Merthyr Tydfil · Mid Glamorgan
Extension pulling away repairs in Merthyr Tydfil
If the corner joint in your Merthyr Tydfil extension keeps splitting after you fill it, something is still moving. Measuring the gap over a few months, with dated photos, gives an engineer the evidence to recommend the right repair.
Guide price from£550per junction inc VAT
- Postcodes
- CF47, CF48
- Population
- about 44,000
- Area
- Mid Glamorgan
- Pricing region
- Wales
How do local ground conditions affect extension pulling away repairs in Merthyr Tydfil?
Merthyr Tydfil, Mid Glamorgan: about 44,000 residents across postcode districts CF47, CF48. We also take enquiries from nearby Aberdare (4 miles), Mountain Ash (4 miles) and Rhondda (7 miles).
Parts of Mid Glamorgan have clay that can shrink near trees in dry spells. Historic coal workings are recorded beneath parts of Mid Glamorgan, and a coal mining search is worth checking where movement is unexplained. Housing stock in Mid Glamorgan: Long stone and brick terraces on valley sides, Victorian houses in Bridgend 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
- Floor level dropping where the extension and house floors meet
- Extension roof flashing lifting off the original wall
- Daylight or draughts showing through the internal corner joint
Extension pulling away repairs prices in Merthyr Tydfil
Guide prices below are for homes in Merthyr Tydfil, on Wales 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. | £550 – £1,850 | per junction |
| Movement joint and making goodest. | £370 – £1,100 | per junction |
| Underpinning the extension where needed | £920 – £2,300 | 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
Rules for extension pulling away repairs in Wales
In Wales, the Welsh version of the Building Regulations applies. Underpinning and other work that alters or strengthens the structure needs building control approval and inspection; like-for-like repairs often do not. The Party Wall etc. Act 1996 applies to work on party walls and excavation close to a neighbour’s foundations.
Questions about extension pulling away repairs in Merthyr Tydfil
How much will extension pulling away repairs cost in Merthyr Tydfil?
Guide prices for extension pulling away repairs in Merthyr Tydfil start from about £550 per junction, including VAT, on Wales rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you cover Merthyr Tydfil?
We do. Merthyr Tydfil and the surrounding area are covered, including nearby Aberdare and Mountain Ash. A free initial assessment from your photos is the first step.
Is the ground in Mid Glamorgan prone to subsidence?
Mid Glamorgan lies on the South Wales coalfield, with dense historic workings, spoil tips and steep valley sides. Landslip, retaining walls and mining legacy are all live issues in the valleys. Only an investigation can say why a particular building has moved.
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.
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.
Other structural repairs in Merthyr Tydfil
- Retaining wall repairs
- Resin injection ground stabilisation
- Brick arch repairs
- Structural crack repairs
- Bowing wall repairs
Extension pulling away repairs near Merthyr Tydfil
Call about the cracked extension junction at your Merthyr Tydfil property; a free initial assessment first, then a fixed written price once the repair is specified.