The first 100 days of a new brewpub

Why the first 100 days decide the next five years

Opening week brings a tap list the menu has already promised, a team still learning the kit and a bar that pours faster than anyone forecast. The first three months set the habits. If batch records, cleaning routines and tasting sessions start in month one, they stay. If they start late, they rarely start at all.

Here is how we split the period with brewpub owners. Treat the dates as a guide. The order matters more.

Before opening: get lager in the tank early

Lager is slow. A German-style Helles or Pilsner needs roughly a week to ten days of primary fermentation at around 9 to 12 °C, a diacetyl rest, then three to four weeks of cold conditioning near 0 °C. Count back from opening day and the first lager has to be brewed at least five weeks ahead, ideally six.

Weissbier and ales are quicker, around two to three weeks from grain to glass, so they fill the gap. A sensible opening line-up for a 10 hl brewhouse is a house lager, a Weissbier and one ale. Hold the fourth tap back until the brewery has shown it can keep three beers consistent.

Use the weeks before opening to write standard operating procedures (SOPs) for brew day, cleaning, yeast handling and transfers. Train the team on them before service puts everyone under pressure.

Days 1 to 30: keep the beer flowing and write everything down

In the first month the job is supply. Plan the brew schedule around fermenter occupancy rather than brew days: a lager ties up a tank for five weeks, an ale for two. Running a beer dry in week three teaches regulars to order something else.

Every batch gets a full record: malt and hop lot numbers, water treatment, mash temperatures, pre-boil and post-boil gravity, volumes, pitch rate and daily fermentation readings. Paperwork never feels urgent during launch week. It becomes urgent the first time a batch tastes wrong and nobody can say what changed.

Start the excise registers on day one as well and reconcile them daily. Our guide to a daily excise routine for brewpubs sets out the habit.

Days 31 to 60: find the variation

By the second month you have enough batches to compare. Lay the records side by side and look at the spread in original gravity, final gravity, days to finish, brewhouse yield and volume into the fermenter. A house lager whose original gravity wanders between 11.5 and 12.5 °P is two beers sold under one name.

Start a small tasting panel now. Three or four staff, the same time each week, tasting the current batch against the previous one and against a written description of the beer. Train them on the faults a lager shows first, especially diacetyl, acetaldehyde and DMS. Our guide to beer off flavours is a good place to start.

This is also the month yeast management slips. Decide how many generations you will repitch before starting from a fresh culture, how you harvest from the cone and how you store and count the slurry. Pitch by cell count, not by the bucket.

Days 61 to 100: cost, cleaning and the first special

Once the beers are steady, look at money. Work out brewhouse yield and total losses from brewhouse to glass. Losses at the tap from foaming, line cleaning and over-pouring often surprise owners more than anything in the brewhouse. Check that dispense lines are actually cleaned on schedule, because dirty lines undo good brewing within days.

Audit the cleaning routine: caustic strength, temperature, contact time and rinse. Only then brew the first seasonal special. A new beer is a reward for a stable core range.

What good looks like at day 100

• Every batch has a complete record a new brewer could follow.
• Core beers hit their original gravity within a tight band, typically about 0.2 °P either side of target.
• A weekly tasting panel meets and its notes lead to changes.
• The excise registers reconcile every day without heroics.
• Someone other than the head brewer can run a brew day from the SOPs.

If two or more of these are missing at day 100, the brewery is running on memory and luck. That is the moment an outside eye earns its keep, before the habits set.