White Rose Laboratory Services

White Rose Laboratory Services Ltd is an independent construction materials testing laboratory providing both field and laboratory-based testing services to the construction and quarrying industries across the United Kingdom. Founded over a decade ago and headquartered in Castleford, West Yorkshire, the company has grown significantly from its origins as a regional quarry support service into a nationally recognised provider of materials testing and technical support. The core mission of the business remains the delivery of impartial, professional testing alongside genuine technical advice from a qualified team of Materials Engineers — not simply the supply of test certificates.

The laboratory's core capability centres on aggregate and quarry product testing, including particle size distribution (grading) analysis to BS EN 933, Los Angeles aggregate value determination, Micro Deval abrasion testing, and magnesium sulphate soundness evaluation. These tests characterise the mechanical durability and resistance properties of crushed rock, gravel, sand, and other granular materials used in road construction, drainage, fill, and structural applications. Results inform compliance with product performance specifications under the suite of BS EN aggregate standards.

Soil and earthworks testing forms an equally important part of the service portfolio. The laboratory performs soil classification to BS 1377, determination of moisture condition value (MCV), maximum dry density and optimum moisture content (Proctor compaction), remoulded California Bearing Ratio (CBR) testing in both soaked and unsoaked conditions, and plasticity index determination. These analyses directly support earthworks acceptance criteria on major infrastructure, housing, and civil engineering projects, guiding the specification of fill materials, subgrade improvement, and ground stabilisation schemes.

Concrete testing is a further key discipline. The Castleford laboratory undertakes compressive strength testing of concrete cubes, providing quality assurance data for structural concrete elements throughout the construction process. Field technicians support fresh concrete evaluation on site, conducting slump and workability assessments, air content measurement, and the manufacture of cube specimens for subsequent laboratory testing, ensuring that placed concrete conforms to the mix design and project specification.

White Rose operates a substantial field testing capability alongside its laboratory services. Site technicians carry out aggregate and earthworks sampling, in-situ CBR assessments, hand shear vane testing, in-situ density measurements using nuclear density meters (NDM), core cutters, and sand replacement methods, lightweight deflectometer (LWD) testing, dynamic cone penetrometer (DCP) profiling, plate load testing, and degree of pulverisation analysis for lime or cement ground stabilisation works. This integrated combination of laboratory and field services allows White Rose to support projects from pre-construction ground characterisation through to in-process quality control and completion verification.

White Rose Laboratory Services holds UKAS accreditation as a testing laboratory under registration number 8950, confirming compliance with the international standard ISO/IEC 17025 for the competence of testing and calibration laboratories. UKAS accreditation is the recognised benchmark for laboratory quality in the UK, providing clients assurance that test methods are properly validated, equipment is calibrated to traceable standards, staff competence is independently assessed, and reported results are defensible in technical and contractual contexts. The UKAS schedule covers the aggregate, soil, and concrete tests central to the company's commercial offering.

The company operates from two permanent sites. The primary laboratory and head office are located at Lumley Street, Castleford, West Yorkshire (WF10 5LB). A Midlands Operations Hub is established in Coalville, Leicestershire, providing regional coverage for projects across the East and West Midlands; project-specific laboratory facilities have also been deployed at Shawell, Leicestershire to support major long-running earthworks contracts. Together these locations underpin genuine nationwide reach with responsive field mobilisation and fast laboratory turnaround.

For construction contractors, civil engineers, quarry operators, earthworks subcontractors, and concrete producers seeking reliable UKAS-accredited materials testing backed by qualified Materials Engineers, White Rose Laboratory Services offers a distinctive combination of technical depth, independence, and geographic coverage. Its sustained growth over more than eleven years reflects the confidence of major earthworks, aggregate, and concrete supply-chain clients in its results, and its status as a third-party independent laboratory ensures that test certificates carry the credibility and defensibility required for regulatory compliance, employer's requirements, and contractual quality assurance.