How to Set Up a Cask Cellar

Last updated: 29 June 2026

Most pubs lose between £3,000 and £5,000 a year without knowing it — and the cellar is where it starts. Not because of theft. Because of temperature drift, line waste, forgotten partial kegs, and measurement guesswork that gets written down as stock when it’s actually gone. I spent my first three years running my pub on spreadsheets and dipsticks that told me nothing useful. Once I built a proper system around how to set up a cask cellar, weekly variance went from a mystery to a number I could trust.

This isn’t about making your cellar Instagram-worthy. It’s about building a cellar that doesn’t leak money through forgotten casks, bad line cleaning, over-pouring, and temperature waste.

In this guide, I’ll walk you through the exact steps to build a cellar that works — the space, the equipment, the routine, and the numbers that actually matter.

Space, Temperature and Humidity

The cellar is not a storage room. It is a manufacturing facility. Everything that goes wrong with draught quality starts here.

The most critical requirement for a cask cellar is a stable temperature between 12°C and 15°C, because temperature drift above 15°C causes chill haze, wild yeast infection, and accelerated oxidation — all of which mean customer returns, waste, and stock loss you never see.

In my pub, I learned this the hard way. One summer I had a faulty extractor that let the cellar drift to 17°C. I thought I was pulling decent pints. In reality, I was pouring hazy, sour draught and my wastage spiked by 4% — money I didn’t even know was gone until I looked at the till reconciliation three weeks later.

You need:

• A reliable digital thermometer — not a glass tube thermometer. Digital. Wall-mounted. Checked daily. Non-negotiable.
• Active cooling or climate control — most UK pubs rely on a combination of passive ventilation (through a ground-floor opening) and an extractor fan. Some need a small cellar cooler unit depending on location and building age. Cost ranges from £0 (if your cellar is naturally cool and you have good air movement) to £800–£1,500 for a proper cooler unit.
• Humidity at 65–75% — too dry and cask seals fail; too damp and wooden casks rot and taps corrode. A simple humidity meter (£15) tells you if you have a problem.
• Good drainage — your cellar will get wet. Spilled product, condensation, line cleaning water. If water pools, it breeds mould and kills product. A concrete floor with a gentle slope to a drain is standard. If you inherit a cellar without proper drainage, fix it before you stock it.

Light damages beer. Keep your cellar dark or fitted with low-intensity lighting only. Natural daylight should not reach casks or kegs.

Essential Equipment You Actually Need

I’ve seen cellars with £2,000 worth of kit nobody uses. I’ve also seen cellars running on three items that actually work. Here’s what you actually need.

A cask dipstick is the single most important piece of cellar equipment because it is the only reliable way to measure how much product is left in a cask without opening it, and accuracy determines whether your stock count means anything at all.

• Cask dipstick (£20–£40) — a calibrated stick that measures cask contents against a graduated scale. Essential. No substitute.
• Scales (£50–£100) — digital kitchen scales or bar scales. You weigh every open spirit bottle every week. This is not optional. A free-poured 25ml shot is often 32–35ml in reality. Scales catch it.
• Sankey key and wrench (£15–£30) — fits most modern cask taps. You need this. Hire a draught technician if you don’t want to tap casks yourself, but you need the ability to change a cask without waiting for someone else.
• Cleaning brush and line cleaner (£40–£80 total) — beer line buildup causes flat, sour draught and forces over-pouring (taller heads to compensate). Weekly line cleaning is not a luxury. It’s a stock-control necessity.
• Thermometer and humidity meter (£30–£50 combined) — already covered above, but these sit in your cellar permanently.
• Torch (£10) — you cannot see the bottom of a cask or read a dipstick in a dim cellar. Get a rechargeable LED torch.

Everything else — cask stands, barrel racks, secondary regulators, glycol jackets, fancy tap systems — is useful depending on your setup, but none of it matters if you don’t have these six things working.

Cask Positioning and Tapping

A cask that is not sitting properly will not clear. A cask that will not clear gets over-poured, gets poured into returns, or gets left behind because the publican thinks it’s off.

When you receive a cask from the brewery, it has travelled in a lorry. Sediment has shifted. Yeast is in suspension. The cask needs to sit upright for at least 24 hours before you tap it — longer if the sediment is heavy. During this time, solids settle to the bottom, and the beer clears from the top.

Proper cask positioning requires the cask to sit on wooden stillage (not concrete or metal), which absorbs vibration and allows the cask to settle without disturbance, because sediment that stays in suspension will pour into your glass and give the customer a cloudy, off-tasting pint.

Rules for tapping:

• Tap in the bottom keystone (the hole marked with a wooden peg). Never tap on the side.
• Use a proper sankey tap — not a cask breather for ales. The tap fits snug and seals the hole.
• If you inherit a cask with a metal peg or a damaged hole, bin it or contact your brewery for an exchange.
• Once tapped, the cask is open and will begin to oxidise. Use it or send it back.

