Buildings (Improvements and Wonders)

The BLDG tab allows you to add buildings. Many of the properties on this tab have descriptions when you hover over them.

Flags that Stack

Some of the toggleable flags will stack if multiple buildings in a city have that flag checked; others will not. CyberChrist composed a list of the ones that stack here, and it has been reproduced below (with labels adjusted to match this editor's labels) for reference:

Cumulative (Stacks)

• Doubles Sacrifice
• +50% Research Output
• +50% Luxury Output
• +50% Tax Output
• Propaganda Resistance
• Reduces War Weariness
• +1 Food in Water
• Increased Water Trade
• More shields in water
• +1 trade per tile
• +100% Research Output
• 5% treasury interest (still capped at 50 GPT total)
• Reduces Corruption
• Reduces War Weariness in All Cities
• Doubles City Defences (only applies to bombardment defence)

Non-Cumulative (Does Not Stack)

• Defence bonus
• No population pollution
• Less building pollution
• More lux trade
• Doubles combat vs Barbarians
• +1 sea moves
• +2 sea moves (note the +1 and +2 can be combined for +3, but the flags don't stack)
• Half cost upgrades
• Cities gain +2 population instead of +1
• More leaders
• Larger armies
• Can heal in enemy territory

Filters

As of version 1.28, the BLDG tab supports filtering the list of buildings. For information on filtering in general, see this page; for information on the filters available for buildings, see this page.