BHoM · pawelbaran · Oct 17, 2025 · Oct 9, 2025 · Oct 9, 2025 · Oct 9, 2025
diff --git a/Revit_Core_Adapter/CRUD/Create.cs b/Revit_Core_Adapter/CRUD/Create.cs
@@ -42,7 +42,7 @@ public List<IBHoMObject> Create(IEnumerable<IBHoMObject> bHoMObjects, RevitPushC
             Document document = this.Document;
             RevitSettings settings = this.RevitSettings.DefaultIfNull();
 
-            Dictionary<Guid, List<int>> refObjects = new Dictionary<Guid, List<int>>();
+            Dictionary<Guid, List<long>> refObjects = new Dictionary<Guid, List<long>>();
             List<IBHoMObject> created = new List<IBHoMObject>();
             foreach (IBHoMObject obj in bHoMObjects)
             {
@@ -55,7 +55,7 @@ public List<IBHoMObject> Create(IEnumerable<IBHoMObject> bHoMObjects, RevitPushC
 
         /***************************************************/
 
-        public static Element Create(IBHoMObject bHoMObject, Document document, RevitSettings settings, Dictionary<Guid, List<int>> refObjects)
+        public static Element Create(IBHoMObject bHoMObject, Document document, RevitSettings settings, Dictionary<Guid, List<long>> refObjects)
         {
             if (bHoMObject == null)
             {
@@ -67,12 +67,12 @@ public static Element Create(IBHoMObject bHoMObject, Document document, RevitSet
             {
                 Element element = bHoMObject.IToRevit(document, settings, refObjects);
                 bHoMObject.SetIdentifiers(element);
-                
+
                 //Assign Tags
                 string tagsParameterName = null;
                 if (settings != null)
                     tagsParameterName = settings.MappingSettings?.TagsParameter;
-                
+
                 if (!string.IsNullOrEmpty(tagsParameterName))
                     element.SetTags(bHoMObject, tagsParameterName);
 

diff --git a/Revit_Core_Adapter/CRUD/Delete.cs b/Revit_Core_Adapter/CRUD/Delete.cs
@@ -106,7 +106,7 @@ public static bool Delete(IBHoMObject bHoMObject, Document document)
                 }
             }
 
-            if (elementId == null || elementId.IntegerValue < 0)
+            if (elementId == null || elementId.Value() < 0)
                 return false;
 
             return Delete(elementId, document, false).Count() != 0;

diff --git a/Revit_Core_Adapter/CRUD/Read.cs b/Revit_Core_Adapter/CRUD/Read.cs
@@ -105,7 +105,7 @@ protected override IEnumerable<IBHoMObject> Read(IRequest request, ActionConfig
             {
                 Document doc;
                 Transform transform = Transform.Identity;
-                if (requestByLink.Key.IntegerValue == -1)
+                if (requestByLink.Key.Value() == -1)
                     doc = this.Document;
                 else
                 {

diff --git a/Revit_Core_Adapter/ExecuteCommands/Isolate.cs b/Revit_Core_Adapter/ExecuteCommands/Isolate.cs
@@ -56,7 +56,7 @@ public Output<List<object>, bool> Isolate(Isolate command)
             }
 
             uidoc.Selection.SetElementIds(elementIds);
-            output.Item1 = elementIds.Select(x => x.IntegerValue).Cast<object>().ToList();
+            output.Item1 = elementIds.Select(x => x.Value()).Cast<object>().ToList();
             output.Item2 = true;
 
             return output;

diff --git a/Revit_Core_Adapter/ExecuteCommands/Select.cs b/Revit_Core_Adapter/ExecuteCommands/Select.cs
@@ -68,7 +68,7 @@ public Output<List<object>, bool> Select(Select command)
 
             uidoc.Selection.SetElementIds(elementIds);
 
