What areas does Blue Tree serve for retaining wall design and construction?

Blue Tree's ICPI-certified hardscape team has built retaining walls across Montgomery, Bucks, Chester, Delaware, Lehigh, Berks, and Philadelphia Counties since 1983. The design center, yard, and offices are at 4494 Skippack Pike, Schwenksville, PA 19473, and one in-house team designs and builds each wall from the first site visit through the final walkthrough.

Retaining Wall Design & Installation in Southeastern PA

What Sets Blue Tree's Retaining Walls Apart

A retaining wall holds back tons of soil and water, and a wall that fails is dangerous, not just unsightly. Blue Tree builds walls the right way: a proper base, engineered backfill, drainage behind the wall, and geogrid reinforcement where the height and load require it. Walls are also designed, used to create level patios, terraced gardens, and seat walls rather than just stacking block. Blue Tree builds with Belgard and Techo-Bloc wall systems and natural stone, handles permits and engineering in-house, and has built across Montgomery, Bucks, Chester, Delaware, Lehigh, Berks, and Philadelphia Counties since 1983.

Written by Chad Ochnich, Blue Tree's co-owner and ICPI-certified hardscape lead, and reviewed by sales manager Jérôme Besnard.

Established

Engineered

Drainage and Backfill

70 to 90

Employees

Our Retaining Wall Process, Step by Step

From the first site visit to the final walkthrough, one team designs and builds your wall. Here is how it comes together.

Step 1: Free On-Site Consultation

A Blue Tree designer walks your property, reads the slope, soil, and where water moves, and talks through what the wall needs to do: hold grade, create level space, or define a garden. We discuss materials and budget. The visit is free with no same-day pressure. Timeline: 1 visit, about 60 minutes.

Step 2: Custom Design and 3D Renderings

Your designer plans the wall height, length, and material, specifies reinforcement and drainage for the load, and you review the design, often with 3D renderings, before construction. Timeline: 1 to 3 weeks.

Step 3: Materials, Proposal, and Permitting

Blue Tree specifies the wall system or natural stone, prices the project as one itemized proposal, and handles township permits and engineering for taller walls in-house. You approve materials before anything is ordered. Timeline: 2 to 6 weeks, varies by township and engineering.

Step 4: Professional Installation

Crews excavate, build a proper leveling base, set drainage and geogrid reinforcement where required, and build the wall course by course with engineered backfill. The drainage and reinforcement behind the wall are what keep it standing. Timeline: 1 to 4 weeks, varies by size.

Step 5: Aftercare & Warranty

Blue Tree backfills, grades, and can restore surrounding landscape and hardscape with the same team, then walks the finished wall with you. You leave with warranty terms in writing, including manufacturer warranties on wall products. Timeline: a few days.

Retaining and Garden Walls for Every Property

Walls do different jobs at different heights. These are the wall types Southeastern PA homeowners ask Blue Tree to build.

Structural Retaining Walls

Engineered walls that hold significant grade, built with drainage and reinforcement to last.

Curved stone retaining wall with a smooth cap borders a patio, featuring neatly trimmed shrubs and flowering plants. Sunlight filters through trees, creating a warm, inviting garden scene.

Terraced Walls

Stepped walls that turn a steep slope into a series of usable, planted terraces.

Seat Walls

Lower walls built into patios for built-in seating and to define outdoor rooms.

A stylish stone patio with outdoor seating, lush green landscaping, a pergola, and decorative pathways beside a stone house on a sunny day.

Garden and Planter Walls

Low walls that frame beds, raise planters, and add structure to the landscape.

Natural Stone Walls

Fieldstone and boulder walls for a timeless, one-of-a-kind look that fits the land.

Pool and Patio Walls

Walls that create level pool decks and patios on sloped lots, planned with the build.

