Farnham · Surrey
Chimney stack repairs in Farnham
On older houses around Farnham, 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£560per stack inc VAT
- Postcodes
- GU9, GU10
- Population
- about 37,000
- Area
- Surrey
- Pricing region
- South East
Why does the ground in Surrey matter for chimney stack repairs?
We cover Farnham and its postcode districts GU9, GU10, part of Surrey, with a population of roughly 37,000. If you are just outside Farnham, we also cover Aldershot (3 miles), Fleet (5 miles) and Farnborough (6 miles).
Much of Surrey sits on clay that shrinks in dry summers and swells in wet winters. Ground movement here is more often linked to soils, drains and trees than to mining. Typical buildings in Surrey: Victorian and Edwardian villas, 1930s semis and detached houses in the commuter towns, and post-war estates.
Symptoms that point to chimney stack repairs
- A stack visibly leaning when you look along the roof ridge
- Damp patches on the chimney breast inside, especially after rain
- Chimney pots that are loose, tilted or cracked at the base
Guide prices for chimney stack repairs in Farnham
These are guide prices for Farnham, using South East rates and including VAT. Your written quote follows photos or a survey, and is fixed once the repair is specified.
| Item | Guide price | Per |
|---|---|---|
| Repointing, flaunching and minor brick repairs | £560 – £2,250 | per stack |
| Partial or full stack rebuild | £3,350 – £11,200 | per stack |
| Stack restraint or strappingest. | £450 – £1,350 | per stack |
Methods for chimney stack repairs
Flaunching and pot resetting
Old cracked flaunching is broken out, pots are lifted and reset or replaced, and new flaunching is formed to a fall so water runs off. Unused flues can be capped with ventilated caps, which keeps rain out while letting the flue breathe.
Best for: Loose pots and cracked mortar at the top of the stack
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
From first photo to finished repair
Look from the ground
Photos from the street and garden, ideally with a zoom, show us the lean, the pots, the flaunching and the state of the pointing. Damp patches inside are worth photographing too, as they help trace the route water is taking.
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.
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 Farnham?
Guide prices for chimney stack repairs in Farnham start from about £560 per stack, including VAT, on South East 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 Farnham?
Yes. We take enquiries from across Farnham, including GU9, GU10, and from nearby places such as Aldershot and Fleet. Send photos for a free initial view and we will tell you what happens next.
Does the ground around Farnham cause cracking?
North Surrey sits on London Clay, the south on Weald Clay, with chalk along the North Downs and sands in the west. Large gardens with mature trees on clay make seasonal subsidence a familiar problem. Only an investigation can say why a particular building has moved.
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.
What if a chimney breast below has been removed?
Where the breast has gone but the stack is still on the roof, how that stack is now held up is a structural question. Cracking in nearby ceilings or a dropped stack are warning signs. An independent chartered structural engineer should assess it before any repair, and we can arrange one.
More repairs we carry out in Farnham
- Brick arch repairs
- Subsidence repairs
- Structural surveys and crack monitoring
- Lintel replacement
- Underpinning
Chimney stack repairs near Farnham
Send zoomed photos of the chimney stack at your Farnham home, from the street and the garden, for a free initial assessment.