3 Big Mistakes That Turn DIY Retaining Walls into Tear-Outs

The Disaster That Could Have Been Avoided

Joe thought he could tackle his backyard retaining wall himself. He didn’t plan for drainage or check for underground utilities. A year later, the wall bowed, cracked, and had to be torn down and rebuilt professionally. That’s a tough lesson, and one I see too often.

Retaining walls aren’t just stacked stones or blocks. They deal with pressure from soil, water, and freeze-thaw cycles. Get any step wrong, and your wall won’t last.

The 3 Biggest Mistakes Homeowners Make

1. Skipping the Drainage

Water is the enemy of any retaining wall, especially in places with freeze-thaw cycles. Without proper drainage behind the wall, water builds up, freezes, and pushes the wall outward.

You need:

• Drainage pipes (perforated pipe at the base)
• Gravel backfill behind the wall
• Proper slope to away from the wall

2. Not Calling Before You Dig

Utility locates are mandatory. Buried lines for water, gas, electricity, or telecom can run right where you plan to dig. Hitting one can be dangerous and costly.

Always call your local utility locate service before breaking ground.

3. Failing to Get Permits

Municipal permits aren’t just bureaucratic red tape. They ensure your wall complies with local codes and structural requirements.

Failing to get permits can lead to fines or having to remove your wall entirely.

The Tool Kit Reality

Here’s what you really need:

• A sturdy shovel and pickaxe for heavy digging.
• A level and string line for alignment.
• Gravel and drainage pipe for backfill.
• Compactor (manual or mechanical) to settle the base.
• Gloves and knee pads—you’ll be down on the ground a lot.

5 Steps to Avoid These Mistakes

1. Plan your wall location and design carefully.
2. Call for utility locates at least a week before you start digging.
3. Check local bylaws and get the required permits before construction.
4. Excavate the site, ensuring a level, compacted gravel base.
5. Install drainage and backfill as you build, then finish with topsoil and vegetation.

The Canadian Reality

Remember, your wall must handle shifting soils caused by freeze-thaw cycles. That means the drainage and backfill are even more critical than in milder climates. Build in the short construction season window when the ground isn’t frozen or muddy.

Don't Do This List

• Don't ignore water drainage behind the wall.
• Don't skip utility locate calls thinking it'll be quick.
• Don't build without permits — expensive headaches follow.

In the end, a retaining wall must be strong, stable, and well-drained to last. Avoid these big mistakes and you'll save time, money, and frustration.