Kensington and Chelsea · Greater London
Extension pulling away repairs in Kensington and Chelsea
If the corner joint in your Kensington and Chelsea extension keeps splitting after you fill it, something is still moving. Measuring the gap over a few months, with dated photos, gives an engineer the evidence to recommend the right repair.
Guide price from£750per junction inc VAT
- Postcodes
- SW3, SW5, SW7, SW10, W2
- Population
- about 140,000
- Area
- Greater London
- Pricing region
- London
What should you know about the ground under Kensington and Chelsea?
Kensington and Chelsea takes in postcode districts including SW3, SW5, SW7, SW10, W2, with about 140,000 residents. We also take enquiries from nearby Hammersmith and Fulham (1 miles), Westminster (2 miles) and Wandsworth (3 miles).
Shrinkable clay is widespread in Greater London. Ground movement here is more often linked to soils, drains and trees than to mining. Across Greater London, most homes are Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
What to look for before calling about extension pulling away repairs
- Extension roof flashing lifting off the original wall
- Daylight or draughts showing through the internal corner joint
- Patio doors or windows in the extension starting to bind
Extension pulling away repairs prices in Kensington and Chelsea
The ranges below reflect typical London costs for extension pulling away repairs, including VAT. Scaffold, access and making good can push a job to the top of the range.
| 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 |
How we usually approach extension pulling away repairs
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
What happens during extension pulling away repairs, step by step?
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.
Repair the junction
Drains are repaired first if they are leaking. The joint is then tied, formed as a movement joint or rebuilt after underpinning, with roof flashings reset so the junction stays watertight. Building control is handled where needed.
Finish and hand over
Internal corners are replastered, skirtings and coving refixed, and doors or windows in the extension eased where the movement affected them. Records of the repair and any approvals are passed to you.
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.
Questions about extension pulling away repairs in Kensington and Chelsea
How much will extension pulling away repairs cost in Kensington and Chelsea?
Guide prices for extension pulling away repairs in Kensington and Chelsea 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.
Do you cover Kensington and Chelsea?
We do. Kensington and Chelsea and the surrounding area are covered, including nearby Hammersmith and Fulham and Westminster. A free initial assessment from your photos is the first step.
Is the ground in Greater London prone to subsidence?
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.
Will my extension need underpinning?
Often not. Many separating extensions are fixed by repairing a drain, tying the junction or forming a movement joint. Underpinning is for extensions that keep dropping because their footings are too shallow or the ground beneath is poor, as shown by monitoring.
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.
Other structural repairs in Kensington and Chelsea
- Bay window subsidence repairs
- Roof structure repairs
- Bowing wall repairs
- Crack stitching
- Concrete repairs
Extension pulling away repairs near Kensington and Chelsea
Share the loss adjuster’s schedule for your Kensington and Chelsea extension claim, and we will price the junction repair and making good to it in writing.