Chimney Repairs North London – Repointing, Flashing & Rebuilds | MJM Roofing

Serving North London — Islington · Camden · Highgate · Hampstead · Barnet
Call us: +44 7728 290555 · Open 7 days for emergencies

Chimney Repairs & Repointing in North London

Crumbling mortar, damaged flashing, or a leaning stack? We diagnose and fix chimney problems before they become serious — protecting your property from water damage and keeping your home safe.

Heritage Chimney Specialists

Lead Flashing Experts

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Why Chimney Problems Shouldn’t Be Ignored

Chimneys are among the most exposed parts of any building. They stand above the roofline, fully exposed to wind, rain, frost, and UV — and in London’s damp climate, the mortar joints and brickwork degrade steadily over time. Left unattended, a deteriorating chimney is one of the most common causes of damp, water ingress, and structural damage in period properties.

The good news is that most chimney problems are straightforward to fix when caught early. From repointing eroded mortar joints to replacing cracked pots and renewing lead flashings, our experienced team handles every aspect of chimney maintenance and repair.

We specialise in the Victorian and Edwardian chimney stacks that are so characteristic of North London’s housing stock. We understand how to work with traditional lime mortar, source matching bricks, and dress lead flashings that will keep water out for decades.

Full and partial chimney repointing using lime or cement mortar
Lead flashing renewal — back gutters, stepped and cover flashings
Chimney pot replacement, cowl and cap fitting
Chimney stack rebuilds — partial and full reconstruction
Chimney removal and capping for disused stacks
Damp investigation and waterproofing treatments

Our Chimney Services

Every Chimney Problem, Solved

From routine repointing to full stack rebuilds, we have the skills and experience to handle any chimney issue.

Chimney Repointing

We rake out degraded mortar and repoint with appropriate lime or cement mortar matched to the age and character of your property. This prevents water penetrating the brickwork and causing internal damp.

Lead Flashing Renewal

Failed flashings are the number one cause of chimney leaks. We strip old or mortar flashings and install new code 4 or code 5 lead, hand-dressed and properly chased into the brickwork for a watertight seal.

Pot & Cowl Fitting

We replace cracked or missing chimney pots with matching originals or modern equivalents. Fitting ventilated cowls on disused flues prevents rain entry while allowing proper airflow to avoid condensation.

Stack Rebuilds

When brickwork has deteriorated beyond repair, we carefully take down and rebuild the chimney stack using matching bricks and traditional methods. All work is structurally sound and visually seamless.

Chimney Removal

If a chimney is no longer needed, we can safely remove the stack above the roofline and cap it properly. This eliminates ongoing maintenance costs while ensuring the roof is properly weatherproofed.

Surveys & Reports

We provide detailed chimney condition reports for homeowners, landlords, and surveyors. Our inspections identify all current and potential problems, with clear recommendations and cost estimates.

How It Works

Our Chimney Repair Process

A straightforward process designed to get your chimney problem diagnosed and fixed quickly and properly.

Inspection

We inspect your chimney from ground level and roof level, identifying all areas of concern. If you’re experiencing damp, we trace the source to determine exactly what needs fixing.

Clear Quote

You receive a written, itemised quote explaining what work is needed, what materials will be used, and the total cost. No hidden extras and no surprises.

Expert Repair

Our experienced team carries out the work efficiently and to the highest standard. We use traditional techniques and quality materials that are appropriate for your property’s age and style.

Quality Check

Every chimney repair is inspected on completion. We photograph the finished work for your records, clean up thoroughly, and provide your workmanship guarantee.

Our Work

Chimney Repair Projects

Examples of chimney repointing, lead flashing, and stack rebuilds across North London.

Chimney repointing on Victorian terrace in Islington

Chimney pot replacement and cowl fitting

Partial chimney stack rebuild with matching bricks

Complete chimney restoration in Highgate

Stepped lead flashing detail on period property

Chimney stack before repair showing crumbling mortar

Completed chimney repointing and new pots

Common Questions

Chimney Repair FAQs

How do I know if my chimney needs repointing?

The most obvious signs are mortar crumbling or falling out from between the bricks, visible gaps in the joints, or damp patches appearing on internal walls near the chimney breast. If your chimney stack is old enough that you can scrape mortar out with your fingernail, it’s time for repointing.

Should I use lime mortar or cement mortar?

For older properties — generally anything built before the 1920s — lime mortar is almost always the correct choice. It’s softer and more flexible than cement, allowing the brickwork to breathe and move naturally. Using hard cement mortar on soft Victorian bricks can actually cause damage by trapping moisture and cracking the bricks themselves. We always advise on the right mortar for your property.

How much does chimney repointing cost?

Chimney repointing on a standard residential stack typically starts from around £400–£600 plus scaffolding costs. Larger stacks, those needing lime mortar, or stacks requiring partial rebuilding will naturally cost more. We always provide a clear, written quote after inspection so there are no surprises.

Can a leaking chimney cause damp in my house?

Absolutely — and it’s one of the most common causes of damp in London’s older homes. Water can enter through failed lead flashings, eroded mortar joints, cracked bricks, or an uncapped flue. This water then tracks down through the chimney breast, appearing as damp patches or staining on internal walls, sometimes far from the original point of entry.

Do I need scaffolding for chimney work?

In most cases, yes. Safe access to a chimney stack requires scaffolding or, for some minor works, a scaffold tower. We include all access costs in our quotes. Proper scaffolding also allows us to do a more thorough job, as we can work safely and inspect the full chimney at close range.

Chimney Problems?

Don’t let a small chimney issue turn into costly water damage. Get in touch today for a free inspection and honest advice.

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