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Most Edgmont properties sit on one acre or more of sloped, wooded terrain. That’s not a complaint it’s part of why people choose to live here. But when that slope starts sending topsoil across your driveway every spring, or when a third of your backyard is too steep to use, the land stops working for you. A well-built retaining wall changes that. It holds the grade, stops the erosion, and opens up space you didn’t know you had.
Edgmont’s clay-heavy soil is one of the biggest factors most contractors don’t account for. Clay expands when wet and contracts when dry, which puts constant lateral pressure on a wall’s face throughout the year. Add Pennsylvania’s freeze-thaw cycle water soaking into the ground in fall, freezing and expanding in winter, thawing and loosening everything in early spring and you understand why drainage isn’t optional. It’s the whole game. A wall built without a proper drainage system behind it isn’t a question of if it fails. It’s when.
Get this right and the return is real. Property appraisers consistently estimate 100 to 200 percent ROI on well-designed retaining walls. On a home in Okehocking Hills or Runnymeade Farms, where properties regularly list above a million dollars, that’s not a small number. You’re not just fixing an erosion problem. You’re adding usable space, protecting the property, and making a decision that holds its value.
We’re based in Aston, right here in Delaware County, and we’ve been building retaining walls across Edgmont and the surrounding townships for years. Renato Spennato holds an active Pennsylvania contractor license and a BuildZoom score that puts us in the top 11 percent of licensed contractors statewide. That’s not a credential pulled from a brochure it’s a verifiable number that reflects years of doing this work correctly.
What actually matters to most homeowners isn’t the score. It’s whether the contractor answers the phone two winters from now if something needs attention. With us, you’re not dealing with a rotating crew or a company that hands your project off after the deposit clears. The same team that walks your property, designs the drainage plan, and builds the wall is the same team that’s accountable when it’s done.
Edgmont’s permit process has more layers than most people expect zoning permits, building permits for walls over four feet, HOA approval requirements in neighborhoods like Reserve at Springton, and specific plot plan requirements if you’re on a private septic system. We know this process because we work in this township. That familiarity isn’t a talking point. It’s what keeps your project from stalling before a single block gets placed.
It starts with a site visit. Not a phone estimate, not an online quote form an actual visit to your property. Edgmont lots are too varied and too complex for guesswork. We walk the slope, read the drainage patterns, check soil conditions, and note anything that affects the design: the location of your septic system if you’re on private septic, proximity to mature trees, HOA setback requirements if you’re in an association-governed community, and how water currently moves across the property during a heavy rain.
From there, we plan the drainage system before we plan anything else. This is the step most contractors skip or treat as secondary. On Edgmont’s clay soil and sloped terrain, it’s the step that determines whether your wall is still plumb in ten years. We select materials natural stone, concrete block, or VERSA-LOK segmental systems based on what the wall actually needs to do, not what’s easiest to install.
Once the design is confirmed and the permit is in hand, we build. Edgmont Township requires a zoning permit for any retaining wall and a building permit with engineer-sealed plans for walls four feet or taller. If your neighborhood has an HOA, that approval has to come before the township will issue anything. We handle the documentation and coordinate with the township’s inspection process through Linn Architects so there are no surprises mid-project. When we’re done, you have a wall that’s fully permitted, properly drained, and built to handle whatever Pennsylvania winters throw at it.
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Every retaining wall project we take on in Edgmont starts with the same question: what is this wall actually up against? The terrain around Ridley Creek State Park, the wooded ridgelines along Valley Road, the creek corridors near Providence Road these aren’t flat suburban lots. The grade changes are real, the soil holds water, and the freeze-thaw pressure is constant. The material and drainage system we recommend are always a response to those conditions, not a default selection.
We work with natural stone, VERSA-LOK segmental retaining wall systems, and concrete block. Natural stone is the right call when the property’s character demands it and longevity is the priority a well-built stone wall can last a century. VERSA-LOK is ideal when the structural demands are high and a clean, engineered look fits the home. Concrete block works well for mid-range projects where durability and cost efficiency need to balance. We explain the trade-offs in plain language so you can make the call with full information.
For properties in Edgmont’s HOA communities Okehocking Hills, Reserve at Springton, Springton Chase we factor in the association approval process from the start, because the township won’t issue a permit without it. For properties on private septic, we design around the drain field and include the required locations on your permit plot plan. The wall you end up with isn’t just structurally sound. It’s compliant, documented, and built for the specific property it’s sitting on.
Yes, and the requirements depend on how tall the wall is. Any retaining wall in Edgmont Township requires at minimum a zoning permit there’s no height threshold below which you can skip the permit process entirely. For walls four feet or taller, you’ll need a full building permit, and the application must include plans sealed by a registered architect or engineer. That’s a meaningful distinction because it adds both cost and lead time to the project, and it’s something worth knowing before you start getting quotes.
