What brickwork and repointing work covers
Brickwork work covers a broader range than repointing alone, and most jobs fall into a handful of categories. Repointing renews the mortar joints between bricks once the original pointing has weathered, cracked or been eroded by decades of rain and frost, without touching the bricks themselves unless they're also damaged. Brick repair and replacement deals with individual bricks that have failed, whether from frost damage, general wear or a previous repair using the wrong material, cutting out and replacing them like for like rather than patching over the damage. Structural brickwork repair addresses cracking or movement in a wall, usually working from a structural engineer's specification where the cause relates to subsidence, tree root activity or historic settlement, since diagnosing and calculating the structural cause is outside what we do ourselves. Chimney stack repair covers repointing, brick replacement and flaunching at the top of the stack, an area that takes the worst of London's weather and is often the first part of a house to show deterioration. Garden and boundary wall brickwork is treated with the same care as house elevations, since a freestanding wall has no roof protecting it and often weathers faster than the house itself. Brick cleaning removes staining, paint or biological growth from a facade without damaging the brick face underneath. We survey the brickwork before recommending which of these applies, since jobs that look like they need a full re-point sometimes turn out to be more limited once we're actually up close to the wall.
Lime mortar vs cement mortar: why it matters
The single most important decision in repointing London's older brick stock is mortar type, and it's also the one most likely to be got wrong by someone unfamiliar with period buildings. Victorian and Edwardian houses were built with a soft lime mortar, typically a hydraulic lime such as NHL 3.5 mixed with sand, which is deliberately weaker than the brick itself. That's intentional: lime mortar is porous and slightly flexible, so it allows the wall to breathe and lets any moisture that gets in evaporate back out through the joints rather than through the brick face, and it also acts as a sacrificial layer, wearing and needing renewal over time rather than the brick itself taking the damage. Repointing with a hard, dense cement mortar, common practice for decades before the issue was well understood, reverses this relationship. Cement mortar is stronger and less permeable than the surrounding brick, so moisture that gets into the wall can no longer escape through the joints and instead gets forced through the brick face itself, which is significantly more vulnerable to frost damage than the mortar was ever meant to be. Over years, this shows up as spalling, brick faces cracking and flaking off as trapped moisture freezes and expands within the brick. Once a wall has been repointed in cement, reversing the damage means raking out the hard pointing, which is itself a slow, careful job to avoid damaging brick arrises in the process, and repointing again in an appropriate lime mix. Joint profile matters as much as mix ratio for both appearance and performance. Original Victorian pointing was often a simple flush or slightly recessed joint rather than the raised, ruled joint sometimes applied in later repointing work, and matching the original profile as well as the mortar colour keeps a repointed wall looking consistent with the untouched sections either side of it. We take a sample of sound original mortar where one exists, checking it against the new mix before repointing a visible elevation, rather than guessing at a shade that turns out to look patchy once it's dried and weathered in. We specify lime mortar as standard on solid-wall Victorian and Edwardian brickwork, matched in colour and joint profile to the original.
What drives the cost of repointing and brick repair
Access is usually the biggest single cost factor on a repointing job, since anything above ground floor needs scaffolding, and a full elevation on a three-storey terrace costs more to access than a single chimney stack or a garden wall reachable from a tower or ladder. The extent of repointing needed matters just as much as the area covered: raking out and repointing a whole elevation properly, removing the old mortar to a consistent depth, generally at least twice the joint width, before repacking with new mortar in stages, takes considerably longer than a localised repair to a section that's failed. Brick matching adds cost where individual bricks need replacing, since London stock brick and handmade red brick vary in colour, texture and size between different brickworks and different eras, and sourcing a genuinely close match, sometimes from a reclamation yard rather than a standard builders' merchant, can take longer and cost more than the brick-laying work itself. Mortar mix also affects price, since a specialist lime mortar mixed and matched to an existing joint colour costs more in materials and preparation time than a standard cement mix, though it's the appropriate choice for the wall in most cases on older property. Weather affects both cost and programme too, since lime mortar needs protection from rain and frost while it cures, sometimes meaning hessian sheeting or a temporary cover over scaffolding, which adds time in poor weather windows. As a general guide, a single chimney stack or a small garden wall repair can often be completed within a few days once scaffold or tower access is in place, while a full elevation on a three-storey terrace, including raking out, repair and repointing in stages with proper curing time between passes, more typically runs two to four weeks depending on extent and weather. Where brick replacement is a significant part of the job rather than repointing alone, sourcing a suitable match can itself add lead time before work on site can even begin, so it's worth raising brick matching early rather than close to a planned start date. We survey the brickwork and price by elevation and extent of work needed rather than a blanket day rate, since two outwardly similar terraced houses can need very different amounts of repointing depending on their repair history.
