Engineering Survey Services

Construction staking transfers design coordinates from drawings to the physical ground. When an engineer designs a road or building, the design exists as coordinates and elevations on paper or in CAD software. Construction staking means a surveyor goes to the site with GPS and total station equipment and marks the exact locations where construction should occur. For a road, we stake the centerline alignment, edge of pavement, slope limits, and drainage structures. For a building, we stake corner points, column grids, and foundation limits. Contractors use these stakes as physical guides to position their equipment and materials correctly.

An as-built survey documents what was actually constructed, as opposed to what was designed. Construction rarely matches design drawings perfectly. Ground conditions change, design modifications occur, and contractor execution varies slightly from plans. As-built surveys measure the final constructed positions and elevations of roads, buildings, pipelines, and other infrastructure. This documentation serves three purposes. First, it verifies the contractor built what was approved and supports payment certification. Second, it provides accurate records for future maintenance and repairs. Third, it creates a baseline for infrastructure asset management systems. For government projects, as-built surveys are typically required before final payment approval.

Control points are permanent reference markers with known coordinates and elevations tied to the Kenya national geodetic network. They serve as the foundation for all project measurements. Without control points, different survey crews might use different coordinate systems, making it impossible to relate their measurements. Control points enable consistent positioning throughout the project lifecycle from initial design surveys through construction staking to final as-built documentation. They also allow construction to stop and restart without losing positional reference. For road projects, control points typically placed every 200m to 500m along the alignment. For building sites, minimum four control points surrounding the construction area. All our control points reference CORS stations providing connection to international geodetic standards.

Accuracy depends on project requirements and survey method. For CORS-referenced RTK GNSS positioning, we routinely achieve 10mm horizontal and 15mm vertical accuracy. For total station measurements, precision work reaches 3mm to 5mm both horizontal and vertical. Road construction surveys following Kenya Road Design Manual 2025 require 10mm horizontal and 5mm vertical accuracy, which we consistently meet. Bridge foundations and structural elements often require higher accuracy, typically 5mm horizontal and 3mm vertical, achievable through careful total station work and network adjustments. Residential building layout is more tolerant, typically 20mm acceptable. We calibrate instruments regularly per ISO 17123 standards and perform independent checks to verify accuracy meets project specifications.

We provide survey deliverables in formats compatible with modern civil engineering software. CAD deliverables include DWG and DXF formats for AutoCAD Civil 3D. Three-dimensional alignment data provided as LandXML files compatible with Bentley OpenRoads, Trimble Business Center, and other design packages. Cross-section data formatted for direct import into road design software. Control network documentation includes coordinate lists, adjustment reports, and monument descriptions. As-built surveys delivered as marked-up design drawings showing deviations from plan. All projects include PDF reports with survey methodology, accuracy statements, and professional certification. For government projects, we follow agency-specific format requirements. Digital terrain models provided as TIN or gridded surfaces depending on client preference.

Yes, government infrastructure projects are a core part of our business. We have completed 30+ projects for Kenya Rural Roads Authority (KeRRA) and maintain long-term partnership with Kilifi County Government. Our firm holds NCA Category 6 and Category 7 certification required for government road and building contracts. We are registered with AGPO (Access to Government Procurement Opportunities) as a women-owned enterprise, qualifying for 30% preference in county and national government procurement. We understand government procurement procedures, comply with public project reporting requirements, and deliver survey documentation in formats required by KeRRA, KeNHA, county governments, and development partners. Our experience includes World Bank funded projects, African Development Bank projects, and county development fund initiatives.