Greater London · England
Dulwich Village External Mastic
Specialist external mastic for Dulwich Village: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
How we handle external mastic in Dulwich Village
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. We’re often asked to deal with joints pointed up with cement by mistake and plants rooting in failed movement joints, across concrete & block, joints between brick and frames and brickwork movement joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Dulwich Village (SE22, SE21, SE24)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Check external joints each spring
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
- Do not let climbing plants root in the sealant
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Places near Dulwich Village
Also in Dulwich Village
The process
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours to a few days, depending on the length of joint and the access. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Dulwich Village. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we are working on
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Related advice
External mastic in Dulwich Village: local notes
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St Barnabas' Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near North Dulwich station, outside joints that have cracked can let damp into a rental, so check them between lets.
Dulwich Village is about 1 mile south-east of Herne Hill, in Greater London. Jobs in Dulwich Village get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Dulwich Village is one of 764 places in Greater London we cover for external mastic.
Here we cover the SE22, SE21 and SE24 postcode area for external mastic. We cover properties on Court Lane, Druce Road and Turney Road. With the A2216 close by, Dulwich Village is simple for us to get to. If you are just outside Dulwich Village, we cover Dulwich (1 mile south-east), Herne Hill (1 mile north-west), East Dulwich (1 mile north), West Dulwich (1 mile south) and Denmark Hill (1 mile north). Within a short drive, we also cover London (3 miles north), City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles north-west), St Pancras (5 miles north) and Shoreditch (5 miles north).
Near you in Dulwich Village
Around Dulwich Village, our work takes us to homes and buildings near Alleyn's School, The Crown and Greyhound pub and The Charter School. There’s a railway station in Dulwich Village itself: North Dulwich station. Well-known places in the area include Lewisham Shopping Centre (3.2 miles east) and Greenwich Castle (4 miles north-east). Open spaces near Dulwich Village include Knight's Hill and Centre for Wildlife Gardening.
What the job involves on each surface
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- The old material and how stubborn it is
- When we can work, for business premises
- How many areas need sealing
- Whether there’s mould to deal with
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before we start.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- Whether it has been sealed before
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
- A few photos by email, if you can
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
FAQs for Dulwich Village
Do you work for landlords with property near North Dulwich station?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Is parking a problem for a job in Dulwich Village?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
How do I get a quote for external mastic in Dulwich Village?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
What we’re called out for in Dulwich Village
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
Any of these means the joints need attention:
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
For site and facilities teams at buildings such as Dulwich Hamlet Junior School, its movement joints, gutters and trims need looking after like any other building’s.
Before you book anyone
- The length of the guarantee
- Who turns up on the day
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
When something else is needed
In fairness, some problems need a different trade:
- Render that’s blown, hollow or coming away
- Adding movement joints to masonry that has none
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Where we work in Dulwich Village
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block