Hi not in St Albans, but I held my daughter's 1st birthday at The Hive, Jim McDonald Centre in Hatfield. There's the option of either softplay for 15x kids (including adults the total people allowed was 25) up to age 6 or bouncy castle for I think older kids I can't remember. The soft play was a nice small space for us.
Thank you ladies. Really appreciate your help
Fave Uk (look on Instagram). They will be hiring their space on weekends x
If you're looking for community centre type vibes you could look at fleetville community centre, the jubilee centre or cottonmill community & cycling centre- we looked at those venues when booking a party with Little City x