Retaining Wall Engineer for Stamped Wall Design
Retaining walls designed for your soil, height and surcharge, with drainage details and stamped plans ready for the building department.
- Stamped by a PE licensed in your state
- Built to IBC, IRC and local amendments
- Plan-check comments answered
Retaining walls that hold the hill for decades
A retaining wall holds back thousands of pounds of soil and, after a heavy rain, the water trapped behind it. Walls that fail usually do so slowly, leaning, cracking or sliding over a few seasons, and the repair costs far more than the original design would have. When a wall is tall, carries a driveway or a building, or sits near a property line, building departments want a retaining wall engineer to design it.
PE Engineer designs cantilevered concrete walls, reinforced masonry walls, segmental block walls with geogrid, timber walls and soldier pile walls for homes, commercial sites and industrial yards. Each design accounts for soil type, wall height, slope above the wall, surcharge loads and drainage, and is sealed by a PE licensed in the state where the wall is built.
You get a plan, elevation and section for each wall type, reinforcing and footing details, drainage details and a calculation package, all organized for plan review and easy for a wall contractor to price and build.
What you receive
- Wall plan and elevation with heights
- Typical wall sections by height range
- Footing and reinforcing details
- Geogrid layout for segmental walls
- Drainage and backfill details
- PE stamped calculations and drawings
Retaining walls we design
We choose the wall system that fits the height, site access, appearance and budget, then design it to the soil it retains.
Cantilevered concrete walls
Reinforced concrete stem and footing walls with heel, toe and shear key sized for overturning, sliding and bearing. A durable choice for tall walls and tight sites.
Reinforced masonry walls
CMU walls with grouted cells and vertical reinforcing on a concrete footing, designed to TMS 402 and often finished with stucco, veneer or a split-face block.
Segmental block walls
Dry-stacked concrete block walls reinforced with layers of geogrid in the backfill, designed with the block manufacturer's tested connection and interface values.
Basement and building walls
Foundation walls that retain soil on one side and support the building above, designed for at-rest pressure, floor bracing and waterproofing coordination.
Timber and gravity walls
Treated timber, gravity block and boulder walls for lower heights, landscape terracing and rural sites where a lighter system makes sense.
Soldier pile and lagging
Steel piles with wood or concrete lagging for cuts next to existing buildings, property lines or roads, where there is no room to over-excavate for a footing.
Your Stamped, Permit-Ready Plans Start With One Upload
Send your drawings or describe the project. A licensed engineer reviews it and sends a clear, fixed-fee proposal, often within hours.
- Free and no obligation
- Reviewed by a licensed PE
- Secure file upload
When you need a retaining wall engineer
Many building codes exempt short retaining walls from permits. A common threshold in jurisdictions that follow the IBC and IRC is a wall 4 feet or less in height measured from the bottom of the footing to the top of the wall, provided it does not support a surcharge. Your local rules may be stricter, and the exemption disappears quickly. You will likely need a retaining wall engineer when:
- The wall is taller than your jurisdiction’s exempt height, measured from the bottom of the footing, not from the ground.
- A driveway, parking area, building, pool or sloping hillside sits above the wall and adds surcharge.
- The wall supports part of a house or garage foundation.
- Walls are tiered, with one wall stacked above another.
- The wall is close to a property line, a street or a neighbor’s structure.
- The soil is expansive clay, loose fill or saturated, or a soils report has flagged slope stability.
- The wall is part of a commercial, industrial or subdivision project.
Remember that walls with a significant drop on the high side also need a guard where people can walk along the top. The IRC and IBC require guards where a walking surface is more than 30 inches above the grade below, and we show the guard and its attachment on the drawings when one is needed.
How we design a retaining wall
Every retaining wall design starts with the soil. The pressure soil exerts on a wall depends on its unit weight, its friction angle and whether the wall can rotate slightly or must stay rigid. Where a geotechnical report exists, we use its recommended earth pressures and bearing values. Where one is not required, we use conservative values permitted by the code and state those assumptions on the drawings.
We then add the loads that act on top of the soil. A sloping backfill increases pressure significantly. A driveway, a parked truck or a nearby footing adds surcharge. In high seismic regions the code may require seismic earth pressure as well. If water can build up behind the wall, hydrostatic pressure can exceed the soil pressure itself, which is why drainage is part of the design rather than an afterthought.
With the loads defined, the wall is checked for:
- Overturning about the toe of the footing.
- Sliding along the base, often resisted with a shear key or a wider heel.
- Bearing pressure under the footing compared to the allowable soil capacity.
- Structural strength of the stem, footing and reinforcing to ACI 318 or TMS 402.
For segmental walls the checks also cover geogrid length, spacing and strength, block to grid connection capacity, and internal sliding between courses. Global stability of the slope as a whole is a geotechnical question, and on steep or tall sites we coordinate with your geotechnical engineer.
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- Free and no obligation
- Reviewed by a licensed PE
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Choosing the right retaining wall system
The right wall depends on height, access, appearance and the space available behind the wall for excavation.
Cantilevered concrete and masonry
These walls need a footing that extends back under the retained soil, but they use little space behind the face. They suit tall walls, walls that also support a structure, and sites where the wall must be thin. They require formwork or block placement, rebar and inspections before the pour or grout.