Built for Southeastern Pennsylvania's Soil and Water

Retaining walls fail from water and weak bases, and Southeastern Pennsylvania gives them plenty of both: clay soil that holds water, heavy storms that generate hydrostatic pressure behind a wall, and freeze-thaw cycles that push on anything poorly built. Blue Tree excavates a proper base of compacted crushed stone, installs a minimum 12-inch drainage column of AASHTO 57 aggregate behind the wall, and runs weep holes or a perforated drain pipe at the base to relieve hydrostatic pressure before it builds. For block systems, Blue Tree works with Belgard's Celtik Wall and Weston Stone series and Techo-Bloc's Highland and Lite-Wall systems for segmental retaining walls, and with cut natural stone and Pennsylvania fieldstone for homeowners seeking a traditional or naturalistic aesthetic. Pennsylvania building code and most local townships require an engineer's stamp and a permit for any wall exceeding 4 feet in height measured from the bottom of the footing. Blue Tree engages the structural engineering review and handles permit submissions in-house for those projects. Chad Ochnich's ICPI-certified hardscape team has built walls across Montgomery, Bucks, Chester, Delaware, Lehigh, Berks, and Philadelphia Counties since 1983.

A curved stone walkway bordered by dark bricks winds through landscaped gardens with green shrubs, ornamental grasses, mulch, and solar path lights, leading to a patio area in a spacious yard.

Build the Whole Sloped Lot

Paver Patios. Level patio space created by the wall. Explore paver patios.

Steps and Walkways. Connect the terraces a wall creates. Explore walkways.

Planting and Drainage. Plant the terraces and manage water from the same plan. Explore landscaping.

A landscaped area with green shrubs, large stone boulders, and a curved concrete pathway beside a beige stucco house with a window and decorative wall art. Blue sky with clouds is visible in the background.

Curated Transformations

Browse recent retaining wall and hardscape projects from across Montgomery, Bucks, Chester, Delaware, Lehigh, Berks, and Philadelphia Counties.

Everything Your Outdoor
Space Needs. One Team.

From the pool to the patio to the plants that frame it all. We handle the full picture so nothing falls through the cracks.

A luxurious backyard pool features stone walls with multiple cascading waterfalls, built-in lights, fire bowls, and surrounding lush greenery and flowers, creating an elegant and relaxing outdoor space.

Custom Pools & Water Features

Resort-style pools, spas, waterfalls, and grottos, designed for your property, not from a catalog

Explore Pools

Stone outdoor kitchen with built-in grill built by Blue Tree

Patios, Walls & Outdoor Kitchens

Structures built to last generations by craftsmen who take pride in the details

Explore Hardscaping

A well-maintained front yard features neatly trimmed grass, vibrant flower beds, shrubs, and small trees in front of a stone house, all bathed in warm sunlight.

Landscape Design & Planting

Native plants, seasonal color, and designs that thrive in Southeastern PA's climate

Explore Landscaping

A green fertilizer spreader sits on a neatly mowed lawn in front of a suburban house, surrounded by well-kept bushes and colorful flowers on a sunny day.

Lawn Programs

Science-backed fertilization, weed control, and aeration for the lawn your neighbors will notice

Explore Turf Care

A luxurious backyard at dusk features a glowing swimming pool, landscaped gardens, and warm path lighting, with a large house and outdoor seating area illuminated in the background, surrounded by tall trees.

Landscape Lighting

Professionally designed LED systems that add safety, security, and ambiance after dark

Explore Lighting

A large, well-manicured green lawn in front of a stone house with landscaped flower beds, bushes, and small trees, surrounded by tall trees with autumn foliage.

Year-Round Care

Seasonal cleanups, pool service, and ongoing care that keeps everything looking its best

Explore Maintenance

Common Questions

An Allan Block or Versa-Lok gravity wall 3 feet high and 20 linear feet long runs $4,500 to $9,000 installed. An engineered retaining wall at 6 feet high over the same length runs $12,000 to $25,000 or more, depending on geogrid and drainage requirements. Natural fieldstone costs $6,000 to $15,000 per 20 linear feet installed, depending on stone availability and mason labor. Southeastern PA projects frequently add engineering fees ($1,500 to $3,500 for a PE stamp) and permit fees ($300 to $800 in most townships) for walls over the municipal height limit. The free consultation includes a site visit, a grade measurement, and a discussion of whether your wall height triggers engineering requirements in your specific township.

