivers face heat stress

• Vehicle overheating

• Slower routes

Revenue:

• Missed delivery windows

• Higher fuel and cooling costs

Net effect: Negative: operational disruption + higher costs.