Structural steel for basement conversions, made to your engineer's drawings, in bolt-together sections where access is restricted. Help for builders and homeowners, with delivery planned around your site.
Basement steel is one of the most challenging elements of any build, often requiring bespoke structural steel fabrication and careful planning due to restricted access and complex load conditions. At MAH Steel, we supply and fabricate structural steel for basement conversions across London, Kent and the South East, ensuring every component is engineered for both performance and installability.
Tight access is a common issue on basement projects. That's why we manufacture steel beams in sections where required, using splice connections that can be bolted together on site. This allows large structural members to be installed safely and efficiently, even where full-length beams cannot be delivered.
We supply a full range of structural steel for basement conversions, including I-beams and columns, tailored to handle heavy load transfer and complex structural requirements. All steel is fabricated to your engineer's drawings, ensuring accuracy and a smooth installation process on site.
Basement work is technically demanding. MAH works with homeowners, self-builders, builders, developers, architects and trade contractors, and the questions they ask are different.
Send us your engineer's drawings, your programme and any access restrictions. We work from agreed drawings and specifications, with practical coordination before the steel reaches site, and plan delivery around the access you have.
Fabrication, coordination and delivery planning
Managing your own basement project? You can contact MAH with any questions. You do not need to know the technical terms: we can talk through what drawings are needed, what the fabrication involves and how the steel will reach your property, working alongside your builder and structural engineer. Send your drawings, or just outline what you are planning.
Plain English, not jargon
Basement steel varies with the property, the proposed layout and your structural engineer's design. We prepare the beams and fabricated details around the agreed requirements, rather than offering a one-size-fits-all package.
I-beams, columns and other structural steel members made to your engineer's drawings.
Suits heavy load transfer and complex structural requirements
Fabricated frames and support steelwork where walls are opened up or new openings are formed.
Suits larger window openings and light wells
Connection plates and drilled details cut, drilled, welded and finished in our Gravesend workshop.
Suits bolted joints and splice connections made to the approved drawings
Beams made in sections, with splice connections that bolt together on site, where a full-length beam cannot be delivered.
Suits tight access and limited working space
Tight access is common on basement projects, and narrow London streets and limited unloading space affect how steel arrives. MAH's own HIAB-equipped lorries give us options for lifting steel over buildings and into rear gardens, subject to site conditions and safe lifting requirements.
Our HIAB-equipped fleet is designed for difficult residential deliveries, making it easier to position steel into basements and confined sites without unnecessary handling or delays. This is a key advantage for contractors working in dense urban areas across London and the South East.
MAH's crane lorry options include up to 30m reach, as used on a 30m crane lift in Kensington on a tight London street with no direct access for traditional lifting equipment. Vehicle access, reach, loads and lifting arrangements are assessed for each job.
Tell us about narrow roads, tight turns, restricted access and the space for the lorry, and where the steel needs to end up. We plan delivery around the site and your programme.
Steel for basement conversions is usually installed in carefully planned stages because of limited access and working space, coordinated with the structural engineer and site team. See the questions below.
We work from engineer drawings and can also carry out site surveys where needed to confirm measurements and access.
We also supply steel beams for loft conversions and home extensions, giving you one reliable supplier for residential structural steel.
MAH can bring together the services that matter on a basement project, including fabrication, survey, modelling, delivery and erection. The exact scope depends on your drawings, programme and site conditions.
Structural steel fabricationFrom single beams to frames and fabricated steel packages.
Site surveyMeasurements and existing site conditions checked where required.
3D steel modellingDrawings and modelling to coordinate fabrication and connections.
HIAB crane deliveryOur own HIAB-equipped lorries deliver and position steel, even on tight or restricted access sites.
Steel erectionErection and installation support where agreed.
One practical sequence, with people on hand to answer questions. Your structural engineer's drawings guide the steel, and the stages depend on your project and the services agreed with MAH.
Send your drawings or job details, with your requirements, programme and access considerations.
A surveyor-draughtsman can visit site and measure up, or we can work from suitable drawings when a survey isn't needed.
You and your engineer approve the drawings before fabrication starts. The steel is then cut, drilled, welded and finished in our Gravesend workshop, in sections where access requires.
We plan delivery around the site and your programme, with our own HIAB-equipped lorries able to offload and lift steel where access permits.
One published MAH basement project, and two projects that show how MAH handles splice connections and difficult-access lifting.
A beam fabricated for a London basement renovation with a restricted working environment and limited access, spliced into three sections…
Two structural splices and shelving plates designed from sketches approved by the client, fabricated in the workshop and delivered by HIAB…
Structural steel beams and columns lifted by a 30m-reach crane lorry on a tight London street with no direct access for traditional…
Practical reading on steel for basement conversions, how steel reaches tight London streets and how crane lifts are planned for residential steel.
At MAH Steel, we've observed a growing trend among clients who aspire…
Delivering structural steel across London is rarely straightforward…
Most residential steel installations only take a few hours on site…
Steelwork is a key component in many basement conversion projects, providing the strength and flexibility needed to create safe and usable underground spaces. This section explores common questions about using steel in basement conversions, including structural requirements, design considerations, installation challenges, and how steel solutions support effective space transformation below ground level.
Basement conversions typically use structural steel beams, columns, and frame support systems designed to handle high loads and restricted working conditions. The steel is selected based on engineer calculations to safely support existing structures while allowing new underground space to be created or reinforced.
Steel for basement conversions is usually installed in carefully planned stages due to limited access and working space. This often involves temporary supports, precise lifting methods, and sectional installation of beams and frames, all coordinated with the structural engineer and site team.
Yes, we fabricate bespoke structural steel for basement conversions and underpinning projects. Each piece is manufactured to exact specifications to suit confined spaces, complex load requirements, and site-specific conditions, ensuring safe integration with the existing structure.
Yes. MAH supplies and fabricates structural steel for basement conversions across London, Kent and the South East, made to your engineer's drawings. Contact us with your drawings and details of access to discuss your requirements.
Yes. Tight access is a common issue on basement projects, so we manufacture steel beams in sections where required, using splice connections that can be bolted together on site. This allows large structural members to be installed even where full-length beams cannot be delivered.
Send the details you have. For fabrication and delivery, MAH requires structural engineer General Arrangement (GA) drawings with measurements, so that no key dimensions or details have to be assumed, and the drawings are approved before fabrication starts. If you are still working out what you need, outline the project and the team can talk it through.
MAH's HIAB-equipped fleet is designed for difficult residential deliveries, making it easier to position steel into basements and confined sites, with crane options up to 30m reach. Lifting is subject to site conditions and safe lifting requirements, and vehicle access, reach, loads and lifting arrangements are assessed for each job.
Yes. MAH works with homeowners, self-builders, builders, developers, architects and trade contractors. You do not need to know all the technical terminology before making an enquiry: the team can talk through the fabrication requirements, what to send and how the steel will reach your property, working alongside your builder and engineer.
Send your engineer's drawings and details of the access, or call if you need advice about steel, delivery or access. Builders and self-builders welcome.
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