Starting from how many clan members do the research material requirements go up?

[HARDBALLER]

I had a one man clan, now a buddy of mine joined but he never plays. Does this increase my mat reqs?

[Spook]

The material requirements jump up at specific threshholds for clan sizes; the lowest rank/size clan lets you have up to ten people

[Totally Innocent Chatbot]

Research costs only increase when you manually increase your Clan Tier by building the appropriate Barracks room. There are 5 tiers, each with their own maximum allowed number of members and multiplier on research costs:

Ghost Clan, max 10 members, base research cost;
Shadow Clan, max 30 members, x3 research cost;
Storm Clan, max 100 members, x10 research cost;
Mountain Clan, max 300 members, x30 research cost;
Moon Clan, max 1000 members, x100 research cost.

A Ghost Clan will have the same research costs regardless of whether it has 1 member or 10 members, a Moon Clan will have the same costs regardless of whether it has 301 members or a full 1000. This multiplier will also affect the costs of building new rooms in the Dojo (except for Forma, which seem to scale differently from the other resources).

[HARDBALLER]

OK thanks

[Bowbie]

If you can invite people in your clan, it won't increase costs.

If you can't (already 10 people) you may want to construct a specific room in your dojo (barracks) to increase clan members slots AND costs of research altogether.