1. Identify Entry Point

2. Close off other entrances

For animals that are living under your porch or house or in your attic, etc, such as: Skunks, Groundhogs & Raccoons, the use of a one-way door will often humanely correct the situation.
Once you have identified the entry point, as identified in the first photo, it is imperative that all other entry points are closed off. This can be done by putting dirt and-or gravel or rocks/patio stones over the alternative entrances/exits.

3. Make a one-way door

To make a one way door (as pictured) Your will need a piece of wood approximately 24 inches(wide) X 11 inches(high). (White and red piece)

Cut the door (pictured in red) approximately 7inches X 7inches. On the bottom outside of the door you should have a piece of wood slightly larger than the door. (to keep it from going back through the opening & to provide weight to keep the door closed)

The hinge (pictured in yellow) must be bolted (or screwed) to the top on the outside.

4. Angle inserts on both sides

The door should be angled with the bottom further out than the top. (See natural wood angled strips in photo.)

5. Dig out hole to fit door

Some digging may be required to place the one-way door securely in the opening.

6. Secure door into position

The one-way door must be secured to the house or steps, etc, with screws or rocks, dirt etc. It can remain in place for a week or so and the animals should be excluded by that time.

7. Make sure it opens

Make sure that the door opens and closes freely.

Once you are sure that all of the animals have left you can close the hole by filling it with dirt and rocks, etc. It is important to make sure that the hole is firmly filled to prevent reentry.