A chapter at 20 members operates differently from a chapter at 40 members. Most leadership teams do not realise this until they have already lost what made the chapter work at 20.
The hard part of growth is not getting from 20 to 40. The hard part is staying recognisable to yourself when you arrive.
The 20-member chapter
At 20 members, everyone knows everyone. One-to-ones overlap. The leadership team can sit around one cafe table on a Sunday morning and cover every member's situation in under an hour. The President personally notices when a member misses three weeks. The room laughs at the same jokes. Visitors are introduced to everyone within the first half-hour.
This is not just a small version of a 40-member chapter. It is a different organism. It runs on shared context, not process. Most decisions get made informally between meetings. The chapter has a culture, and the culture exists because there is a small number of people in the room.
The 40-member chapter
At 40 members, you cannot sit around one cafe table. Two members can attend for six months without ever doing a one-to-one. The President knows the names but does not know the day-to-day stories. The leadership team has to be deliberate about communication because nothing reaches everyone by osmosis any more.
What worked at 20 does not work at 40. You need actual systems. You need a real onboarding programme, a tracked one-to-one rotation, a documented handover for every role. The chapter has to grow infrastructure to compensate for the loss of automatic intimacy.
The middle is where chapters break
The dangerous zone is between 25 and 35. This is where chapters look like they are growing nicely but lose what made them work in the first place. The leadership team is still operating in 20-member mode (informal, by feel) but the chapter is now too big for that mode to actually work.
Symptoms to watch for in the middle of the growth curve:
- New members who joined six months ago still feel like newcomers. They have not been folded into the chapter's social fabric.
- One-to-ones become clumped. The same eight people do one-to-ones with each other constantly, while the other 22 do them rarely.
- Members start describing the chapter as "good but a bit cliquey".
- Referrals are increasingly given inside the original 15-member core, even though the chapter is now 32.
- The leadership team feels stretched but cannot quite name why.
If three of these are true for your chapter right now, you are in the middle. The growth pause that follows usually shows up at member 33 or 34, when the chapter mysteriously stops attracting visitors and the President cannot figure out why.
What to do at member 25
The cheapest place to act is early. At 25 members, the chapter still has the old culture but the warning signs are starting to appear. Here is what to do:
Move from informal to lightly-formal communication
Stop relying on "everyone knows" for chapter news. Put it in writing. A two-paragraph weekly update from the President, sent the night before the meeting, covering: this week's speaker, who is presenting next week, any chapter news, one specific ask. Total reading time under two minutes. This single change carries the chapter from 25 to 40 without losing alignment.
Run a paired one-to-one programme
Once a quarter, randomly pair every member with someone they have not had a one-to-one with in 12 months. Publish the list. Give a 60-day window. This breaks the clumping and forces fresh combinations. Resistance will be low because the pairing is structural, not personal.
Make the speaker roster visible six weeks out
Most 25-member chapters know next week's speaker but nobody knows who is on in five weeks. At 25, that does not matter much. At 35, it matters a lot, because members cannot pre-plan one-to-ones around upcoming speakers. Publish the speaker roster six weeks ahead and the chapter starts to feel organised even as it gets bigger.
What to do at member 32
This is the inflection point. The chapter is now big enough that the old patterns will not carry it. Hard decisions about structure usually happen here.
Formalise the onboarding programme
At 20, sponsors handle onboarding informally. At 32, this stops working because sponsors get distracted. You need a written 30-day programme with checkpoints, an assigned onboarding buddy, and a membership committee member who explicitly owns each new member's first 90 days. The programme does not need to be elaborate. It needs to be written down.
Split the membership committee into sub-roles
A 20-member chapter's membership committee is three or four people who do everything. At 32, you need to split: one person owns applications, one owns at-risk members, one owns visitor experience. The VP coordinates. Without this split, the membership committee starts dropping things, usually the at-risk pile, which then becomes the source of the next round of departures.
Create the optional pre-meeting
One of the things that makes 20-member chapters feel intimate is the unstructured pre-meeting chat. At 32, pre-meeting time gets crowded. Some chapters have found success creating an optional 6:30am breakfast for whoever wants it, separate from the meeting room. It re-creates the small-group intimacy without forcing the whole chapter to arrive earlier.
What to protect at all costs
A few things you cannot afford to lose, no matter what size the chapter grows to:
- The President's first-name knowledge of every member's spouse, kids and basic life events. If the President cannot say "how is your father doing?" to a member whose father had surgery six weeks ago, the chapter has lost something it cannot get back. This is not about memory. It is about prioritisation. Block 15 minutes a week to write down what you learned about members this week.
- The first ten minutes of the meeting. At any size, the energy in the first ten minutes is the leading indicator of chapter health. Protect it ferociously.
- The handshake at the door for visitors. A visitor walking into a 40-member chapter should not feel any different from walking into a 20-member chapter. The visitor host coordinator and the leadership team need to expand the welcome ritual to keep pace with chapter size, not compress it.
The size that suits the chapter
One last thing. Not every chapter should be 40 members. Some businesses run better at 22. Some at 50. The leadership team's job is to figure out what size produces the best meeting for this particular chapter, not to chase a number set by a regional benchmark.
If your chapter is happiest at 28, stay at 28. If your chapter is built for 45, build the infrastructure for 45. The goal is not the headcount. The goal is the chapter feeling like itself, just with a few more people in the room.
Grow on purpose. Protect the things that made it work. Build the structure to compensate when intimacy starts to thin. The chapters that get to 40 with their culture intact did the work in the middle.