Brick Arch Repair & Leaning Portico Columns – Kent & London
Brick arches are engineering feats dressed in brickwork. They carry load through compression, transferring weight outward to the supporting columns or piers on either side. When that structural balance breaks down, the consequences move fast – from visible cracking to near-total collapse.
Failing brick arches are more common in period properties across South East England than most owners realise. The older the structure, the more likely it has endured decades of water ingress, settlement, and inadequate repair attempts. Left unchecked, the problem compounds.
Why Brick Arches Fail
The arch works by spreading load. The moment its supports – the columns or piers – begin to shift, the arch loses its geometric integrity and starts to spread and drop. This is not cosmetic movement. It is structural.
Surface water is a leading cause. Water penetrates mortar joints, freezes, expands, and widens the gap on every cycle. Over years, this erosion undermines the base of columns and softens the ground bearing beneath them. Add to that the natural settlement of older foundations and you have conditions that make arch failure almost inevitable without intervention.
Previous repair attempts often make things worse. Filling open bed joints with fresh mortar addresses the symptom without touching the cause. It also looks poor against aged brickwork, reducing the property’s kerb appeal and market value simultaneously.
A Failing Portico in Catford, London
This period property in South East London illustrates how quickly the situation can deteriorate. The red brick portico – a key architectural feature of the original design – had developed wide cracks across the arch and column junctions. Someone had attempted to fill these with mortar. The cracks returned, wider than before.
When our surveyors assessed the structure, they found brick columns had shifted up to 3.5cm out of vertical. The portico masonry was pulling away from the main elevation. The arches were actively spreading and dropping under load- the structure was approaching collapse.
The root cause was a combination of long-term surface water damage and insufficient structural capacity in the original columns. They were not strong enough to carry the combined load of the brickwork and roof structure above.
What a Proper Structural Repair Looks Like
Cosmetic pointing does nothing for a failing arch. The only effective approach addresses the underlying structural deficit directly realigning the masonry, restoring load paths, and locking everything in place permanently.
For the Catford property, AWT installed temporary supports to make the structure safe before any repair work began. From there, specialist equipment including precision diamond drilling rigs designed in-house allowed the team to realign the leaning columns without demolition and without damaging the period masonry.
The repair programme included:
- Realigning brickwork using AWT-designed equipment
- Precision diamond drilling for grouted pin installation
- Resin bonded ties to reconnect separated masonry
- Rebuilding columns with internal strengthening steel fixings
- Brick arch repair and lateral restraints
- Resurfacing damaged bricks and replacing where necessary with carefully matched alternatives
- Stonework repairs
Simply rebuilding the columns without addressing their structural inadequacy would have produced the same failure again. The steel fixings installed within the rebuilt columns ensure the repair is permanent, not cyclical.
Why Matching Materials Matters
A brick arch repair that uses the wrong mortar mix or mismatched brick colour creates an instant visual record of where the failure occurred. On a period property, that matters enormously, both aesthetically and in terms of market value.
AWT’s approach uses original bricks wherever possible. Where replacement is unavoidable, bricks are sourced to match the existing stock in colour, texture, and size. Mortar is mixed to replicate the original in both style and tone. The finished repair should be difficult to distinguish from the surrounding masonry.
Brick Arch Repair Across Kent and London
AWT operates across Kent, London, and the wider South East. Whether the structure is a Georgian portico in a London Borough, a Victorian archway in a Kent market town, or a period entrance feature on a rural property, the structural principles and the repair methodology are consistent.
We work directly with homeowners, insurers, structural engineers, loss adjusters, architects, and project managers. Every project receives a full structural assessment before any work begins. In many cases, a preliminary assessment is possible from photographs alone, without an initial site visit.
To arrange a free survey or to send photographs of the defect for initial review, call 01227 721 255, email enquiries@actionwallties.co.uk, or use the contact form on this website.