Chimney Repairs Services | Mayo & the Northwest
Chimney Repairs
Repointing, Flashing, Cowls & Structural Work
Your chimney takes the full force of every Atlantic storm that rolls in off the west coast. Rain drives against it from all sides. Frost splits the mortar in winter. Gales work loose the flashing where the stack meets the roof. And month by month, year by year, the tallest and most exposed part of your house slowly breaks down. We’re North West Property Solutions, based in Castlebar, and we specialise in chimney repairs across Mayo, Sligo, Leitrim, and Roscommon. Repointing crumbling mortar joints. Replacing failed lead flashing. Fitting new chimney pots and cowls. Repairing cracked render on the stack. And where a chimney has become structurally unsound, we stabilise it before it becomes a danger to the roof and the people below. Every chimney we repair is done from proper access – scaffolding or a mobile tower, never off ladders – and every repair is built to withstand the wet-dry-freeze cycle that makes chimney maintenance a recurring issue on Irish homes. Your chimney is the first thing the weather hits and the last thing anyone looks at. We make sure it stays standing, stays dry, and stays safe.
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- Based in Castlebar, Co. Mayo
Trusted property maintanence & roofers across Mayo, Sligo, Leitrim & Roscommon
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What Goes Wrong with Chimneys on Irish Homes
Chimneys are the most exposed part of any house. In Ireland, that means they take the brunt of Atlantic rain, gale-force winds, and freeze-thaw cycles that attack the mortar, the flashing, and the brickwork itself. If you can see a problem from the ground, it’s already worse than it looks from up close.
Complete Chimneys Cleaning Solutions
Leaking Chimney Flashing
Lead flashing is the waterproof seal between your chimney stack and the roof. It sits in the mortar joints and folds over the roof tiles or slates, directing rainwater away from the join. When the flashing fails – because the lead has split, the mortar holding it has crumbled, or wind has lifted it – water runs straight down the outside of the chimney and into the roof space. The first sign is usually a damp patch on the ceiling in the room below the chimney, or water staining on the chimney breast in the attic. By the time you see the stain indoors, the flashing has been leaking for weeks or months. We strip out the old flashing, cut new lead to the exact profile of your chimney and roof, and secure it into fresh mortar joints that won’t crack in the next frost. Lead, properly fitted, will outlast the roof itself.
Cracked or Missing Chimney Pots
The chimney pot sits on top of the stack and does two jobs: it improves the draw on the flue by accelerating the airflow, and it stops rain from pouring straight down the chimney into the fireplace. A cracked pot lets water into the flue – and from there into the chimney breast, the fireplace, and sometimes the walls on either side. Pots crack from the same freeze-thaw action that damages the mortar. They also get knocked by falling branches in storms, and some simply fail through age – many houses in the northwest still have their original pots from the 1950s or earlier. A missing or badly cracked pot is a direct route for rain into your home. We can match and source replacement pots to suit the age and style of your house, or fit modern ventilated terminals if you prefer. The pot is bedded on fresh mortar and flaunched to shed water properly.
Birds Nesting in the Chimney
An uncapped chimney is an open invitation to jackdaws. They build nests in the flue, block the airflow, and create a fire hazard if you use the fireplace. Even if the fireplace isn’t in use, a bird nest in the chimney traps moisture, harbours mites, and blocks ventilation through the flue. The chimney breast stays damp because the flue can’t breathe. The fix is straightforward: we remove the nest (outside of nesting season where possible), check the flue for any damage, and fit a chimney cowl or bird guard that keeps the birds out permanently while maintaining ventilation. A properly cowled chimney is a protected chimney.
Complete Chimneys Cleaning Solutions
Crumbling Mortar and Eroded Pointing
The mortar between the bricks or stone of your chimney stack is the first thing to go. Atlantic rain soaks into the surface of the mortar. In winter, that water freezes and expands, cracking the mortar from the inside. Then it thaws, fills with more water, and freezes again. After ten or twenty of these cycles in a single Irish winter, the mortar is reduced to sand and the joints are open to the weather. You’ll notice a few things from the ground: gaps between the bricks, bits of mortar in the gutter, or the chimney looking generally rough and uneven. Once the pointing goes, water gets behind the bricks, rusts the wall ties if there are any, and starts attacking the brickwork itself. Chimney repointing isn’t a cosmetic job – it’s the structural defence that stops your chimney from becoming a pile of loose bricks held together by nothing but habit. We rake out the failed mortar to a proper depth, then repoint with a sand-and-cement mix that matches your existing colour and is graded for full weather exposure.
