How to Build a Cat Shelter for Stray and Feral Cats

With temperatures dropping, providing a warm shelter can make a world of difference for stray and feral cats, helping them stay comfortable and safe from harsh winter conditions. Here’s a step-by-step guide to building a simple, effective, and insulated cat shelter, with suggestions on useful materials you can buy online to streamline the process.


1. Understanding the Needs of Stray and Feral Cats

Feral and stray cats face unique challenges in winter, including exposure to low temperatures, rain, and snow. A cat shelter provides not only warmth but also protection from predators. The ideal shelter:

  • Is small enough to retain warmth, but large enough for one or two cats.
  • Has waterproof, insulated walls to resist moisture.
  • Features an entrance that provides easy access but limits exposure to wind.

Let’s go over how you can create a shelter that meets these needs with a few materials and some simple construction.


2. Step-by-Step Guide to Building a Cat Shelter

Materials Needed

To build a sturdy, winter-proof cat shelter, here’s a list of recommended materials:

Construction Steps

shelter instructions

  1. Prepare the Storage Bin
    Using the box cutter, cut a round opening on one side of the bin, about 6-8 inches in diameter and roughly 3 inches above the base. This keeps the interior dry and warm while providing easy access for the cats.
  2. Add Insulation
    Line the inner walls, floor, and lid with foam insulation board. Cut each piece to fit snugly. Ensure that there’s a bit of space between the insulation and the plastic walls to maximize warmth retention. Use duct tape to secure the insulation.
  3. Install the Mylar Thermal Blanket
    Place a Mylar thermal blanket on the inner walls over the foam insulation to reflect heat back into the shelter. Secure it with tape. This blanket can be especially helpful in keeping the shelter warm without additional heating.
  4. Add Straw Bedding
    Fill the shelter with a thick layer of straw. Unlike blankets or towels, straw resists moisture and remains dry, making it an ideal insulating material. Avoid using hay, as it absorbs moisture and can lead to mold or mildew, which is unsafe for cats.
  5. Secure the Lid
    Snap the lid onto the bin tightly. You can reinforce the lid with weatherproof duct tape to ensure it stays closed and protects the interior from snow and rain.

3. Alternative Shelter Options for Winter

If DIY construction isn’t ideal, there are a few pre-made cat shelters you can purchase and modify for extra insulation.

  • Insulated Kitty House
  • Portable Outdoor Cat Shelter

4. Additional Tips for Keeping Cats Warm

  1. Shelter Placement
    Position the shelter near bushes or against a wall to protect it from strong winds and provide extra warmth. Avoid setting it directly on the ground; place it on bricks or wood pallets to keep it dry.
  2. Create a Wind Block
    If the area is very windy, create a small “door flap” with thick, weatherproof plastic over the entrance. This protects the cats from gusts without obstructing access.
  3. Refresh Bedding Regularly
    To maintain a clean, dry shelter, replace the straw every two to three weeks. Wet bedding can reduce warmth and make the shelter uncomfortable.
  4. Ensure Access to Fresh Water
    Provide water daily and consider using a heated bowl if you live in an area where water freezes easily.

5. FAQ on Outdoor Cat Shelters

Q: Why is straw better than hay or blankets for cat bedding?

A: Straw is lightweight, dry, and helps retain warmth without holding moisture. Blankets and hay can get wet, losing their insulating properties and leading to mold or mildew.

Q: How can I make the shelter more stable during winter storms?

A: Secure the shelter to a heavier surface, like bricks or wood, and add weight (such as rocks) around the base to prevent it from tipping over.

Q: Should I add food inside the shelter?

A: It’s best to keep food and water outside the shelter, as spilled food can attract pests. Set up a feeding station nearby instead.

Q: Is a heated shelter necessary?

A: Not necessarily; with proper insulation, cats can stay warm. However, a heating pad made for outdoor pet use can provide extra comfort if temperatures are extremely low.


Building a cat shelter is a simple, impactful way to help feral and stray cats survive the winter comfortably. By following these steps and incorporating the suggested products, you’ll create a safe, warm space that could make all the difference for a cat in need this season.