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For those of you who wish to contribute information please be aware that when editing resource costs or times the formula for this is BASEx2^n where n is the level and base is the cost of a lvl 1 building. In lay-man's terms that is Double the previous level's cost. This is for both Resources AND times.

Level 1:
Level 1 cottage offers population of 100.

Level 2:
Level 2 cottage offers population of 300.

Level 3:
Level 3 cottage offers population of 600.

Difference:
Difference between Level 1 cottage and Level 2 Cottage

Construction upgrades and mayors affect time, and other variables do too. Please be aware when doing times of this fact, because there won't be a building that builds in any amount of time that includes extra seconds, e.g. 3 minutes 21 seconds.

Links
Jinnai Tsurugi provides a fully calculated resource requirements for all constructions at bbs.evony.com and includes a downloadable text file. (Forwolf 18:28, 21 August 2009 (UTC))