steel reinforcement structure for the basement construction made by steelwork contractors London



Underpinning foundations London’s many historic buildings is a common task for us here at Alexson Structural & Groundworks Ltd. The aged buildings are often in need of structural support as they suffer from subsidence or poor soil qualities.

Specialist underpinning contractors London didn’t exist several hundred years ago. The buildings, therefore, have often been built on poor foundations. All too frequently, the land had been re-used and not professionally prepared for another structure.

With the repurposing of many buildings across the capital, we’re often called upon to perform mass concrete underpinning or underpinning basements to support increased usage and load.




London is awash with majestic,historic buildings, and our company remains a pioneer when it comes to underpinning foundations across the capital. Alexson Structural & Groundworks Ltd. are proud custodians of an underpinning company in London that has a reputation as solid as the underpinning foundations we deliver.

From historic buildings in need of structural support due to subsidence or poor soil qualities, to new buildings needing underpinning foundations, London’s landscape showcases our techniques and delivers quality work to clients.

Historically, specialist underpinning contractors in London are relatively new, meaning many buildings were built on poor foundations. Forward to today, and our experts are underpinning London properties, and saving structures from decay and dereliction.

With a multitude of buildings across the capital in need of work, Alexson is equipped and experienced, ready to deliver mass concrete underpinning or underpinning basements to support increased usage.


Does your Property Need to be Underpinned? Here’s What to Do

exampe of structural-steelwork-London

When it comes to underpinning work and underpinning foundations in London properties, the first and most important step is to speak to a qualified chartered surveyor and have your property inspected by a structural engineer.
After the inspection, the report will be able to identify any structural issues which will then determine if your property needs to be, or has previously been underpinned, which can then help you get professionals on the job for our underpinning needs in London.
For properties that are structurally unsafe and in need of underpinning London, our team is on hand to offer professional advice and expertise, giving clients peace of mind.
For underpinning foundations in London properties there are many methods used in the industry, but the way to avoid serious damage of potential collapse is to have all your underpinning in London done by professionals, so contact Alexson today.

Alexson – The best Underpinning London Choose our Underpinning Company for your building!

Underpinning Foundations

When it comes to underpinning London, our reputation is as solid as our foundations. Alexson offers professional expertise and cost-effective solutions for all your underpinning foundations needs in London.

Whether it’s a large corporate office building, or a smaller residential property, our underpinning foundations will be done to the highest industry standards, and delivered by our accredited underpinning tradesmen across London.

As an underpinning company in London with years of experience, and a portfolio of projects, we offer peace of mind as well as underpinning services for all London properties.

Call us to get your underpinning in London started.

Underpinning Basement

Creating a great space starts with the integrity of the underpinning foundations that any basement requires. When it comes to structural integrity and safety standards, Alexson offers the highest quality work for all underpinning basement work in London.

With a wealth of experience to build on, we work closely with clients to design the best underpinning solution for their basement requirements, ensuring that any underpinning foundations in London provide the perfect platform for that superior basement space.

Offering time and cost-efficient underpinning in London, our basement work is guaranteed to deliver results you need at a price you can afford.

Underpinning Company

When you need an underpinning company in London, look no further than Alexson. Our proven track record, and experience of delivering underpinning foundations in London make us the underpinning company in London that you can trust.

Offering cost and time effective solutions, our experienced tradesmen have worked on underpinning in London that spans building projects from small to full scale, focusing bespoke on solutions for each one.

Whether it’s underpinning for a basement in a London home, to large scale corporate building underpinning in London, we are here to help, with our guarantee that gives peace of mind, every time.

Our Safety Procedures During Uderpinning Basement in London and Underpinning Foundations in London

proud worker of groundwork companies LondonIn addition, Alexsons ensures the following to underpinning clients in London:

Our underpinning team in London will conduct a full inspection before excavation

Our underpinning experts will evaluate soil and foundation depths to decide the most effective underpinning method

When it comes to finding a professional underpinning company in London that puts safety first, Alexson is the company to call with the team to trust. For all our construction projects, including all our underpinning foundations projects we know how important and critical it is to be prepared for any eventuality. When underpinning in London, it is essential.

