Griffin Outdoor Living is the retaining wall contractor Front Range homeowners call after clay soil and freeze-thaw movement have already pushed a wall out of plumb once. We build boulder, block, concrete, and timber walls engineered to stay put through the next twenty winters, not just the first one.
Denver Metro and the foothills sit on expansive, clay-heavy soil that swells when it’s wet and shrinks when it dries out. A wall built without engineered backfill and drainage can start leaning or cracking within a few seasons, long before a homeowner expects to think about it again.
Freeze-thaw adds a second load on top of that. Water trapped behind a wall face freezes and expands, pushes the wall forward, then thaws and lets it settle back a little less each cycle. A few winters of that repeated push is what turns a hairline gap into a wall that’s visibly out of plumb.
We design every wall around that movement: a compacted base set below the frost line, free-draining backfill, a perforated drain line, and geogrid reinforcement on anything retaining more than a couple of feet of soil. The engineering happens before the first stone or block goes in, not after the wall starts to move.
The right material depends on wall height, how the site drains, and what the wall carries, not just budget.
Natural boulders set as a gravity wall, each stone keyed against the next so the wall can flex slightly as clay shifts without cracking a mortar joint. Best for informal grade changes and walls under four feet.
Interlocking concrete units tied back into the slope with geogrid, the system we spec most for taller walls and any wall carrying a driveway or patio load above it.
A reinforced concrete stem wall for the tallest or most heavily loaded sites, where a gravity wall alone can't hold back Front Range clay.
Pressure-treated timber for garden beds and low terrace walls, priced below stone or block, with a shorter service life where soil stays consistently wet.
The same sequence we use on every retaining wall project, adjusted to your site and material.
We walk the site, note slope, drainage paths, and soil condition, and talk through what the wall needs to hold back.
You get a wall design matched to material, height, and any structure it will support, along with a firm quote.
We pull the permit where the wall's height or location requires one and handle excavation, base, drainage, and construction.
We walk the finished wall with you, confirm the drainage is doing its job, and cover how to care for it.
Leveling a slope for a new wall often creates a flat spot worth building on. If that's your project, ask about a custom paver patio installation laid into the space the wall opens up, engineered for the same clay and freeze-thaw cycles.
A new wall changes how water and planting beds sit on a slope. Our landscape design services plan drainage and beds around the wall so the two work together instead of against each other.
Material, wall height, and how much engineering the site needs are the three biggest factors. A boulder wall under four feet costs less per linear foot than a taller segmental block wall with geogrid and a footing below the frost line, and site access changes the number too. We measure your actual retaining wall installation cost during a free on-site consultation instead of quoting a flat rate that ignores your soil and grade.
Most Front Range jurisdictions require a permit once a wall passes a certain height, sits near a property line, or supports a structure like a driveway or deck above it. We pull whatever permit your wall needs as part of the build, so you’re not tracking down inspections on your own.
Many Colorado municipalities follow the standard building code trigger and require a stamped engineering plan once a retaining wall passes four feet, though the exact rule varies by city and by what sits above the wall. We confirm the requirement with your local building department before design starts, so the wall you get approved is the wall you get built.
Only if the wall wasn’t built for it. Clay holds water against the back of a wall far longer than sandy soil, and that trapped water is what freezes and pushes a wall out of plumb over a few winters. Every wall we build accounts for that with a drain line, free-draining gravel backfill, and weep holes, so clay soil isn’t a bigger risk than any other lot on the Front Range.
It depends on how far the wall has moved and whether it had proper drainage to begin with. A wall leaning because water was never draining behind it usually needs to come down and be rebuilt with the right backfill; a structurally sound wall showing minor settling can sometimes be corrected without a full rebuild. We can tell you which one you have during a site visit.
A wall built without a plan for where water goes can push runoff onto a neighbor’s yard instead of stopping it, which is one of the more common disputes we get called in to fix. We grade and drain every wall so water keeps moving to where it already legally flows.
Tell us what the slope is doing on your property and we’ll bring a design suited to your soil, not a template.
Free Consultation · No Obligation · Serving South Denver & Foothills