County Louth · checked 29 October 2026
Underpinning in County Louth
Louth is mostly well-drained brown earth, with softer alluvial ground along the Boyne and the Castletown River.
Facts on this page checked against each source on 29 October 2026. Each one links to its source. How we check
In Census 2022, 27.9% of the 49,332 households in County Louth lived in homes built before 1971, against 28.5% nationally, and 7.1% in homes built before 1919 (CSO).
Underpinning here works the way it does everywhere: a chartered structural engineer first, then the cause, then the design. This page adds what is particular to County Louth: the age of its houses, its ground, and the schemes that apply.
The age of the housing in County Louth
| Area | Households | Pre-1919 | Pre-1971 | Pre-1991 | 1991 to 2010 |
|---|---|---|---|---|---|
| County Louth | 49,332 | 7.1% | 27.9% | 49.1% | 39.6% |
| Ireland | 1,836,728 | 8.4% | 28.5% | 50.8% | 39.1% |
Source: CSO Census 2022, table SAP2022T6T2CTY, permanent private households by year built. Shares are of all households, including those whose year built wasn't stated.
Why age matters: civil engineer Kieran McCarthy says most Irish suburbs built in the early 1970s or before will likely have clay drains, and that leaking drains cause most of the subsidence he sees (Irish Examiner, 2021). And the national Building Regulations, including requirement A2 that foundations cope with ground movement, apply to buildings from 1 June 1992 on (TGD A). In County Louth, 49.1% of households live in homes built before 1991.
Ground conditions in County Louth
- Brown earths dominate south of the Cooley Mountains. They are well drained (Farmers Journal soil survey of Co. Louth).
- Along the Boyne and the Castletown River the soils formed in river, lake, estuarine or marine alluvium and have a high water table (Farmers Journal).
- South of Ardee and west of Drogheda the shale hills have surface-water gleys on the lower slopes. The Cooley soils are shallow and peaty over rock (Farmers Journal).
These notes describe the county's soils and geology in general. They are background for a conversation with an engineer, never a verdict on one house.
Pyrite and defective blocks in County Louth
County Louth isn't one of the Pyrite Remediation Scheme areas as published in 2020 (C&AG; gov.ie). If your house has cracked floors from below, or blocks that are crumbling, read about the difference first.
See pyrite and defective blocks.
Getting a house in County Louth looked at
- Record the cracks.Dated photos, inside and out, with a ruler in the shot. Don't fill them yet.
- Get a chartered structural engineer.The engineer grades the cracks, finds the cause and decides whether underpinning is needed at all. Engineers Ireland awards the CEng MIEI title (Engineers Ireland).
- Check the drains.A CCTV drain survey shows whether old drains are leaking, the usual cause.
- Tell your insurer if you're claiming.As soon as reasonably possible. See the insurance guide.
- Get the design priced.Send your details and one experienced groundworks and underpinning contractor who covers your county rings you to talk it through.
The full order of work is on the underpinning process page, and the methods on underpinning methods.
Nearby counties
County Meath · Dublin · All county pages
Questions people ask
Is alluvium bad ground for a house?
Alluvium and estuarine deposits can be soft and compressible. Geological Survey Ireland describes loading such deposits as able to compress them and lower the surface. Whether that affects your house depends on its foundations, which an engineer checks.
How old are Louth's homes?
In Census 2022, 27.9% of Louth's 49,332 households lived in homes built before 1971.
Who will ring me?
We pass your request to one experienced groundworks and underpinning contractor who covers your county. Your number isn't sent to a list. They ring you, ask what's happening and about any engineer's report, and price the work from the engineer's design. Nothing is booked until you say yes.
Cracks in a house in County Louth?
Five quick questions and one experienced groundworks and underpinning contractor who covers your county rings you. Or call 087 162 1846 between 8am and 8pm.