Greater London · England
South Tottenham External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for South Tottenham, backed by a 12-month guarantee. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Failed seals between different materials
- Weathered mastic that no longer stretches
External mastic for homes and businesses in South Tottenham
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 in a matching colour. If you have plants rooting in failed movement joints and water getting into walls through failed joints, we can help.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In South Tottenham, joints up high may need ladders or other access, which is worth talking through when you book.
You get a one-year guarantee, the same in South Tottenham as everywhere else we work.
- Location
- South Tottenham (N15, N17, N16)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
After the cure time, these simple habits help:
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
- Keep high-pressure jets off the joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Places near South Tottenham
What else we do in South Tottenham
Leave it or put it right?
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 damage spreads beyond the joint. 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.
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
Why book with us
- ARBOMaster approved applicator
- Neat joints and a tidy finish
- 4.9 on Google from 180+ five-star reviews
- A 12-month guarantee on all work
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How it works
When we arrive, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a London area like South Tottenham, 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.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
Getting a quote
For external mastic in South Tottenham, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
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When to call us in South Tottenham
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
If you can see any of these, it’s time to have the joints looked at:
- Brick movement joints where the sealant has split
- Failed seals between different materials
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
In the older streets around Church of Holy Trinity, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- Whether the sealant suits the joint
- Whether they seal over old material or remove it
- What the quote includes, VAT included or not
- What happens if the job turns out different
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Structural movement, which needs a surveyor or engineer
- Damp that is not coming from the joint
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Façade panels
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
Walls and rooflines in South Tottenham
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Seven Sisters station, split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Earlsmead Primary School, its movement joints, gutters and trims need looking after like any other building’s.
South Tottenham is about 2 miles west of Walthamstow, in Greater London. Wherever you are in the N15 postcode area, we cover external mastic for homes and businesses. 764 places in Greater London are on our list. There’s also a page for London, about 6 miles away.
Postcode districts we cover here for external mastic: N15, N17 and N16. Local streets include Ida Road, Elmar Road and Grove Road, all of which we cover. If you are just outside South Tottenham, we cover Seven Sisters (1 mile south), Tottenham Green (1 mile north), St Ann's (1 mile west), Tottenham Hale (1 mile north-east) and West Green (1 mile west). Within a short drive, we also cover London (6 miles south), City of Westminster (6 miles south-west), Marylebone (6 miles south-west), Kensington (8 miles south-west), St Pancras (4 miles south-west) and Shoreditch (4 miles south).
Near you in South Tottenham
Locally, jobs take us to homes and businesses close to Church of St Andrew, Ada College and Gladesmore Community School, among other places. Nearby too are Chestnuts Park (0.7 miles west) and No.8 Seven Sisters pub (0.5 miles south-west). There’s a railway station in South Tottenham itself: Seven Sisters station. Well-known places in the area include The Mall Wood Green (1.7 miles north-west) and North Middlesex University Hospital (2 miles north). Green spaces nearby include Highgate Hill and Woodberry Wetlands.
Different surfaces, different methods
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
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.
Questions from South Tottenham
Do you work for landlords with property near Seven Sisters station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is South Tottenham in your area for external mastic?
Yes, South Tottenham is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
How long will you be here?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we’ll tell you how long to expect.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we are done.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Is there a guarantee?
Yes: twelve months. If anything is not right with the work within the year, let us know and we will sort it.
How long does external mastic last?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.