Damp Chimney Breast
If the wall in your bedroom or living room – the chimney breast – feels cold and damp to the touch, or the wallpaper is peeling, or there’s a tide mark spreading down from the ceiling, the problem is almost certainly the chimney. Water is getting in at the top – through failed flashing, porous rendering on the stack, cracked mortar joints, or a combination of all three – and travelling down through the brickwork to appear on the inside wall. The telltale sign is that the damp is worse after heavy rain and improves slightly in dry weather. It never fully dries out, though, because the chimney bricks act like a sponge, holding moisture and releasing it slowly into the room. The fix is up on the roof: repair the stack, seal the render, renew the flashing, and sometimes fit a ventilated cowl to improve airflow through the flue and speed up drying. Once the water stops coming in at the top, the chimney breast will dry out – but it can take several months for the brickwork to release all the stored moisture.
Gutter Exteriors Streaked with Dirt and Algae
The outside face of uPVC gutters and downpipes collects algae, dirt, and staining just like any other exterior surface. On white or light-coloured guttering, the black streaks and green patches stand out and make the whole house look neglected – even if the gutters themselves are working perfectly. Soft washing the exterior of your guttering restores the clean white finish without the risk of high-pressure water getting behind the gutter joints or forcing water under the roofline. It’s a small detail that makes a big difference to the overall appearance of the property.
Chimney Repair Services - What We Do
Chimney repair isn’t one job – it’s a set of related repairs that all interact with each other. Fix the flashing without repointing the mortar, and the water finds another way in. Replace the pot without checking the render, and the stack still leaks. We approach every chimney as a complete system. All our chimney repair services cover Mayo, Sligo, Leitrim, and Roscommon.
Chimney Repointing
Repointing is the most common chimney repair we carry out in the northwest. Mortar exposed to Atlantic weather erodes faster than anywhere else in the country – the constant wetting and drying, the winter frosts, the salt-laden wind near the coast all accelerate the breakdown. We rake out the failed mortar joints to a minimum depth of 25mm, clean out the dust and loose material, and repoint with a cement-rich mortar mix that is graded for full weather exposure. The mix is tinted to match your existing pointing colour so the repair blends in with the age and character of the house.
Common issues
- Full mortar rake-out to 25mm depth
- Weather-grade sand & cement mix
- Colour-matched to existing pointing
- Brick replacement where spalled
Chimney Pot Replacement
Whether you need to replace a cracked original pot on a 1930s cottage or fit a modern ventilated terminal on a 1980s bungalow, we source pots that match the scale and style of your chimney. We remove the old pot, clean up the flaunching (the mortar bed that holds the pot in place), check the flue opening for any brick damage, and bed the new pot on fresh sand-and-cement flaunching that is shaped to shed water away from the pot. Where visible from the ground, we make sure the pot sits straight, looks balanced, and complements the roofline.
Common issues
- Pot matched to house style
- Fresh sand & cement flaunching
- Weatherproof profile finish
- Cowl fitting if needed
Render Repair on Chimney Stacks
Many chimneys in the northwest – particularly on houses built between the 1960s and 1990s – have a rendered finish on the stack above the roofline. That render is constantly exposed to wind-driven rain on all four sides, and when it cracks or blows, water gets behind it and sits against the brickwork. You’ll see the render bulging, cracking, or falling away in patches. Sometimes the whole render coat needs to be stripped and replaced; sometimes it’s just a repair to a section that has failed. We use a render mix that is appropriate for full weather exposure – stronger than standard wall render, with waterproofing additives where needed – and finish it to match the existing texture and colour.
Common issues
- Weather-grade render mix
- Waterproofing additives
- Texture & colour matched
- Full or patch repair
Lead Flashing Replacement
Lead flashing is the junction between the chimney and the roof, and it’s the most common point of failure on any chimney stack. We cut new code 4 or code 5 lead to the exact profile of your chimney, stepped into the brickwork joints on all four sides where the stack passes through the roofline. The lead is dressed tight to the chimney and lapped correctly over the roof covering – slates or tiles – so that water runs off the chimney, onto the flashing, and down the roof without ever finding a gap.
Common issues
- Code 4 or code 5 lead
- Stepped into brickwork joints
- Lead soakers where needed
- All four sides of the stack
Cowl Fitting
A chimney cowl is a ventilated cap that fits over the top of the chimney pot. It does three things: stops rain from driving straight down the flue, prevents birds from nesting in the chimney, and in windy conditions, improves the draw on the flue so the fireplace burns better and smokes less. We fit cowls to both active chimneys (those with a working fireplace or stove) and disused chimneys. For disused chimneys, a ventilated cowl keeps the rain and birds out while allowing airflow through the flue – which is essential for keeping the chimney breast dry and preventing damp from building up inside the wall.
