St Austell · Cornwall
Chimney stack repairs in St Austell
On older houses around St Austell, many stacks lean slightly away from the prevailing weather. That is usually sulphate attack in the mortar, and the repair depends on how far the stack has moved and how sound the brickwork still is.
Guide price from£515per stack inc VAT
- Postcodes
- PL25
- Population
- about 24,000
- Area
- Cornwall
- Pricing region
- South West
Is Cornwall prone to ground movement?
Postcode districts PL25 cover St Austell, a Cornwall town of about 24,000 people. Nearby, we also cover Bodmin (9 miles), Truro (13 miles) and Newquay (14 miles).
Shrinkable clay is less common in Cornwall than in south-east England. Old metal-mine shafts and workings are recorded in places, so mining searches are routine for some properties. Typical buildings in Cornwall: Granite and slate-stone cottages, cob buildings, Victorian terraces and post-war estates.
From first photo to finished repair
Scaffold to the stack
Safe access is set up with a working platform around the stack. On terraces we may need to agree access over a neighbour’s roof, and a council licence is arranged where the scaffold stands on the pavement.
Repair, restrain or rebuild
The agreed work is carried out: repointing, new flaunching and pots, restraint, or taking the stack down and rebuilding it. Lead flashings where the stack meets the roof are checked and renewed if needed.
Weatherproof and clear
Caps or cowls are fitted where agreed, the roof around the stack is checked for slipped tiles, and debris is cleared from gutters. You receive photos of the finished stack taken from the scaffold, since it is hard to see from the ground.
Symptoms that point to chimney stack repairs
- Cracked or missing flaunching around the top of the stack
- Damp patches on the chimney breast inside, especially after rain
- A stack visibly leaning when you look along the roof ridge
Guide prices for chimney stack repairs in St Austell
Prices in St Austell are worked out on South West rates. They include VAT and are a starting point: access, the extent of the damage and whether an engineer or building control is involved all move the figure.
| Item | Guide price | Per |
|---|---|---|
| Repointing, flaunching and minor brick repairs | £515 – £2,050 | per stack |
| Partial or full stack rebuild | £3,100 – £10,300 | per stack |
| Stack restraint or strappingest. | £410 – £1,250 | per stack |
Methods for chimney stack repairs
Repointing and brick repairs
Eroded joints are raked out and repointed in a mortar suited to the brick, often a lime-based mix on older stacks. Spalled or cracked bricks are cut out and replaced with matched reclaimed or new bricks. On many stacks this, with new flaunching, is all that is needed.
Best for: Upright stacks with weathered joints and some damaged bricks
Partial or full rebuild
Where the lean is pronounced or the brickwork is badly decayed, the stack is taken down to sound masonry, often to roof level, and rebuilt plumb with new flashings and flaunching. Original bricks are cleaned and reused where possible to keep the appearance.
Best for: Badly leaning or decayed stacks
Rules for chimney stack repairs in England
In England, underpinning and other work that alters or strengthens a wall or foundation is building work under the Building Regulations (Part A, structure), so building control approves and inspects it. Like-for-like repairs often are not, and we tell you which applies before a price is agreed. Work to a party wall, or excavation close to a neighbour’s foundations, can also need a notice under the Party Wall etc. Act 1996.
Frequently asked questions
What is the price of chimney stack repairs in St Austell?
Guide prices for chimney stack repairs in St Austell start from about £515 per stack, including VAT, on South West rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you carry out chimney stack repairs in St Austell?
We do. St Austell and the surrounding area are covered, including nearby Bodmin and Truro. A free initial assessment from your photos is the first step.
Does the ground around St Austell cause cracking?
Cornwall is mostly granite and slate with little shrinkable clay, so clay subsidence is less common than in the south-east. Historic tin and copper mining has left shafts and workings in places such as Camborne and Redruth, and mining searches are routine there. Only an investigation can say why a particular building has moved.
Should I remove my chimney stack instead of repairing it?
It depends on whether you use the flue, the stack’s condition and how it relates to the house next door. Taking a stack down below the roofline changes the structure and the roof, and on a terrace it can affect your neighbour. We can price both options.
Is a leaning chimney dangerous?
A leaning chimney can become dangerous, because stacks are heavy and stand high above the roof. A slight, long-standing lean may be stable for now, but a lean that is worsening, or loose bricks and pots, should be looked at quickly. Keep people away from below if anything looks loose.
More repairs we carry out in St Austell
- Subsidence insurance claim repairs
- Structural surveys and crack monitoring
- Roof structure repairs
- Wall tie replacement
- Crack stitching
Chimney stack repairs near St Austell
Each part of a St Austell chimney job, scaffold included, is itemised in our no-obligation written quote so you can see where the cost lies.