Harrow · Greater London
Concrete repairs in Harrow
A crumbling balcony edge at a Harrow property is rarely just cosmetic. It is usually a sign of rusting steel inside, and the sooner it is repaired, the less concrete has to be broken out and rebuilt.
Guide price from£105per m² inc VAT
- Postcodes
- HA1, HA2, HA3, HA5, HA6
- Population
- about 260,000
- Area
- Greater London
- Pricing region
- London
Is Greater London prone to ground movement?
Harrow is one of the 32 London boroughs, with around 260,000 residents in districts such as HA1, HA2, HA3, HA5, HA6. We also take enquiries from nearby Brent (3 miles), Ealing (5 miles) and Borehamwood (5 miles).
Greater London is one of the parts of the UK where clay soils are most likely to move with the seasons. Ground movement here is more often linked to soils, drains and trees than to mining. Typical buildings in Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
Is it time for concrete repairs? Common signs
- Hollow sound when the surface is tapped with a hammer
- Chunks or flakes of concrete breaking away from edges and soffits
- Rust-coloured stains or streaks running down the concrete surface
What should you budget for concrete repairs in Harrow?
These are guide prices for Harrow, using London rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.
| Item | Guide price | Per |
|---|---|---|
| Concrete patch repair | £105 – £225 | per m² |
| Crack injection | £225 – £600 | per metre |
| Small jobs (minimum visit)est. | £560 – £1,100 | per visit |
Repair options we may recommend
Recasting or strengthening
Where steel has lost much of its section, or a lintel or canopy is too far gone to patch, the element is propped and rebuilt, replaced or strengthened to an engineer’s design. It is less common, but sometimes the more lasting option for small canopies and old precast lintels.
Best for: Badly corroded lintels, canopies and balcony edges
Crack injection
Cracks are sealed at the surface, then a low-viscosity resin is injected under pressure through ports until it fills the crack. A rigid resin bonds the two faces back together, while a flexible one seals live cracks against water. The choice depends on whether the crack is still moving.
Best for: Cracks letting water in, or splitting a slab or beam
What to expect when we carry out concrete repairs
Photos and a description
Send photos of the damage close up and from a distance, plus the whole balcony, canopy or elevation. Tell us roughly how old the building is and whether anything has fallen, so we can judge whether to make it safe first.
Written quote
You receive a no-obligation written quote setting out the estimated area of patching, the length of crack injection, coatings and access. It becomes a fixed price in writing once the repair is specified, with any re-measure terms stated clearly.
Break out, repair, protect
Damaged concrete is cut back to sound material, steel cleaned and primed, and the section rebuilt and cured. Cracks are injected, then the surface is coated and drainage details put right so water runs off rather than sitting.
Rules for concrete repairs in England
Like-for-like repairs such as crack stitching and repointing do not usually need building control approval in England, but anything that changes or strengthens the structure, such as underpinning or rebuilding a wall, does. If the work touches a party wall, the Party Wall etc. Act 1996 may apply.
Your concrete repairs questions
What is the price of concrete repairs in Harrow?
Guide prices for concrete repairs in Harrow start from about £105 per m², including VAT, on London rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you carry out concrete repairs in Harrow?
Yes, Harrow is covered, along with postcode districts HA1, HA2, HA3, HA5. We also cover nearby Brent and Ealing.
Does the ground around Harrow cause cracking?
Most of Greater London sits on London Clay, among the most shrinkage-prone ground in the UK, with river gravels along the Thames. Subsidence claims here are among the most frequent in the country, especially after dry summers and near street and garden trees. Only an investigation can say why a particular building has moved.
Do you repair concrete on blocks of flats?
Yes, we repair concrete on houses, flats and small commercial buildings, including balconies, walkway edges, canopies and lintels. For flats, the freeholder, managing agent or owners’ association normally instructs the work. We can price to an engineer’s schedule where one has been prepared.
Why does concrete crack and rust?
Concrete cracks as it shrinks, moves with temperature or carries more load than intended. Steel inside it rusts when carbonation or salts reach it and moisture gets in. The two feed each other: cracks let water in, and rusting steel expands and cracks the concrete further.
More repairs we carry out in Harrow
- Gable end wall repairs
- Roof structure repairs
- Wall tie replacement
- Boundary and garden wall repairs
- Structural surveys and crack monitoring
Concrete repairs near Harrow
Managing a block in Harrow with tired concrete balconies? Send photos or an engineer’s schedule, and we will price the repairs balcony by balcony.