diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 076f24e50b..204268d1e6 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -2734,7 +2734,7 @@ static void BuildTownHouse(Town *t, TileIndex tile, const HouseSpec *hs, HouseID
 		uint32_t construction_random = Random();
 
 		construction_stage = TOWN_HOUSE_COMPLETED;
-		if (_generating_world && Chance16(1, 7)) construction_stage = GB(construction_random, 0, 2);
+		if (_generating_world && !HasFlag(hs->extra_flags, HouseExtraFlags::BUILDING_IS_HISTORICAL) && Chance16(1, 7)) construction_stage = GB(construction_random, 0, 2);
 
 		if (construction_stage == TOWN_HOUSE_COMPLETED) {
 			ChangePopulation(t, hs->population);