Greater London · England
External & façade joints in Copse Hill, Greater London
Professional external mastic in and around Copse Hill, with old sealant always removed completely.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
External mastic in Copse Hill
On houses, flats and commercial buildings across Copse Hill, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We work on copings & trims, joints between brick and frames and render & cladding joints, and people most often call us about joints with sealant missing in places and moss and dirt in joints with no sealant left.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Copse Hill, tell us how high the joints are and how to reach the back of the building.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Where
- Copse Hill (SW20, SW19)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. In a London area like Copse Hill, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
Ask for a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Advice
What the job involves on each surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so its sealant has to stay flexible.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Leave the joints unpainted unless we’ve said otherwise
- Keep movement joints as flexible joints, not mortar
- Keep soil, plants and ivy away from the joints
- Get split or bare joints resealed while the damage is small
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Nearby places to Copse Hill
More services for Copse Hill
Common questions in Copse Hill
Do you work for landlords with property near Raynes Park station?
Yes. We work for letting agents and landlords as well as homeowners. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Can parking be tricky for a visit in Copse Hill?
Parking in Copse Hill, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Where do you work from?
We work from Crawley. We cover Copse Hill and the rest of Greater London.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Do you guarantee your work?
Yes. Every job comes with a 12-month guarantee.
How do I get a quote for external mastic in Copse Hill?
Size, access and the old material all affect the cost. Ask us for a quote.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What affects the quote in Copse Hill
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How easy the joints are to reach
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or email us for an honest opinion and a quote.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- Where the property is
- Roughly how big the job is
For external mastic in Copse Hill, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
Walls and rooflines in Copse Hill
Historic houses like Southside House (about 0.2 miles south) are a reminder that the area around Copse Hill 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.
If you let a flat or house near Raynes Park station, outside joints that have cracked can let damp into a rental, so check them between lets. As a London address, Copse Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. In the older streets around Christ Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Copse Hill is about 1 mile south-west of Wimbledon, in Greater London. From the centre of Copse Hill to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Copse Hill is one of 764 places in Greater London we cover for external mastic. We also work in London, about 8 miles from Copse Hill.
Jobs for external mastic in SW20 and SW19 is quoted and booked the same way as anywhere else. That includes homes and businesses on Camp Road, Almer Road and Mckay Road. We also cover Crooked Billet (1 mile north-east), Bushey Mead (1 mile south-east), Motspur Park (1 mile south-west), Wimbledon (1 mile north-east) and Raynes Park (1 mile south). Within a short drive, we also cover London (8 miles north-east), City of Westminster (7 miles north-east), Marylebone (8 miles north-east), Kensington (6 miles north), St Pancras (9 miles north-east) and Shoreditch (10 miles north-east).
What’s near Copse Hill
In Copse Hill, that means homes and buildings near The Norwegian School in London, Crooked Billet pub and Ursuline Preparatory School and the streets around them. Copse Hill’s nearest station is Raynes Park station, about 0.6 miles south of the centre. Other landmarks nearby include Wimbledon Museum (0.8 miles north-east) and Atkinson Morley Hospital (less than half a mile west). Not far away are Kew Gardens Lake and Henman Hill.
Landlords, agents and businesses in Copse Hill
Housing providers, facilities teams and property managers book us too in Copse Hill and across Greater London. We can quote a run of properties together, and we’re fully insured.
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render, so the problem grows beyond the joint itself. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in Copse Hill.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- Sanitary silicone with an anti-fungal additive in wet areas
- We agree the colour with you first
- We never seal over old sealant
See our cost guide or customer reviews.