Poole · Dorset
Bay window subsidence repairs in Poole
A cracked bay in Poole can be anything from an old, stable joint to a foundation that is still dropping. Photos of the outside junction and the inside corners usually show which is more likely and whether an engineer should look.
Guide price from£620per bay inc VAT
- Postcodes
- BH14, BH15, BH17
- Population
- about 150,000
- Area
- Dorset
- Pricing region
- South West
What is the ground like in Dorset?
Poole (BH14, BH15, BH17) has around 150,000 residents and sits in Dorset. Nearby places we cover include Bournemouth (5 miles), Wimborne Minster (5 miles) and Ferndown (7 miles).
Clay soils are found in parts of Dorset. Ground movement here is more often linked to soils, drains and trees than to mining. Across Dorset, most homes are stone and brick villages, Victorian villas in Bournemouth, and inter-war and post-war semis.
How we usually approach bay window subsidence repairs
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
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
What happens during bay window subsidence repairs, step by step?
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.
Agree the repair
The engineer decides between tie-in repairs and underpinning. We confirm a fixed price in writing once the repair is specified, including scaffolding if needed, the bay window, roof flashing and internal making good.
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 roof or lead flashing pulling away from the main wall
- Gaps opening around the internal bay window board
- A step or slope in the bay floor towards the window
Bay window subsidence repairs prices in Poole
These are guide prices for Poole, using South West rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.
| Item | Guide price | Per |
|---|---|---|
| Bay junction crack repair and tie-inest. | £620 – £1,850 | per bay |
| Traditional underpinning of a bay | £3,100 – £7,200 | per bay |
| Mini-piled bay underpinning | £5,150 – £12,400 | 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 Poole
What is the price of bay window subsidence repairs in Poole?
Guide prices for bay window subsidence repairs in Poole start from about £620 per bay, including VAT, on South West rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you carry out bay window subsidence repairs in Poole?
Yes. We take enquiries from across Poole, including BH14, BH15, BH17, and from nearby places such as Bournemouth and Wimborne Minster. Send photos for a free initial view and we will tell you what happens next.
Does the ground around Poole cause cracking?
Dorset mixes chalk downs, Oxford and Kimmeridge Clays in the vales, and the sands and gravels of the Poole basin. Clay vales can shrink and swell, and parts of the coast are known for landslip. Only an investigation can say why a particular building has moved.
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.
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.
More repairs we carry out in Poole
- Lintel replacement
- Structural surveys and crack monitoring
- Bowing wall repairs
- Wall tie replacement
- Retaining wall repairs
Bay window subsidence repairs near Poole
If your insurer is handling a bay claim at your Poole property, share the schedule and we will price the repair to it in writing.