Retaining Wall Structural Engineering
Engineered Retaining Walls You Can Build With Confidence
Timberline Structural Engineering provides professional retaining wall engineering for residential and small commercial projects. We work with homeowners, contractors, landscape designers, and architects to deliver safe, durable, and permit-ready retaining wall designs that meet local code and site requirements.
Whether your project is driven by grading constraints, erosion control, or site development needs, we provide practical engineering solutions that are tailored to your property and construction method.
When Is Structural Engineering Required for a Retaining Wall?
Many retaining walls exceed prescriptive limits or are subject to site conditions that require engineered design, including:
Wall height exceeding local prescriptive limits
Surcharge loads from driveways, buildings, or slopes
Poor or variable soil conditions
Sloped or tiered retaining wall systems
Walls supporting structures or property lines
Seismic, snow, or high groundwater considerations
Timberline Structural Engineering evaluates these factors early to help avoid permitting delays or costly redesigns.
Retaining Wall Types We Engineer
We provide structural engineering for a wide range of retaining wall systems, including:
Cast-in-place concrete retaining walls
Gravity walls including segmental retaining walls by Allan Block (or other manufacturers)
Rockery and boulder retaining walls
Masonry retaining walls
Timber retaining walls (where permitted)
Our designs are based on site conditions, wall geometry, loading, drainage, geotechnical recommendations, and constructability.
Designed for Site Conditions & Local Codes
Retaining walls are highly site-specific. We account for critical design factors such as:
Soil properties and backfill conditions
Groundwater and drainage requirements
Seismic forces
Geotechnical design parameters
Frost depth and local climate conditions
Surcharge loads from fences, buildings, adjacent walls, roads/driveways
Because Timberline Structural Engineering is licensed across multiple states, we understand how local building departments and jurisdictions interpret retaining wall requirements, helping streamline review and approval.
Support for Homeowners
If you’re a homeowner, retaining wall requirements can feel confusing or overwhelming. We help by:
Explaining when engineering is required
Clarifying what the building department needs
Providing clear, stamped calculations and plans
Coordinating with your contractor or designer
Whether your project involves grading, a new driveway, a backyard wall, or a hillside property, we help take the guesswork out of the process.
Support for Contractors, Designers & Architects
At Timberline Structural Engineering, we provide clear, buildable retaining wall designs that reduce RFIs and prevent field issues.
Permit-Ready. Built for the Field.
Our retaining wall services include:
Identifying and designing for surcharge loads
Retaining wall design and calculations
Retaining wall detail, schedule for varying heights, structural notes
Code-compliant design
Clearly detailed for contractors
Construction observation
Support Through Construction
We stay involved during permitting and construction to answer questions, assist with coordination, and provide construction observation when needed.
Because strong engineering does not stop at design. It supports the build.