Design Services
Geotechnical design focused on performance and buildability.
We deliver tailored foundation solutions that balance performance, cost, and constructability. Whether it’s shallow footings, rafts, or deep piled systems, our designs are grounded in rigorous geotechnical analysis and local experience. We assess soil-structure interaction, settlement behaviour, and bearing capacity to ensure safe and efficient support for all types of structures—from residential buildings to complex infrastructure.
Our portfolio includes piled-raft foundations for high-rise developments, where we’ve optimised load sharing between piles and raft slabs to reduce pile lengths and construction costs. We’ve designed pile-supported rafts for multi-storey buildings with complex load paths, ensuring minimal differential settlement even under heavy column loads. For sites with deep competent strata, we engineer large-diameter bored piles to safely transfer loads through challenging ground profiles, including interbedded sands and limestone.
Our solutions are always tailored to the site’s geology, structural demands, and construction constraints—delivering robust, buildable foundations that perform reliably over time.
Opifex specialise in the design of retaining structures, supporting deep excavations and complex site constraints. Our expertise spans both embedded walls and gravity retaining walls, including contiguous, secant pile walls, sheet pile walls, king post walls, diaphragm walls and grout block walls.
Our designs are developed to meet both temporary and permanent project specifications, with safety, efficiency, and constructability consistently upheld as core standards.
Our team’s expertise in retaining wall design is complemented by a strong in-house capability to develop, and design tailored internal propping systems and specify a range of ground anchor solutions tailored to suit project demands. Our expertise helped to deliver major infrastructure projects—including rail corridors and complex urban sites.
Opifex designs are carried out in accordance with the governing Australian Standards, and where guidance is limited, we supplement our design with Eurocode 7 methodologies to ensure robust, safe and transparent design outcomes. Our approach includes staged excavation modelling, deflection control, and long-term serviceability assessments. Whether supporting basements, tunnels, or waterfront structures, our retaining wall solutions are safe, buildable, and performance driven.
Opifex offers clients a comprehensive range of advanced ground improvement solutions to enable construction on challenging or marginally suitable sites. These services include stone columns, rigid inclusions, preloading, and soft soil replacement techniques. Our engineering designs are informed by thorough site investigations and advanced laboratory testing, ensuring each solution is precisely tailored to meet both geotechnical and environmental requirements.
Opifex engineers provide end-to-end support for geotechnical temporary works, ensuring safe, practical and buildable solutions that align with construction sequencing and permanent works. Opifex designs and certifies a wide range of temporary systems including piling platforms, crane pads and shoring boxes.
Beyond design, we offer construction-phase supervision including site inspections, construction guidance, and real-time design adjustments to suit evolving site conditions. Our team understands the fast-paced nature of construction and works closely with contractors to deliver solutions that are not only technically sound but also practical to build.
Projects
Browse some of our recent Design Services work.
Ora Sorrento
Retaining Wall Design
Bunbury - Aged Care Centre
Geotechnical Investigation, Soil Improvement / Pre-Loading, Earthworks Verification
Nangetty Walkway Bridge
Foundation Pile Design
Kardinya Shopping Centre
Retaining Wall Design