When a chimney in Mildenhall needs rebuilding, the materials you choose for the brickwork, mortar, flashings and DPC will determine how long it lasts and how much it costs.
A chimney rebuild is not just about taking down the damaged stack and putting it back up. The choices made about brickwork, mortar mix, lead specification and DPC type will all affect how the finished stack performs over the following decades. Cutting corners on materials is one of the main reasons rebuilt chimneys fail prematurely - and the failure often does not become obvious until water is already getting in.
We rebuild chimneys in Mildenhall and the surrounding area using matching brickwork, correct mortar mixes, properly formed lead flashings and a new DPC. Below we explain each material in plain terms so you know what to look for when getting quotes.
The rebuilt portion of the stack should use bricks that match the original as closely as possible in colour, texture and size. This matters both visually and practically. Old imperial bricks (pre-1970s) are slightly larger than modern metric bricks - using the wrong size produces uneven joints and can look poor. A good roofer will source reclaimed bricks of the right type or use a modern equivalent matched in colour, rather than just grabbing whatever is on the van.
The quality of the brick matters too. Engineering bricks are extremely dense and frost-resistant, but their smooth surface sheds water fast and may not match older domestic brickwork. Standard facing bricks are used on most domestic stacks and are perfectly adequate when the mortar mix is correct. Stock bricks have a characteristic texture and colour that is worth trying to match.
Mortar is the element of a chimney rebuild that causes the most long-term problems when it is wrong. The mix needs to be appropriate for the age of the brickwork it is bonding.
Ask any roofer you approach what mortar mix they intend to use and why. If they cannot answer that question clearly, that tells you something.
Lead is the standard material for chimney flashings in the UK and has been for centuries. It is durable, malleable and performs well around the complex angles where a chimney meets a roof slope. The key variable is the weight (thickness) of lead used, specified in codes.
Lead should comply with BS EN 12588. Correctly installed code 5 lead on a chimney, properly dressed and fixed, should not need replacing for several decades under normal conditions - though no roofer can put a precise number on that because exposure, stack movement and the quality of the workmanship all play a part.
Alternatives to lead exist but have significant drawbacks for chimney work. Lead-free flashings using aluminium or zinc are sometimes offered as a lower-cost option. Aluminium corrodes in contact with mortar if not isolated correctly, and zinc, while more durable, is harder to dress tightly into the raking cut. For a chimney rebuild, lead is the professional standard and the sensible choice.
A DPC is a horizontal barrier built into the stack that prevents moisture from rising up through the masonry. On a chimney rebuild, a new DPC should be installed at or just above the roof level - this is a structural requirement under current building standards, not an optional extra. The DPC is typically a proprietary polypropylene or polyethylene sheet product inserted as a continuous layer across the full width of the stack during the rebuild.
Failing to include a DPC is a false economy. Without it, moisture from the roof-level masonry can track upward and emerge on the chimney breast inside the house.
The pot and its haunching (the mortar fillet that seals it to the top of the stack) are replaced as part of a full rebuild. Standard terracotta pots are durable and weather well. Concrete pots are cheaper but more prone to cracking in frost. If the original pot is in good condition and can be safely lifted off during the rebuild, it can be re-set - saving cost and keeping the original appearance. If it is cracked or the wrong size for the flue, a new pot should be specified.
For unused chimneys, a ventilated cap or a louvred pot can be fitted in place of a standard open pot. This lets the flue breathe without allowing rain straight down the stack - an important detail on a redundant chimney.
Any properly done chimney rebuild requires scaffold - not a ladder and a roof hook. The scaffold should give safe access to the full working area of the stack and the surrounding roof slope. It is almost always a separate item in the quotation and typically costs £300-£700 for a standard domestic chimney, depending on the height and configuration. Be cautious of any roofer who proposes to carry out a full chimney rebuild without scaffold.
A chimney rebuild in Mildenhall on a typical two-storey property, taking the stack down to just above the flashing line and rebuilding with new lead flashings and a DPC, generally falls in the range of £1,500 to £3,500 all in. Larger stacks, taller properties, reclaimed brick sourcing or complex flashing geometry will push the cost higher. Always get a written breakdown so you can compare quotes on a like-for-like basis.
We are based in Ely and carry out chimney rebuilds across the local area, including Mildenhall, Ely, Stretham and further into Cambridgeshire. If you have questions about materials or want a roof survey before committing to anything, call us and we will give you a plain answer.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
