A damaged or crumbling chimney stack is a safety risk and a source of leaks. We rebuild chimney stacks in Fakenham using the correct mortars, flaunching and flashing to restore a weathertight, structurally sound stack that will stand up to Norfolk winters.
Photo from one of our recent jobs
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A chimney stack takes more punishment than almost any other part of a roof. It stands proud above the roofline, exposed to frost, rain and wind on every face, with no shelter from the main building. Over time, the mortar joints open up, the brickwork spalls and the flaunching around the pots cracks away. When that happens, water gets in, and the damage spreads fast: into the stack itself, down the chimney breast inside the house and out through failed flashings into the roof void below.
Chimney rebuilds are the right answer when repointing alone is no longer enough. If more than a third of the brickwork is damaged, if the stack has moved off plumb, or if the flaunching has lifted away from the pots entirely, rebuilding from a sound course upward is the correct and lasting repair. A patch-and-hope approach on a stack this far gone usually means a second set of costs within a few years.
Every rebuild starts with a scaffold or a safe working platform so the work can be done properly at height. We take the stack down to a stable course of sound brickwork, then rebuild it course by course using a mortar mix suited to an exposed chimney - typically a lime-based or NHL mortar rather than a straight OPC mix, which can be too rigid and cause the surrounding bricks to crack instead of flexing slightly with frost movement.
The chimney pots are either re-set or replaced, and the flaunching is laid fresh around their bases with a good fall to shed water outward. Once the stack is rebuilt, the lead flashings at roof level are dressed back in or replaced entirely. This is a critical junction: the step flashings, back gutter and soakers where the stack meets the roof slope must be properly formed if the job is to stay watertight.
Where a chimney is no longer in use, capping the stack with a vented cap or a purpose-made cover is worth considering at the same time. It stops water ingress while allowing the flue to breathe, which prevents damp rising up through the breast internally.
We take care to source brickwork that matches as closely as possible - no rebuild should look like a patch. On some period properties, reclaimed bricks are the best option. On newer builds or where the stack is not visible from the street, a practical match is usually straightforward.
The lime mortar colour also matters. A bright grey OPC joint on old yellow or red Norfolk brick stands out badly and is not the right material choice anyway. Getting the mix and colour right is part of the job, not an afterthought.
Working at the top of a chimney stack is genuinely hazardous without the right access equipment and training. Beyond the safety issue, the technical side of a chimney rebuild - mortar specification, flashing detailing, pot setting, flaunching falls - is where a poor-quality job fails within one or two winters. Frost is the main enemy: water sits in the wrong place, freezes, expands and opens up new cracks. A correctly built and properly drained stack sheds water before it can do that.
If the chimney serves a working fireplace or stove, the rebuild also gives the right moment to inspect the flue lining. A collapsed or damaged liner is a carbon monoxide risk and a fire hazard. We can flag what we find and advise on next steps - lining a flue is a separate specialist task, but knowing the condition of the liner before the scaffold comes down saves a second visit later.
If you are unsure whether your stack needs a full rebuild or whether repointing will do, a visual inspection from a safe vantage point - or from scaffold already up for other roofwork - will give a clear answer. Do not rely on a view from the ground on a tall stack: the worst deterioration is often on the upper courses and out of sight from street level.
A chimney stack rebuild in Fakenham typically costs between £1,500 and £4,000 depending on the height of the stack, how many courses need to come down and rebuilding, the condition of the existing flashings, and whether new pots are required. Taller stacks on two-storey or three-storey properties cost more because of the access equipment needed. If the lead flashings also need full replacement, allow an additional £300 to £700 depending on the size of the stack and the complexity of the junction detail.
A chimney rebuild in Fakenham costs around £1,500 to £4,000 for most domestic stacks, with scaffold and lead flashing work included in a full job price.
We are based in Fakenham and work on chimneys and roofs across the town and the surrounding villages. If your stack is showing signs of movement, crumbling mortar or failed flaunching, call us to arrange an inspection. We will tell you honestly whether a rebuild is necessary or whether a more limited repair will do the job, and we will give you a clear, itemised price before any work begins.
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