Greater London · England
External & façade joints in Coney Hall, Greater London
Our applicators work in Coney Hall on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
External mastic in Coney Hall, done properly
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. If you’re dealing with joints with sealant missing in places and rain getting behind render or cladding at a joint, we can put it right, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Coney Hall, check the lease for who looks after the outside.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Coney Hall (BR4, CR0, BR3)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Coney Hall
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
When it is not the sealant
It helps to know what we can’t do too:
- Failed render or damaged cladding panels
- Adding movement joints to masonry that has none
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Brickwork movement joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
FAQs for Coney Hall
Do you work for landlords with property near West Wickham station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can you do external mastic in Coney Hall?
Yes. Our work covers London and the South East, and Coney Hall is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
How much does external mastic cost in Coney Hall?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Quotes for external mastic in Coney Hall
We do not publish a price list, because jobs vary so much. What we look at:
- When we can work, for business premises
- The size of the job
- How many rooms, windows or areas are involved
- Which sealant suits the joint
We don’t 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 send us an email and we will talk you through it.
Helping us quote
What to tell us when you ask for a quote:
- Where the property is
- Pictures of the joints, sent by email
- Whether it has been sealed before
- The problem you’ve noticed
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Why deal with it now?
Sealing over the top of old mastic does not hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Coney Hall, the repair is bigger than the sealant job would have been.
Doing several joints on one visit usually makes better use of the time than several visits. We will give you a clear price for the lot.
Why choose Mr Mastic in Coney Hall
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
- More than 20 years in sealant work
- Old sealant always removed completely
Read what affects the cost and our reviews.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Deal with leaking gutters that soak the joints below
- Do not let climbing plants root in the sealant
- Make sure movement joints aren’t pointed over
- Ask before painting over external sealant
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted, and paint can crack as the joint moves.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Outside joints around Coney Hall
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Addington Palace (about 1.2 miles south-west) are a reminder that the area around Coney Hall 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.
For an older house near a landmark such as St Francis of Assisi, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Forest Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. Coney Hall is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Coney Hall is about 3 miles south of Beckenham, in Greater London. Whether you are in the middle of Coney Hall or further out, we cover external mastic for every kind of property. Our Greater London coverage runs to 764 places, and Coney Hall is one of them. You can also see our page for London, roughly 9 miles from Coney Hall.
Work in BR4, CR0 and BR3 works the same way as everywhere else we cover. That includes homes and businesses on Ash Road, Kent Road and Briar Lane and the roads around them. Close by, we work in West Wickham (1 mile north), Spring Park (1 mile north-west), Addington (1 mile south), Eden Park (1 mile north) and Hayes (1 mile east). We also work in nearby towns such as London (9 miles north), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (12 miles north-west), St Pancras (11 miles north) and Shoreditch (11 miles north).
What’s near Coney Hall
Typical jobs here are in homes near All Saints Catholic School, Millers Pond and The Wheatsheaf pub, among other places. For rail, the closest station is West Wickham station, roughly 0.8 miles north-east of the centre. Other landmarks nearby include The Mall (2.7 miles north-east) and National Psychosis Unit (0.8 miles north-west). For a walk, there’s Duppas Hill and Bramley Bank.
Nearby places to Coney Hall
Other services in Coney Hall
The process
You do not need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building for a typical job. In a London area like Coney Hall, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re 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.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
Get a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before work begins.