Corby · Northamptonshire
Extension pulling away repairs in Corby
For many Corby 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£590per junction inc VAT
- Postcodes
- NN17, NN18
- Population
- about 68,000
- Area
- Northamptonshire
- Pricing region
- East Midlands
How do local ground conditions affect extension pulling away repairs in Corby?
With roughly 68,000 people, Corby spans postcode districts NN17, NN18 in Northamptonshire. Neighbouring towns we cover: Uppingham (6 miles), Kettering (7 miles) and Market Harborough (10 miles).
Shrinkable clay is widespread in Northamptonshire. Historic ironstone working has left disturbed ground in places. Across Northamptonshire, most homes are ironstone and limestone cottages, Victorian terraces in Northampton and Kettering, and new-town estates in Corby.
What to look for before calling about extension pulling away repairs
- Mastic or render at the joint repeatedly splitting open
- Extension roof flashing lifting off the original wall
- Daylight or draughts showing through the internal corner joint
Extension pulling away repairs prices in Corby
These are guide prices for Corby, using East Midlands rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.
| Item | Guide price | Per |
|---|---|---|
| Junction crack repair with stainless tiesest. | £590 – £1,950 | per junction |
| Movement joint and making goodest. | £390 – £1,200 | per junction |
| Underpinning the extension where needed | £980 – £2,450 | per metre of wall |
How we usually approach extension pulling away repairs
Movement joint and making good
Where some seasonal movement is expected to continue, the junction is formed into a proper flexible movement joint with a compressible filler and sealant, so the two parts can move without cracking. Flashings and internal finishes are detailed to suit.
Best for: Minor ongoing movement that does not threaten the structure
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
What happens during extension pulling away repairs, step by step?
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.
Repair the junction
Drains are repaired first if they are leaking. The joint is then tied, formed as a movement joint or rebuilt after underpinning, with roof flashings reset so the junction stays watertight. Building control is handled where needed.
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.
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 Corby
How much should I budget for extension pulling away repairs in Corby?
Guide prices for extension pulling away repairs in Corby start from about £590 per junction, including VAT, on East Midlands 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 Corby?
Yes, Corby is covered, along with postcode districts NN17, NN18. We also cover nearby Uppingham and Kettering.
Why do houses in Northamptonshire crack?
Northamptonshire sits largely on Lias clay and Jurassic ironstones and limestones, with historic ironstone quarrying around Corby and Kettering. The clay vales are prone to shrinkage near trees. Only an investigation can say why a particular building has moved.
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.
Is it normal for an extension to crack at the join?
A fine crack at the junction is fairly common, especially in the first few years as a new extension settles. It becomes a concern when the gap is widening, tapering, letting in water or matched by sticking doors and sloping floors. Those signs point to continuing movement.
Related work in Corby
- Boundary and garden wall repairs
- Concrete repairs
- Bowing wall repairs
- Underpinning
- Bay window subsidence repairs
Extension pulling away repairs near Corby
If the junction at your Corby property keeps reopening, send dated photos and we will suggest whether monitoring, a drain survey or a repair comes next.