County Tyrone · Northern Ireland
Bay window subsidence repairs in County Tyrone
Homes in County Tyrone are mostly market-town terraces. That matters for bay window subsidence repairs: footings, wall construction and mortar all vary with the age of the building. Shrinkable clay is less common in County Tyrone than in south-east England.
Guide price from£530per bay inc VAT
- Area
- County Tyrone
- Pricing region
- Northern Ireland
- Ground
- Mostly firmer ground
- Towns listed
- 4
What should you know about the ground under County Tyrone?
Tyrone has glacial till over varied rock, with a small historic coalfield around Coalisland near Dungannon.
Parts of County Tyrone lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. What you mostly find across County Tyrone: market-town terraces, rural houses and post-war estates.
What happens when we carry out bay window subsidence repairs in County Tyrone?
Photos and first view
Send photos of the outside junction, the inside corners and the window, with a scale. We give a free initial assessment and tell you whether the crack looks old and stable or whether an engineer should inspect first.
Engineer and checks
Where the cause is unclear, an independent chartered structural engineer inspects, sometimes with a trial pit at the bay and a drain survey. We can arrange the engineer. Monitoring may be suggested if the movement could be seasonal.
Carry out the work
Ties are fitted across the junction, or the bay is underpinned in sequence with building control inspecting the dig. The bay window and flashings are checked and eased or resealed where the movement has disturbed them.
Signs you may need bay window subsidence repairs
- Gaps opening around the internal bay window board
- A step or slope in the bay floor towards the window
- Bay roof or lead flashing pulling away from the main wall
- Bay window sash or casement sticking or binding
How much will bay window subsidence repairs cost in County Tyrone?
The ranges below reflect typical Northern Ireland costs for bay window subsidence repairs, including VAT. Scaffold, access and making good can push a job to the top of the range.
| Item | Guide price | Per |
|---|---|---|
| Bay junction crack repair and tie-inest. | £530 – £1,600 | per bay |
| Traditional underpinning of a bay | £2,650 – £6,150 | per bay |
| Mini-piled bay underpinning | £4,400 – £10,600 | per bay |
Which repair method suits a home in County Tyrone?
Mini-piled bay underpinning
Small piles are installed to depth around or beneath the bay and linked by a reinforced beam or needles that pick up its weight. It suits deeper soft ground and heavy root activity, and the compact rigs fit into a front garden.
Best for: Deep clay, nearby trees, or poor ground below the bay
Traditional underpinning of the bay
The bay footing is excavated in short sections and new mass concrete is placed down to firmer ground below the zone affected by roots and seasons. Because a bay is a short length of wall, the work is compact, but it needs building control approval.
Best for: Active bay movement on firm ground at moderate depth
Junction crack repair and tie-in
Where movement has stopped, the open joint between bay and house is raked out, stainless ties or helical bars are fixed across it, and the joint is repointed to match. Internal plaster along the crack is cut back and renewed before redecoration.
Best for: Old, stable cracks where the bay is no longer moving
Do you need approval for bay window 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.
Towns in County Tyrone we cover for bay window subsidence repairs
Bay window subsidence repairs in County Tyrone: questions and answers
Is the ground in County Tyrone prone to subsidence?
Tyrone has glacial till over varied rock, with a small historic coalfield around Coalisland near Dungannon. Parts of County Tyrone lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. Only an investigation on site can say why a particular building has moved.
How much will bay window subsidence repairs cost in County Tyrone?
On Northern Ireland rates, bay window subsidence repairs starts from about £530 per bay, including VAT. The written price depends on the extent of the damage, access and whether an engineer or building control is needed.
Can a bay be underpinned without underpinning the house?
Yes, underpinning only the bay is common because it is usually the part on shallower footings. The engineer designs the junction so the strengthened bay and the existing house can move slightly without cracking, sometimes with a movement joint or ties.
Why do bay windows crack away from the house?
Bays often stand on shallower footings than the main walls, so they react to drying clay, roots and drain leaks that the deeper house foundations escape. Many bays were also never properly tied in, so any movement opens a clean vertical crack at the junction.
Will the bay window need replacing?
Usually not. Most windows can be eased, packed or resealed once the bay is stable. If the frame has twisted badly or the glass has cracked, replacement may be worth considering. Under a claim, upgrades beyond like-for-like are normally priced separately.