Some random comments:
As well as potential charity status, look into any local business intiatives such as those under BID schemes etc with partnerships between councils and local business organisations etc
These may have subsidies or waivers on rent & rates for the first year etc
https://en.m.wikipedia.org/wiki/Business_improvement_district
Moveable ‘walls’ are always a good idea. A fairly basic is Heras fencing which can be moved with a covering, a better solution is a framework with either movable wall panels (quite a bit of work), fixed wall panels with a door in every room but hangable panels that block doors, or a framework with panels forming long wide corridors and a mix of wall panels that can be relocated with some effort and doors/panels that can be moved between games
Ensure that game areas are not designed with either attack or defend but a combination of attack & defend - it must be possible for one person to have a last stand, but also that one person doesn’t end up dominating a whole game
Stags/companies/parties:
For rental groups they mostly don’t care if they are sound paintball/.50” paintball/airsoft/laser/nerf.
They are after a fun day out, but they might be looking for a particular one
Utilities:
Particularly when indoors AEG users will be interested in charging facilities - this is an extra cost to your bill but it’s a value added feature.
Neighbours:
Keep everyone happy, ensure they are aware of the activities - banging and shooting noises, and lots of people driving around & parking. (Plus potential smokers/vapers stood around)
Catering:
Vending machines are beaten by having a caterer, but there is a balance between ensuring it’s worth their while to turn up.
If you provide catering then you have to comply with all food prep & storage, if you have a caterer then you only provide a suitable area (clean etc)
Experience training days:
You dont need a true super special ex SAS instructor. You need someone credible who can give an ‘experience’ suitable for the people.
There are many ex forces businesses that will come down and run custom sessions.
Once established or depending on who your staff are then this can be done in house.
Ive attended events with experience sessions by training companies, by trade staff, by teams and we have run them with our ex military’s members (one is a former instructor) …. and also without our ex military. We’ve done some ‘real tactics’ but aimed at the context of ‘playing games’ - death is not a consequence, so you can change tactics when the worst case scenario is that you have to respawn
Rental equipment:
You need a minimal number to cover the largest party you will have at one time plus spares for failures.
Diversify:
Your goal may be airsoft, but the more choices you have the better chance of customers:
Airsoft - easy to sweep up
Low impact .50” paintball (springer pump action)
Attracts kids birthday parties. Fairly easy to sweep up, and low level of cleaning - power wash or gardening style backpack pump sprayer
Full .50” paintball
True paintball in the lower .50” calibre
You will need a compressed air system (greater expense) but it’s available for HPA airsofters
This will need more cleaning than the .50” springers
Note that indoors you have the added risk of slips and falls on a hard surface. Paintball residue can be easily washed away with pressure washers etc as long as you don’t have excessive firing going on.
But think about how slippery the floor may be. We’ve gone for sawdust on some indoor games (after testing it for flammability with pyro)
Sawdust adds some slipability by itself, but you should have rules against running to make people step properly
…. Which brings to another safety issue of CQB - oversight
Rooms are very hard to Marshall, both for rules & safety
If you have an overhead platform you can mix ground level and above level - someone to see what’s going on and someone to deal with the emergency