diff --git a/src/Spectre.Console.Tests/Unit/Composition/GridTests.cs b/src/Spectre.Console.Tests/Unit/Composition/GridTests.cs
index 4368afd..8adf0fc 100644
--- a/src/Spectre.Console.Tests/Unit/Composition/GridTests.cs
+++ b/src/Spectre.Console.Tests/Unit/Composition/GridTests.cs
@@ -6,6 +6,25 @@ namespace Spectre.Console.Tests.Unit.Composition
 {
     public sealed class GridTests
     {
+        public sealed class TheAddColumnMethod
+        {
+            [Fact]
+            public void Should_Throw_If_Rows_Are_Not_Empty()
+            {
+                // Given
+                var grid = new Grid();
+                grid.AddColumn();
+                grid.AddRow("Hello World!");
+
+                // When
+                var result = Record.Exception(() => grid.AddColumn());
+
+                // Then
+                result.ShouldBeOfType<InvalidOperationException>()
+                    .Message.ShouldBe("Cannot add new columns to grid with existing rows.");
+            }
+        }
+
         public sealed class TheAddRowMethod
         {
             [Fact]
@@ -54,6 +73,30 @@ namespace Spectre.Console.Tests.Unit.Composition
             }
         }
 
+        public sealed class TheAddEmptyRowMethod
+        {
+            [Fact]
+            public void Should_Add_Empty_Row()
+            {
+                // Given
+                var console = new PlainConsole(width: 80);
+                var grid = new Grid();
+                grid.AddColumns(2);
+                grid.AddRow("Foo", "Bar");
+                grid.AddEmptyRow();
+                grid.AddRow("Qux", "Corgi");
+
+                // When
+                console.Render(grid);
+
+                // Then
+                console.Lines.Count.ShouldBe(3);
+                console.Lines[0].ShouldBe("Foo  Bar  ");
+                console.Lines[1].ShouldBe("          ");
+                console.Lines[2].ShouldBe("Qux  Corgi");
+            }
+        }
+
         [Fact]
         public void Should_Render_Grid_Correctly()
         {
diff --git a/src/Spectre.Console.Tests/Unit/Composition/TableTests.cs b/src/Spectre.Console.Tests/Unit/Composition/TableTests.cs
index 2be64cb..02acd26 100644
--- a/src/Spectre.Console.Tests/Unit/Composition/TableTests.cs
+++ b/src/Spectre.Console.Tests/Unit/Composition/TableTests.cs
@@ -21,6 +21,22 @@ namespace Spectre.Console.Tests.Unit.Composition
                 result.ShouldBeOfType<ArgumentNullException>()
                     .ParamName.ShouldBe("column");
             }
+
+            [Fact]
+            public void Should_Throw_If_Rows_Are_Not_Empty()
+            {
+                // Given
+                var grid = new Table();
+                grid.AddColumn("Foo");
+                grid.AddRow("Hello World");
+
+                // When
+                var result = Record.Exception(() => grid.AddColumn("Bar"));
+
+                // Then
+                result.ShouldBeOfType<InvalidOperationException>()
+                    .Message.ShouldBe("Cannot add new columns to table with existing rows.");
+            }
         }
 
         public sealed class TheAddColumnsMethod
@@ -88,6 +104,34 @@ namespace Spectre.Console.Tests.Unit.Composition
             }
         }
 
+        public sealed class TheAddEmptyRowMethod
+        {
+            [Fact]
+            public void Should_Render_Table_Correctly()
+            {
+                // Given
+                var console = new PlainConsole(width: 80);
+                var table = new Table();
+                table.AddColumns("Foo", "Bar", "Baz");
+                table.AddRow("Qux", "Corgi", "Waldo");
+                table.AddEmptyRow();
+                table.AddRow("Grault", "Garply", "Fred");
+
+                // When
+                console.Render(table);
+
+                // Then
+                console.Lines.Count.ShouldBe(7);
+                console.Lines[0].ShouldBe("┌────────┬────────┬───────┐");
+                console.Lines[1].ShouldBe("│ Foo    │ Bar    │ Baz   │");
+                console.Lines[2].ShouldBe("├────────┼────────┼───────┤");
+                console.Lines[3].ShouldBe("│ Qux    │ Corgi  │ Waldo │");
+                console.Lines[4].ShouldBe("│        │        │       │");
+                console.Lines[5].ShouldBe("│ Grault │ Garply │ Fred  │");
+                console.Lines[6].ShouldBe("└────────┴────────┴───────┘");
+            }
+        }
+
         [Fact]
         public void Should_Render_Table_Correctly()
         {
diff --git a/src/Spectre.Console/Composition/Grid.cs b/src/Spectre.Console/Composition/Grid.cs
index e688b25..ff1bfaf 100644
--- a/src/Spectre.Console/Composition/Grid.cs
+++ b/src/Spectre.Console/Composition/Grid.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Spectre.Console.Composition;
+using Spectre.Console.Internal;
 
 namespace Spectre.Console
 {
@@ -56,6 +58,11 @@ namespace Spectre.Console
                 throw new ArgumentNullException(nameof(column));
             }
 
+            if (_table.RowCount > 0)
+            {
+                throw new InvalidOperationException("Cannot add new columns to grid with existing rows.");
+            }
+
             // Only pad the most right cell if we've explicitly set a padding.
             _table.PadRightCell = column.Padding != null;
 
@@ -97,6 +104,16 @@ namespace Spectre.Console
             }
         }
 
+        /// <summary>
+        /// Adds an empty row to the grid.
+        /// </summary>
+        public void AddEmptyRow()
+        {
+            var columns = new string[_table.ColumnCount];
+            Enumerable.Range(0, _table.ColumnCount).ForEach(index => columns[index] = string.Empty);
+            AddRow(columns);
+        }
+
         /// <summary>
         /// Adds a new row to the grid.
         /// </summary>
diff --git a/src/Spectre.Console/Composition/Table.cs b/src/Spectre.Console/Composition/Table.cs
index 45f6b26..71179d3 100644
--- a/src/Spectre.Console/Composition/Table.cs
+++ b/src/Spectre.Console/Composition/Table.cs
@@ -81,7 +81,7 @@ namespace Spectre.Console
                 throw new ArgumentNullException(nameof(column));
             }
 
-            _columns.Add(new TableColumn(column));
+            AddColumn(new TableColumn(column));
         }
 
         /// <summary>
@@ -95,6 +95,11 @@ namespace Spectre.Console
                 throw new ArgumentNullException(nameof(column));
             }
 
+            if (_rows.Count > 0)
+            {
+                throw new InvalidOperationException("Cannot add new columns to table with existing rows.");
+            }
+
             _columns.Add(column);
         }
 
@@ -109,7 +114,10 @@ namespace Spectre.Console
                 throw new ArgumentNullException(nameof(columns));
             }
 
-            _columns.AddRange(columns.Select(column => new TableColumn(column)));
+            foreach (var column in columns)
+            {
+                AddColumn(column);
+            }
         }
 
         /// <summary>
@@ -123,7 +131,20 @@ namespace Spectre.Console
                 throw new ArgumentNullException(nameof(columns));
             }
 
-            _columns.AddRange(columns.Select(column => column));
+            foreach (var column in columns)
+            {
+                AddColumn(column);
+            }
+        }
+
+        /// <summary>
+        /// Adds an empty row to the table.
+        /// </summary>
+        public void AddEmptyRow()
+        {
+            var columns = new string[ColumnCount];
+            Enumerable.Range(0, ColumnCount).ForEach(index => columns[index] = string.Empty);
+            AddRow(columns);
         }
 
         /// <summary>