Wymondham Roofers carries out full chimney rebuilds for homeowners in Bowthorpe, tackling leaning stacks, crumbling brickwork and failed mortar before the problem works its way into the structure of your home.
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A chimney that is leaning, has spalled brickwork, or has mortar joints that have opened up significantly is beyond the reach of a simple repoint. Repointing works well when the bricks themselves are sound and only the mortar has failed. When the masonry has deteriorated, when water has been getting in for long enough to cause internal damp, or when the stack has moved out of plumb, the only lasting answer is a rebuild.
We rebuild chimney stacks using brickwork matched as closely as possible to the original and mortar suited to the age and construction of the property. Lime mortar on older buildings, cement-lime mixes on post-war properties. Getting the mortar type right matters as much as the brickwork itself - hard cement on a lime-mortared stack traps moisture and speeds up decay.
These are the things worth checking from ground level, and the things a roofer will look at closely from the scaffold:
Any one of these on its own warrants an inspection. More than one together suggests the stack has been deteriorating for some time and a rebuild is likely to be more cost-effective than repeated patchwork.
A chimney rebuild means taking the stack down by hand, course by course, to the level where sound brickwork begins. The new stack is then built back up using matched bricks and the appropriate mortar, with new flaunching at the top, the chimney pots re-set or replaced, and the lead flashing dressed and pointed at the base where the stack meets the roof slope.
Scaffolding is required for any chimney work above gutterline. This is not optional - working from a ladder at stack height is not safe and any roofer doing so is cutting corners that will show up elsewhere in the job too.
Cost is one of the first things most homeowners want to understand, and it is the main focus of this page. The honest answer is that chimney rebuild costs vary considerably, but the total cost including scaffolding usually falls between £1,500 and £4,000.
That is a wide range, and the rest of this section explains exactly what moves the figure up or down.
The taller the building and the steeper the roof pitch, the more scaffolding is needed. Scaffolding on a standard two-storey house to reach a single stack typically costs £400 to £900. A three-storey property, or one with a steeply pitched roof where the stack rises well above the ridge, can push scaffold costs to £1,200 or more. Scaffold hire is a fixed overhead regardless of how long the masonry work itself takes, so height has a disproportionate effect on the total.
If only the top two or three courses of brickwork have failed along with the flaunching and pots, the cost is toward the lower end of the range - typically £1,500 to £2,000 including scaffold for this kind of partial rebuild. If the whole stack above roof level needs to come down, or if there are problems with the brickwork below the roofline, the cost rises toward £3,000 to £4,500.
This is the factor that is hardest to estimate without a proper inspection. A roofer who gives you a firm price without getting up to the stack is guessing, and that guess will either be too high (to cover unknowns) or will come with a variation order partway through the job.
On a modern property where standard machine-made bricks were used, sourcing a close match is straightforward and adds little to the cost. On older properties - particularly those built before the 1930s - the original bricks may be handmade, soft-fired, or simply a size or colour that is no longer made. Sourcing reclaimed brick that genuinely matches takes time and costs more. Expect to pay a premium of £200 to £600 for a difficult brick match, sometimes more if a specific batch needs to be tracked down.
Using a visibly mismatched brick is cheaper in the short term but looks poor and can affect the value of the property. It is worth spending the extra to get it right, particularly on the front elevation.
Standard premixed cement-lime mortar is the most economical option and is appropriate for the majority of post-war properties. A properly specified lime mortar for an older building costs more to buy and takes more care in application, adding a modest amount to the overall cost - typically £100 to £300 on a single stack. It is not a luxury: using the wrong mortar type can cause the brickwork to deteriorate faster than it would have done without any intervention at all.
If the existing lead flashing at the base of the stack is in good condition - properly dressed into the mortar joints, no cracks, no lifted sections - it can usually be reinstated as part of the rebuild without extra cost. If it needs to be replaced, new lead flashing for a standard chimney stack costs roughly £300 to £600 for materials and fitting. Old zinc flashings or mortar-only flashings (sometimes called sand and cement flashings) should always be replaced with lead when the scaffold is already up, because the scaffold cost is already being paid and the alternative is returning with scaffold again in a few years.
