diff --git a/sootup.core/src/main/java/sootup/core/frontend/OverridingClassSource.java b/sootup.core/src/main/java/sootup/core/frontend/OverridingClassSource.java
index 4d320e90522..c17164f7410 100644
--- a/sootup.core/src/main/java/sootup/core/frontend/OverridingClassSource.java
+++ b/sootup.core/src/main/java/sootup/core/frontend/OverridingClassSource.java
@@ -334,4 +334,172 @@ public OverridingClassSource withPosition(@Nullable Position position) {
         position,
         delegate);
   }
+
+  /**
+   * Creates a builder for {@link OverridingClassSource}.
+   *
+   * @return a {@link OverridingClassSourceBuilder}
+   */
+  @Nonnull
+  public static MethodsStep builder() {
+    return new OverridingClassSourceBuilder();
+  }
+
+  public interface MethodsStep {
+    @Nonnull
+    FieldsStep withMethods(@Nonnull Collection<SootMethod> overriddenSootMethods);
+  }
+
+  public interface FieldsStep {
+    @Nonnull
+    ModifiersStep withFields(@Nonnull Collection<SootField> overriddenSootFields);
+  }
+
+  public interface ModifiersStep {
+    @Nonnull
+    InterfacesStep withModifiers(@Nonnull Set<ClassModifier> overriddenModifiers);
+  }
+
+  public interface InterfacesStep {
+    @Nonnull
+    SuperclassStep withInterfaces(@Nonnull Set<ClassType> overriddenInterfaces);
+  }
+
+  public interface SuperclassStep {
+    @Nonnull
+    OuterClassStep withSuperclass(@Nonnull Optional<ClassType> overriddenSuperclass);
+  }
+
+  public interface OuterClassStep {
+    @Nonnull
+    PositionStep withOuterClass(@Nonnull Optional<ClassType> overriddenOuterClass);
+  }
+
+  public interface PositionStep {
+    @Nonnull
+    Build withPosition(@Nullable Position position);
+  }
+
+  public interface Build {
+    @Nonnull
+    OverridingClassSource build();
+  }
+
+  /** Defines a {@link OverridingClassSource} builder. */
+  public static class OverridingClassSourceBuilder
+      implements MethodsStep,
+          FieldsStep,
+          ModifiersStep,
+          InterfacesStep,
+          SuperclassStep,
+          OuterClassStep,
+          PositionStep,
+          Build {
+    @Nullable private Collection<SootMethod> overriddenSootMethods;
+    @Nullable private Collection<SootField> overriddenSootFields;
+    @Nullable private Set<ClassModifier> overriddenModifiers;
+    @Nullable private Set<ClassType> overriddenInterfaces;
+    @Nullable private Optional<ClassType> overriddenSuperclass;
+    @Nullable private Optional<ClassType> overriddenOuterClass;
+    @Nullable private Position position;
+
+    @Nullable
+    public Collection<SootMethod> getMethods() {
+      return overriddenSootMethods;
+    }
+
+    @Nullable
+    public Collection<SootField> getFields() {
+      return overriddenSootFields;
+    }
+
+    @Nullable
+    public Set<ClassModifier> getModifiers() {
+      return overriddenModifiers;
+    }
+
+    @Nullable
+    public Set<ClassType> getInterfaces() {
+      return overriddenInterfaces;
+    }
+
+    @Nullable
+    public Optional<ClassType> getSuperclass() {
+      return overriddenSuperclass;
+    }
+
+    @Nullable
+    public Optional<ClassType> getOuterClass() {
+      return overriddenOuterClass;
+    }
+
+    @Nullable
+    public Position getPosition() {
+      return position;
+    }
+
+    @Override
+    @Nonnull
+    public FieldsStep withMethods(@Nonnull Collection<SootMethod> overriddenSootMethods) {
+      this.overriddenSootMethods = overriddenSootMethods;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public ModifiersStep withFields(@Nonnull Collection<SootField> overriddenSootFields) {
+      this.overriddenSootFields = overriddenSootFields;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public InterfacesStep withModifiers(@Nonnull Set<ClassModifier> overriddenModifiers) {
+      this.overriddenModifiers = overriddenModifiers;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public SuperclassStep withInterfaces(@Nonnull Set<ClassType> overriddenInterfaces) {
+      this.overriddenInterfaces = overriddenInterfaces;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public OuterClassStep withSuperclass(@Nonnull Optional<ClassType> overriddenSuperclass) {
+      this.overriddenSuperclass = overriddenSuperclass;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public PositionStep withOuterClass(@Nonnull Optional<ClassType> overriddenOuterClass) {
+      this.overriddenOuterClass = overriddenOuterClass;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public Build withPosition(@Nullable Position position) {
+      this.position = position;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public OverridingClassSource build() {
+      return new OverridingClassSource(
+        getMethods(),
+        getFields(),
+        getModifiers(),
+        getInterfaces(),
+        getSuperclass(),
+        getOuterClass(),
+        getPosition(),
+        null
+      );
+    }
+  }
 }
diff --git a/sootup.core/src/main/java/sootup/core/model/SootClass.java b/sootup.core/src/main/java/sootup/core/model/SootClass.java
index acf1cfc2646..e6df2225455 100644
--- a/sootup.core/src/main/java/sootup/core/model/SootClass.java
+++ b/sootup.core/src/main/java/sootup/core/model/SootClass.java
@@ -29,6 +29,8 @@
 import java.util.Set;
 import java.util.function.Supplier;
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 import sootup.core.frontend.ResolveException;
 import sootup.core.frontend.SootClassSource;
 import sootup.core.types.ClassType;
@@ -291,4 +293,68 @@ public SootClass withClassSource(@Nonnull SootClassSource classSource) {
   public SootClass withSourceType(@Nonnull SourceType sourceType) {
     return new SootClass(classSource, sourceType);
   }
+
+  /**
+   * Creates a builder for {@link SootClass}.
+   * @return a {@link SootClassBuilder}
+   */
+  @Nonnull
+  public static ClassSourceStep builder() {
+    return new SootClassBuilder();
+  }
+
+  public interface ClassSourceStep {
+    @Nonnull
+    SourceTypeStep withClassSource(@Nonnull SootClassSource classSource);
+  }
+
+  public interface SourceTypeStep {
+    @Nonnull
+    Build withSourceType(@Nonnull SourceType sourceType);
+  }
+
+  public interface Build {
+    @Nonnull
+    SootClass build();
+  }
+
+  /**
+   * Defines a {@link SootClass} builder.
+   */
+  public static class SootClassBuilder implements ClassSourceStep, SourceTypeStep, Build {
+    @Nullable
+    private SootClassSource classSource;
+    @Nullable
+    private SourceType sourceType;
+
+    @Nullable
+    public SootClassSource getClassSource() {
+      return classSource;
+    }
+
+    @Nullable
+    public SourceType getSourceType() {
+      return sourceType;
+    }
+
+    @Override
+    @Nonnull
+    public SourceTypeStep withClassSource(@Nonnull SootClassSource classSource) {
+      this.classSource = classSource;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public Build withSourceType(@Nonnull SourceType sourceType) {
+      this.sourceType = sourceType;
+      return this;
+    }
+
+    @Override
+    @Nonnull
+    public SootClass build() {
+      return new SootClass(getClassSource(), getSourceType());
+    }
+  }
 }