Home Brew Beer — Frequently Asked Questions Answered

These are the questions we get asked most often at BrewCo UK — in our shop in Sowerby Bridge, by email, and via our website. We've answered each one as directly as possible so you can find what you need quickly.

How long does home brew beer take to ferment?

Home brew ale ferments in 7–14 days at 18–22°C. The first 3–5 days are the most active phase; activity then slows but fermentation continues. Always confirm fermentation is complete with a hydrometer — two identical readings 24 hours apart mean it's safe to bottle. Never rely on airlock activity alone.

How many pints does a home brew kit make?

Most standard home brew beer kits make 40 pints (23 litres) of finished beer. Some premium kits make 32–36 pints. The number is printed on the kit packaging. A 23-litre batch fills approximately 46 x 500ml bottles or 40 x 568ml pint bottles.

Can you drink home brew straight away?

No. Home brew beer needs a minimum of two weeks in the bottle after bottling to carbonate and condition properly. Drinking it earlier produces flat, harsh, unfinished beer. Most ales are best after 3 weeks; stouts and porters improve significantly at 4–6 weeks.

What sugar should you use for home brewing?

Use brewing dextrose rather than household white sugar. Dextrose ferments cleanly without producing cidery off-flavours. Better still, use Brew Enhancer 2, which adds body and head retention as well as fermentable sugar — the single most effective upgrade for any beer kit.

Why is my home brew beer flat?

Flat home brew is almost always caused by one of three things: bottling before fermentation was complete, not enough priming sugar, or bottles not sealed properly. Always confirm fermentation is finished with a hydrometer, use the correct amount of Carbonation Drops (one per 500ml), and check that crown caps are crimped fully with a proper beer capper.

Why is my home brew cloudy?

Cloudiness in home brew is usually caused by yeast still in suspension, protein haze, or chill haze (which forms when cold). To clear it, add Beer Finings 48 hours before bottling, then cold crash (cool to 2–4°C) if possible. Using Protafloc Tablets in the boil also prevents protein haze forming in the first place.

What temperature should I ferment home brew at?

Ferment most beer kits at 18–22°C. Below 15°C and fermentation slows or stalls; above 24°C and the yeast produces fruity esters and fusel alcohols that cause off-flavours. A stable temperature within the 18–22°C range produces the cleanest, best-tasting result. Use a stick-on thermometer on your fermenter to monitor.

How do I know when home brew is ready to bottle?

Take two hydrometer readings 24 hours apart. When both readings are identical and match the expected final gravity stated in your kit instructions, fermentation is complete and it's safe to bottle. This is the only reliable method — never bottle based on time alone or airlock activity.

Do I need a hydrometer for home brewing?

Yes — a hydrometer is essential. It's the only way to confirm fermentation is truly complete before bottling. Bottling too early is the primary cause of over-carbonated bottles, gushing beer, and even exploding bottles. It also lets you calculate your beer's ABV. A hydrometer costs under £4 and lasts indefinitely.

Why does my home brew taste like cider or apple?

A cidery or apple flavour is caused by acetaldehyde — a fermentation byproduct that yeast normally cleans up given enough time. It usually means the beer was bottled too early, fermented too warm, or used too much plain white sugar. Ferment for a full 14 days, use Brew Enhancer instead of white sugar, and condition in the bottle for at least 3 weeks.

How much does it cost to brew beer at home?

A standard 23-litre beer kit batch costs approximately 50–70p per pint in ingredients, including the kit, enhancer, and carbonation drops. Initial equipment costs around £50–55 but lasts for years. Compared to supermarket beer at £1.50–£2.00 per 500ml, home brewing saves roughly 60–70% per pint. See our full cost breakdown guide.

What is the best home brew kit for beginners?

The Coopers DIY Real Ale or Coopers DIY Draught are our top recommendations for beginners. Both are forgiving, produce reliable results, and make 40 pints. Pair with Brew Enhancer 2 instead of sugar for a noticeably better result. If you prefer a premium starting point, the Tiny Rebel CWTCH is an award-winning kit that impresses from the first batch.

How long do you leave beer in the fermenter?

Leave beer in the fermenter for a minimum of 7 days, ideally 10–14 days for most kit beers. Even if the airlock stops bubbling after 4–5 days, the yeast continues cleaning up fermentation byproducts that cause off-flavours. Leaving the beer an extra few days beyond the point of apparent activity costs nothing and improves the result.

Can you add hops to a beer kit?

Yes — dry hopping a kit is easy and produces a dramatic improvement in aroma. Add 25–50g of hop pellets (such as Citra or Centennial) directly to the fermenter after primary fermentation slows, leave 3–4 days, then bottle. See our full dry hopping guide.

Why has my home brew stopped fermenting?

If fermentation appears to have stopped early, first check the temperature — it may have dropped below 15°C. Warm the fermenter to 20–22°C and wait 24–48 hours; it often restarts naturally. If gravity is still well above the expected final gravity after rewarming, try adding Gervin GV7 Restart Yeast with a teaspoon of Yeast Nutrient.

Is home brewing legal in the UK?

Yes — home brewing beer, wine, and cider for personal consumption is completely legal in the UK. There is no licence required and no limit on the amount you can brew for your own use. You cannot legally sell home brew without the appropriate licences. Distilling spirits at home is illegal in the UK regardless of quantity.

What equipment do I need to start home brewing?

The minimum you need is a 25 Litre Fermentation Vessel, Airlock, Hydrometer, Steriliser, bottles, Crown Caps, and a Beer Capper. Total cost for a basic setup is around £50–55. Browse our full equipment range at BrewCo UK.