If you need a chimney rebuild in Cromer, here is exactly what the job involves from the moment we arrive to carry out an inspection through to the day the scaffold comes down.
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The starting point for any chimney rebuild is a close inspection at roof level. A look from the garden with binoculars gives a rough impression, but it cannot tell you how far mortar deterioration extends, whether bricks are hollow or spalled behind the face, or how the lead flashings are performing at the back of the stack. A proper inspection requires scaffold or at minimum a secure roof ladder - and for any job involving significant rebuilding, scaffold is the only safe option.
During the inspection we look at four areas: the brickwork and mortar joints on all four faces, the flaunching and pots at the top, the lead step flashings and back gutter at the roof junction, and the condition of the stack at the point where it meets the roof structure. Each area can deteriorate independently, and the extent of work needed in each one drives the final scope of the job.
We also check whether the stack is plumb. A lean can be subtle - sometimes only a couple of centimetres off true - but even a small lean means the mortar bond within the stack has been compromised and structural work is needed, not just cosmetic repointing.
Once the inspection is complete we can give you a clear breakdown of what the stack actually needs. This might range from a repoint and new flaunching to a partial rebuild of the courses above the roof line, or a full rebuild if the stack has deteriorated too far to save. We will explain what we found, why a particular approach is needed, and what the alternatives are if there are genuine options.
A full chimney rebuild above the roof line on a standard two-storey property typically falls in the range of £1,500 to £3,500. A full stack rebuild - taking the brickwork down further and starting again - can reach £4,000 to £6,000 or more depending on the height of the stack and the complexity of the roof junction. Scaffolding is part of the job and should always be included in any quote you receive; if a contractor proposes to do significant chimney work from a roof ladder, that is a red flag.
Simpler work costs less: a straightforward repoint with new flaunching might be £400 to £900 depending on stack size and access. These are honest typical UK figures - your quote will be based on what is actually there.
Before any rebuild work begins, a scaffold tower or full lift scaffold is erected to give safe working access to the stack and the roof junction around it. The type of scaffold depends on the height of the stack, the roof pitch, and what else needs attention at the same time. A single-stack rebuild on a two-storey house normally requires a scaffold tower with a working platform at ridge height. A taller Victorian stack might need a full independent scaffold.
The working platform needs to be wide enough to store materials - bricks, mortar, tools - safely alongside the working area. We always check that the scaffold is secure before any dismantling or building work starts. On a street-facing elevation in Cromer, scaffold may also require a pedestrian protection fan or sheeting if there is a public footpath directly below.
The dismantling phase is careful, deliberate work. We take the stack down course by course from the top, checking each course as we go. The aim is to identify the point at which the brickwork and mortar are genuinely sound - not just surface-clean but structurally intact. That is the level from which the rebuild starts. Cutting corners here and leaving weakened courses in place below the rebuild is a common cause of repeat problems within a few years.
Old mortar is raked out thoroughly from the courses that remain. Any bricks that are loose, soft, spalled or hollow-sounding are removed and set aside. The remaining brickwork is cleaned back and dampened before new mortar is applied, to prevent the existing brick from drawing moisture out of the new mix too quickly and weakening the bond.
Old flaunching is broken off completely. Old lead flashings are carefully stripped out, with the mortar chases they sit in cleaned back ready for new lead. If the original lead is in good condition and of the correct code weight, it can sometimes be reused, but it is more common to replace it as part of a rebuild.
The rebuild starts from the sound course, working upward in the same bond pattern as the original stack. The most common bond on a chimney stack is English or Flemish bond. Getting the bond wrong - even if the brickwork looks tidy - affects the structural integrity of the stack.
Mortar mix is specified for the brick type. Older, softer bricks need a lime-based mortar that allows the stack to breathe and flex slightly. Harder post-war bricks can take a stronger cement-based mix. Using a rigid cement mix on old soft bricks traps moisture and leads to spalling within a few freeze-thaw cycles.
Where replacement bricks are needed, we source reclaimed or purpose-made facing bricks that match the original as closely as possible in colour, texture and density. On older properties, getting the match right matters both visually and structurally. A well-executed rebuild should be difficult to distinguish from the original once the mortar has weathered.
As the stack rises, perpendicular joints are kept tight and each course is checked for level and plumb before the next is laid. Rushing this stage is what produces a stack that looks lopsided or that develops movement cracks early.
Once the brickwork has reached full height, the pots are reset or replaced. If original pots are undamaged, they are retained. New flaunching is applied around the pot bases in a weathering slope that sheds water away from the stack. The flaunching is worked neatly into the junction between the pot collar and the top course of brickwork and left to cure before any further work disturbs it.
If a flue is no longer in use, a half-round ridge tile capping or a ventilated cap can be fitted instead of an open pot. This keeps birds, rain and debris out of the flue without blocking ventilation entirely, which matters in older properties where the flue serves residual ventilation in the chimney breast.
Fitting new lead flashings is one of the most technically demanding parts of the job. Step flashings are cut into freshly chased mortar joints on the upslope faces of the stack, with each flashing stepped to follow the tile courses below. The lead is dressed flat against the tile face and tucked under the tile above. At the back of the stack, a back gutter is formed in lead, with side flashings lapping over it. The whole assembly is pointed in fresh mortar to seal the chases.
Code 4 lead (1.8mm thick) is the minimum specification for step flashings and soakers. Code 5 (2.24mm) is better practice for the back gutter and any flashing on an exposed roof. Lead that is fitted correctly and of the right code weight has a service life measured in decades rather than years.
Before the scaffold comes down, the finished stack is checked from the working platform. Every joint is inspected, the flaunching is checked for cracking or movement, and the lead is checked to confirm it is sitting flat and the mortar pointing is sound. Any debris from the dismantling - broken bricks, old mortar, stripped lead - is removed from the roof and the scaffold, and the surrounding roof slope and gutters are cleared.
The scaffold is then struck. The whole programme from scaffold-up to scaffold-down depends on the size of the stack and the mortar curing time. In cold or wet weather this can extend slightly, as mortar needs time to cure properly before the next course is laid or before the scaffold is removed.
If your chimney stack needs attention, call us to arrange an inspection. We will come up to roof level, tell you exactly what we find, and give you a clear itemised quote before any work is committed to.
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Call any time. Calls are answered day and night and passed straight to our roofers.