Many older terraced and semi-detached houses have two stacks - one at the front, one at the back, or one shared with the neighbouring property. If both need attention, the scaffold can sometimes be positioned to cover both, which reduces the overall scaffold cost compared to two separate visits. A twin-stack rebuild will cost more than a single-stack job, but combining the work saves on the overhead costs.
The old brickwork has to go somewhere. On most rebuilds the rubble fills one or two builders' bags, which a decent roofer will include in their quoted price. If a skip is needed (for larger stacks or where the volume of material is high), this adds £200 to £350 depending on size. Check whether waste disposal is included in any quote before you sign off on it.
A chimney that has only just started to deteriorate - perhaps the flaunching has cracked but the brickwork below it is still sound - costs significantly less to put right than one that has been left until water has worked its way down into the upper courses. The difference between a partial rebuild and a full stack rebuild can be £1,000 to £2,000. Inspecting the stack every five years or so, or after any severe weather, is the simplest way to keep rebuild costs manageable over the life of the property.
If you also need ridge tiles repointing, valley repairs, or lead flashing replaced elsewhere on the roof, combining it all into one visit means one scaffold erection rather than two or three. Scaffold costs are the single biggest overhead on chimney work, so sharing that cost across multiple jobs is a genuine saving. Ask whether other roof work needs attention at the same time as the chimney is being inspected.
A like-for-like rebuild using a sensible brick match and the correct mortar type does not need to be expensive in terms of materials. There is rarely any value in upgrading to decorative brickwork, oversized pots, or unnecessary additions to the stack design. Keep the specification close to the original and the material costs stay proportionate.
When you receive quotes for a chimney rebuild, the price difference between contractors can be significant - sometimes several hundred pounds on what looks like the same job. Here is what to check before deciding:
A quote that is significantly cheaper than others often omits scaffolding, uses a mismatched mortar, or does not include an allowance for any variation in the scope once the stack is opened up. A quote that covers all of the above is easier to compare fairly against others, and avoids the unpleasant conversation about extras halfway through the job.
A like-for-like chimney rebuild on a standard domestic property is normally permitted development and does not require planning permission. If the property is listed, or if it is in a conservation area, you should check with the local planning authority before work starts. Alterations that change the height or appearance of the stack significantly may also require consent. Your roofer should be able to advise whether the property is likely to have any restrictions, but the responsibility for checking sits with the owner.
The masonry work on a single stack typically takes two to three days once the scaffold is erected. Including scaffold erection and striking, the total site period is usually four to five working days for a straightforward job. A stack with difficult brick matching or more extensive decay may take longer.
The flue should not be used until the mortar has properly set - typically seven to ten days in dry weather, longer in cold or damp conditions. If you have a wood-burning stove connected to the flue, a sweep and flue inspection before first use after the rebuild is sensible.
Jackdaws and starlings commonly nest in open chimney pots. Active nests cannot legally be disturbed during the nesting season. A capping pot or purpose-made flue cap fitted as part of the rebuild prevents re-entry. Tell the roofer at inspection stage if nesting is suspected, as it affects the scope and timing of the work.
A leaning or visibly crumbling stack will show up in a surveyor's report and is likely to result in a reduction in the offer price or a requirement to carry out the work before exchange. The cost of the rebuild is almost always less than the reduction a buyer's surveyor will attach to the problem. Dealing with it before the property goes to market is generally the more straightforward route.
If you have noticed any of the signs described above on your chimney stack, call Wymondham Roofers to arrange a chimney inspection. We cover Bowthorpe and nearby areas from our base in Wymondham, and we can give you a clear view of what the stack actually needs before any commitment to the work. Do not put it off until the problem is bigger and more expensive - call us to arrange an inspection.
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Call any time. Calls are answered day and night and passed straight to our roofers.
