Greater London · England
External & façade joints in Leamouth, Greater London
External mastic in Leamouth from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints where the bead has come unstuck
- Rigid filler in a joint that should flex
- Moss and dirt in joints with no sealant left
How we handle external mastic in Leamouth
On houses, flats and commercial buildings across Leamouth, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on façade panels, render & cladding joints and concrete & block, and people most often call us about panel joints letting water in and rigid filler in a joint that should flex.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in Leamouth, check the lease for who looks after the outside.
We stand behind the work with a one-year guarantee, so you are covered after we’ve gone.
- Where
- Leamouth (E16, E14, SE10)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leamouth questions
Is parking a problem for a job in Leamouth?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you work for landlords with property near Custom House station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Why do you put foam in the joint first?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Why deal with it now?
Water gets in through a failed movement joint. Dealing with it early keeps the repair to the joint, rather than the wall around it. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
What you get with us
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
- Old sealant always removed completely
- We leave the area clean and tidy
Read our cost guide or our reviews.
Nearby places to Leamouth
Other services in Leamouth
Landlords, agents and businesses in Leamouth
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Make sure movement joints are not pointed over
- Tell anyone working on the walls about the movement joints
- Act on the first splits you see
- Wash walls gently around the sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Act while the splits are small. Then it’s a straightforward cut-out and reseal before water has had years to get in.
Do you need external mastic in Leamouth?
If plants are growing out of a joint, the sealant has normally failed or was never there. Roots and dirt hold water against the wall and make things worse.
Keep an eye out for these signs:
- Cracked joints where brick meets render or frames
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
For an older house near a landmark such as Church of St Luke, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- What happens if they find a problem under the old sealant
- What preparation is included
- Is the old sealant removed completely?
- Who turns up on the day
How it works
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a job in Leamouth, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Mention any parking rules near the property
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Get a quote
We don’t publish a price list, because every job is different. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.
Related advice
DIY sealant or a professional job?
If you’re 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.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Outside joints around Leamouth
Historic houses like Queen's House (about 2.1 miles south) are a reminder that the area around Leamouth has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Custom House station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. For site and facilities teams at buildings such as St Luke's Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Leamouth is about 1 mile west of Canning Town, in Greater London. Leamouth gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Leamouth is one of 764 towns and villages in Greater London we cover.
Jobs for external mastic in E16, E14 and SE10 is quoted and booked the same way as anywhere else. You’ll find streets such as Ives Road, Nutmeg Lane and Abbott Road, and we cover them all. Leamouth is on the A1262 and A1263, so it’s easy for us to get to with everything needed for external mastic. Close by, we work in Limmo Peninsula (1 mile east), Blackwall (1 mile south-west), Coldharbour (1 mile south-west), Canning Town (1 mile east) and West Silvertown (1 mile south-east). We also work in nearby towns such as London (4 miles west), City of Westminster (7 miles west), Marylebone (7 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (4 miles west).
What’s near Leamouth
Around Leamouth, our work takes us to homes and buildings near Rokeby School, Tower Hamlets College and Bridge House. For rail, the closest station is Custom House station, roughly 0.9 miles east of the centre. A little further out are Stratford Centre (2.2 miles north) and London Gas Museum (0.9 miles north-west). Green spaces nearby include Lavender Pond and Hollow Pond.
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.