When your chimney stack is crumbling, leaning or letting water into your home, Haverhill Roofers carries out full chimney rebuilds for homeowners in and around Great Dunmow.
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A chimney rebuild is not a patch repair. When a stack above the roofline has deteriorated beyond what repointing can fix, the brickwork needs to come down and go back up properly. That means stripping the stack to a sound course of bricks, relaying in fresh mortar, fitting new flaunching at the top to hold the pot in place, and replacing the lead flashings where the chimney meets the roof slope.
Depending on the condition and your preference, we can fit new chimney pots and cowls at the same time. Cowls are worth considering if the flue is no longer in use, because they stop birds nesting and rainwater pooling inside the stack. If the flue is still active, the right cowl choice depends on the fuel type and draw characteristics of the appliance below.
Repointing replaces the mortar between bricks. It is the right job when bricks are sound but mortar joints have eroded. A chimney that needs rebuilding shows different symptoms:
If you are seeing any combination of these, a survey from scaffold height is the only way to know how far the deterioration runs. What looks like surface erosion from the garden can turn out to be several courses of loose or failed brickwork once someone is up close.
Chimney work requires scaffold, height experience and knowledge of both brickwork and lead. It is a job where the difference between a good contractor and a poor one is not always obvious until years later, when water finds its way in through a badly finished flashing or a pot that was never bedded correctly. Asking the right questions before signing anything protects you.
Any contractor who does this work regularly should be able to show you photographs of completed stacks. You are looking for neat, consistent mortar joints, a well-finished flaunching that slopes away from the pot base to shed water, and flashings that sit flat against the brickwork rather than sitting proud or being held with sealant. If they cannot show you examples, that tells you something.
Get the scope of work in writing before you commit. A quote that says "chimney rebuild" could mean very different things to different contractors. Confirm whether the price includes:
Scaffold alone for chimney access typically adds £300 to £700 to the job cost depending on height and access. A quote that seems low may simply have left it out.
This is a detail many homeowners never think to raise, but it matters. Modern chimneys can use a standard sand and cement mix, but older stacks built with soft handmade bricks need a weaker, lime-based mortar. Using a hard cement mortar on soft bricks causes the bricks themselves to crack as the structure moves with temperature changes. A contractor who understands this will tell you unprompted. If they look blank when you ask, be cautious.
Once a stack is rebuilt and the scaffold comes down, you cannot easily inspect the finished work from ground level. Ask whether you will be shown photographs taken from the scaffold before it is struck. A straightforward request, and a confident contractor will have no objection to it.
For any chimney rebuild, getting two or three prices is sensible. You are not necessarily looking for the cheapest; you are looking for a contractor who can explain clearly what they are doing and why, gives you a written breakdown, and does not pressure you into a decision on the day.
For the stack itself, reclaimed or matching bricks are available if the original appearance matters to you. New engineering bricks are harder and more resistant to frost, but they can look noticeably different on an older property. For most rebuilds, a good match to the existing brickwork is achievable with reclaimed stock.
Lead flashing is the standard for chimney-to-roof junctions and remains the most durable option. Code 4 or Code 5 lead is used depending on the pitch and exposure. Correctly fitted lead, dressed into the mortar joints and secured with lead wedges, can last 50 years or more before it needs attention.
Flaunching is usually a sand and cement mix, sometimes with a polymer additive to improve flexibility. The slope of the flaunching matters: it must pitch away from the pot base to drain properly. Flat or concave flaunching holds water and cracks within a few winters.
A partial rebuild of a single-stack above the roofline, including new flaunching and a pot, typically costs £800 to £1,800 depending on the height of the stack, the number of courses being rebuilt, and scaffold requirements. A full rebuild of a larger or more complex stack with new lead flashings will generally fall between £1,500 and £3,500. These are current typical figures for work in this part of the country; your actual cost depends on what your chimney needs once it has been properly assessed.
If you have concerns about a chimney stack at your home in Great Dunmow or the surrounding area, call Haverhill Roofers to arrange a chimney survey. We will tell you honestly whether a repair is sufficient or whether a rebuild is the right course of action.
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Call any time. Calls are answered day and night and passed straight to our roofers.
