Staines-upon-Thames · Surrey
Extension pulling away repairs in Staines-upon-Thames
For many Staines-upon-Thames homes, the extension was added decades after the house was built, on concrete that never matched the original footings. Where that difference causes movement, a designed movement joint or a deeper foundation is the usual fix.
Guide price from£670per junction inc VAT
- Postcodes
- TW18, TW19, TW20
- Population
- about 51,000
- Area
- Surrey
- Pricing region
- South East
Why does the ground in Surrey matter for extension pulling away repairs?
Staines-upon-Thames is in Surrey and takes in postcode districts TW18, TW19, TW20. About 51,000 people live there. Neighbouring towns we cover: Egham (2 miles), Ashford (2 miles) and Chertsey (3 miles).
Much of Surrey sits on clay that shrinks in dry summers and swells in wet winters. Ground movement here is more often linked to soils, drains and trees than to mining. Housing stock in Surrey: Victorian and Edwardian villas, 1930s semis and detached houses in the commuter towns, and post-war estates.
What happens during extension pulling away repairs, step by step?
Show us the junction
Send photos of the crack outside, the internal corner and any flashing above, with a measure for scale. We give a free initial assessment and an initial view on whether the gap is likely old or still opening.
Choose the fix
The engineer decides between ties, a movement joint or underpinning. We confirm a fixed price in writing once the repair is specified, covering the junction, flashings, internal finishes and any foundation work.
Finish and hand over
Internal corners are replastered, skirtings and coving refixed, and doors or windows in the extension eased where the movement affected them. Records of the repair and any approvals are passed to you.
What to look for before calling about extension pulling away repairs
- Extension roof flashing lifting off the original wall
- Patio doors or windows in the extension starting to bind
- Daylight or draughts showing through the internal corner joint
Extension pulling away repairs prices in Staines-upon-Thames
Guide prices below are for homes in Staines-upon-Thames, on South East rates and including VAT. A survey or good photos let us turn them into a fixed written price.
| Item | Guide price | Per |
|---|---|---|
| Junction crack repair with stainless tiesest. | £670 – £2,250 | per junction |
| Movement joint and making goodest. | £450 – £1,350 | per junction |
| Underpinning the extension where needed | £1,100 – £2,800 | per metre of wall |
How we usually approach extension pulling away repairs
Underpinning the extension
If the extension is still dropping because its footings are too shallow or on poor ground, they are taken deeper by mass concrete, beam-and-base or mini-piles. The engineer designs the scheme, and the junction is repaired once the new foundation is in.
Best for: Active movement from shallow footings, roots or soft ground
Junction crack repair with stainless ties
The open joint is cut out, stainless ties or helical bars are fixed across it into both the old and new masonry, and the joint is repointed or rendered to match. Inside, the corner is replastered. This suits extensions that moved once and have since stopped.
Best for: Settled extensions with a stable gap at the junction
Rules for extension pulling away 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 extension pulling away repairs in Staines-upon-Thames
How much should I budget for extension pulling away repairs in Staines-upon-Thames?
Guide prices for extension pulling away repairs in Staines-upon-Thames start from about £670 per junction, 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.
Can you survey a property in Staines-upon-Thames?
Yes, Staines-upon-Thames is covered, along with postcode districts TW18, TW19, TW20. We also cover nearby Egham and Ashford.
Why do houses in Surrey crack?
North Surrey sits on London Clay, the south on Weald Clay, with chalk along the North Downs and sands in the west. Large gardens with mature trees on clay make seasonal subsidence a familiar problem. Only an investigation can say why a particular building has moved.
Can a drain under my extension cause it to move?
Yes, a cracked or displaced drain beneath or beside an extension can soften clay or wash away fine soil. A CCTV drain survey usually finds it. Repairing the drain is often the first and most important step before any repair to the walls.
Will my extension need underpinning?
Often not. Many separating extensions are fixed by repairing a drain, tying the junction or forming a movement joint. Underpinning is for extensions that keep dropping because their footings are too shallow or the ground beneath is poor, as shown by monitoring.
Related work in Staines-upon-Thames
- Gable end wall repairs
- Crack stitching
- Chimney stack repairs
- Boundary and garden wall repairs
- Retaining wall repairs
Extension pulling away repairs near Staines-upon-Thames
Call about the cracked extension junction at your Staines-upon-Thames property; a free initial assessment first, then a fixed written price once the repair is specified.