Common issues
- Stainless steel or terracotta
- Mechanical fixings
- Anti-downdraught options
- Active or disused chimneys
Structural Stabilisation
When a chimney stack has been neglected for too long, the mortar has largely gone, the bricks have started to shift, and the stack is visibly leaning or bowing, the repair moves from maintenance into structural work. We’ll assess whether the stack can be rebuilt in situ – by taking down the loose material and rebuilding the upper section – or whether a partial rebuild is needed. In extreme cases where the stack is beyond repair, we can reduce the chimney height to below the roofline and roof over the opening, or rebuild the full stack from the roofline up. Every structural chimney repair is done with proper access scaffolding, proper materials, and proper time.
Common issues
- Full structural assessment
- Partial or full rebuild
- Proper access scaffolding
- Chimney sweep coordination
Our Services
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AREAS WE SERVE
Chimney Repairs Across the Northwest
We’re based in Castlebar, Co. Mayo, and we provide professional chimney repair services across all four counties of the northwest. If your county is listed below, we cover it. We travel with full scaffolding and all materials, so we arrive ready to work.
County Mayo
Castlebar, Westport, Ballina, Claremorris, Ballinrobe, Swinford, Ballyhaunis, Knock, Kiltimagh, Foxford, Newport, Louisburgh, Belmullet, Achill, Crossmolina, Charlestown, and all surrounding rural areas.
County Leitrim
Carrick-on-Shannon, Manorhamilton, Mohill, Drumshanbo, Ballinamore, Kinlough, Dromahair, and all surrounding areas.
County Sligo
Sligo Town, Tubbercurry, Ballymote, Collooney, Strandhill, Enniscrone, Easkey, Coolaney, Grange, and all surrounding areas.
County Roscommon
Roscommon Town, Boyle, Castlerea, Ballaghaderreen, Strokestown, Elphin, Frenchpark, and all surrounding areas.
Chimney Repair Costs - A Straight Guide
Every chimney is different height, access difficulty, extent of deterioration, number of repairs needed, and whether scaffolding is already on site for other work all affect the final price. But here’s what you can expect, so you’re not going in blind.
What Affects the Price
Height and access
A single-storey chimney on a bungalow is straightforward to scaffold and work on. A two-storey chimney on a detached house needs more scaffolding and more time. A chimney on a three-storey house or a steep roof pitch adds more cost again. We’ll tell you the access requirements with your quote.
Extent of deterioration
A chimney that needs four sides repointed is a straightforward job. A chimney where the mortar has gone, the flashing has split, the render is blown, and the pot is cracked is a much bigger job. The more that needs doing, the more time and materials it takes.
Type of repair
Repointing is labour-intensive but uses relatively inexpensive materials. Lead flashing replacement involves material cost (lead is priced by weight) as well as skilled labour to cut and dress it. Structural rebuilds are at the higher end because they involve demolition, rebuilding, and often new bricks or stone.
Scaffolding
Scaffolding is a significant part of any chimney repair cost. A basic chimney scaffold for a bungalow might be €300 to €500. For a two-storey house with a tall stack, it can be €500 to €900. If scaffolding is already up for other work roof repairs, for example the chimney work can share that cost and the overall price comes down.
Combined work
If you’re having roof repairs or guttering replacement done at the same time, we coordinate the scaffolding and the work sequence. The combined cost is lower than doing each job separately because the access is shared.
Rough Guide (Indicative Only)
| Job Type | Typical Range |
|---|---|
| Chimney repointing - one face of stack (partial) | €200 - €350 |
| Chimney repointing - full stack, all four sides (bungalow) | €400 - €700 |
| Chimney repointing - full stack, two-storey house | €600 - €1,000 |
| Lead flashing replacement - one side | €200 - €400 |
| Lead flashing replacement - all four sides (bungalow) | €400 - €700 |
| Lead flashing replacement - all four sides (two-storey) | €600 - €1,000 |
| Chimney pot replacement (supply and fit) | €200 - €450 |
| Cowl fitting - standard ventilated cowl (supply and fit) | €100 - €200 |
| Cowl fitting - specialised anti-downdraught or H-pot | €200 - €400 |
| Render repair - chimney stack (patch repair) | €150 - €350 |
| Render repair - full chimney render strip and re-coat | €400 - €800 |
| Structural stabilisation - partial rebuild of top section | €500 - €1,200 |
| Structural stabilisation - full stack rebuild from roofline | €1,200 - €2,500 |
| Full chimney overhaul - repoint, flashing, pot, cowl, render (bungalow) | €1,000 - €2,000 |
| Full chimney overhaul - two-storey house | €1,500 - €3,000 |
These are indicative ranges only and include scaffolding, materials, labour, and waste removal. Every property gets a proper inspection and a fixed written quote before any work starts. Prices include VAT.
Frequently Asked Questions
Chimney Repair Questions We Answer Every Week
How do I know if my chimney needs repointing?
