Greater London · England
North Greenwich External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in North Greenwich. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked joints where brick meets render or frames
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
How we handle external mastic in North Greenwich
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. We work on façade panels, brickwork movement joints and render & cladding joints, and the jobs we see most are gaps where render, brick and frames meet and water getting into walls through failed joints.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. In a converted house in North Greenwich, it’s worth checking who is responsible for the outside before booking.
A one-year guarantee comes as standard.
- Where
- North Greenwich (E14, SE8, SE10)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What affects the quote in North Greenwich
You will get a clear quote before work begins. It’s based on:
- Any working-time requirements on site
- Mould in or behind the old joints
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- Whether it’s a home or a business
- Roughly how big the job is
- Pictures of the joints, sent by email
- If someone has resealed it before
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in North Greenwich.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why North Greenwich customers choose us
- Approved under the ARBOMaster scheme
- Homes, businesses and hotels
- 12-month guarantee on every job
- Neat joints and a tidy finish
Take a look at our cost guide or what customers say.
Places near North Greenwich
More services for North Greenwich
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Honest limits
We will not take on work that won’t last, so these are the limits:
- Subsidence or other structural problems
- Damp that is not coming from the joint
- Render that’s blown, hollow or coming away
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
How it works
At the end, we look at the finished work together. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in North Greenwich. It helps if you can point us to a visitor permit or a bay close to the door.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Asking for a quote is easy: tell us what needs doing and where. A few pictures by email make the job easier to understand.
Read more
Landlord and commercial work in North Greenwich
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Landlords and agents in North Greenwich can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
FAQs for North Greenwich
Do you cover North Greenwich for external mastic?
Yes. We work across London and the South East, and North Greenwich is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Is parking an issue for external mastic in North Greenwich?
Parking in North Greenwich, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for landlords and businesses?
Yes, often. Several properties can go on one quote.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or drop us an email.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How long does external mastic take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We’ll tell you when we quote.
External mastic in North Greenwich: local notes
Historic houses like Queen's House (about 0.8 miles south-east) are a reminder that the area around North Greenwich has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
For site and facilities teams at buildings such as Harbinger Primary School, larger buildings have long runs of movement joint that eventually need resealing. Homes close to Church of St Nicholas include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near Greenwich station, split movement joints are easy to miss on a rental until damp shows inside.
North Greenwich is about 1 mile north-west of Greenwich, in Greater London. Across the E14 area, we cover external mastic for homes and businesses. Our Greater London coverage runs to 764 places, North Greenwich among them.
Work in E14, SE8 and SE10 is quoted and booked the same way as anywhere else. That includes homes and businesses on Creek Road, Wynan Road and Undine Road and the roads around them. If you are just outside North Greenwich, we cover Isle of Dogs (1 mile south-east), Millwall (1 mile west), Cubitt Town (1 mile north-east), Deptford (1 mile south-west) and Greenwich (1 mile south-east). Further out, we also cover London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
What’s near North Greenwich
Typical jobs here are in homes near Laban Centre, Canary Wharf College 3 and St. Paul's. Also close by are Mudchute Park and Farm (within half a mile north-east) and The Ferry House Public House (under half a mile south-east). North Greenwich’s nearest station is Greenwich station, about 0.8 miles south of the centre. Well-known places in the area include Old Royal Naval College (0.7 miles south-east) and Greenwich Castle (1.1 miles south-east). Not far away are Sue Godfrey Nature Park and Tower Hill.