-            output.Item1 = elementIds.Select(x => x.IntegerValue).Cast<object>().ToList();
+            output.Item1 = elementIds.Select(x => x.Value()).Cast<object>().ToList();
             output.Item2 = true;
             return output;
         }

diff --git a/...re_Adapter/Listener/Files/BHoM_2021.Addin → ...re_Adapter/Listener/Files/BHoM_2026.Addin b/...re_Adapter/Listener/Files/BHoM_2021.Addin → ...re_Adapter/Listener/Files/BHoM_2026.Addin
@@ -2,7 +2,7 @@
 <RevitAddIns>
   <AddIn Type="Application">
     <Name>BHoM Revit</Name>
-    <Assembly>C:\ProgramData\BHoM\Assemblies\Revit_Core_Adapter_2021.dll</Assembly>
+    <Assembly>C:\ProgramData\BHoM\Assemblies\Revit_Core_Adapter_2026.dll</Assembly>
     <FullClassName>BH.Revit.Adapter.Core.RevitListener</FullClassName> |
     <AddInId>05D16C68-EA24-4E38-A9D9-6029E2F8C760</AddInId>
     <Text>Buildings and Habitats object Model (BHoM) Revit Addin</Text>

diff --git a/Revit_Core_Adapter/Revit_Core_Adapter.csproj b/Revit_Core_Adapter/Revit_Core_Adapter.csproj
@@ -16,18 +16,13 @@
 		<GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
 		<AppendTargetFrameworkToOutputpath>false</AppendTargetFrameworkToOutputpath>
 		<ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
-		<Configurations>Debug;Release;Debug2021;Release2021;Debug2022;Release2022;Debug2023;Release2023;Debug2024;Release2024;Debug2025;Release2025</Configurations>
+		<Configurations>Debug;Release;Debug2022;Release2022;Debug2023;Release2023;Debug2024;Release2024;Debug2025;Release2025;Debug2026;Release2026</Configurations>
 	</PropertyGroup>
 
 	<PropertyGroup Condition="'$(Configuration)'=='Debug' Or '$(Configuration)'=='Release'">
-		<RevitVersion>2021</RevitVersion>
-		<TargetFramework>net48</TargetFramework>
-		<DefineConstants>REVIT2021</DefineConstants>
-	</PropertyGroup>
-	<PropertyGroup Condition="$(Configuration.Contains('2021'))">
-		<RevitVersion>2021</RevitVersion>
+		<RevitVersion>2022</RevitVersion>
 		<TargetFramework>net48</TargetFramework>
-		<DefineConstants>REVIT2021</DefineConstants>
+		<DefineConstants>REVIT2022</DefineConstants>
 	</PropertyGroup>
 	<PropertyGroup Condition="$(Configuration.Contains('2022'))">
 		<RevitVersion>2022</RevitVersion>
@@ -49,6 +44,11 @@
 		<TargetFramework>net8.0-windows</TargetFramework>
 		<DefineConstants>REVIT2025</DefineConstants>
 	</PropertyGroup>
+	<PropertyGroup Condition="$(Configuration.Contains('2026'))">
+		<RevitVersion>2026</RevitVersion>
+		<TargetFramework>net8.0-windows</TargetFramework>
+		<DefineConstants>REVIT2026</DefineConstants>
+	</PropertyGroup>
 
 	<PropertyGroup>
 		<AssemblyName>Revit_Core_Adapter_$(RevitVersion)</AssemblyName>

diff --git a/Revit_Core_Engine/Compute/CompareValues.cs b/Revit_Core_Engine/Compute/CompareValues.cs
@@ -60,7 +60,7 @@ public static partial class Compute
                     return null;
 
                 bool invert = comparisonType == ValueComparisonType.NotEqualTo;
-                bool equal = id.IntegerValue == value.AsElementId()?.IntegerValue;
+                bool equal = id.Value() == value.AsElementId()?.Value();
                 return equal != invert;
             }
             else if (referenceValue is Element e)
@@ -69,7 +69,7 @@ public static partial class Compute
                     return null;
 
                 bool invert = comparisonType == ValueComparisonType.NotEqualTo;
-                bool equal = e.Id.IntegerValue == value.AsElementId()?.IntegerValue && e.Document.PathName == value.Element?.Document.PathName;
+                bool equal = e.Id.Value() == value.AsElementId()?.Value() && e.Document.PathName == value.Element?.Document.PathName;
                 return equal != invert;
             }
             else

diff --git a/Revit_Core_Engine/Compute/Errors.cs b/Revit_Core_Engine/Compute/Errors.cs
@@ -54,35 +54,35 @@ internal static void ConvertBeforePushError(this IBHoMObject iBHoMObject, Type t
 
         internal static void NoPanelLocationError(this Element element)
         {
-            BH.Engine.Base.Compute.RecordError(string.Format("Location of the Revit {0} could not be converted to BHoM, and therefore the output BHoM object will have empty location and no openings. Please note that BHoM panel conversion supports only planar faces. Revit ElementId: {1}", element.GetType().Name, element.Id.IntegerValue));
+            BH.Engine.Base.Compute.RecordError(string.Format("Location of the Revit {0} could not be converted to BHoM, and therefore the output BHoM object will have empty location and no openings. Please note that BHoM panel conversion supports only planar faces. Revit ElementId: {1}", element.GetType().Name, element.Id.Value()));
         }
 