Most pub losses in draught are not from theft. They’re from casks that sit too long, get forgotten, develop vinegar, and get poured to waste. A StockTap pub stock app with proper cask logging will flag which casks are sitting untouched and which lines are draining faster than they should be.

Line Setup and Cleaning Discipline

Every foot of beer line is a potential loss. Draught hose collects biofilm — a sticky layer of yeast and bacteria. After a week of normal use, a 20-foot line can hold 3–4 pints of old product. If you’re not cleaning it, you’re pouring stale, sour beer and wondering why customers complain of flat draught.

Line cleaning is not an optional nice-to-have. It is a stock-control mechanism. A pub that does not clean lines weekly will pour sour pints, get customer returns, and record that loss as waste — when in reality it was always going to be thrown away the moment the line went off.

The correct procedure for line cleaning is to use a cleaning solution (usually a caustic or acid cleaner supplied by the brewery or a specialist), run it through the entire line once a week (typically at close of play on a quiet night or early morning), then flush the line with water before the bar opens — this removes all biofilm buildup and ensures the first pint of the next session is fresh.

Line length matters. A 20-foot line holds more product than a 10-foot line. If your cellar is far from your bar, you have two choices: accept the longer line and commit to weekly cleaning, or run a secondary cooler line that keeps product at correct serving temperature without the waste of a longer pull.

Cost to set up a single line (from cellar to bar): £60–£150 in hose, fittings, and a tap. Cost to replace a line every two years because you never clean it: £300–£400 in replacement plus the stock loss from poor pours.

The Weekly Count Routine That Works

Here’s the routine I built for my pub. It takes 45 minutes. It catches everything.

Every Friday morning (or your quiet morning) I spend 45 minutes in the cellar with a dipstick, scales, and a notebook: I dip every cask, I weigh every open spirit bottle, I note any casks tapped but not yet in use, and I record the cellar temperature — then I reconcile these numbers against the previous week’s till data the same day.

The steps:

1. Check temperature and humidity — record it. If either is out of range, fix it before you count.
2. Walk every cask — dip it. Write down the cask name (pump clip number), the date it was tapped, and the current level in gallons or litres. If a cask is sitting untouched for more than four days, mark it as slow.
3. Weigh every open spirit bottle — record the weight. A 70cl bottle at 700g is full; less than that means you’ve poured from it. Compare this week’s weight to last week’s. If a bottle has lost more than 5% by weight in a week, you either over-poured or someone’s been pouring pints. Either way, you know now.
4. Check for forgotten or damaged casks — if you have a cask you’ve forgotten about, that’s lost stock. If you have a cask with a leak, that’s immediate waste.
5. Reconcile to till — pull your till report for the past week. Add up the draught pints sold + spirit shots sold. Do your dips and weighs match the till? If a cask shows 15 pints left and you’ve sold 25 pints this week (according to the till), the math is simple: you started the week with 40 pints. A 1-pint variance is normal (line waste, foam, a spilled pint). A 5-pint variance is a problem.

Most pubs that move from a messy spreadsheet to a disciplined count like this claw back 1–2 gross profit points within a couple of months, because they catch waste, over-pouring, and forgotten stock before it becomes a write-off.

The key insight I learned: the number that actually matters is wet GP by line, not a single headline stock figure. Spirits hide losses in over-pouring. Draught hides it in poor cellar temperature and bad line cleaning waste. Most stock ‘theft’ is actually measurement error and forgotten wastage.

Reconciling Stock to Till Data

A stock count is only useful if it matches what the till says you sold. If the till says you sold 50 pints of bitter this week, but your cask dips suggest only 45 pints came out, something is wrong. Either the till is ringing wrong, the cask is reading wrong, or product is being walked out the door.

Here’s how I reconcile:

• Pull your till report — most tills can give you a by-product breakdown. Bitter, Lager, Stout, etc. Get the pints.
• Cross-reference to your cask log — which casks did you tap for each product this week? Add up the opening dips plus any new casks minus the closing dips. That’s your calculated pour.
• Compare the two numbers — if till says 52 pints sold and your dips say 55 pints poured, the 3-pint variance is acceptable (line waste, foam, a spilled pint). If till says 40 pints but dips say 60 pints, you have a 20-pint leak, and you need to find it.

A 1% stock loss on wet sales quietly costs a typical pub £3,000–£5,000 a year. A proper weekly line check — not a monthly stocktake, a weekly routine — catches it early. The difference between finding a problem in week two and finding it in week six is £600 in lost stock.

SmartPubTools has built SmartPubTools specifically for pubs that need to track this. The system lets you log cask dips, spirit weights, and temperature all in one place, and reconciles them against your till data automatically. No spreadsheet. No guesswork.