There is no limit to the number of buildings you can construct at any time, but it does take time for construction to be completed.
Most new buildings or upgrades takes one year to complete.
You must build one of the buildings with a purple dot as shown in the buildtree (watchtower, subtemple, teahouse, market, or mansion), before you can build other buildings or upgrades. Excluded to this rule are fields, plantations and pits, as shown in the buildtree with a green dot.
You must have constructed the lower level upgrades or building before you can proceed with construction of higher level buildings or upgrades along the same line or lines as shown in the buildtree. Some scientific advances must be researched before you are allowed to construct higher level buildings.
The following table shows the construction costs of all the buildings.
|watchtower||500 koku||2 seasons|
|keep||500 koku||4 seasons|
|castle||1000 koku||8 seasons|
|fortress||2000 koku||8 seasons|
|teahouse||500 koku||4 seasons|
|inn||500 koku||4 seasons|
|subtemple||500 koku||4 seasons|
|temple||1000 koku||8 seasons|
|temple complex||2000 koku||8 seasons|
|ricepaddy||500 koku||2 seasons|
|ricebroker||500 koku||4 seasons|
|brewery||500 koku||4 seasons|
|market||500 koku||4 seasons|
|guild||1000 koku||4 seasons|
|clay pit||500 koku||4 seasons|
|potterer||500 koku||4 seasons|
|sumac plantation||500 koku||4 seasons|
|lacquerer||500 koku||4 seasons|
|mulberry field||500 koku||4 seasons|
|weavery||500 koku||4 seasons|
|tea field||500 koku||4 seasons|
|farmstead||500 koku||4 seasons|
|mansion||500 koku||4 seasons|
|stables||500 koku||4 seasons|
|palace||2000 koku||8 seasons|
|fletcher||500 koku||4 seasons|
|poleturner||500 koku||4 seasons|
|chainmail armorer||500 koku||4 seasons|
|scale armorer||500 koku||4 seasons|
|lamellar armorer||500 koku||4 seasons|
|smelter||500 koku||4 seasons|
|swordsmithy||500 koku||4 seasons|
|gunmakers guild||500 koku||4 seasons|
|port||500 koku||4 seasons|
|fishing wharf||500 koku||4 seasons|
A ricepaddy can only be constructed on plains, forests and hills, provided there is no tea, ceramics, lacquerware, or silk located in that district.
Other commercial buildings such as a clay pit, sumac plantation, mulberry field, or tea field can only be constructed, where there respectively is ceramics, lacquerware, silk, or tea located in that district.
You cannot construct towns on mountainous districts. An exception to this rule is a market and guild, where there is iron sand, copper, silver or gold to be found. Another exception to this rule, is that you are allowed to construct a temple on a mountainous district, if there is a famous shrine or famous temple located in that district.
Ports and fishing wharfs can only be constructed on beaches.