Matching London stock brick and repairing damaged brick
Spalled and frost-damaged brick is one of the most common defects we're asked to repair on London's older housing stock, usually a direct result of a previous cement repointing job trapping moisture that then freezes and expands within the brick face rather than the mortar joint. Where a small number of bricks are affected, we cut them out individually, taking care not to damage surrounding sound brick, and tooth in replacements matched as closely as possible in colour, texture and size. London stock brick, the soft yellow-brown brick used across huge swathes of Victorian London, varies noticeably between different brickfields and different periods of manufacture, so an exact match isn't always achievable, particularly on an older or heavily weathered wall where the surrounding brick has faded unevenly over more than a century. Red brick terraces, common in Edwardian streets and some later Victorian developments, present a similar challenge, since machine-made red brick from a modern supplier rarely matches the tone and texture of handmade or semi-handmade brick from the original period exactly. We're upfront about this before starting a repair, since a slightly visible patch is sometimes the honest outcome of matching an old wall rather than something that can be avoided altogether. Reclaimed brick, sourced from demolition or reclamation yards, often gives a closer match than new brick for both stock and red brick repairs, though availability varies and we'll discuss realistic options once we've assessed the extent of replacement needed and the age and character of the existing wall.
Structural brickwork repairs and when an engineer is needed
Not every crack in a brick wall is structural, and distinguishing a cosmetic or thermal movement crack from one that indicates genuine structural movement is the first step before any repair is priced. A crack that follows a stepped pattern along mortar joints, is wider than a few millimetres, or is actively widening over time, particularly if it's linked to nearby tree activity, clay soil movement or previous underpinning work, needs a structural engineer's assessment before repair work starts, since filling or repointing over a wall that's still moving is only ever a temporary fix that will crack again. We carry out the remedial brickwork itself, rebuilding a section of wall, installing helical wall ties or crack stitching bars where specified, and repointing or rebuilding around a repaired area, but we work from a structural engineer's specification for the actual diagnosis and calculations, since assessing whether movement is historic and stable or ongoing and worsening is a job for someone qualified to make that call, not something we determine ourselves. In the period before an engineer's assessment, it's worth keeping a simple visual record of any crack rather than waiting and hoping it stabilises on its own. A pencil line or a small piece of tape placed across the crack, dated, shows clearly over the following weeks or months whether it's still moving, which is useful information for an engineer to have when they do assess it, and it also gives you an early, low-cost indication of whether the situation is worsening before committing to a full survey. Where a client already has an engineer's report or is dealing with a subsidence claim through their buildings insurer, we're happy to work from that report directly and price the brickwork element of the recommended repair. Where movement looks structural but hasn't yet been assessed, we'll say so plainly and recommend getting an engineer involved before committing to repair work, rather than repointing over a crack that's likely to reopen within a year or two once the underlying movement continues.
Chimney stacks, garden walls and brick cleaning
Chimney stacks take the worst weather exposure of almost any brickwork on a London house, standing above the roofline with no protection and full exposure to wind-driven rain, and they're frequently the first place repointing failure and brick spalling show up. We repoint and repair stack brickwork, renew flaunching, the mortar fillet around the base of the chimney pots that sheds water away from the stack top, and rebuild sections where brick has deteriorated too far to repair in place, coordinating scaffold access with any roofing work happening at the same time where relevant. Garden and boundary walls are built to the same standard as house brickwork but usually weather faster, since they have no roof overhang for protection and often sit closer to ground moisture and vegetation than a house elevation does, and a garden wall showing bulging or leaning, rather than just failed pointing, needs assessing for its footing condition before any repointing is worthwhile. Brick cleaning removes paint, staining, algae or general dirt from a facade, and method matters as much as the result: soft-washing with a low-pressure water and appropriate cleaning solution lifts dirt and biological growth without damaging the brick face, while sandblasting or aggressive high-pressure cleaning strips away the harder, weathered outer surface of an older brick permanently, leaving it more porous and vulnerable to future frost damage. We avoid sandblasting on historic brickwork for this reason and would flag it as a risk to the fabric of the building rather than recommend it, even where it looks like the faster option.