Adjusting steel to fit exact site conditions
Steel adjusted on site to fit the structure properly, where issues only become clear once everything is in place.
Used for exact site conditions
6,355+
MAH STEEL / SERVICES / ONSITE FABRICATION
Onsite steel fabrication in London and Kent.
Onsite fabrication and welding across Kent, London and the South East, for adjustments, repairs and last-minute changes once steel is on site, worked from your engineer's drawings or measurements.
- Onsite work
- Adjustments, repairs and changes
- Worked from
- Engineer's drawings or measurements
- Equipment
- Mobile welding, cutting and drilling
- Used for
- Lofts, extensions and alterations
- Coverage
- London, Kent and the South East
Steel adjusted
where it already sits.
Onsite fabrication is a practical way to deal with steel once it is on site. At MAH Steel, we provide onsite fabrication and welding across Kent, London and the South East, helping keep projects moving when adjustments, repairs or last-minute changes are needed.
Not every job goes exactly to plan. Sometimes steel needs to be adjusted on site to fit the structure properly, or issues only become clear once everything is in place. Instead of sending materials back to a workshop, we come to you.
We work directly from your engineer's drawings or measurements, making sure everything fits as it should and performs correctly once installed. Steel that is better made in the workshop comes from our structural steel fabrication service in Gravesend.
To carry out this work safely and efficiently, our team arrives fully equipped with professional onsite tools, including:
- Mobile welding equipment
- Cutting and drilling tools
- Site-ready fabrication equipment
- Lifting and handling support where required
What we adjust
and repair on site.
Our onsite fabrication service is commonly used for:
Remedial steelwork and repairs
Carrying out remedial steelwork and repairs, and fixing issues from previous suppliers, on steel where it already sits.
Used for repairs and corrections on site
Modifications to beams and connections
Making modifications to beams and connections on site, worked from your engineer's drawings or measurements.
Used for beams and connections
Loft conversions, extensions and structural alterations
Supporting loft conversions, extensions and structural alterations on projects of all sizes.
Used for loft conversions, extensions and alterations
Onsite tools
and how we work.
What to expect when steel is worked on where it already sits.
Professional onsite tools
Working from your drawings
We work directly from your engineer's drawings or measurements, making sure everything fits as it should and performs correctly once installed. Send the drawings or measurements with photographs of the steel, and tell us about access and where the work is.
Less transport, less handling
Onsite fabrication also helps reduce costs and downtime. By completing work where the steel is already located, we avoid extra transport, reduce handling risks, and keep your project moving without unnecessary delays.
Workshop or onsite?
Most steel is still prepared in the workshop, with onsite work used for specific modifications, repairs, adjustments or installations. Where a change affects the structural design, it may need to be reviewed by the engineer or design team before work goes ahead. Read our guide, onsite steel fabrication: how it works and when it's needed.
Lofts, extensions and alterations
We regularly help builders and contractors resolve unexpected issues, whether it's a small adjustment or more complex remedial steelwork. That includes work on loft conversions, extensions and structural alterations.
Where we work
We provide onsite fabrication across Kent, London, Essex, Surrey and Sussex, supporting projects of all sizes with practical, reliable solutions. See all our service areas.
From site issue to finished adjustment.
Onsite work starts with understanding the issue and the drawings. Which steps apply depends on the steel, the site and what has been agreed with MAH.
Review
Send the engineer's drawings or measurements, with photographs of the steel that needs work.
Agree
Agree the adjustment, repair or modification and what the job needs on site.
Attend
Our team arrives with the onsite tools the job needs and carries out the work.
Check
Check the finished work against the drawings or measurements, so everything fits as it should.
Onsite work is one part
of the job.
Onsite fabrication sits alongside welding, erection, fabrication, drilling and cutting, each with its own service page.
Steel weldingMIG, TIG and gas welding for structural steelwork, railings, gates and repairs.
Steel erectionFrom single beam placements to full structural frameworks, installed on site.
Structural steel fabricationBeams, plates, cranked members and frames made to approved drawings.
Steel beam drillingBolt holes, plate and cleat holes, drilled in the workshop and on site.
CNC steel profilingCNC profiling and laser cutting of plates and sections, for fabrication-ready steel.
On site on real MAH projects.
Published MAH case studies where our own team fitted the steel on site, with the actual locations and links to the work.
Putney High Street
Steel for an extension to an existing building on Putney High Street, erected by our own installation team.
Structural Fabrication
Crane Hire
Welding
Hundred of Hoo Academy, Kent
Steel designed, fabricated and installed by our install team at Hundred of Hoo Academy, through high winds, rain and snow.
Structural Fabrication
Cutting
Welding
Ashford, Kent TN25
A surveyed steel frame erected beside existing buildings by our own erection team, with a 22m HIAB lorry and a boom lift.
Site survey
Tekla detailing
Fabrication
Guides to onsite steelwork.
How onsite fabrication works, what to check before steel reaches site and how problems with steelwork are put right.
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Onsite fabrication questions and answers.
Onsite fabrication is often used when projects require flexibility, precision adjustments, or reduced transportation of large steel components. This section explains how our onsite fabrication services operate, covering typical processes, site setup, safety considerations, and how in-situ work supports accurate installation and efficient project delivery.
When is onsite steel fabrication necessary?
Onsite steel fabrication is necessary when structural steel components cannot be fully manufactured off-site due to access limitations, complex site conditions, or when final adjustments are required during installation. It is often used for tight access projects, structural modifications, or when precise fitting is needed on existing structures.
What types of steelwork can be fabricated on site?
We carry out a range of onsite fabrication work including cutting, welding, drilling, and adjustments to structural steel beams, columns, and connections. This allows us to adapt steelwork directly on site to ensure a precise fit where conditions may differ from initial drawings.
Why is onsite fabrication used instead of workshop fabrication?
Onsite fabrication is used when steelwork requires final adjustments or when transporting fully fabricated components is not practical. It allows flexibility during installation, ensuring structural steel fits accurately within existing buildings, extensions, or restricted-access environments.
What do you need to price onsite work?
Send your engineer's drawings or measurements, photographs of the steel and the site, the site location, and a description of what needs adjusting or repairing. Tell us about access and anything else on site that affects the work.
Does steel on your site need work?
Send MAH your engineer's drawings or measurements, photographs and the site location. We can advise on the onsite work and on any related fabrication, delivery or installation, and quote for it all together.
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