For years, the conversation around moderation has focused on alcohol-free beer. But another category is quietly carving out a place on bars across the UK: session-strength beer.

Typically sitting below 3.5% ABV, these beers are offering drinkers a way to enjoy the flavour and social experience of beer while consuming less alcohol. At the same time, they are creating new opportunities for brewers and pub operators, helped in part by the UK's strength-based Alcohol Duty system.

The introduction of a strength-based Alcohol Duty system in August 2023 fundamentally changed the economics of brewing lower-strength beer. Rather than taxing products by category, duty is now linked more closely to alcohol content, meaning beers between 1.3% and 3.4% ABV attract significantly less duty than those at 3.5% ABV and above.

While duty rates have been uprated since the reforms, the structure has remained in place, continuing to incentivise brewers to invest in lower-strength beers.

Brewers have been quick to respond

The impact of the reforms can already be seen across the market.

A peer-reviewed study published in Drug and Alcohol Review found that by 2025, almost one in four beers sold by volume in Great Britain (23%) was below 3.5% ABV. Researchers concluded that much of this growth came from existing brands reformulating their products to sit below the new duty threshold, rather than entirely new beers entering the market.

Alongside reformulations, brewers have also expanded their session-strength ranges.

In November 2024, Carlsberg Marston's Brewing Company launched Shipyard American Session Pale Ale at 3.4% ABV, describing it as a refreshing, flavour-led addition to the category.

The company followed this with the launch of Hobgoblin Session IPA in cask in early 2025. Announcing the launch, Carlsberg Marston's revealed Hobgoblin cask sales had increased by 76% year on year, with Hobgoblin Session IPA becoming the fastest-growing national ale brand over a 12-week period according to Nielsen. Marketing Director Jo Marshall said the launch would provide "even more choice to operators and their customers."

Elsewhere, Adnams introduced Ghost Ship Session IPA at 3.4% ABV, while St Austell Brewery continues to invest in the category with Anthem, its session pale ale.

A growing commercial opportunity

The growth of session beer isn't being driven by tax alone. It also reflects changing drinking habits.

Many consumers are looking to moderate their alcohol intake without giving up beer altogether. Session-strength products offer an alternative to both full-strength and alcohol-free beers, allowing drinkers to enjoy longer social occasions while consuming less alcohol overall.

The growing appeal of mid-strength beer is also being recognised beyond traditional brewing circles. In 2025, YouTube food community Sorted Food partnered with Small Beer to launch Blanche, a limited-edition 2.5% ABV wheat beer developed with input from both communities.

Announcing the collaboration, Small Beer co-founder James Grundy said: "Blanche is more than just a beer, it's a celebration of our shared values with Sorted Food. This is a beer made for the modern drinker – those looking to strike the right social lifestyle balance."

The collaboration demonstrates how lower-strength beer is increasingly being positioned not as a compromise, but as a flavour-led choice that complements food, social occasions and more balanced drinking habits.

Industry data also suggests the category is gathering pace. Reporting on figures from drinks market analysts IWSR, the Financial Times reported that UK sales of beer below 3.5% ABV doubled between 2022 and 2023, making Britain the fastest-growing major market for lower-strength beer during that period.

The growing momentum behind mid-strength beer is also being recognised by major retailers. In May 2026, Marks & Spencer announced it was expanding its own-label mid-strength beer range with four new beers between 2.8% and 3.2% ABV, increasing its overall mid-strength offer across beers, wines and spirits by 25%. The retailer cited research showing that almost a quarter (24%) of UK consumers choose lower-strength alcoholic drinks more often during the summer, while 76% say health is a key driver for limiting alcohol consumption.

Caroline Thompson-Hill, Head of Beers, Wines and Spirits at M&S, said: "We're seeing a clear shift in how customers think about alcohol. Many people aren't looking to stop drinking altogether, but they do want more control over how much they drink, particularly during summer when social occasions tend to increase. That's why we are bringing out four, truly 'sessionable' beers which offer the same great taste, at lower strengths."

For pubs, the trend presents an opportunity to broaden beer ranges and appeal to customers seeking more choice without sacrificing flavour or the social experience. As brewers continue to invest in the category and the current duty structure continues to reward lower-strength products, session beer looks increasingly likely to become a permanent fixture on the bar rather than a passing trend.