Retaining wall repairs in Greater Manchester

Area: Greater Manchester
Pricing region: North West
Ground: Clay in parts
Towns listed: 23

How do local ground conditions affect retaining wall repairs in Greater Manchester?

Parts of Greater Manchester lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. What you mostly find across Greater Manchester: red-brick terraces, mill-town stone terraces, inter-war semis and post-war estates.

What to expect when we carry out retaining wall repairs

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.

Is it time for retaining wall repairs? Common signs

Wall leaning forward, or bulging out in the middle of its length
Bricks or blocks pushed out of line, or coping stones sliding off
Ground cracking or sinking along the top of the wall
No weep holes, or weep holes that never seem to drain

What should you budget for retaining wall repairs in Greater Manchester?

For Greater Manchester we use North West rates. Treat the table as a budget guide, inc VAT; the price you pay is the one on your written quote.

Guide prices inc VAT on North West rates. Items marked est. are our estimates.
Item	Guide price	Per
Minor repairs and drainage	£480 – £1,900	per wall
Structural repair or partial rebuild	£2,900 – £14,400	per wall
New retaining wall	£190 – £430	per m² of wall face

Repair options we may recommend

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

Structural repair and partial rebuild

A leaning or bulging section is taken down, the soil behind dug out and supported, and the wall rebuilt on a new footing with drainage and, where specified, reinforcement tied into the sound wall either side. The engineer’s design sets footing size and wall thickness.

Best for: A section that has moved while the rest stays sound

Retaining wall: drainage behind the wall, weep holes and a proper footing. Indicative drawing, not to scale.

Do you need approval for retaining wall 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.

Towns in Greater Manchester we cover for retaining wall repairs

Your retaining wall repairs questions

Is the ground in Greater Manchester prone to subsidence?

Greater Manchester is mostly glacial till over sandstone and mudstone, with the Lancashire coalfield beneath much of Wigan, Bolton, Salford and parts of the east. Historic mine workings, made ground and old mill sites are common. Parts of Greater Manchester lie on a former coalfield, so a coal mining search is worth checking if movement has no obvious cause. Only an investigation on site can say why a particular building has moved.

How much will retaining wall repairs cost in Greater Manchester?

On North West rates, retaining wall repairs starts from about £480 per wall, including VAT. The written price depends on the extent of the damage, access and whether an engineer or building control is needed.

Do I need an engineer for a retaining wall?

For low walls holding back a planting bed, often not. Walls retaining more than a modest height, often taken as more than about a metre, or supporting a drive, path, building or neighbour’s land, generally need an engineer’s design. An independent chartered structural engineer is appointed where needed, and we can arrange this.

Does home insurance cover a collapsed garden retaining wall?

Often not, because many policies exclude garden walls unless the house is damaged by the same event, and gradual failure is usually excluded. A collapse caused by landslip or a sudden escape of water may be treated differently. Check your schedule and tell your insurer before permanent repairs start.

Is a leaning retaining wall dangerous?

It can be, especially if the lean is getting worse, the wall is tall, or there is a path, drive or building next to it. A wall that has leaned slightly for decades may be stable, but one that has moved recently should be kept clear and assessed soon.