Croydon · Greater London
Extension pulling away repairs in Croydon
The ground under Croydon and Greater London varies street by street, and extensions built on shallower footings feel those differences first. A trial pit and a drain survey usually tell an engineer how the extension’s foundation is coping.
Guide price from£750per junction inc VAT
- Postcodes
- CR0, CR2, CR5, CR7, CR8
- Population
- about 390,000
- Area
- Greater London
- Pricing region
- London
Why does the ground in Greater London matter for extension pulling away repairs?
We cover the whole of Croydon, including postcode districts CR0, CR2, CR5, CR7, CR8; about 390,000 people live in the borough. Nearby, we also cover 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. What you mostly find across Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
What happens when we carry out extension pulling away repairs in Croydon?
Show us the junction
Send photos of the crack outside, the internal corner and any flashing above, with a measure for scale. We give a free initial assessment and an initial view on whether the gap is likely old or still opening.
Find what is moving
An independent chartered structural engineer can inspect, and we can arrange one. A drain survey under the extension, a trial pit at its footing and tell-tale monitoring across the joint are common checks before choosing the repair.
Choose the fix
The engineer decides between ties, a movement joint or underpinning. We confirm a fixed price in writing once the repair is specified, covering the junction, flashings, internal finishes and any foundation work.
Signs you may need extension pulling away repairs
- Patio doors or windows in the extension starting to bind
- Floor level dropping where the extension and house floors meet
- Extension roof flashing lifting off the original wall
How much will extension pulling away repairs cost in Croydon?
Prices in Croydon are worked out on London rates. They include VAT and are a starting point: access, the extent of the damage and whether an engineer or building control is involved all move the figure.
| Item | Guide price | Per |
|---|---|---|
| Junction crack repair with stainless tiesest. | £750 – £2,500 | per junction |
| Movement joint and making goodest. | £500 – £1,500 | per junction |
| Underpinning the extension where needed | £1,250 – £3,100 | per metre of wall |
Which repair method suits a home in Croydon?
Junction crack repair with stainless ties
The open joint is cut out, stainless ties or helical bars are fixed across it into both the old and new masonry, and the joint is repointed or rendered to match. Inside, the corner is replastered. This suits extensions that moved once and have since stopped.
Best for: Settled extensions with a stable gap at the junction
Movement joint and making good
Where some seasonal movement is expected to continue, the junction is formed into a proper flexible movement joint with a compressible filler and sealant, so the two parts can move without cracking. Flashings and internal finishes are detailed to suit.
Best for: Minor ongoing movement that does not threaten the structure
Rules for extension pulling away repairs 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.
Extension pulling away repairs in Croydon: questions and answers
How much should I budget for extension pulling away repairs in Croydon?
Guide prices for extension pulling away repairs in Croydon start from about £750 per junction, 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?
Yes, Croydon is covered, along with postcode districts CR0, CR2, CR5, CR7. We also cover nearby Sutton and Caterham.
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.
What is a movement joint?
A movement joint is a deliberate, flexible break in a wall that lets two parts of a building move slightly without cracking. It is filled with a compressible material and sealed. At an extension junction it can replace a rigid joint that keeps cracking.
Can a drain under my extension cause it to move?
Yes, a cracked or displaced drain beneath or beside an extension can soften clay or wash away fine soil. A CCTV drain survey usually finds it. Repairing the drain is often the first and most important step before any repair to the walls.
Related work in Croydon
- Concrete repairs
- Resin injection ground stabilisation
- Gable end wall repairs
- Subsidence repairs
- Subsidence insurance claim repairs
Extension pulling away repairs near Croydon
For a no-obligation written quote to repair an extension pulling away in Croydon, call or send a few photos with a tape measure across the gap.