Segmental retaining walls
Interlocking concrete blocks with geogrid reinforcement are popular because they install without formwork, flex slightly without cracking and look finished. The trade-off is space: the geogrid must extend back into the backfill, often a distance comparable to a large share of the wall height, so the excavation is wider. They are a poor fit where a property line or building sits right behind the wall.
Soldier pile walls
When there is no room to excavate behind the wall, steel piles drilled or driven at intervals with lagging between them can retain a cut directly. They are common next to existing buildings and roads.
Timber and gravity walls
Treated timber, large gravity blocks and boulder walls work well at lower heights and for landscape terracing. They rely on mass and batter more than reinforcement, and their height limits are lower.
Drainage, tiered walls and walls near structures
Water is the main reason retaining walls fail. A wall designed for soil pressure alone can be overloaded when the backfill is saturated. Our drawings include a drainage system matched to the wall type: free-draining gravel behind the wall, a perforated drain pipe at the base outlet to daylight or a storm system, filter fabric to keep fines out of the gravel, and weep holes where appropriate. Surface water above the wall should be directed away with swales or grading, and we coordinate those with our grading and drainage plans when the site needs them.
Tiered walls need special attention. Unless the upper wall is set back far enough from the lower one, it acts as a surcharge and both walls must be designed together. We check that interaction and specify the setback or the combined design.
Walls that support a building, a garage slab or a pool require the building loads to be traced into the wall. When the wall is part of a house foundation, we design it alongside the rest of the foundation design so the footings, wall and floor framing work as one system. For walls near property lines, a site plan showing setbacks and drainage is often required with the permit, and we can prepare it in the same package.
You likely need this if
- The wall exceeds your city's exempt height
- A driveway or building is above the wall
- Walls are tiered or stepped
- The wall is near a property line
- The soil is clay, fill or wet
- The wall supports a structure
How it works, start to finish
From your first message to stamped drawings, you work directly with the engineering team.
- 1Share your projectSend the address, scope and any drawings, photos or plan-check comments. Two minutes is enough.
- 2Receive a fixed-fee proposalAn engineer reviews the scope and replies with a firm price and delivery date for your retaining wall design drawings.
- 3Engineering and draftingWe run the calculations and prepare drawings to the codes your jurisdiction enforces, checked before sealing.
- 4Stamped set deliveredYou receive a sealed PDF set ready to submit, and we answer any plan-check comments within scope.
Codes and standards for retaining walls
Retaining walls are designed to the codes your jurisdiction has adopted and the standards for each wall material:
- International Building Code (IBC) Chapter 18, Soils and Foundations
- International Residential Code (IRC) foundation provisions for residential walls
- ASCE 7 for surcharge, wind and seismic loads
- ACI 318 for reinforced concrete walls and footings
- TMS 402 for reinforced masonry walls
- NCMA Design Manual for Segmental Retaining Walls
How licensing works. Engineering drawings must be sealed by a Professional Engineer licensed in the state where your project is located. PE Engineer works with a network of state-licensed PEs, so every set is reviewed and stamped by an engineer with an active license in the state where your project is located. Their name and license number appear on the seal, exactly as your building department requires.
Related services
Foundation DesignFootings, slabs, stem walls, piers and pile foundations designed and PE stamped for your soil, loads and local code.Explore More
Grading & Drainage PlansEngineered grading and drainage plans for new homes, additions, ADUs, manufactured homes and commercial pads, prepared to local ordinances and PE stamped.Explore More
Site & Plot PlansScaled site and plot plans showing property lines, setbacks, easements, lot coverage, utilities and drainage for residential and commercial permits.Explore MoreFrequently asked questions
How tall can a retaining wall be without an engineer?
It depends on your jurisdiction. Many follow a threshold of 4 feet measured from the bottom of the footing to the top of the wall, provided the wall carries no surcharge such as a driveway or building. Some cities set lower limits or require engineering for any wall near a property line. We can check the rule for your address.
Do I need a soils report for my retaining wall?
Not always. Many residential walls can be designed with conservative code values. A geotechnical report is often required for tall walls, walls on steep slopes, walls retaining fill or expansive clay, and commercial projects. When a report exists, we design directly to its earth pressures and bearing values.
Can you design a segmental block wall using a specific block system?
Yes. We design segmental walls using the tested connection strength and interface values published for the block system your contractor plans to use, and specify the geogrid type, length and spacing for each course. Tell us the block product early so the design matches what will be installed.
Why do retaining walls lean or crack?
The most common causes are poor drainage that lets water pressure build behind the wall, a footing that is too small or too shallow, missing reinforcing, and surcharge loads the wall was never designed for. A failing wall can often be repaired with tiebacks, a new wall in front or drainage improvements, which we can design.
Can a retaining wall be built on the property line?
Often, but local zoning, easements and neighbor agreements control that, and the footing or geogrid usually extends beyond the face of the wall. We design the wall to stay within your property where possible, such as with a footing that projects only toward the front of the wall or a soldier pile system, and show it on the site plan.
What information do you need to design my wall?
The address, the wall location and length, the height along its length, what sits above and below the wall, photos of the site and any soils report. A topographic survey helps on sloped sites. With that we can quote a fixed fee, usually the same day.
Get your free retaining wall design proposal
Tell us where the project is and what you need. Attach any drawings, photos or plan-check comments. A licensed engineer reviews every request.
- Upload your filesPlans, sketches, photos or comments
- Get a fixed-fee proposalUsually the same day
- Receive stamped drawingsSealed by a PE licensed in your state