Underpinning
Underpinning involves strengthening the existing foundations of a building to provide additional support. This is typically required when the original foundation is no longer strong enough to support the structure, often due to changes in soil conditions, nearby construction, or subsidence damage.
Key Benefits
Multiple underpinning methods available
Suitable for all property types
Structural engineering expertise
Building regulations compliant
Long-term foundation stability
Can increase property value
Is Underpinning Right for You?
Ideal for
Foundations that have become too shallow or weak for the structure
Properties where soil conditions have changed over time
Buildings affected by nearby construction or excavation
Extensions or additions requiring deeper foundation support
Properties on made ground or poor load-bearing soil
Not suitable for
Minor surface-level cracking with no structural movement
Issues caused by leaking drains (drain repair needed first)
Properties where resin injection would be more cost-effective
How It Works
Assessment
Thorough assessment of your foundations and soil conditions.
Design
Our engineers design the optimal underpinning solution for your property.
Installation
Expert installation using the chosen underpinning method.
Certification
Full documentation and certification of completed works.
Underpinning Across Hertfordshire
Click a location for local details.
Frequently Asked Questions
How much does underpinning cost?
Mass concrete underpinning typically costs £1,500–£3,000 per metre run. Mini-piled underpinning is more expensive but necessary for deeper or more complex foundations. We provide a fixed quote after a free survey — no hidden costs.
Do I need planning permission for underpinning?
No, underpinning is classed as a repair and doesn't require planning permission. However, building control approval is usually needed, and we handle the full application and sign-off process.
How long does underpinning take?
A typical residential underpinning project takes 2–4 weeks. More complex jobs involving mini-piles or full perimeter work can take 4–8 weeks. We confirm the schedule upfront.
Is underpinning covered by insurance?
Yes, if the underpinning is needed because of subsidence. Your insurer will typically require a structural engineer's report, which we provide as part of our service.
Can I stay in my house during underpinning?
Yes, in most cases. There will be some noise and excavation outside the property, but it's usually possible to continue living in the home throughout the work.
Does underpinning devalue a property?
No. Properly certified underpinning with a structural warranty can actually reassure buyers and lenders. We provide full documentation that satisfies mortgage and conveyancing requirements.
Free Underpinning Survey
No obligation quote