Lone Tree Retaining Walls

Same length, same height, quotes a long way apart. It happens constantly on wall work, and the homeowner is left assuming somebody is padding the number. Usually nobody is. One bid is for a wall. The other is for a wall plus everything behind it that keeps a wall from leaning, and those two products cost very different money.

So here's where the budget actually goes on a Lone Tree retaining wall, roughly in order of impact, and which line items you'd regret trimming. No dollar figures, because a two foot garden edge and a seven foot cut behind a walkout are not the same species. The drivers, though, are the same all over Douglas County.

Height is the multiplier everything else hangs off

Doubling a wall's height does not double the cost. It does something worse, because the pressure pushing on it grows faster than the wall does. A short wall holds a modest wedge of soil. A tall one holds a much bigger wedge, and that load has to be answered with a wider footing, more steel, a thicker stem, or a system that leans back into the hill.

Past a certain height a wall stops being landscaping and becomes a structure that needs an engineer's stamp and a permit. That's not a formality anybody invented to slow you down. It's the line where a failure stops being embarrassing and starts being dangerous. Our engineer works on staff, so when your project crosses that line the design happens in house and the schedule doesn't stall waiting on an outside consultant.

What actually moves the number on a wall

The gravel nobody sees is the line item worth defending

Almost every failed wall we tear out died the same way. Water collected behind it, the soil back there got heavy and pushed, and nothing gave that water a route out. The wall didn't lose an argument with dirt. It lost one with hydrostatic pressure, and pressure like that will win against concrete every time you let it build.

The counter is unglamorous. Free draining rock against the back face, filter fabric so fines don't clog it, perforated pipe at the bottom running somewhere useful, and weep holes through the face for whatever the pipe misses. It buries value in a place no guest will ever admire. Cut it out of the bid and the wall looks identical on day one and starts telling on itself after the second wet spring. That's why we won't quote a wall without it.

What sits behind a wall we build

• Footing carried down below frost and onto verified bearing soil
• Reinforcing steel sized and placed to our engineer's design, not a rule of thumb
• Batter or setback so the wall leans into the slope rather than standing plumb against it
• Washed drainage rock across the full back face, not a token shovel at the bottom
• Filter fabric separating rock from native soil so the drain stays open
• Perforated collector pipe with real fall and a discharge point that works
• Weep holes through the face at spacing, kept clear of fines
• Compacted lifts behind the drainage zone and grade above shaped to shed runoff

Where walls end up around town, and when we build them

The sloped custom lots in Heritage Hills and Carriage Club generate the tall structural work: terracing a side yard, cutting a flat pad for a pool or a sport court, holding a grade change behind a walkout basement. Fairways and Montecito bring mid height walls carved out of established landscaping, which means hand work and careful access. Newer construction around RidgeGate sends us walls the original builder sized for looks instead of load.

Building season for walls runs spring through late fall. We want workable soil for excavation and compaction, and we want the backfill placed and settled before frost. Winter installs are possible on small work, but trenching frozen ground is expensive and compacting frozen soil is pointless. If your wall can wait for April, let it, and spend the winter on design and permits.

The walls we replace almost never broke in the concrete. They broke because somebody saved a few hundred dollars on rock and pipe, and then water spent five winters collecting the debt.

From the crew lead on these jobs