Steel designed right. Steel fabricated right. Steel standing strong.

Steel is one of the most versatile structural materials available to Nigerian engineers, offering high strength, speed of construction, long spans, and the ability to be dismantled and relocated. However, structural steel is only as good as the engineering that designs it and the quality control that governs its fabrication.

Masterstone Engineering Ltd. provides end-to-end structural steel services, from structural design and connection detailing to fabrication oversight and erection inspection, ensuring that every steel structure we are associated with meets international quality standards and performs safely throughout its intended service life.

Our Steel Structure Services

Structural Steel Design

We design structural steel elements and systems using Eurocode 3 (EC3) and BS 5950, covering member sizing, connection design, stability analysis, and serviceability checks. Our steel designs are optimised for material efficiency and constructability, reducing waste and cost.

Steel Connection Design & Detailing

Connection design is one of the most critical and often underestimated aspects of structural steel engineering. We design bolted and welded connections (moment connections, simple shear connections, base plates, and splice connections) with full calculation packages and fabrication drawings.

Fabrication Drawing Production

We produce detailed shop drawings (fabrication drawings) that the steel fabricator uses to cut, drill, and weld individual steel members. Our shop drawings include full member dimensions, hole patterns, weld specifications, and surface treatment requirements.

Fabrication Quality Oversight

We provide inspection services during steel fabrication, visiting the fabrication shop to verify material certification, dimensional accuracy, weld quality, and surface preparation before steel elements leave for site. This is a critical quality assurance step that prevents costly errors being discovered only during erection.

Site Erection Inspection

We inspect steel erection on site, verifying that members are erected plumb and level, that bolts are tightened to the specified torque, and that site welds meet quality requirements before the frame is loaded.

Steel Structure Types We Design & Oversee

• Portal frame industrial buildings: warehouses, factories, agricultural stores
• Multi-storey steel-framed buildings
• Steel trusses: roof trusses, crane girder trusses, long-span trusses
• Mezzanine floors in warehouses, retail units, and office buildings
• Steel staircases, walkways, and access platforms
• Steel pergolas, canopies, and shade structures
• Crane gantry structures and monorail beams
• Steel bridges and footbridges
• Steel Billboard and signage support structures

Steel Grades & Standards

• Design to Eurocode 3 (EN 1993) and BS 5950
• Steel grades: S275, S355 (EN 10025) and equivalent ASTM grades
• Weld inspection to BS EN ISO 5817
• Surface treatment: hot-dip galvanising, paint systems to BS EN ISO 12944

Bolts: Grade 8.8 and 10.9 structural bolts to EN 14399