Flutter doesn't provides out-of-the-box spacing attributes for Column and Row widgets (see https://github.com/flutter/flutter/issues/55378). This utility file helps to add horizontal and vertical padding on Columns and Rows

columns_rows_spacing.dart

import 'package:flutter/widgets.dart';

List<Widget> addHorizontalSpacing(double spacing, List<Widget> children) {
  assert(spacing >= 0.0);

  if (children.length <= 1) {
    return children;
  }

  return <Widget>[
    children[0],
    ...children.sublist(1).map(
          (item) =>
              Padding(padding: EdgeInsets.only(left: spacing), child: item),
        )
  ];
}

List<Widget> addVerticalSpacing(double spacing, List<Widget> children) {
  assert(spacing >= 0.0);

  if (children.length <= 1) {
    return children;
  }

  return <Widget>[
    children[0],
    ...children.sublist(1).map(
          (item) =>
              Padding(padding: EdgeInsets.only(top: spacing), child: item),
        )
  ];
}

example.dart

import 'columns_rows_spacing.dart';


Widget build(BuildContext context) {
  return Column(
    children: [
      Text("Column with spacing"),
      Column(
        children: addVerticalSpacing(10, 
           [
             Text("Text1"),
             Text("Text2"),
             Text("Text3"),
           ]),
      ),
      Text("Row with spacing"),
      Row(
        children: addHorizontalSpacing(10,
           [
             Text("Text1"),
             Text("Text2"),
             Text("Text3"),
           ]),
      ),
    ]
  ); 
}