         /***************************************************/
 
         internal static void InvalidFamilyPlacementTypeError(this IBHoMObject bHoMObject, ElementType elementType)
         {
-            BH.Engine.Base.Compute.RecordError($"BHoM Object location does not match with the required placement type of Revit family. BHoM Guid: {bHoMObject.BHoM_Guid}, Revit ElementId: {elementType.Id.IntegerValue}");
+            BH.Engine.Base.Compute.RecordError($"BHoM Object location does not match with the required placement type of Revit family. BHoM Guid: {bHoMObject.BHoM_Guid}, Revit ElementId: {elementType.Id.Value()}");
         }
 
         /***************************************************/
 
         internal static void FamilyPlacementTypeDraftingError(this FamilySymbol familySymbol)
         {
-            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} indicates that the family is a drafting family. Please use DraftingInstance instead of a ModelInstance in order to push it. Revit ElementId: {familySymbol.Id.IntegerValue}");
+            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} indicates that the family is a drafting family. Please use DraftingInstance instead of a ModelInstance in order to push it. Revit ElementId: {familySymbol.Id.Value()}");
         }
 
         /***************************************************/
 
         internal static void FamilyPlacementTypeModelError(this FamilySymbol familySymbol)
         {
-            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} indicates that the family is a model family. Please use ModelInstance instead of a DraftingInstance in order to push it. Revit ElementId: {familySymbol.Id.IntegerValue}");
+            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} indicates that the family is a model family. Please use ModelInstance instead of a DraftingInstance in order to push it. Revit ElementId: {familySymbol.Id.Value()}");
         }
 
         /***************************************************/
 
         internal static void LinearOnlyError(this FamilySymbol familySymbol)
         {
-            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} accepts only linear curves. Please use ModelInstance instead of a DraftingInstance in order to push it. Revit ElementId: {familySymbol.Id.IntegerValue}");
+            BH.Engine.Base.Compute.RecordError($"Revit family placement type named {familySymbol.Family.FamilyPlacementType} accepts only linear curves. Please use ModelInstance instead of a DraftingInstance in order to push it. Revit ElementId: {familySymbol.Id.Value()}");
         }
 
         /***************************************************/
@@ -96,7 +96,7 @@ internal static void InvalidRegionSurfaceError(this DraftingInstance draftingIns
 
         internal static void InvalidTwoLevelLocationError(this FamilySymbol familySymbol)
         {
-            BH.Engine.Base.Compute.RecordError($"Location line of the two-level based element is upside-down, which is not allowed for given family placement type. ElementId: {familySymbol.Id.IntegerValue}");
+            BH.Engine.Base.Compute.RecordError($"Location line of the two-level based element is upside-down, which is not allowed for given family placement type. ElementId: {familySymbol.Id.Value()}");
         }
 
         /***************************************************/

diff --git a/Revit_Core_Engine/Compute/Isolate.cs b/Revit_Core_Engine/Compute/Isolate.cs
@@ -97,11 +97,11 @@ private static View GetTargetView(Document doc, View currentView, List<ElementId
             // Check invalid element IDs
             List<ElementId> invalidedIds = elementIds.Where(id => doc.GetElement(id) == null).ToList();
             if (invalidedIds.Count > 0)
-                BH.Engine.Base.Compute.RecordWarning($"Elements under some element IDs do not exist in the current document: {string.Join(", ", invalidedIds.Select(id => id.IntegerValue))}");
+                BH.Engine.Base.Compute.RecordWarning($"Elements under some element IDs do not exist in the current document: {string.Join(", ", invalidedIds.Select(id => id.Value()))}");
 
             // Check if selected viewspecific elements are at same view, then check host elements
             List<ElementId> viewSpecific = elementIds.Where(id => doc.GetElement(id)?.ViewSpecific == true).ToList();
-            HashSet<int> nonViewSpecificSet = elementIds.Except(viewSpecific).Select(id => id.IntegerValue).ToHashSet();
+            HashSet<long> nonViewSpecificSet = elementIds.Except(viewSpecific).Select(id => id.Value()).ToHashSet();
 
             if (viewSpecific.Count > 0)
             {
@@ -116,10 +116,10 @@ private static View GetTargetView(Document doc, View currentView, List<ElementId
                 }
 
