A big part of what we do isn't building new walls. It's tearing out walls other contractors built and putting in something that'll actually last. Three projects from 2023 and 2024, what was wrong with the original, and what we did differently.
I'm writing this for two reasons. First, if you're shopping for a contractor, these patterns are exactly the things you should look for in any quote you get. Second, if you already have a wall on your property that looks like it's starting to lean or bow, this'll help you figure out how serious it is.
Wall #1: The Centerport timber wall that rotted through
August 2024. Owner called us because their wall along the back of the property was visibly leaning. They'd been told by the original installer years earlier that "that's just how timber walls age." When we got there, the visible lean was about 4 inches forward across the middle 30 feet.
We started by pulling a section. The 6x6 pressure-treated timbers, installed in 1998, had rotted to a soft core. You could push your hand into the wood. The deadman anchors that were supposed to tie the wall back into the slope had rotted with them. The wall was being held up by mass alone, and mass alone wasn't going to hold up much longer.
The original install also had no drainage. No fabric. No stone backfill. No drain pipe. Behind the timbers was just native clay soil, which had been holding water against the wood for 25 years.
What we did. Full tear-out, hauled the rotted timbers to the transfer station. Excavated 18 inches deeper than the original footing line to get to firm subsoil. New 80 LF Nicolock Olde Greenwich wall in two tiers (the upper tier set back 4 feet from the lower) with planting strips between them. Geotextile fabric. 14 inches of clean 3/4" stone backfill. A 4-inch perforated drain pipe at the base, daylighting toward Little Neck Bay. Engineered design, permit filed.
Final invoice: $34,200. The owner had been quoted $19K by another contractor to put up a single-tier timber replacement with no drainage. That wall would have lasted maybe 15 years before starting the same cycle.
Wall #2: The Kings Point concrete wall that bowed
Summer 2024, Great Neck area. A 1958 poured concrete wall, 58 LF, holding back the front yard of a hillside property. The wall had bowed forward about 4 inches over its life, with visible vertical cracks at three points.
This is the one where the homeowner had been told for years that the bowing was "cosmetic." It wasn't. Concrete walls don't bow forward for fun. They bow because the soil pressure behind them is greater than the wall's ability to resist it — and in a poured wall, that means the steel reinforcement inside is failing. Once a poured wall starts bowing visibly, it's structurally compromised.
The other problem with that wall: the back of it had originally been waterproofed with a tar coating that had long since broken down. Water had been seeping through the joints for decades and rusting the rebar. Two of our exploratory cuts showed exposed, severely rusted reinforcement.
What we did. Demo was harder than the build. The 58 LF concrete wall came out in sections over four days using a hydraulic breaker. We hit a 1950s clay drain tile during excavation — owner had no idea it was there, and it had likely been the only thing keeping water away from the wall for the first few decades. We replaced it with a modern 4-inch perforated PVC outlet line tied to a new dry well at the property's southwest corner. New Cambridge Pyzique wall, 58 LF, with geogrid through the upper two-thirds.
Final invoice: $29,400. The Pyzique wall will outlast the homeowner. The poured wall lasted 66 years, which sounds great, but it had been failing for the last 20 of those.
Wall #3: The Cold Spring Harbor block wall with no geogrid
This one stings. A neighboring contractor built a 92 LF segmental block wall in Laurel Hollow in 2018. By 2023, sections of the wall were leaning forward visibly. The homeowner called us to take a look.
The wall was a respectable looking Cambridge MaytRx setup. Block was high quality. The build looked good from the front. But two things were wrong.
First, no geogrid. None. The wall was 5'4" tall at its highest section, which is well into territory where geogrid is required by Cambridge's own engineering tables, and absolutely required by Suffolk County code. The contractor had skipped it.
Second, the backfill behind the wall was native clay, not clean drainage stone. There was a buried 4-inch corrugated black drain pipe behind it, but it was already collapsed and full of dirt — and even when it had been functional, it was on a flat run with no daylight outlet. The pipe was dumping water into the soil behind the wall, not draining it away.
So the wall had been built to look right on day one, but it was a ticking clock. Five years of freeze-thaw cycles with saturated clay pushing on it from behind, and the front face was starting to walk out.
What we did. Demo of the existing block (the block itself was reusable for landscape edging, so the owner kept most of it). Re-excavation 9 feet back from the wall face to install proper geogrid through every fourth course, extending 7 feet into the slope. Full new drainage: geotextile, 12 inches of clean stone, rigid perforated PVC daylighting 22 feet downhill. Rebuild in fresh Cambridge Pyzique (owner wanted to change the color while we were at it).
Final invoice: $52,800. The owner had paid the original contractor around $28K in 2018. Total cost across the two projects: $80,800 for what should have been a single $35-40K job done right.
The patterns to look for in every quote
These three jobs are not unusual. We rebuild several walls a year that share these same problems. If you're shopping for a contractor right now, here's what to watch for in every quote.
- Drainage is itemized, not assumed. The quote should spell out the geotextile, the clean stone (12 inch minimum), the perforated pipe, and where it daylights. If those four things aren't in writing, the wall is being underbuilt.
- Geogrid for any wall over 4 feet. If the wall will be 4 feet or more at any point in its run, geogrid should be in the quote. If it isn't, ask why. There's almost never a good answer.
- Base prep depth specified. 6 to 12 inches of compacted gravel, depending on height. Numbers should be in the quote.
- Engineer's stamp included if the wall is over 4 feet. Most North Shore villages require this. A contractor who skips it is gambling with your permit and your liability.
- Permits filed by the contractor. Not "the homeowner handles the permit." That's a red flag.
- Real cap blocks adhered with concrete adhesive. Not just block on top of block.
If your wall is already showing signs
Walls don't fail overnight. There are warning signs, and most homeowners ignore them until the wall is past saving. Things to look for:
- Visible forward lean of more than 2 inches in a 10-foot section
- Cracks running vertically or diagonally through poured walls
- Block courses separating or "stepping" relative to each other
- Soil washing out from behind or beneath the wall after heavy rain
- Cap blocks shifting or coming loose
- Visible bulges or "belly" in the wall face
If you're seeing any of these, get someone out to look. A failing wall doesn't get cheaper to fix the longer you wait.
Want a second opinion on your wall?
Call us at (631) 792-6546. We'll come look, tell you honestly what's going on, and tell you whether it needs replacement now, in a year, or in five years. No pressure, no obligation. We'd rather give you bad news early than be the contractor who rebuilds it for someone else later.