Amersham · Buckinghamshire
Extension pulling away repairs in Amersham
Rear and side extensions are common across Amersham, and so is the crack where new meets old. Usually it reflects the two parts sitting on different foundations, and the first question is whether the gap is still opening.
Guide price from£670per junction inc VAT
- Postcodes
- HP6, HP7
- Population
- about 22,000
- Area
- Buckinghamshire
- Pricing region
- South East
Is Buckinghamshire prone to ground movement?
Amersham is in Buckinghamshire and takes in postcode districts HP6, HP7. About 22,000 people live there. Nearby, we also cover Chesham (2 miles), Gerrards Cross (6 miles) and High Wycombe (6 miles).
Shrinkable clay is widespread in Buckinghamshire. Ground movement here is more often linked to soils, drains and trees than to mining. What you mostly find across Buckinghamshire: market-town terraces, 1930s semis in the south, and large late-20th-century estates in Milton Keynes and Aylesbury.
Signs you may need extension pulling away repairs
- A vertical crack or gap where the extension meets the house
- Extension roof flashing lifting off the original wall
- Daylight or draughts showing through the internal corner joint
How much will extension pulling away repairs cost in Amersham?
For Amersham we use South East rates. Treat the table as a budget guide, inc VAT; the price you pay is the one on your written quote.
| 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 |
Which repair method suits a home in Amersham?
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
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
What happens when we carry out extension pulling away repairs in Amersham?
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.
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.
Extension pulling away repairs in Amersham: questions and answers
How much will extension pulling away repairs cost in Amersham?
Guide prices for extension pulling away repairs in Amersham 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.
Do you cover Amersham?
Yes, Amersham is covered, along with postcode districts HP6, HP7. We also cover nearby Chesham and Gerrards Cross.
Is the ground in Buckinghamshire prone to subsidence?
The Chilterns are chalk with clay-with-flints on the tops, while the Vale of Aylesbury and Milton Keynes sit on Gault, Kimmeridge and Oxford Clays and glacial till. The vale clays are prone to seasonal shrinkage near trees. Only an investigation can say why a particular building has moved.
Who is responsible if a recent extension is moving?
If the extension is recent, the original builder, the designer or building control records may be relevant, and you may have rights against the builder. Gather the plans, completion certificate and contract. Insurance often excludes defects in new construction, so check your policy.
Why is my extension pulling away from my house?
Usually because the extension and the house sit on different foundations that react differently to the ground. Shallow extension footings, leaking drains under the extension, nearby roots and weak tie-ins between old and new walls are the common causes.
Other structural repairs in Amersham
Extension pulling away repairs near Amersham
For a no-obligation written quote to repair an extension pulling away in Amersham, call or send a few photos with a tape measure across the gap.