There’s also a layer most contractors don’t mention upfront: if your property is in a neighborhood with a homeowners association which applies to several Edgmont communities including Okehocking Hills and Reserve at Springton the township won’t issue your permit until you have written approval from the HOA in hand. Getting that sequence wrong delays everything. On top of that, if you’re on private septic, your plot plan submission needs to show the location of your septic system and any wells. Edgmont’s permit process is more involved than most Delaware County townships, and working with a contractor who already knows it saves you time and headaches.
Clay soil behaves differently than sandy or loamy soil in ways that directly affect how a retaining wall performs over time. Clay expands when it absorbs water and contracts when it dries out. That constant movement creates lateral pressure against the back of the wall pressure that compounds with every wet season. On a property in Edgmont where the soil holds moisture longer due to shade from the tree canopy and the natural slope of the terrain, that pressure is more sustained than it would be on an open, flat suburban lot.
The answer is drainage, and it has to be engineered into the wall from the start not added as an afterthought. A properly built retaining wall in this area includes a drainage layer of crushed stone behind the wall face, perforated pipe at the base to direct water away, and weep holes or outlets that give water somewhere to go before it builds up pressure. Skipping or cutting corners on this step is the most common reason retaining walls in Delaware County start to lean or shift within the first few years. Pennsylvania’s freeze-thaw cycle makes it worse: water that doesn’t drain properly freezes behind the wall in winter and expands, accelerating the failure.
The honest answer is that it depends on the specific conditions of your property the height of the wall, the degree of slope, the soil load it needs to hold, and how close it is to structures, trees, or your septic system. That said, there are patterns that hold up across most Edgmont properties.
VERSA-LOK segmental systems are a strong choice for walls that need to handle significant structural loads on steep slopes. The interlocking design and compacted aggregate base give you engineering-grade performance with a finished look that fits well on larger, upscale properties. Natural stone is the right call when longevity and aesthetics are both priorities a dry-laid or mortared stone wall built correctly can outlast the house. Concrete block sits in the middle: durable, cost-effective, and well-suited for mid-height walls where the structural demands don’t require the premium of stone or VERSA-LOK. For Edgmont’s large-lot properties particularly in neighborhoods like Runnymeade Farms or along Valley Road where homes sit on 1.4-acre lots with meaningful grade changes the wall often needs to do more than one job: hold a slope, manage drainage, and create usable terraced space. Material selection has to account for all of that, which is why a site visit before any recommendation is non-negotiable.
It does, and it’s one of the most important things to sort out before any design work begins. A meaningful portion of Edgmont Township properties rely on private septic systems and wells rather than municipal water and sewer this is one of the ways Edgmont differs from most other Delaware County towns. Excavating in the wrong location on a property with a septic drain field can damage the system, create regulatory violations, and trigger remediation costs that far exceed the retaining wall budget.
Edgmont Township’s permit process actually requires this information on the plot plan you submit with your application. The location of your septic system, wells, and any pipelines crossing the property all need to be shown. A contractor who doesn’t ask about your septic system at the first site visit and who doesn’t include it correctly on the permit documentation is either unfamiliar with Edgmont’s requirements or cutting corners on the paperwork. Either way, the homeowner carries the risk. We ask about septic and well locations before we design anything, and we build the wall placement around those constraints from the start.
Spring and early summer are the most active seasons for retaining wall installations in Edgmont, and contractors typically book out four to eight weeks during that window. The practical reason is that freeze-thaw damage becomes visible in late winter and early spring shifted blocks, soil washout on driveways, erosion in garden beds and homeowners start making calls as soon as they see it. If you wait until May to start looking, you’re likely scheduling into midsummer at the earliest.
The smarter move is to start the conversation in late fall or winter. Contractors have more availability, you’re not competing with every other homeowner who just watched their yard wash out, and you can get on the schedule for an early spring start. For Edgmont properties specifically, early spring installation also makes sense because the ground has thawed enough to work but hasn’t yet gone through another full wet season of erosion. If your wall is addressing an active drainage problem, every additional spring you wait is another cycle of damage. Getting the permit process started in January or February which takes time even under the best circumstances means you’re ready to build when the conditions are right.
Retaining wall pricing ranges widely from roughly $40 to $345 per linear foot depending on material, wall height, drainage requirements, and site conditions. For a typical residential project in Edgmont, most homeowners are looking at somewhere between $3,500 and $10,000, though larger or more complex walls on steep, wooded lots can run higher. That wide range exists because two walls that look similar from the street can be completely different projects underneath different soil loads, different drainage demands, different permit requirements, different access constraints.
For Edgmont specifically, a few factors tend to push projects toward the higher end of the range. Large lot sizes mean walls often need to span more linear footage or address multiple elevation changes. Clay soil and steep slopes require more robust drainage systems than you’d need on a flat suburban property. And if your wall is four feet or taller, you’re adding the cost of engineer-sealed plans to the permit application. The best way to get a number you can actually use is to have someone walk your property and assess the specific conditions not fill out a form online. We don’t quote retaining wall projects without a site visit, because a number produced without seeing the slope, the soil, and the drainage situation isn’t a quote. It’s a guess that will change once we get there.
