Merton · Greater London
Subsidence repairs in Merton
Cracks in a house in Merton are not always subsidence, and subsidence is not always serious. The first job is to find out what is moving and why, whether that is a leaking drain, a nearby tree or soft ground under shallow footings.
Guide price from£3,100per property inc VAT
- Postcodes
- CR4, SM4, SW19, SW20
- Population
- about 220,000
- Area
- Greater London
- Pricing region
- London
What should you know about the ground under Merton?
We cover the whole of Merton, including postcode districts CR4, SM4, SW19, SW20; about 220,000 people live in the borough. If you are just outside Merton, we also cover Wandsworth (3 miles), Sutton (3 miles) and Kingston upon Thames (4 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. Typical buildings in Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
Signs you may need subsidence repairs
- Diagonal cracks wider at the top, running from window or door corners
- Cracks that open in summer and partly close again in winter
- Fresh cracks showing on both the inside and outside of one wall
How much will subsidence repairs cost in Merton?
The ranges below reflect typical London costs for subsidence repairs, including VAT. Scaffold, access and making good can push a job to the top of the range.
| Item | Guide price | Per |
|---|---|---|
| Structural engineer's investigation and report | £625 – £2,500 | per property |
| CCTV drain survey (common first check) | £190 – £440 | per survey |
| Typical repair once the cause is dealt with: crack stitching and making goodest. | £3,100 – £15,000 | per property |
| Foundation strengthening where it is needed (see underpinning) | £1,250 – £4,400 | per metre of wall |
Which repair method suits a home in Merton?
Crack stitching and making good
Once movement has stopped, cracked brickwork is cut along the bed joints, stainless helical bars are bonded in to tie the wall together, and the joints are repointed to match. Inside, plaster is renewed along the crack line before redecoration.
Best for: Category 1 to 3 cracking in walls that are otherwise sound
Remove the cause, then repair
Most subsidence is dealt with this way. The drain is repaired or the vegetation managed, the house is watched to confirm it has stabilised, and then the cracks are stitched, repointed and made good inside. It is the least disruptive route and usually the cheapest.
Best for: Clay movement or drain leaks where the cause can be removed
What happens when we carry out subsidence repairs in Merton?
Deal with the cause
Drains are repaired, vegetation is managed on the engineer’s advice, or a foundation scheme is designed if nothing else will work. Where monitoring is recommended, readings run for several months to show the movement has stopped.
Written quote
We price the agreed repair and confirm a fixed price in writing once it is specified. If there is an insurance claim, we can price to the loss adjuster’s or engineer’s schedule instead of our own scope.
Repairs and making good
Cracks are stitched and repointed outside, plaster is renewed along the crack lines inside, and sticking doors are eased. Where the work needs it, we deal with building control and hand over the paperwork.
Rules for subsidence 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.
Subsidence repairs in Merton: questions and answers
How much will subsidence repairs cost in Merton?
Guide prices for subsidence repairs in Merton start from about £3,100 per property, 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 Merton?
Yes, Merton is covered, along with postcode districts CR4, SM4, SW19, SW20. We also cover nearby Wandsworth and Sutton.
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.
Do you need to visit before giving a price?
Not at first. We give a free initial assessment from your photos or a call, and a no-obligation written quote once the scope is clear. A fixed price follows in writing once the repair is specified, which normally needs a survey.
How do I know if cracks are subsidence?
Subsidence cracks are usually tapered, run diagonally from door and window corners, and show on both faces of the wall. Fine vertical cracks in new plaster are more often shrinkage. An engineer’s inspection, sometimes with monitoring, is the reliable way to tell.
Other structural repairs in Merton
- Wall tie replacement
- Roof structure repairs
- Floor joist repairs
- Brick arch repairs
- Extension pulling away repairs
Subsidence repairs near Merton
Get a free initial assessment for subsidence damage in Merton: send photos or call, and a written quote follows once the repair is specified.