In Pennsylvania, walls over 4 feet in height measured from the bottom of the footing to the top of the wall require a licensed Professional Engineer stamp on the design drawings in most jurisdictions. Many townships in Montgomery, Bucks, and Chester Counties have adopted even stricter thresholds, requiring a PE for walls over 3 feet because of the clay soil conditions in this region. Blue Tree works with licensed PE firms on all walls that meet or exceed the local threshold. This is not optional and it is not a formality. A retaining wall built on Worsham series clay without a PE-reviewed drainage and geogrid design can fail within 5 years under the lateral hydrostatic pressure that builds up behind it during southeastern PA's heavy spring rain season.

ICPI standards, which govern the segmental retaining wall blocks Blue Tree installs, require a deadman anchor buried 3 feet into the hillside at every 4th block course. This anchor extends the wall's resistance to the overturning pressure exerted by the soil mass behind it. Geogrid reinforcement is required by ICPI standards and PA building code for walls over 3 feet in clay soils because clay hydrates after rain events and can exert 4 to 6 times the lateral pressure of sandy soil against a wall face. Blue Tree holds ICPI certification through co-owner Chad Ochnich, who oversees geogrid and deadman specifications on every retaining wall project. Skipping geogrid to reduce material cost is the single most common cause of segmental wall failure in southeastern PA.

A properly built retaining wall in southeastern Pennsylvania requires three drainage components working together. First, geotextile filter fabric lines the soil face of the excavation to prevent clay fines from migrating into the drainage aggregate. Second, 3/4-inch clean stone fills the 12-inch zone immediately behind the wall blocks. Third, a 4-inch perforated pipe at the base of the wall collects water and discharges it to daylight or a dry well away from the structure. This system is the minimum standard for any retaining wall built on the clay-heavy soils that dominate Montgomery, Chester, Delaware, and Bucks County residential lots. Walls built on Worsham series soils without this drainage system typically fail within 3 to 7 years due to hydrostatic pressure buildup, particularly after the heavy spring rains that deliver 12 to 14 inches of precipitation in March through May.

Segmental retaining wall blocks such as Allan Block and Versa-Lok are the most cost-effective option and are fully rated for southeastern PA freeze-thaw conditions. They are installed dry (no mortar), which allows water to pass through the wall face and reduces hydrostatic pressure. Natural fieldstone provides a traditional character that suits Pennsylvania farmhouse and colonial architecture well, but it requires a skilled mason, deeper footings below the 36-inch frost line, and more labor, which pushes cost 30 to 50 percent higher than segmental block. Dry-laid fieldstone without a continuous footing does not meet PA building code for walls over 4 feet and carries no manufacturer warranty. Pressure-treated timber walls were common in the 1980s and 1990s but are not recommended for new construction because timber deteriorates in southeastern PA clay moisture conditions within 15 to 20 years.

Water is the primary cause of retaining wall failure in southeastern Pennsylvania. The region averages 46 inches of precipitation annually, with the heaviest rainfall concentrated in spring. Clay soils do not drain quickly, so water accumulates behind a wall and creates hydrostatic pressure that pushes outward against the wall face. A wall without drainage can see pressure equivalent to hundreds of pounds per linear foot after a heavy rain event. Blue Tree prevents this through a complete drainage system on every retaining wall project: geotextile fabric, clean stone backfill, and a perforated pipe that routes water away from the wall base before pressure can build. For walls over 4 feet, our PE partners specify drainage calculations as part of the engineered design. This system, combined with ICPI-standard geogrid and deadman anchors, gives Blue Tree retaining walls a design life of 30 to 50 years in southeastern PA conditions.

Retaining Wall Design and Construction in Southeastern Pennsylvania

What Sets Blue Tree's Retaining Walls Apart

Our Retaining Wall Process, Step by Step