diff --git a/YAFC/Workspace/ProductionTable/ProductionTableView.cs b/YAFC/Workspace/ProductionTable/ProductionTableView.cs
index c0bba294..f88ca771 100644
--- a/YAFC/Workspace/ProductionTable/ProductionTableView.cs
+++ b/YAFC/Workspace/ProductionTable/ProductionTableView.cs
@@ -255,16 +255,28 @@ public override void BuildElement(ImGui gui, RecipeRow recipe)
                 if (recipe.isOverviewMode)
                     return;
                 bool clicked;
-                if (recipe.fixedBuildings > 0)
+                using (var group = gui.EnterGroup(default, RectAllocator.Stretch, spacing:0f))
                 {
-                    var evt = gui.BuildFactorioObjectWithEditableAmount(recipe.entity, recipe.fixedBuildings, UnitOfMeasure.None, out var newAmount);
-                    if (evt == GoodsWithAmountEvent.TextEditing)
-                        recipe.RecordUndo().fixedBuildings = newAmount;
-                    clicked = evt == GoodsWithAmountEvent.ButtonClick;
+                    group.SetWidth(3f);
+                    if (recipe.fixedBuildings > 0)
+                    {
+                        var evt = gui.BuildFactorioObjectWithEditableAmount(recipe.entity, recipe.fixedBuildings, UnitOfMeasure.None, out var newAmount);
+                        if (evt == GoodsWithAmountEvent.TextEditing)
+                            recipe.RecordUndo().fixedBuildings = newAmount;
+                        clicked = evt == GoodsWithAmountEvent.ButtonClick;
+                    }
+                    else
+                        clicked = gui.BuildFactorioObjectWithAmount(recipe.entity, recipe.buildingCount, UnitOfMeasure.None) && recipe.recipe.crafters.Length > 0;
+
+                    if (recipe.builtBuildings != null)
+                    {
+                        if (gui.BuildTextInput(DataUtils.FormatAmount(Convert.ToSingle(recipe.builtBuildings), UnitOfMeasure.None), out var newText, null, Icon.None, true, default, RectAlignment.Middle, SchemeColor.Grey))
+                        {
+                            if (DataUtils.TryParseAmount(newText, out var newAmount, UnitOfMeasure.None))
+                                recipe.RecordUndo().builtBuildings = Convert.ToInt32(newAmount);
+                        }
+                    }
                 }
-                else
-                    clicked = gui.BuildFactorioObjectWithAmount(recipe.entity, recipe.buildingCount, UnitOfMeasure.None) && recipe.recipe.crafters.Length > 0; 
-            
             
                 if (clicked)
                 {
@@ -326,6 +338,17 @@ private void ShowEntityDropPown(ImGui imgui, RecipeRow recipe)
                             recipe.RecordUndo().fixedBuildings = recipe.buildingCount <= 0f ? 1f : recipe.buildingCount;
                     }
                     
+                    if (recipe.builtBuildings != null)
+                    {
+                        if (gui.BuildButton("Clear built building count") && gui.CloseDropdown())
+                            recipe.RecordUndo().builtBuildings = null;
+                    }
+                    else
+                    {
+                        if (gui.BuildButton("Set built building count") && gui.CloseDropdown())
+                            recipe.RecordUndo().builtBuildings = Math.Max(0, Convert.ToInt32(Math.Ceiling(recipe.buildingCount)));
+                    }
+
                     if (recipe.entity != null && gui.BuildButton("Create single building blueprint") && gui.CloseDropdown())
                     {
                         var entity = new BlueprintEntity {index = 1, name = recipe.entity.name};
@@ -907,7 +930,7 @@ private void BuildShoppngList(RecipeRow recipeRoot)
                 if (recipe.entity != null)
                 {
                     shopList.TryGetValue(recipe.entity, out var prev);
-                    var count = MathUtils.Ceil(recipe.buildingCount);
+                    var count = MathUtils.Ceil(recipe.builtBuildings ?? recipe.buildingCount);
                     shopList[recipe.entity] = prev + count;
                     if (recipe.parameters.modules.modules != null)
                     {
@@ -1061,7 +1084,8 @@ protected override void BuildPageTooltip(ImGui gui, ProductionTable contents)
             {WarningFlags.TemperatureForIngredientNotMatch, "This recipe does care about ingridient temperature, and the temperature range does not match"},
             {WarningFlags.ReactorsNeighboursFromPrefs, "Assumes reactor formation from preferences"},
             {WarningFlags.AssumesNauvisSolarRatio, "Energy production values assumes Nauvis solar ration (70% power output). Don't forget accumulators."},
-            {WarningFlags.RecipeTickLimit, "Production is limited to 60 recipes per second (1/tick). This interacts weirdly with productivity bonus - actual productivity may be imprecise and may depend on your setup - test your setup before commiting to it."}
+            {WarningFlags.RecipeTickLimit, "Production is limited to 60 recipes per second (1/tick). This interacts weirdly with productivity bonus - actual productivity may be imprecise and may depend on your setup - test your setup before commiting to it."},
+            {WarningFlags.ExceedsBuiltCount, "This recipe requires more buildings than are currently built."}
         };
         
