Greater London · England
Plumstead External Mastic
We cover Plumstead for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Tell anyone working on the walls about the movement joints
- Avoid pressure-washing directly into sealant joints
- Keep movement joints as flexible joints, not mortar
- Clear growth from the base of walls and joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
External mastic for homes and businesses in Plumstead
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. We are often asked to deal with rigid filler in a joint that should flex and sealant pulling away from one side of the joint, on brickwork movement joints, concrete & block and façade panels.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Plumstead, check the lease for who looks after the outside.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Plumstead (SE18, SE28, E16)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Plumstead
What else we do in Plumstead
What we do, step by step
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to several days, depending on the building. In a London area like Plumstead, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Move anything stored near the joints
- Tell us if parking is tricky
- Mention any tricky access
Getting a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or drop us an email.
Advice
External mastic in Plumstead: local notes
Historic houses like Danson House (about 2.7 miles south-east) are a reminder that the area around Plumstead has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
If you live in an older home near St John's Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. Plumstead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Plumstead is about 8 miles east of London, in Greater London. Whether you are in the middle of Plumstead or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Plumstead is one of 764 places in Greater London where we work for external mastic. We also work in London, around 8 miles away.
Every address in SE18, SE28 and E16 is within our area for external mastic, from the main roads to the quietest streets. Local streets include Moy Lane, Love Lane and Tuam Road. You’ll find Plumstead on the A206, which makes it straightforward to reach with everything needed for external mastic. Neighbouring places we cover for external mastic include Woolwich (1 mile west), Shooter's Hill (1 mile south-west), East Wickham (1 mile south-east), Charlton (2 miles west) and New Charlton (2 miles west). We also work in nearby towns such as London (8 miles west), City of Westminster (10 miles west), Marylebone (10 miles west), Kensington (12 miles west), St Pancras (9 miles west) and Shoreditch (7 miles west).
Landmarks near Plumstead
Typical jobs here are in homes near Shooters Hill Sixth Form College, Plumstead Manor School and Plumstead Common and the streets around them. There’s a railway station in Plumstead itself: Plumstead station. Well-known places in the area include British Hospital for Mothers and Babies (1.3 miles west) and Greenwich Castle (3.6 miles west). For a walk, there’s Gilbert's Pit.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Signs you need external mastic in Plumstead
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
It’s worth asking for a quote if you see:
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
For landlords with property near Plumstead station, outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before you book
- What product goes in the joint
- How the surfaces are prepared before sealing
- Who turns up on the day
- Whether they’re fully insured
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any working-time requirements on site
- The product the joint needs
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email and we will talk you through it.
What to tell us for a quote
To make quoting easier, let us know:
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Plumstead: your questions answered
Can you do external mastic in Plumstead?
Yes, Plumstead is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Is parking an issue for external mastic in Plumstead?
Parking in Plumstead, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Is there any odour?
Possibly a little. It fades as the sealant cures.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We’ll talk through colour options before we start from the range available.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we are using.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides, primed where needed.
What we can’t put right
A few problems are outside what sealant work can do:
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
- Failed render or damaged cladding panels
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before you book.
Where we work in Plumstead
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints
- Joints between brick and frames