Harrow · Greater London
Brick arch repairs in Harrow
A dropped keystone over a front door is a familiar sight on older streets, in Harrow and beyond, and it rarely fixes itself. We look at whether the arch bricks are sound and whether the wall either side has moved, then recommend the lighter repair where it will work.
Guide price from£500per arch inc VAT
- Postcodes
- HA1, HA2, HA3, HA5, HA6
- Population
- about 260,000
- Area
- Greater London
- Pricing region
- London
How do local ground conditions affect brick arch repairs in Harrow?
Harrow is one of the 32 London boroughs, with around 260,000 residents in districts such as HA1, HA2, HA3, HA5, HA6. Nearby places we cover include Brent (3 miles), Ealing (5 miles) and Borehamwood (5 miles).
Much of Greater London sits on clay that shrinks in dry summers and swells in wet winters. Ground movement here is more often linked to soils, drains and trees than to mining. What you mostly find across Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
How we usually approach brick arch repairs
Rebuilding over a former
A timber former is cut to the arch profile and propped under the opening. The old arch is carefully taken down, bricks cleaned for reuse, and the arch rebuilt over the former with tight joints and a properly set keystone. The former stays until the mortar is strong enough to carry the load.
Best for: Badly dropped arches or ones with loose voussoirs
Reinforcing a sound arch
Where the arch has only dropped slightly and the bricks are sound, stainless helical bars are bonded into the bed joints just above it, extending well into the wall on each side. The bars turn the courses above into a reinforced band of masonry, so the arch no longer has to carry the full load. Joints are repointed to match.
Best for: Slightly dropped or cracked arches with sound bricks
What happens during brick arch repairs, step by step?
Look at the arch closely
Straight-on photos of the arch and the wall either side show us how far it has dropped, whether the bricks are sound and whether the cause seems to be the arch itself or the wall around it.
Support the opening
Props carry the brickwork above, and for a rebuild a former is made to the exact profile of the arch. The window or door frame is protected so it is not asked to carry any load.
Repair the arch
Bars are bonded into the joints above a sound arch, or the arch is taken down and relaid over the former using the original bricks where possible, with matched replacements for any that are damaged.
What to look for before calling about brick arch repairs
- A flat arch that has started to sag into a shallow curve
- Gaps opening between arch bricks at the top or bottom edge
- Mortar falling out of the arch joints after frosty weather
Brick arch repairs prices 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 |
|---|---|---|
| Stitching and reinforcing a sound archest. | £500 – £1,500 | per arch |
| Rebuilding an arch (one side) | £1,100 – £1,600 | per opening |
| Rebuilding an arch (both sides) | £2,250 – £3,250 | per opening |
Rules for brick arch 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.
Questions about brick arch repairs in Harrow
What is the price of brick arch repairs in Harrow?
Guide prices for brick arch repairs in Harrow start from about £500 per arch, 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 brick arch 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.
Can you match the original bricks?
Usually, because most arches are rebuilt with their own cleaned bricks, which is the best match of all. Damaged bricks are replaced with reclaimed or new bricks chosen for size, colour and texture, and the mortar is matched to the surrounding joints.
Why has the middle of my brick arch dropped?
The centre of an arch usually drops because the bricks have lost their wedge, either because the wall at the sides has moved or the mortar has worn away. A rotting timber hidden behind the arch is another common cause. The keystone slipping is the visible result.
More repairs we carry out in Harrow
- Crack stitching
- Roof structure repairs
- Underpinning
- Structural surveys and crack monitoring
- Gable end wall repairs
Brick arch repairs near Harrow
Request a written, no-obligation price for arch repairs in Harrow; every arch is itemised, along with any work needed on the inside face.