Look at the chimney from the ground with binoculars or take a photo on your phone and zoom in. You’re looking for gaps in the mortar between the bricks or stones – dark lines, missing sections, or joints that look recessed compared to the brick face. You might also see bits of mortar in the gutter or on the ground below the chimney. From inside the roof space, look for daylight coming through the chimney brickwork – that means the mortar has failed all the way through. If the chimney looks rough, uneven, or has plants growing out of the joints, the pointing is almost certainly in trouble. The only way to know for sure is to have the chimney inspected up close, which we do as part of a free site assessment. Repointing isn’t urgent in the way a leaking flashing is, but it gets progressively worse and more expensive to fix the longer it’s left.
What causes chimney flashing to leak?
Chimney flashing fails for three main reasons in Ireland. First, the mortar that holds the flashing into the brickwork joints dries out, cracks, and crumbles – exactly the same freeze-thaw process that attacks the pointing on the rest of the chimney. When the mortar goes, the lead is no longer secured and wind can lift it. Second, the lead itself can split from thermal expansion and contraction – lead expands and contracts with temperature changes, and after decades of this movement, it can develop cracks at the fold points. Third, poor original installation – flashing that wasn’t stepped deep enough into the joints, or wasn’t dressed tight to the brickwork, or wasn’t properly lapped over the roof covering. Atlantic gales will find any weakness in chimney flashing and exploit it. The fix is new lead, properly cut, properly stepped into fresh mortar joints, and properly dressed.
How much does chimney repointing cost in Ireland?
For a typical bungalow chimney, repointing all four sides of the stack above the roofline costs between €400 and €700 including scaffolding, materials, and labour. For a two-storey house, expect €600 to €1,000. If only one or two faces need work – for example, the weather side that faces the prevailing wind – the cost is lower. These are real ranges based on the chimney repairs we carry out across Mayo, Sligo, Leitrim, and Roscommon. Every chimney is different, every property is different, and the only way to get a firm price for your chimney is to have it inspected. That inspection is free and comes with no obligation.
Can a cracked chimney pot cause damp inside the house?
Yes – and it often does. A cracked chimney pot lets rainwater run straight down the flue. That water soaks into the chimney breast brickwork from the inside, travels down through the wall, and appears as damp patches on the chimney breast in the rooms below. The pot might be cracked at the top where you can see it from the ground, or it might be cracked further down inside the flaunching where it’s not visible. If you have damp on the chimney breast and the flashing and pointing look sound, the pot is the next thing to check. Replacing a cracked pot is a straightforward job that stops the water at the source.
What does a chimney cowl do and do I need one?
A chimney cowl is a ventilated cap that fits over the chimney pot. If your chimney is in use with an open fire or stove, a cowl prevents rain from driving down the flue, stops birds from nesting, and improves the draw in windy conditions – so less smoke comes back into the room. If your chimney is disused, a ventilated cowl is essential. It keeps rain and birds out while allowing the flue to breathe. Without a cowl on a disused chimney, the flue traps moisture and the chimney breast stays damp. Every chimney should have a cowl – it’s a small cost that prevents multiple problems. We fit cowls as part of a chimney repair job or as a standalone service.
How long does chimney repair work take?
A straightforward chimney repoint on all four sides of a bungalow stack typically takes one day on site, plus scaffold erection and dismantling which add a day either side. A full chimney overhaul – repointing, flashing replacement, pot replacement, and cowl fitting – on a bungalow typically takes two to three days on site. For a two-storey house, add a day to each. The mortar needs time to cure before the scaffold comes down – usually 24 hours is enough for the initial set, but full curing takes several days. In wet weather, we protect the fresh mortar with sheeting so the work can proceed. We’ll give you a clear timeline with your quote, and we stick to it.
Do I need scaffolding for chimney repairs?
Yes. Every chimney repair we carry out is done from proper access scaffolding or a mobile tower. We don’t work off ladders for chimney repairs. Repointing, flashing replacement, pot work, and render repair all require you to work methodically around the stack with both hands free and a stable platform under your feet. Ladder work on chimneys is dangerous for the tradesman and produces a poor-quality repair because you can’t get the right working position. Scaffolding is included in every chimney repair quote we provide. If scaffolding is already on site for other work – roof repairs, for example – we coordinate so you don’t pay for it twice.
How often should my chimney be inspected?
We recommend having your chimney visually inspected every two to three years, or after any major storm. You can keep an eye on the basics from the ground – look for missing mortar, visible cracks, leaning, or plants growing from the joints. If you have binoculars, use them. But a ground-level check can’t see what’s happening on the back of the stack, the condition of the flashing against the roof, or the state of the flaunching around the pot. A proper up-close inspection every few years catches problems when they’re small and cheap to fix, rather than waiting until the chimney is visibly failing and the repair bill has tripled. Our inspection service is free – the only cost is the scaffolding if the chimney needs work.