Structural Steel Fabrication and Installation

Structural Steel Fabrication Services

We deliver end to end structural steel fabrication for commercial, agricultural, and residential projects across the South East, combining precise workshop production with coordinated on site steelwork, fitting, and steel erection.

Whether you need RSJ installation for a residential opening, full frames for a warehouse, or bespoke stair structures and mezzanines, our team builds accuracy into every stage. We work to your drawings or develop a bespoke design and complete welded and bolted connections as specified. If you’d like to discuss your project, contact us to get a free quote.

Why Choose Us For Structural Steelwork

Certainty matters. Every beam, column, and connection must install first time and meet the engineering specification. We focus on buildability, predictable delivery, and clear communication so your programme stays on track.

Technical Capability

We fabricate universal beams, universal columns, RSJs, and complex assemblies with tight tolerances. Controlled cutting, drilling, welding, and fit up ensure components align on site, reducing crane time and rework. Labelling and setting out marks support efficient erection.

Design Collaboration

We fabricate to drawing and can assist with bespoke design, connection details, and buildability reviews. Early coordination helps avoid clashes with services, masonry, and floor build ups. Where details can be simplified, we propose practical alternatives that maintain performance while speeding installation.

On Site Delivery

Our on site steelwork covers setting out, lifting plans where required, fitting and bolting, and certified on site welding. We coordinate deliveries, cranage, and sequencing with your site team to minimise disruption. Method statements and risk assessments are provided as appropriate.

Compliance and Quality

We use CE marked materials with full traceability. Welds and connections are completed to the engineer’s details, and quality checks verify dimensions, hole patterns, and finishes before despatch. On site, we follow safe systems of work for lifting and hot works.

Our Structural Steel Services

From RSJ installations and support frames to stair cores, mezzanines and full structural frames, we handle design collaboration, fabrication, coatings, logistics, cranage and on-site erection under one accountable team.

Beams, Columns, RSJs, and Support Frames

We fabricate and supply beams and columns in a range of profiles and sections, including RSJs for residential and refurbishment works. Support frames are built to drawing with cleats, end plates, base plates, stiffeners, and drilled holes to specification. Components are clearly labelled for straightforward erection.

Stair Structures, Mezzanines, Gantries, and Industrial Frames

We produce access structures including stair cores, mezzanine floors for storage or office space, plant gantries, and industrial frames for equipment. Treads, landings, balustrades, and loading requirements are delivered to the agreed specification. We coordinate interfaces to ensure a clean fit on site.

We recently designed and built a bespoke staircase for one of our clients. See the project for details and photos.

On Site Steelwork, Fitting, and Erection

Our team positions and levels steel, complete bolted connections, and undertakes on site welding where required. We align members, check levels, and finalise connections in line with the drawings, working safely around other trades and maintaining clear access routes.

Fabrication To Drawing Or Bespoke Design

We fabricate directly to architectural and structural drawings and can assist with bespoke design if details need refinement. If site conditions differ from the drawings, we raise a clear query, propose options, and keep the programme moving.

Welded and Bolted Connections

We deliver fully welded and bolted connections to suit your engineer’s design, including moment connections, end plates, fin plates, and splice joints. Heat input and sequence are controlled to minimise distortion. Fit up checks confirm performance before final welding or tightening.

Materials and Finishes

We can supply primed steel or enhanced coating systems as specified. Where a particular protective or aesthetic finish is needed, we coordinate surface preparation, application, and curing within the schedule.

Sectors We Serve With Structural Services 

Commercial Fabrication

We supply and erect frames for new build units, extensions, retail fit outs, and industrial warehouses. Packages can include main frames, secondary steel, platforms, and walkways. We understand access constraints and the coordination demands of busy sites.

Agricultural Steelwork

We fabricate robust steel frames for barns, machinery sheds, livestock housing, and covered storage. Practical connection details support quick installation and long service life in exposed environments.

Residential and Small Works

We deliver RSJ installation and beams for openings, loft conversions, and extensions. We offer prompt quoting, quick turnarounds, and tidy working practices on occupied sites, coordinating with builders and homeowners.

Our Delivery Process

Consultation and Planning

Send your drawings or scope. We review the scheme, confirm specifications, and identify constraints. Risks and assumptions are clarified early, and milestones are agreed.

Survey and Coordination

Where needed, we verify critical dimensions and bearing details before fabrication. We coordinate levels, slab edges, wall build ups, and temporary works with builders, engineers, and architects.

Fabrication and Quality Control

Once drawings and specifications are signed off, we cut, drill, weld, and assemble with controlled procedures and dimensional checks. Trial assemblies and fit up checks are performed where appropriate to support smooth installation on site.

Logistics and Delivery

We plan deliveries around access, storage, and crane availability. Components are labelled and packed for phased erection, reducing handling and saving time on site. Fixings and plates are included as specified.

On Site Erection and Welding

Our erectors assemble the frame, align members, complete bolted and welded connections, and set out to the agreed datum. Hot work permits and exclusion zones are managed in coordination with site management.

Handover and Documentation

On completion, we provide the agreed documentation, such as material certificates, coating data, and welding records where specified. Any post install adjustments are addressed promptly.

Request A Quote

We deliver structural steel fabrication and on-site welding across West Sussex, including Horsham. Ready to discuss your project? Call our office on 01403 823968, email info@alphawelding.co.uk.

FAQs About Structural Steel Fabrication and Installation

Can you work from our engineering drawings?

Yes. We primarily fabricate to drawing. Where dimensions or details are uncertain, we raise queries promptly or offer a site measure to confirm critical information.

Do you provide on site steel erection?

Yes. Our on site steelwork includes lifting coordination, fitting, bolting, alignment, and on site welding where required. We supply the fixings and plates needed to complete the frame.

What components do you fabricate?

Beams, columns, RSJs, support frames, stair structures, mezzanines, gantries, and industrial frames. We also supply secondary steel such as lintels, trimmers, and angle bracing as specified.

What finishes can you supply?

Primed steel or enhanced coatings to specification. We confirm coating system, required film thickness, and curing time within the programme.

How quickly can you quote and deliver?

Share drawings and target dates for a fast quote. Lead times depend on scope and finish. We provide a clear programme and regular updates.

Can you adapt if site conditions change?

Yes. If we encounter unexpected levels, obstructions, or variances, we propose practical solutions, agree changes, and keep installation moving with minimal impact.

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