Bexhill-on-Sea · East Sussex
Bay window subsidence repairs in Bexhill-on-Sea
If your Bexhill-on-Sea bay window has started sticking and a gap has opened at the junction, it is worth finding out whether the bay is still moving. A stable crack needs a straightforward tie-in, whereas an active one may need a new foundation.
Guide price from£670per bay inc VAT

- Postcodes
- TN39, TN40
- Population
- about 44,000
- Area
- East Sussex
- Pricing region
- South East
What should you know about the ground under Bexhill-on-Sea?
Postcode districts TN39, TN40 cover Bexhill-on-Sea, a East Sussex town of about 44,000 people. We also take enquiries from nearby Hastings (5 miles), Hailsham (9 miles) and Eastbourne (10 miles).
East Sussex 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. Across East Sussex, most homes are Regency and Victorian terraces on the coast, Wealden timber-framed houses, and inter-war bungalows and semis.
How we usually approach bay window subsidence repairs
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
What happens during bay window subsidence repairs, step by step?
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.
Make good inside
Plaster around the bay and along the junction is renewed, the window board is refixed and the room is ready for decoration. Building control paperwork, where it applies, is passed to you for your records.
What to look for before calling about bay window subsidence repairs
- Bay window sash or casement sticking or binding
- Cracks above the bay window head or below the sill
- A step or slope in the bay floor towards the window
Bay window subsidence repairs prices in Bexhill-on-Sea
The ranges below reflect typical South East 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. | £670 – £2,000 | per bay |
| Traditional underpinning of a bay | £3,350 – £7,850 | per bay |
| Mini-piled bay underpinning | £5,600 – £13,400 | per bay |
Rules for bay window 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.
Questions about bay window subsidence repairs in Bexhill-on-Sea
How much will bay window subsidence repairs cost in Bexhill-on-Sea?
Guide prices for bay window subsidence repairs in Bexhill-on-Sea start from about £670 per bay, including VAT, on South East rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you cover Bexhill-on-Sea?
Yes, Bexhill-on-Sea is covered, along with postcode districts TN39, TN40. We also cover nearby Hastings and Hailsham.
Is the ground in East Sussex prone to subsidence?
Inland East Sussex is Weald Clay and Wealden sands, while the South Downs and the coast around Brighton and Eastbourne are chalk. The Weald Clay areas are prone to shrink-swell movement near trees. Only an investigation can say why a particular building has moved.
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.
Is a crack between my bay and the house serious?
It is often not serious, especially if it is old, fine and unchanged for years. A crack that is widening, tapering or matched by sticking windows and a sloping bay floor needs looking at. An engineer’s inspection, sometimes with monitoring, will confirm whether the bay is still moving.
Other structural repairs in Bexhill-on-Sea
- Brick arch repairs
- Crack stitching
- Structural crack repairs
- Structural surveys and crack monitoring
- Wall tie replacement
Bay window subsidence repairs near Bexhill-on-Sea
Call about the cracked bay at your Bexhill-on-Sea property; a free initial assessment comes first, with a fixed written price once the repair is specified.