                 // Warn if hosts of view-specific items are not included in selection
-                List<int> hostIds = viewSpecific.GetHostElementIds(doc).Select(x => x.IntegerValue).ToList();
+                List<long> hostIds = viewSpecific.GetHostElementIds(doc).Select(x => x.Value()).ToList();
                 if (hostIds.Count > 0)
                 {
-                    List<int> missingHosts = hostIds.Where(h => !nonViewSpecificSet.Contains(h)).Distinct().ToList();
+                    List<long> missingHosts = hostIds.Where(h => !nonViewSpecificSet.Contains(h)).Distinct().ToList();
                     if (missingHosts.Count > 0)
                     {
                         BH.Engine.Base.Compute.RecordWarning($"Some host elements are not selected: {string.Join(", ", missingHosts)}. " +
@@ -218,13 +218,7 @@ private static ICollection<ElementId> GetHostElementIds(this IEnumerable<Element
             {
                 Element el = doc.GetElement(id);
                 if (el is IndependentTag tag)
-                {
-#if (REVIT2021)
-                    hostIds.Add(tag.GetTaggedLocalElement().Id);//Check for local host elements only
-#else
                     hostIds.AddRange(tag.GetTaggedLocalElementIds().ToList());//Check for local host elements only
-#endif
-                }
 
                 if (el is FamilyInstance fi && fi.Host != null)
                 {

diff --git a/Revit_Core_Engine/Compute/Notes.cs b/Revit_Core_Engine/Compute/Notes.cs
@@ -38,7 +38,7 @@ internal static void MaterialNotInLibraryNote(this Material material)
             string message = "Material could not be found in BHoM Library.";
 
             if (material != null)
-                message = string.Format("{0} Material Id: {1}", message, material.Id.IntegerValue);
+                message = string.Format("{0} Material Id: {1}", message, material.Id.Value());
 
             BH.Engine.Base.Compute.RecordNote(message);
         }

diff --git a/Revit_Core_Engine/Compute/PrepareForLinkDimensioning.cs b/Revit_Core_Engine/Compute/PrepareForLinkDimensioning.cs
@@ -38,7 +38,7 @@ public static partial class Compute
         [Output("reference", "Linked element reference prepared for dimensioning in the host document.")]
         public static Reference PrepareForLinkDimensioning(this Reference reference, Document hostDocument)
         {
-            if (reference.LinkedElementId.IntegerValue == -1)
+            if (reference.LinkedElementId.Value() == -1)
                 return null;
 
             string[] ss = reference.ConvertToStableRepresentation(hostDocument).Split(':');

diff --git a/Revit_Core_Engine/Compute/SplitRequestTreeByLinks.cs b/Revit_Core_Engine/Compute/SplitRequestTreeByLinks.cs
@@ -23,10 +23,8 @@
 using Autodesk.Revit.DB;
 using BH.Engine.Data;
 using BH.oM.Adapters.Revit.Requests;
-using BH.oM.Data.Requests;
 using BH.oM.Base.Attributes;
-using BH.Revit.Engine.Core;
-using System;
+using BH.oM.Data.Requests;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
@@ -77,7 +75,7 @@ private static bool TryOrganizeByLink(this IRequest request, Document document,
             List<IRequest> linkRequests = request.AllRequestsOfType(typeof(FilterByLink));
             if (linkRequests.Count == 0)
             {
-                requestsByLinks.AddRequestByLink(request, new ElementId(-1));
+                requestsByLinks.AddRequestByLink(request, ElementId.InvalidElementId);
                 return true;
             }
             else if (linkRequests.Count == 1)

diff --git a/Revit_Core_Engine/Compute/TryGetValueFromSource.cs b/Revit_Core_Engine/Compute/TryGetValueFromSource.cs
@@ -70,7 +70,7 @@ public static Output<bool, object> TryGetValueFromSource(this Element element, P
             {
                 param = element.Document.GetElement(element.GetTypeId())?.LookupParameter(valueSource.ParameterName);
                 if (param != null)
-                    BH.Engine.Base.Compute.RecordNote($"Parameter {valueSource.ParameterName} was not found in the instance of element {element.Id.IntegerValue}, but was found in the type.");
+                    BH.Engine.Base.Compute.RecordNote($"Parameter {valueSource.ParameterName} was not found in the instance of element {element.Id.Value()}, but was found in the type.");
             }
 
             if (param == null)