When I ran my agency, the hardest calls were the ones I made on my own. Whether to let go of a client who paid the wages. Whether the hire I could not afford was the hire that would save me. A team of people looked to me for the answer, and nobody in the room had run the business I was running. I made those calls in a vacuum for years, and I got a fair few of them wrong.
That is the gap a good mastermind fills. Podcasts are the free tier of learning, and I have already gone through the best podcasts for agency owners. A room of other owners is the paid tier. You stop guessing on your own, and you start borrowing scar tissue from people who have already stood where you are.
Here is an honest guide to the best masterminds and communities for UK agency owners in 2026. Since it is my site, I will put my own room on the list and be straight about where it fits.
The Growth Room (mine, so read it with that in mind)
I run The Growth Room, group coaching for agency owners doing £100k a year and up, with no cap above that. It is weekly. Every Tuesday you get a live call with me and a small room of owners at your stage, plus the full frameworks library my 1:1 clients work from, a monthly business review and a guest expert each month. It runs on the same six pillars as my scorecard, so the work is diagnosed, not guessed.
The part that separates it is the day-90 guarantee. We score your weakest pillar on day one, re-score it at day 90, and if you have shown up and run the moves and the number has not shifted, you leave and the instalment comes back to you. No other room I know of will put a number on the outcome.
The founding price is £750 a month, locked for life, and the founding window closes on 15 October 2026. The first live session is Tuesday 1 September 2026. If you want the honest fit check, it is all on the Growth Room page.
UK communities built around peer support
The Agency Collective. The largest community of agency owners in the UK, a certified B Corp, and going more than a decade. Nearly 500 leaders, with groups meeting in person in London, Bristol, Manchester and Edinburgh. You get monthly expert calls, an active Slack, bi-monthly founder groups led by an agency mentor, and an employee assistance programme that extends to your team’s mental health too. It leans broad and warm rather than tightly coached, which suits owners who want peers and real friendships more than a structured programme. Pricing is on application.
Agency Hackers. The other big UK community, pitched at larger agencies. The typical member runs 15 to 60 people and £2m to £6m, though they will take you outside that band. Membership covers your whole team, not just you, and gets you private Slack and WhatsApp groups, 25 to 30 live sessions a quarter, an archive of more than 700 recorded sessions, and an Agency Board of 10 to 12 handpicked leaders that meets face to face four times a year. Pricing is published: £250 a month standard, £450 a month for agencies over 50 people. If you are past £2m and want a deep library and a wide network, this is the obvious one.
Coach-led masterminds and peer groups
GYDA. A UK coaching firm, running since 2017, that has worked with more than a thousand agencies across 20-plus countries. GYDA is more coach-led than the pure communities: peer masterminds sit alongside 1:1 coaching, board-level advisory and agency diagnostics. Good if you want a facilitator steering the conversation rather than a table of peers left to their own devices. Pricing is on application.
Setup Agency Mastermind. A US programme run by Joe Koufman for marketing agency owners with 10 to 50 staff. Small forums of 6 to 8 non-competing agencies, moderated monthly, with a private Slack group and an annual gathering in Atlanta. The commitment is a minimum of twelve months and under two and a half hours a month of calls. Pricing is published at $1,500 a month, so budget for the dollar exchange and the fact the room runs on US time.
Agency Mastery 360. Jason Swenk’s US mastermind, built around three live events a year and a large back catalogue of systems and training. It suits owners who want the American scale-and-systemise playbook and do not mind that the room and the events are US-centred. Pricing is on application.
Agency Management Institute. Drew McLellan’s US operation, best known for its owner peer groups, run both in person and virtually, with separate tables for COOs, CFOs and, now, AI. This is the traditional advisory-board format done well, aimed at owners who want a structured peer table rather than a coach in the chair. Pricing is on application.
One honest aside before you shortlist. A couple of names you will see recommended next to these are not rooms at all. Sakas & Company, for one, is strong 1:1 advisory rather than a group you sit in every week. That is a different purchase, and the right one for some owners, but do not line it up against a mastermind and compare the monthly price. You are buying two different things, and the value shows up in different places.
For earlier-stage founders
Agency Mastermind. A smaller, mentor-led group (the .co.uk name sits over a Dubai-registered parent) pitched at founders who already have a team or contractors but are earlier in the journey. One 60-minute call a month, a Slack group for accountability, and quarterly guest sessions in place of the regular call. Pricing is published at $200 to $300 a month depending on cadence, which makes it one of the cheaper ways to sit in a room with other owners. If you are not yet at £100k, this or a free community is a more sensible start than a premium mastermind.
How to actually choose
Do not pick on brand, and do not pick on who has the loudest founder. Pick on four things.
Stage. A room full of £5m agencies will talk about problems you will not have for three years, and you will feel it. A room full of freelancers will not stretch you. Find the one where you sit in the middle of the pack, not the top and not the bottom.
Format. A big community with a 700-video library is brilliant if you learn by browsing and dipping in. It does nothing for you if what you actually need is someone sitting across from you holding you to a decision. Be honest about which of those you are.
Accountability. The rooms that change anything are the ones that check whether you did the work. A Slack group you can ignore will get ignored. Ask what happens between the calls, and whether anyone notices when you go quiet.
Coach-led or peer-led. A peer group gives you a table of people at your stage and the collective read of the room. A coach-led room gives you someone who has run the business you are running and will say the uncomfortable thing. Peers tend to be cheaper and warmer. A coach tends to be sharper and pushes harder. Which you need comes down to whether your problem is loneliness or a specific constraint you cannot name. If you are unsure which it is, I have written a plain answer to whether you need a coach or a peer group.
Where to start
If you are weighing up a room and you cannot say out loud which part of your agency is costing you the most, that is the thing to fix first. Take the Agency Scorecard. It scores your business across the six pillars in a couple of minutes and names your weakest one. Walk into any of these rooms knowing that, and you will get ten times the value out of it, mine included.