How We Deliver Accuracy
Initial Site Checks & Control Establishment
Before any setting-out begins, our Engineers verify existing control stations using redundant observations and closed traverse techniques to confirm positional reliability.
When a new network is required, it’s established using least-squares adjustment, achieving the highest confidence intervals possible.
Depending on the project scope, control is established to either:
- Georeferenced Grid (e.g., OS National Grid) — for major infrastructure or multi-phase developments, ensuring national coordinate traceability; or
- Local Grid — for self-contained sites, maintaining datum continuity against benchmarks.
This rigorous process forms the geometric foundation for all downstream works.
Design Data Analysis & Model Coordination
We meticulously review Architectural, Structural, and MEP drawings, as well as CAD and BIM datasets (Revit, IFC, DWG).
Our Engineers extract precise coordinates and dimensional data directly from 2D and 3D models, enabling virtual clash detection before setting-out begins.
This proactive approach eliminates coordination errors and results in a Design Discrepancy Report for the design team – preventing construction delays and ensuring build accuracy from day one.
Precision Setting-Out
With verified control established, we deploy a modern fleet of advanced equipment, including:
Robotic Total Stations (Leica / Trimble) for single-engineer efficiency.
High-Precision GNSS (GPS/GLONASS) for large-scale or remote site control.
Digital Levels for accurate vertical datum transfer.
Our setting-out operations consistently achieve:
Primary control accuracy: ±3mm
Main structural element positioning: ±5mm
We handle everything from foundations and drainage to complex geometries, including:
Curved and raking structural features.
Precast concrete alignment.
Structural steel bolt grids and base plates.
Formwork and plumb verification on multi-storey structures.
Every point is logged with digital, time-stamped photographs and field data records, creating a transparent, auditable QA trail.
Ongoing Verification & As-Built Surveys
Our commitment to accuracy continues throughout the Construction phase.
Regular verification checks ensure ongoing alignment with design intent, while our As-Built Surveys deliver fully transparent reporting.
Our reports include digital overlays and colour-coded deviation maps (known as isopachytes), providing an instant, visual compliance audit against design tolerances – ideal for inclusion within project quality control records and handover documentation.
Why Choose SEP Engineers?
Experienced Professionals: All Engineers hold CSCS/SMSTS certifications and have a minimum of 5 years’ site experience.
Proven Capability: Site-vetted for high-risk environments including rail, nuclear, and airport projects.
Advanced Technology: Industry-leading robotic and GNSS systems for precise, efficient delivery.
Quality Assurance: Real-time data verification by our Training & Quality Manager and Technical Support Department, ensuring each dataset is validated before use.
Auditable Deliverables: Every setting-out operation is logged, photographed, and archived to support client QA and compliance processes.
When precision matters, SEP Engineers provide the certainty your project deserves.
Looking for Setting-out support?
Submit your enquiry below – we aim to respond within 1 hour (during business hours Monday to Friday)
Frequently Asked Questions
- Do you provide as-built surveys after setting out?
Yes. We offer detailed As-Built Surveys with color-coded deviation maps that visually show compliance against design tolerances — ideal for quality control and handover documentation.
- How accurate is SEP Engineers’ setting out service?
Our setting-out adheres to construction tolerances of ±3mm for primary control and ±5mm for structural elements, verified through rigorous QA checks and digital data logging.
- What equipment do SEP Engineers use for setting out?
We utilise a modern fleet including Leica and Trimble Robotic Total Stations, High-Precision GNSS (GPS/GLONASS) receivers, and Digital Levels, allowing single-engineer efficiency and millimetre-accurate results on every project.
- Which projects do you provide setting out services for?
We deliver setting-out services across commercial, residential, and infrastructure projects, including complex environments such as rail, nuclear, and airport sites.
