For homeowners in Horsford with a failing or unused chimney stack, the key decision is whether to repair what is there or take the whole stack down - and getting that call right saves money in the long run.
When a chimney starts showing problems - crumbling mortar, cracked render, damp patches inside, or flashings that keep lifting - there are two routes. You can repair the stack and keep it standing, or you can take it down to below roof level and close the roof over it. Neither option is automatically right. The correct answer depends on the chimney's condition, whether it is still in use, and what you are willing to spend over the next ten to fifteen years.
A properly repaired chimney in reasonable structural condition, serving a working fireplace or stove, is worth keeping. A stack that is redundant, structurally weak, or constantly leaking despite repeated repairs is generally better removed. This page sets out how to work out which situation you are in.
Repair makes sense when the chimney is still connected to a working appliance, the brickwork is structurally sound, and the problem is limited to pointing, flashings or a cap. These are maintenance issues, not fundamental failures.
Repointing the mortar joints on a chimney stack typically costs £300 to £600 for a standard single stack, depending on access and the extent of the work. Replacing lead flashings where the stack meets the roof costs roughly £400 to £800. Fitting a new chimney cap or pot costs £150 to £300. These are reasonable sums if the underlying brickwork is good and the chimney serves a purpose.
A stack that was repointed five years ago and is already showing open joints again is telling you something: either the original repair used the wrong mortar mix, or the structure itself is moving. If a repair needs repeating every few years, repair is no longer the cheaper option.
There are specific conditions where continuing to repair is throwing money at a structure that will keep failing.
Any one of these on its own warrants a proper inspection before you spend more on repairs. Several of them together usually means removal is the more cost-effective route.
A redundant chimney stack - one with no working fireplace or stove below it - has no functional reason to stay up. It requires the same maintenance as an active stack but delivers nothing in return. Over ten years, the cumulative cost of keeping a redundant stack in repair can easily exceed the cost of taking it down once and properly closing the roof.
Removal is almost always worth considering when the stack is no longer in use and any of the following apply: the brickwork is deteriorating, the flashings are failing repeatedly, or you are planning roof work anyway. If scaffolding is going up for another reason, adding a chimney take-down to the same visit significantly reduces the overall cost.
A chimney take-down on a standard residential property, including scaffolding, roof make-good and debris removal, typically costs between £1,200 and £2,500. The upper end of that range applies where access is difficult, the stack is large, or the roof covering needs careful matching. That is a one-off cost with no further maintenance requirement on the removed structure.
Taking a chimney down is not simply knocking it off the roof. The stack is dismantled course by course from the top, with care taken not to drop debris onto the roof tiles or slates below. Once the brickwork is reduced to just below roof level, the roof structure is inspected for any damage caused by old water ingress around the flashings.
The opening in the roof is then framed with new timbers if needed, and the whole area is tiled or slated to match the existing roof as closely as possible. The ridge, if the stack sat at or near it, may need a short section of new ridge tiles bedded in. At the end of the job, the roof should be weathertight and the area of the former stack should be as close to invisible as the available tiles or slates allow.
Internally, the old fireplace breast and flue opening should be capped or sealed at ceiling level. A contractor who takes the stack down and leaves the internal opening unsealed is leaving a route for draughts, birds and pests into the roof void.
There is a third option worth knowing about. Where a chimney is still used occasionally, or where removing the full stack would create a visible gap on a prominent roof slope, it is possible to reduce the stack height rather than remove it entirely. This brings the top of the chimney down to the minimum safe height above the roof, making it less exposed to wind damage and reducing the area of brickwork that needs maintenance.
This is not always the right answer - a very deteriorated stack may still need full removal - but it is worth discussing with a roofer who has actually looked at the structure.
Before committing to either repair or removal, it helps to have a roofer inspect the stack from roof level, not just from the ground. A ground-level look can spot obvious problems but will miss open mortar joints, failed flashings at the back of the stack, or cracked brickwork on the hidden sides.
Ask the roofer to describe the condition of the brickwork at each level of the stack, the state of the lead work where the stack meets the roof, and whether the chimney pot and cap are sound. With that information in front of you, the repair-versus-remove decision usually becomes straightforward.
We carry out chimney inspections, repairs and full take-downs for homeowners in Horsford and nearby villages, working from our base in North Walsham. If you are unsure whether to repair or remove your chimney, call us to arrange a roof-level survey and we will give you a clear assessment of what the structure needs and what each option will cost.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
