County Londonderry · Northern Ireland
Subsidence repairs in County Londonderry
We carry out subsidence repairs across County Londonderry, from the larger towns to smaller places nearby. Most of County Londonderry is on firmer ground than the clay belts of the south-east. Every job starts with the cause, then the repair is specified to match it.
Guide price from£2,200per property inc VAT
- Area
- County Londonderry
- Pricing region
- Northern Ireland
- Ground
- Mostly firmer ground
- Towns listed
- 4
Why does the ground in County Londonderry matter for subsidence repairs?
County Londonderry has basalt, older hard rock and glacial deposits, with soft river ground along the Foyle and Bann.
Ground movement here is more often linked to soils, drains and trees than to mining. Typical buildings in County Londonderry: Georgian and Victorian houses in Derry, brick terraces and post-war estates.
What should you budget for subsidence repairs in County Londonderry?
Prices in County Londonderry are worked out on Northern Ireland 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 |
|---|---|---|
| Structural engineer's investigation and report | £440 – £1,750 | per property |
| CCTV drain survey (common first check) | £130 – £310 | per survey |
| Typical repair once the cause is dealt with: crack stitching and making goodest. | £2,200 – £10,600 | per property |
| Foundation strengthening where it is needed (see underpinning) | £880 – £3,100 | per metre of wall |
Repair options we may recommend
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
Foundation strengthening
Where the ground cannot be made stable, the load is carried down to firmer soil by underpinning, a beam-and-base scheme, mini-piles or resin injection, depending on the soil and access. It is designed by an engineer and is the exception, not the rule.
Best for: Ongoing movement where removing the cause has not worked
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 to expect when we carry out subsidence repairs
Send photos or call
Send photos of the cracks with a coin or tape for scale, and say when you first noticed them. We give a free initial assessment and suggest whether an engineer, a drain survey or your insurer comes first.
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.
Is it time for subsidence repairs? Common signs
- Fresh cracks showing on both the inside and outside of one wall
- Cracks that open in summer and partly close again in winter
- Wallpaper rippling or tearing where the wall meets the ceiling
- Diagonal cracks wider at the top, running from window or door corners
Do you need approval for subsidence repairs in Northern Ireland?
In Northern Ireland, the Building Regulations (Northern Ireland) 2012 apply and the council’s building control service approves structural work such as underpinning; minor like-for-like repairs usually need no approval. The Party Wall Act does not apply in Northern Ireland, so work to shared walls depends on deeds and agreement with neighbours.
Find subsidence repairs in your County Londonderry town
Your subsidence repairs questions
Why do houses in County Londonderry crack?
County Londonderry has basalt, older hard rock and glacial deposits, with soft river ground along the Foyle and Bann. Ground movement here is more often linked to soils, drains and trees than to mining. Only an investigation on site can say why a particular building has moved.
How much will subsidence repairs cost in County Londonderry?
On Northern Ireland rates, subsidence repairs starts from about £2,200 per property, including VAT. The written price depends on the extent of the damage, access and whether an engineer or building control is needed.
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.
Can I sell a house that has had subsidence?
Yes, though buyers and lenders will want paperwork. Keep the engineer’s report, monitoring results, the repair specification and any building control sign-off. A repaired house shown to be stable is far easier to sell than one with an open problem.
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.