Retaining Wall Construction & Repair
Duluth is built on a hillside, and hillsides move. We build block, boulder and timber walls that hold that grade back — and rebuild the ones that didn't.
The Most Duluth Project There Is
Half the properties in this city sit on a slope. That means terraced yards, cut-in driveways, walk-outs, and garden beds that only exist because something is holding the hill back. When those walls fail — and eventually they all do — you get bulging courses, a wall leaning out at the top, soil washing onto the driveway, and a repair bill that grows every season you wait.
A retaining wall is not a stack of blocks. It's a drainage system with a face on it. The walls that last have a compacted base below frost, clear stone backfill, a drain tile that actually goes somewhere, and geogrid tying the wall back into the hill on anything with real load. That's the difference between thirty years and three. We build them that way, and we rebuild failing walls the same way rather than re-stacking the same problem.
What We Handle
- New retaining wallsSegmental block, boulder & natural stone
- Timber & landscape-tie wallsTraditional look, properly deadmanned
- Retaining wall repairLeaning, bulging & separating courses reset
- Wall rebuildsFailed walls taken down and built back right
- Terraced yardsTwo or three shorter walls instead of one tall one
- Drainage & drain tileThe part that actually decides how long it lasts
- Garden & planter wallsLow walls that define beds and borders
- Driveway & parking edgesHolding back the cut on a hillside drive
- Walk-out & patio wallsUsable flat ground carved out of a slope
- Steps built into wallsBlock or stone treads through the grade
- Caps & finishingCapped, adhered and sealed against freeze-thaw
- Erosion repairRegrading and stabilising after washouts
Common Retaining Wall Projects
| Project | What's included | Good to know |
|---|---|---|
| Garden / border wall (under 2 ft) | Base, block, backfill, caps | Fast, high-impact, no permit in most cases |
| Standard wall (2–4 ft) | Compacted base, drain tile, clear stone, geogrid, caps | Our most common wall — the drainage is the whole job |
| Terraced walls | Two or more short walls stepped up the slope | Often cheaper and stronger than one tall wall |
| Repair or rebuild | Take down, fix base and drainage, rebuild with your block | We reuse sound block wherever we can |
Frost, Clay and a Hill That Wants to Move
Northland retaining walls fail for three predictable reasons: a base that isn't below frost, no drainage behind the wall, and water with nowhere to go. Frost here drives four feet down, and saturated clay behind a wall exerts far more pressure than dry soil. Every wall we build gets a compacted base, clear stone backfill and a drain tile with a real outlet — which is exactly the part the failed walls we're called to rebuild are missing.
Retaining Wall Questions
How tall a wall can you build?
We build up to about four feet. Past that, most jurisdictions around here — Duluth and Superior included — require an engineered design and a permit, because the forces get serious fast. If your slope needs a taller wall, we'll tell you at the quote and point you to an engineer rather than quietly building something that isn't rated for it. Often the better answer is two shorter terraced walls, which we can build without engineering.
My wall is leaning. Repair or replace?
It depends on why. If the block is sound and the problem is drainage or a settled base, we take it down, fix what's underneath and rebuild using your existing block — much cheaper than new material. If the block is cracked or spalling from freeze-thaw, replacement is the honest answer. We'll show you what we find before deciding.
Do I need a permit for a retaining wall?
Usually only above a certain height — commonly four feet, though it varies by city and by whether the wall carries a surcharge like a driveway above it. We check the rules for your address and handle the permit if the project needs one.
When can retaining walls be built up here?
Roughly May through October, once the ground has thawed enough to excavate and compact properly. Wall work booked in late summer often lands the following spring, so call early if you want it done this season.
Related Services
Is Your Hill Winning?
Leaning wall, washed-out slope, or a terrace you've always wanted — send photos and we'll quote it free.