Foundations & Underpinning Company in Kent
Foundation Installation
Structures that settle unevenly, walls that crack, and doors that no longer close are all consequences of foundations that were not specified or installed correctly for the ground conditions beneath them. As a foundations and underpinning company in Kent, Fry Site Services carries out foundation installation for domestic extensions and new self-builds through to commercial and industrial developments.
We excavate and install strip foundations, pad foundations, and trench-fill foundations, working to the structural engineer’s specification and coordinating with building control at the required inspection stages. Where ground conditions require deeper or more engineered solutions, we adapt accordingly.
Kent’s ground conditions make foundation design particularly important. Shrinkable clay soils across the Weald and parts of the Medway Valley expand and contract with seasonal moisture changes, meaning foundations in these areas need to be taken to sufficient depth to sit below the zone of influence. Chalk and flint in areas like the North Downs present different challenges around bearing capacity and the risk of sub-surface features. Our team is experienced with these conditions and works to specifications that reflect what is actually in the ground.
Ground Beams, Pile Caps, and Structural Excavations
Beyond standard strip and trench-fill foundations, some projects require more complex foundation elements. Fry Site Services carries out the associated works that sit alongside piled foundation systems, including:
- Ground beams connecting pile heads and distributing structural loads across the foundation system
- Pile caps formed over individual or groups of piles to transfer column or wall loads into the piles below
- Structural excavations carried out to the dimensions and tolerances required by the structural engineer’s specification
- Foundation repairs to existing structures where the original foundation has deteriorated or been damaged
These elements require accurate excavation, correct formation preparation, and close coordination with the structural engineer and follow-on concrete works. Fry Site Services manages this as part of the overall foundation programme.
Underpinning
Underpinning is required when an existing building’s foundations are no longer providing adequate support. This can happen due to soil movement, increased loading from an extension or additional storey, deterioration of the original foundation material, or proximity to new excavation works nearby.
Subsidence is a particular concern in parts of Kent where shrinkable clay soils are prevalent. During dry summers, clay soils lose moisture and shrink, which can cause foundations to move and result in cracking to walls and structural elements. Underpinning stabilises the building by extending the foundation to a level where ground movement no longer affects it.
Fry Site Services carries out underpinning using methods appropriate to the site conditions and the nature of the problem:
- Mass concrete underpinning involves excavating beneath the existing foundation in controlled sections and filling with concrete to transfer the load to more stable ground. This is the most widely used method for properties where access is sufficient and ground conditions are suitable.
- Mini piling is used where access is restricted, loads are high, or ground conditions require foundations to be taken to greater depth. Piles are installed through or alongside the existing foundation to transfer load to a deeper, more stable stratum.
- Resin injection is a less invasive method suitable for certain ground conditions, where expanding resin is injected beneath the foundation to stabilise and lift the structure without significant excavation.
We carry out site assessments and work alongside structural engineers to determine which method is appropriate before any work begins.
Foundation Repairs
Not all foundation work involves new builds or underpinning. Existing foundations can deteriorate over time due to water ingress, ground movement, or inadequate original construction. Foundation repairs address localised damage or deterioration without requiring full underpinning of the structure.
Fry Site Services assesses the nature and extent of foundation deterioration, agrees a repair methodology with the structural engineer, and carries out the physical works to restore the foundation to an adequate condition. All repair work is documented and carried out in compliance with building regulations requirements.
Safety and Compliance
Foundation and underpinning work involves significant excavation close to existing structures, requiring careful planning and strict safety management. Fry Site Services follows CDM 2015 requirements throughout, producing method statements and risk assessments that reflect how the work will actually be carried out. This includes:
- Ground investigation and site assessment before work begins
- Monitoring of adjacent structures during underpinning sequences
- Safe working practices in confined and restricted excavations
- Coordination with structural engineers and building control throughout
No underpinning sequence is started without a thorough understanding of the ground conditions and the structural requirements of the building above.