         private void BuildRecipePad(ImGui gui, RecipeRow row)
diff --git a/YAFCmodel/Model/ProductionTable.cs b/YAFCmodel/Model/ProductionTable.cs
index 63b16fc7..4b8b5b52 100644
--- a/YAFCmodel/Model/ProductionTable.cs
+++ b/YAFCmodel/Model/ProductionTable.cs
@@ -460,16 +460,38 @@ public override async Task<string> Solve(ProjectPage page)
                 }
 
             }
-                
+
             for (var i = 0; i < allRecipes.Count; i++)
             {
                 var recipe = allRecipes[i];
                 recipe.recipesPerSecond = vars[i].SolutionValue();
             }
 
+            var builtCountExceeded = CheckBuiltCountExceeded();
+
             CalculateFlow(null);
             solver.Dispose();
-            return null;
+            return builtCountExceeded ? "This model requires more buildings than are currently built" : null;
+        }
+
+        private bool CheckBuiltCountExceeded() {
+            var builtCountExceeded = false;
+            for (var i = 0; i < recipes.Count; i++)
+            {
+                var recipe = recipes[i];
+                if (recipe.buildingCount > recipe.builtBuildings)
+                {
+                    recipe.parameters.warningFlags |= WarningFlags.ExceedsBuiltCount;
+                    builtCountExceeded = true;
+                } else if (recipe.subgroup != null) {
+                    if (recipe.subgroup.CheckBuiltCountExceeded()) {
+                        recipe.parameters.warningFlags |= WarningFlags.ExceedsBuiltCount;
+                        builtCountExceeded = true;
+                    }
+                }
+            }
+
+            return builtCountExceeded;
         }
 
         private void FindAllRecipeLinks(RecipeRow recipe, List<ProductionLink> sources, List<ProductionLink> targets)
diff --git a/YAFCmodel/Model/ProductionTableContent.cs b/YAFCmodel/Model/ProductionTableContent.cs
index 04419ad4..2fa18325 100644
--- a/YAFCmodel/Model/ProductionTableContent.cs
+++ b/YAFCmodel/Model/ProductionTableContent.cs
@@ -178,6 +178,7 @@ public class RecipeRow : ModelObject<ProductionTable>, IModuleFiller, IGroupedEl
         public Goods fuel { get; set; }
         public RecipeLinks links { get; internal set; }
         public float fixedBuildings { get; set; }
+        public int? builtBuildings { get; set; }
         public bool enabled { get; set; } = true;
         public bool hierarchyEnabled { get; internal set; }
         public int tag { get; set; }
diff --git a/YAFCmodel/Model/RecipeParameters.cs b/YAFCmodel/Model/RecipeParameters.cs
index dd4d4005..8764b9e9 100644
--- a/YAFCmodel/Model/RecipeParameters.cs
+++ b/YAFCmodel/Model/RecipeParameters.cs
@@ -21,6 +21,7 @@ public enum WarningFlags
         // Solution errors
         DeadlockCandidate = 1 << 16,
         OverproductionRequired = 1 << 17,
+        ExceedsBuiltCount = 1 << 18,
         
         // Not implemented warnings
         TemperatureForIngredientNotMatch = 1 << 24,