Put simply, underpinning foundations in London is done under the ground a building stands on, ultimately affecting the chances of collapse, plumbing accidents or further damage, all things an underpinning company needs to take into account.

At Alexson Structural and Groundwork,  we guarantee that all our underpinning work in London adheres to all CDM (Construction Design and Management) regulations, without exception.

Our underpinning team in London will Inspect pits for any potential instability and conduct a general ground assessment

Plan and enforce health and safety policies in all underpinning procedures

All our underpinning foundations work will be done by our highly qualified personnel for each underpinning London project

Why do Buildings Need Underpinning London? Read about Alexson’s Underpinning Foundations & Underpinning Basement

Underpinning London foundations is performed to strengthen the foundation and strengthen the building. This is often needed as a consequence of subsidence, which can happen when extra floors and extensions are carried out on the property. It can also be needed as a result of inadequate initial construction by the original underpinning company London.

If you are notified that underpinning of your home is needed, it’s usually because a form of subsidence is causing your home to sink into the ground. This typically occurs because the soil from beneath your property has shrunk or moved. Or, it can happen because originally when the original foundations were laid, the ground was incorrectly assessed before the groundworks were made.

Typically, subsidence occurs more in semi and detached houses, but any building can be affected. Even mid-terraces, if they have been built over old river beds. This is something that can be checked by a structural survey, before purchase. Some underpinning foundations have been performed because a survey carried out when they purchased their property, hadn’t seen that the neighbour to the semi-detached property has also been underpinned.

If you are considering buying a house in the southeast of England, clay soil is abundant, knock on the doors of nearby houses where you are thinking of locating to,  and ask if their properties have been underpinned and If there has been a problem with subsidence.

At Alexson, we are renowned for our extensive industrial experience and construction knowledge and for being a reliable, skilled underpinning company London based. We know that potential subsidence can be indicated by cracks in the brickwork or render and also blown tiling on the inside walls.

When it comes to doing underpinning work on your London property, keep in mind that there are several things that can cause blown tiles, including leaking pipes, so their presence should ring alarm bells – they mean something, somewhere is wrong. For more information about underpinning London, contact Alexson. For all these issues, we are an underpinning company working with London clients to provide structural integrity and solid foundations, and we know the importance of this work.

Underpinning London Methods by best Underpinning Company

worker of groundwork companies london breaking concrete pile

Mass Concrete Underpinning Method (Pit Method)

One of the most common underpinning methods used by underpinning companies London based is the pit method, also known as the mass concrete underpinning method. This is a cost-effective method, suitable for shallow foundations, it is a traditional method that has been used for centuries. The existing foundation is extended until it meets a stable stratum. Following this the soil beneath the foundation is then excavated in stages and finally, the excavation is filled with concrete.

Underpinning By Cantilever Needle Beam Method

This underpinning method is an extension of the pit method. It can only be used if the foundation has to be extended on one side only and the plan possesses a stronger interior column. This method is faster compared to the pit method and has a higher load-carrying capability.

drilling into the ground with groundwork companies London

Mini Piled Underpinning

This underpinning method is used when the loads from the foundation have to be transferred to a distance greater than 5m from the excavation site. It can also be adapted for soil with a variable nature.  Steel case piles are driven into the ground with diameters of 150-300mm. A disadvantage to this method is that access is restrictive and it causes environmental pollution problems.

Pile Method of Underpinning

Settlement in soil due to water clogging or a clay soil nature can be treated using this method. Piles are driven into adjacent sides of the wall that is supporting the foundation. A needle, or pin, is then penetrated through the wall and acts like pile caps.

Pier and Beam Underpinning Method

This method is also known as the base and beam method, it began to be used following the second world war. The traditional mass concrete method couldn’t work for a large depth foundation, so a different method had to be implemented. This method is used and found economical on foundations up to 6m depth. It can be utilised in most ground conditions. Reinforced concrete beams transfer the load to mass concrete bases, also known as piers. The size and depth of the beams depend upon the ground conditions and the loads involved.

Making foundation with underpinning London