How to fix gaps under a fence

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Introduction

Over time, it’s common to notice gaps forming under your fence. These spaces may appear because of uneven ground, soil erosion, shifting posts, or natural settling. While small gaps might not seem like a big deal, they can let pets escape, allow pests to enter, or reduce privacy and security. The good news? Learning how to fix gaps under a fence is straightforward, and there are multiple methods depending on your needs and budget. This guide will show you step by step how to close those gaps quickly and effectively so your fence looks neat and functions as it should.

Why Fixing Gaps Under a Fence Matters

Leaving gaps unattended can cause more problems than you think:

  • Keeps pets and children safe – Prevents them from squeezing underneath.
  • Blocks unwanted animals – Stops rabbits, raccoons, or stray dogs from getting into your yard.
  • Improves security – Eliminates weak spots where intruders could enter.
  • Enhances appearance – Creates a cleaner, more professional-looking fence line.
  • Prevents soil erosion – Filling gaps reduces washouts under your fence during heavy rain.

Taking the time to fix gaps ensures your fence performs its job fully—keeping what’s inside safe and what’s outside where it belongs.

Step-by-Step Guide to Fixing Gaps Under a Fence

1. Assess the Problem

Walk the fence line and measure the size of the gaps. Are they consistent, or do they vary? Small gaps may need a quick fix, while larger spaces might require adding boards or panels. Identifying the cause (erosion, uneven ground, or poor installation) helps you choose the best solution.

2. Gather Tools and Materials

Depending on the method you choose, you may need:

  • Shovel and rake
  • Soil or gravel
  • Pressure-treated boards or fence pickets
  • Chicken wire or welded wire mesh
  • Concrete mix (for permanent fixes)
  • Landscaping timbers or garden edging
  • Screws, nails, or zip ties
  • Power drill or hammer

3. Fill with Soil or Gravel (Quick Fix)

For small gaps, the simplest solution is to backfill the area with soil, mulch, or gravel. Pack the material tightly to minimize erosion. This method works best in gardens or decorative fence lines but may need refreshing over time.

4. Add a Gravel or Rock Barrier

If pets are digging under the fence, place large rocks or a gravel trench along the fence line. Dig a shallow trench, fill it with medium-to-large stones, and cover with decorative gravel. This creates both a barrier and drainage system.

5. Install a Kickboard (Bottom Rail)

A kickboard is a horizontal board attached to the bottom of the fence, closing the gap while protecting the fence panels from moisture. To install:

  1. Measure the gap and cut a pressure-treated 2×6 board to size.
  2. Attach the board horizontally between posts with screws or brackets.
  3. Check alignment to ensure it sits flush with the ground.

This is one of the most durable and professional-looking fixes.

6. Attach Lattice or Pickets

If the gap is larger, add a row of lattice or vertical pickets at the base. Lattice works well for decorative purposes, while pickets maintain consistency with wooden fences. Secure them directly to the fence rails or posts.

7. Use Wire Mesh or Chicken Wire

For pet owners, wire mesh is an excellent solution. Cut the wire to fit the length of the fence and attach it with screws, nails, or zip ties. Bury the bottom 6–12 inches underground to prevent animals from digging through.

8. Install Landscaping Timbers or Garden Edging

Place treated landscape timbers, railroad ties, or garden edging along the bottom of the fence. This method not only fills gaps but also enhances the yard’s appearance. Anchor the timbers with stakes or rebar to prevent shifting.

9. Pour a Concrete Barrier (Permanent Fix)

For maximum durability, especially in areas with frequent erosion, pour a concrete curb under the fence.

  1. Dig a shallow trench under the fence line.
  2. Mix and pour concrete, filling the trench to ground level.
  3. Smooth the surface and slope slightly for drainage.

This creates a permanent, maintenance-free solution.

Common Mistakes to Avoid

  • Mistake 1: Ignoring the Cause
    Simply filling gaps without addressing erosion leads to recurring issues. Solution: Fix grading or drainage first.
  • Mistake 2: Using Non-Treated Wood
    Regular wood rots quickly when in contact with soil. Solution: Always use pressure-treated lumber for kickboards or edging.
  • Mistake 3: Leaving Wire Mesh Loose
    Loose mesh can be pushed aside by pets. Solution: Secure tightly and bury underground for strength.
  • Mistake 4: Overfilling with Soil
    Mounded soil washes away quickly. Solution: Pack soil firmly and reinforce with edging or timbers.
  • Mistake 5: Poor Alignment
    Uneven boards or timbers look sloppy. Solution: Use a level and measure carefully for clean results.

Extra Fence Tips & Hacks

  1. Combine Methods – For extra durability, use both a kickboard and gravel or mesh reinforcement.
  2. Use Decorative Solutions – Consider planter boxes or low garden beds along the fence line to hide gaps naturally.
  3. Regularly Inspect Fence Line – Catch small gaps early before they become large, costly repairs.

For related fixes, check out our guide on how to repair a sagging fence gate, since gates often create the largest ground gaps.

Conclusion

Fixing gaps under a fence doesn’t have to be complicated. Whether you choose a quick fix like filling with soil, a durable method like adding kickboards, or a permanent solution like pouring concrete, you’ll restore security, safety, and appearance to your fence line. By addressing the cause of the gap, using the right materials, and avoiding common mistakes, you’ll enjoy a strong, neat fence that does its job properly.

Bookmark this guide so you’ll always know the best way to close fence gaps in your yard.