Buildings: costs, unlocks and where to build

Check the four construction gates

If a building is unavailable, inspect land type, development, technology and copy limit before saving up more materials. Missing the correct technology is only one possible cause.

For example, the Academy requires development level 1 but no technology. Yet not every terrain allows it. The Granary requires Crop Rotation, while Irrigation Works needs the later Irrigation technology and development level 2. A city may have unlocked the building at kingdom level while still failing its local requirements.

Level 2 is the Town threshold used by specialisation. The table shows base costs in the resource order food, materials, gold, Knowledge. Actual prices can change with faction and research effects.

Build for the next constraint

Start with the cheapest investment that actually solves the problem. A food-storage building is not interchangeable with farm production. A military building on a quiet rear holding is not automatically worth more than economic infrastructure at the city supplying your active frontier.

Understand technology unlocks

Crop Rotation unlocks the Granary. Irrigation unlocks Irrigation Works. Markets unlocks Market Square, Trade Routes unlocks Trade House, and Banking unlocks Treasury. Commercial Guilds unlocks Guild Hall.

Stone Construction unlocks Stone Walls. Fortification unlocks Watchtower. Advanced Masonry unlocks Great Keep. Several useful early structures—including Farmland, Lumber Camp, Mine, Workshop Row, Academy, Harbour and Barracks—have no technology prerequisite, although they still have terrain and development rules.

Use the research planner to calculate the full route to a required technology. Do not confuse the last technology’s cost with the total investment required to reach it.

Choose the location before the building

Terrain restrictions create real planning decisions. The Royal Seat allows an Academy but not a Mine. Iron Hills permits a Mine but not an Academy. Harbour is available at Harbour Town; it is not a general-purpose food-and-gold building for every inland city.

Specialisation adds another layer. A Forge Works city supports a materials role, while Seat of Learning supports Knowledge. Choose a location that supports the necessary buildings before paying for the role. See expansion and specialisation for the full preferred-land comparison.

After construction, verify the result

Reopen the city and check the quantity you intended to improve: food output, population room, Knowledge income or recruitment availability. If that quantity remains constrained, inspect its other conditions before repeating the purchase elsewhere.

For a Barracks, check the unit-specific technology too: cavalry needs Standing Army, and siege units accept Siege Engineering or Royal Siegecraft. For a food investment, compare the new production with the burden from recent population growth or mustering. The food troubleshooting guide helps separate those effects.