Other Services
Foundations and underpinning is one part of a wider range of construction and groundworks services that Fry Site Services provides across Kent. We also carry out construction site clearances, drainage, drilling, excavation and groundworks, land preparation, landscaping, roadways and footpaths, and surfacing. Whether foundation work sits alongside another service on the same project or you need a separate contractor for a different phase, we can often cover both.
Commercial Foundations and Underpinning
Commercial projects require foundations that can carry the loads imposed by the structure above, whether that is a warehouse, office building, retail unit, or industrial facility. Inadequate foundations in a commercial setting have significant consequences for safety, compliance, and programme.
As a foundations and underpinning company in Kent working for commercial clients, Fry Site Services provides foundation solutions designed to meet structural engineering specifications and building regulations requirements. We coordinate with principal contractors and project managers to make sure foundation work fits within the wider programme. Our Constructionline Gold accreditation gives commercial clients confidence in our compliance standards.
Our commercial work also extends into South London, parts of East Sussex, and Essex. More detail on our commercial work is on our dedicated commercial page.
Residential Foundations and Underpinning
For residential clients, foundation and underpinning work can be one of the more stressful parts of a project. Whether it is discovering that a property has subsidence, needing deeper foundations than anticipated for a new extension, or building a new home and wanting the groundworks specified correctly, the stakes are real.
Fry Site Services works with homeowners, self-builders, and residential developers across Kent. We explain what we are doing and why, provide clear documentation throughout, and work to a schedule that reduces disruption where possible. All residential foundation and underpinning work is carried out in compliance with Part A of the Building Regulations and coordinated with building control inspections at the appropriate stages.
Why Choose Us As Your Foundations and Underpinning Company in Kent
Fry Site Services is a Constructionline Gold accredited foundations and underpinning company in Kent with experience across residential, commercial, and industrial projects throughout the county and into South London, East Sussex, and Essex. We cover the full range of foundation types and underpinning methods, including mass concrete underpinning, mini piling, resin injection, ground beams, pile caps, and foundation repairs, selecting the right approach based on ground conditions, structural requirements, and access constraints. Every project is carried out in compliance with Part A of the Building Regulations and CDM 2015, with full documentation provided. Foundation and underpinning work sits within our wider groundworks offer, which means excavation, drainage, and site preparation are managed by the same contractor rather than requiring separate coordination.
We Are Accredited
Frequently Asked Questions
What is the difference between foundations and underpinning?
Foundations are installed as part of a new build or extension to provide structural support from the outset. Underpinning is carried out on an existing building where the current foundations are no longer providing adequate support, typically due to ground movement, subsidence, or a change in loading.
What types of underpinning do you offer?
We offer mass concrete underpinning, mini piling, and resin injection. The right method depends on ground conditions, the nature of the problem, access constraints, and the structural engineer’s recommendation.
Do you carry out ground beams and pile caps?
Yes. We carry out the associated concrete foundation works that sit alongside piled foundation systems, including ground beams, pile caps, and structural excavations to the engineer’s specification.
How do I know if my building needs underpinning?
Common signs include diagonal cracking at door and window corners, doors and windows that stick or no longer close properly, and visible movement in walls or floors. A structural engineer should assess the building before any work is carried out. We work alongside structural engineers and advise on the appropriate method once an assessment has been completed.
Does Kent's ground affect the type of foundations needed?
Yes, significantly. Shrinkable clay soils across the Weald and Medway Valley require foundations to be taken to greater depth to avoid the effects of seasonal soil movement. Chalk and flint areas like the North Downs present different challenges around bearing capacity and sub-surface features. We assess ground conditions on every project and work to specifications that reflect what is actually there.
Are you compliant with building regulations?
Yes. All foundation and underpinning work carried out by Fry Site Services complies with Part A of the Building Regulations. We coordinate with building control throughout and provide full documentation on completion.
Other Services
Why Choose Fry Site Services
Deconstruction, groundworks, and waste management in one seamless process.
Cut costs and streamline your process with a single, dependable provider.
We’ll oversee the planning, logistics, and execution, so you don’t have to lift a finger.
With our skilled operators and expert management, every project stays on track.
Waste management through our sister company ensures eco-friendly practices and reduced costs.
We combine expertise, education and dedication for results you can rely on.