Cardiff · South Glamorgan
Retaining wall repairs in Cardiff
Retaining wall repairs in Cardiff begin with height and what sits on top. A low wall behind a flower bed is a very different job from one holding up a drive, and the taller or more heavily loaded walls need an engineer’s design.
Guide price from£460per wall inc VAT
- Postcodes
- CF10, CF11, CF24
- Population
- about 370,000
- Area
- South Glamorgan
- Pricing region
- Wales
What is the ground like in South Glamorgan?
Cardiff is in South Glamorgan and takes in postcode districts CF10, CF11, CF24. About 370,000 people live there. We also take enquiries from nearby Penarth (3 miles), Caerphilly (7 miles) and Barry (7 miles).
Parts of South Glamorgan have clay that can shrink near trees in dry spells. Ground movement here is more often linked to soils, drains and trees than to mining. Typical buildings in South Glamorgan: Victorian terraces in Cardiff and Penarth, inter-war semis and post-war estates.
From first photo to finished repair
Photos and measurements
Send photos of the whole wall from the front and the end, so any lean shows, plus close-ups of cracks and weep holes. Tell us roughly how tall it is and what sits at the top, such as lawn, patio, drive or a building.
Engineer’s design
Where the wall needs it, an independent chartered structural engineer is appointed to design the repair or new wall, including footing, thickness, reinforcement and drainage. We can arrange this, and the design forms the basis of the quote.
Written quote
You receive a no-obligation written quote covering demolition, excavation, temporary support, the footing, the new or repaired wall, drainage and spoil removal. It becomes a fixed price in writing once the repair is specified.
Symptoms that point to retaining wall repairs
- Bricks or blocks pushed out of line, or coping stones sliding off
- Water seeping through joints, or white salt staining, after rain
- Wall leaning forward, or bulging out in the middle of its length
Guide prices for retaining wall repairs in Cardiff
Prices in Cardiff are worked out on Wales rates. They include VAT and are a starting point: access, the extent of the damage and whether an engineer or building control is involved all move the figure.
| Item | Guide price | Per |
|---|---|---|
| Minor repairs and drainage | £460 – £1,850 | per wall |
| Structural repair or partial rebuild | £2,750 – £13,800 | per wall |
| New retaining wall | £185 – £415 | per m² of wall face |
Methods for retaining wall repairs
Drainage and minor repairs
Blocked weep holes are cleared or new ones drilled, and where practical a drainage layer is formed behind the wall with an outlet at its base. Loose copings are rebedded, open joints repointed and a few damaged bricks replaced. For a low wall that has not moved much, this can be enough.
Best for: Low walls that are damp or slightly weathered but still upright
Rebuilding on new footings
Where the whole wall is failing, it is replaced with a new retaining wall on a properly sized footing, with free-draining backfill, a membrane, weep holes and a drain at the base. Reinforced blockwork faced in brick or stone is common, so the wall matches its surroundings.
Best for: Walls failing along their length, or retaining significant height
Rules for retaining wall 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.
Frequently asked questions
What is the price of retaining wall repairs in Cardiff?
Guide prices for retaining wall repairs in Cardiff start from about £460 per wall, 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 carry out retaining wall repairs in Cardiff?
Yes, Cardiff is covered, along with postcode districts CF10, CF11, CF24. We also cover nearby Penarth and Caerphilly.
Does the ground around Cardiff cause cracking?
Cardiff is built on Mercia Mudstone, river gravels and alluvium, and the Vale of Glamorgan on Lias limestone and clay. Soft alluvium near the rivers and docks can settle. Only an investigation can say why a particular building has moved.
How long does a retaining wall rebuild take?
Drainage and minor repairs usually take a day or two. Rebuilding a garden retaining wall on new footings typically takes one to three weeks, depending on its length, height, access for digging and any wait for the engineer’s design or inspections.
Can a bulging retaining wall be saved?
Sometimes, if the bulge is small, the wall is low and the cause is mainly poor drainage. Improving drainage and repairing the face may stop further movement. A wall that has bulged a lot, cracked through or moved at its base usually needs that section rebuilding on a proper footing.
More repairs we carry out in Cardiff
Retaining wall repairs near Cardiff
If an engineer has already designed a new retaining wall for your Cardiff property, send the drawings and we will price building it.