Greater London · England
Peckham External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Peckham. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
Honest limits
Before booking, it’s worth knowing the limits too:
- Structural movement, which needs a surveyor or engineer
- Cracks in the bricks or render themselves, away from the joints
- Cutting new joints into brickwork, which is building work rather than sealant work
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
Surfaces we seal
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Façade panels
About our external mastic in Peckham
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We are often asked to deal with sealant that has lost its bond to the brick or render and gaps where render, brick and frames meet, on render & cladding joints, brickwork movement joints and façade panels.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Peckham, 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 there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Peckham (SE15, SE14, SE5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
You’ll get a clear quote before work begins. It takes into account:
- How many rooms, windows or areas are involved
- Access and height
- Any working-time requirements on site
- Mould in or behind the old joints
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Any previous sealing or DIY work
- Roughly how big the job is
- How we’d reach the joints
- Photos by email, if that is easy
Getting a quote is simple: tell us what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
When to call us in Peckham
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
People generally contact us after spotting one of these:
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
If you look after a building such as John Donne Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- Is the old sealant removed completely?
- How long the guarantee is
- Are they insured?
- When the joint can take water or movement
FAQs for Peckham
Do you cover Peckham for external mastic?
Yes, Peckham is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Do you work for landlords with property near Queens Road Peckham station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
How long before the joint can be used?
Cure times vary by product and the temperature. Before we leave, we will tell you the cure time.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
When will the joints need doing again?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and reseal when it splits.
Should I point up the gap in my brickwork?
No. A mortar-filled joint cannot move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
What we do, step by step
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In a London area like Peckham, 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.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know if you’ve seen damp or leaks
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or send us an email.
Related advice
Can I do it myself?
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.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Peckham buildings and the weather
With historic houses such as Queen's House (about 2.6 miles east) nearby, there’s older building stock in the area around Peckham as well as newer homes. In older buildings, 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.
In the older streets around All Saints Church, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Queens Road Peckham station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Peckham is about 2 miles south-east of London, in Greater London. From the centre of Peckham to the outskirts, we cover external mastic for every kind of property. Across Greater London, we cover 764 places, and Peckham is one of them.
Our applicators cover all of SE15, SE14 and SE5 for external mastic. Whether your property is on Rye Lane, Relf Road and Mona Road or a nearby road, our applicators can take on the job. Peckham is on the A2215, which makes it straightforward to reach with everything needed for external mastic. Other places close to Peckham include Nunhead (1 mile south-east), Telegraph Hill (1 mile south-east), South Bermondsey (1 mile north), Surrey Canal (1 mile north-east) and East Dulwich (1 mile south-west). Within a short drive, we also cover City of Westminster (5 miles north-west), Marylebone (5 miles north-west), Kensington (6 miles west), St Pancras (4 miles north-west), Shoreditch (4 miles north) and Walthamstow (8 miles north).
Landmarks near Peckham
Around Peckham, our work takes us to homes and buildings near Brimmington Park, The St Thomas the Apostle College and The Kentish Drovers pub. Peckham has its own railway station: Queens Road Peckham station. Well-known places in the area include Peckham Platform (less than half a mile north-west) and Southwark Adult Education Institute (under half a mile east). For a walk, there’s St. James's Park Lake and Knight's Hill.
More services for Peckham
Landlord and commercial work in Peckham
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. The sealant is chosen with that in mind.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that’s happened, we rake it out and reseal it properly.