Croydon · Greater London
Underpinning in Croydon
The ground under Croydon and the wider Greater London decides how deep an underpinning scheme has to go. Where firm ground lies close to the surface, mass concrete is usually the practical choice, while deeper soft ground often points to mini-piles.
Guide price from£1,250per metre of wall inc VAT
- Postcodes
- CR0, CR2, CR5, CR7, CR8
- Population
- about 390,000
- Area
- Greater London
- Pricing region
- London
What is the ground like in Greater London?
Croydon takes in postcode districts including CR0, CR2, CR5, CR7, CR8, with about 390,000 residents. Nearby places we cover include Sutton (5 miles), Caterham (5 miles) and Banstead (6 miles).
Greater London is one of the parts of the UK where clay soils are most likely to move with the seasons. Ground movement here is more often linked to soils, drains and trees than to mining. Housing stock in Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
How much will underpinning cost in Croydon?
Guide prices below are for homes in Croydon, on London rates and including VAT. A survey or good photos let us turn them into a fixed written price.
| Item | Guide price | Per |
|---|---|---|
| Mass-concrete underpinning | £1,250 – £1,900 | per metre of wall |
| Beam-and-base underpinning | £1,900 – £3,100 | per metre of wall |
| Mini-piled underpinning | £2,500 – £4,400 | per metre of wall |
| Engineer's design and building control feesest. | £1,000 – £3,100 | per scheme |
Which repair method suits a home in Croydon?
Beam-and-base underpinning
A reinforced concrete beam is cast beneath or alongside the existing footing and carries the wall onto mass concrete bases at intervals. It spreads load well across variable ground and can mean less digging than continuous underpinning along the whole wall.
Best for: Longer runs of wall or heavier loads over variable ground
Mass concrete underpinning
The traditional method. Short sections under the wall are dug out in a set sequence, usually about a metre at a time, and filled with concrete before the next section is opened. It suits moderate depths and good access, and it needs little specialist plant.
Best for: Shallow failures on firm ground found at moderate depth
What happens when we carry out underpinning in Croydon?
Engineer’s investigation
An independent chartered structural engineer studies the monitoring results, trial pits and soil tests, then decides whether underpinning is needed and which method suits. We can arrange the engineer if you do not already have one.
Excavation and concrete
Work runs in the sequence the engineer sets so the wall is never left unsupported over a long length. Building control inspects the excavations before concrete goes in, and each section is dry-packed tight to the footing above.
Crack repairs and handover
Once the new foundation has cured, cracks are stitched and repointed, inside walls are made good, and paths or patios disturbed by the dig are reinstated. You receive the building control completion paperwork for your records.
Signs you may need underpinning
- One corner of the house visibly lower than the others
- A large tree nearby that cannot be removed or reduced
- Movement continuing through more than one winter of monitoring
Rules for underpinning in England
In England, underpinning and other work that alters or strengthens a wall or foundation is building work under the Building Regulations (Part A, structure), so building control approves and inspects it. Like-for-like repairs often are not, and we tell you which applies before a price is agreed. Work to a party wall, or excavation close to a neighbour’s foundations, can also need a notice under the Party Wall etc. Act 1996.
Underpinning in Croydon: questions and answers
How much should I budget for underpinning in Croydon?
Guide prices for underpinning in Croydon start from about £1,250 per metre of wall, including VAT, on London rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Can you survey a property in Croydon?
We do. Croydon and the surrounding area are covered, including nearby Sutton and Caterham. A free initial assessment from your photos is the first step.
Why do houses in Greater London crack?
Most of Greater London sits on London Clay, among the most shrinkage-prone ground in the UK, with river gravels along the Thames. Subsidence claims here are among the most frequent in the country, especially after dry summers and near street and garden trees. Only an investigation can say why a particular building has moved.
Which underpinning method is best?
The right method depends on how deep firm ground lies, the load on the wall and the access. Mass concrete suits moderate depths, beam-and-base spreads heavier loads, and mini-piles reach deep soft ground or work through tight access. The engineer chooses the method from the site investigation.
Can I stay in my house during underpinning?
Most people stay at home during external underpinning, because the digging happens outside along the wall. Expect noise, restricted access to that side of the house and some dust. If the work has to be done from inside, through the floor, moving out for part of the job is sometimes advised.
Related work in Croydon
- Subsidence insurance claim repairs
- Wall tie replacement
- Extension pulling away repairs
- Structural crack repairs
- Roof structure repairs
Underpinning near Croydon
If your insurer has agreed underpinning for your Croydon home, share the loss adjuster’s schedule and we will price the repair to it in writing.