Greater London · England
South Ealing External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in South Ealing and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Rigid filler in a joint that should flex
External mastic for homes and businesses in South Ealing
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. If you have weathered mastic that no longer stretches and failed seals between different materials, we can help, whatever the surface.
Outside work in London starts with access: side passages, upper floors and where to park. In South Ealing, 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 Ealing as everywhere else we work.
- Location
- South Ealing (W5, W13, TW8)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Your questions about external mastic in South Ealing
Is South Ealing in your area for external mastic?
Yes, South Ealing is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Is parking a problem for a job in South Ealing?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us and we are fully insured.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do you work for landlords and businesses?
Yes, often. Several properties can go on one quote, and between tenancies is a good time for the work.
Are you insured?
Yes. We are fully insured, and we have been doing sealant work for more than 20 years.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move.
Walls and rooflines in South Ealing
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near St Mary's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Grange Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
South Ealing is about 1 mile south of Ealing, in Greater London. Across the W5 area, we can carry out external mastic at your property. Our Greater London coverage runs to 764 places, and South Ealing is one of them. Our London page covers work nearby.
Here we cover the W5, W13 and TW8 postcode area for external mastic. You will find streets such as South Road, Elers Road and Carew Road, all of which we cover. We also cover Ealing (1 mile north), Hanwell (1 mile north-west), West Ealing (2 miles west), Pitshanger (2 miles north) and Brentham Garden Suburb (2 miles north). Larger places within reach include London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles east), St Pancras (8 miles east) and Shoreditch (10 miles east).
What’s near South Ealing
Around South Ealing, our work takes us to homes and buildings near Lammas Park, Ealing Independent College and Ealing Park Tavern, among other places. Other local landmarks include Library for Iranian Studies (1.4 miles east) and Great Ealing School (under half a mile north). The closest station to South Ealing is Brentford station, roughly 0.9 miles south of the centre. A little further out are Gunnersbury Park House - Large Mansion (0.9 miles east) and Ealing Hospital (1.7 miles west). Green spaces nearby include Kew Gardens Lake and Castlebar Hill.
Towns and villages near South Ealing
More services for South Ealing
When something else is needed
It helps to know what we cannot do too:
- Movement that’s more than a sealant joint can take
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
What we seal
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
What we are called out for in South Ealing
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
The most common problems we see are:
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
- Failed seals between different materials
- Sealant that has lost its bond to the brick or render
As a London address, South Ealing can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- What guarantee comes with the work
- How hidden problems are handled
- How much experience the applicator has
- What the cure time is
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 older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in South Ealing, the repair is bigger than the sealant job would have been.
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. Ask us for a quote and we’ll go through it with you.
Why choose Mr Mastic in South Ealing
- Any old sealant cut out fully, not covered over
- ARBOMaster approved applicator
- Tidy, careful work
- 20+ years of sealant experience
See our cost guide or what customers say.
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep water from gutters off the wall
- Wash walls gently around the sealant
- Ask before painting over external sealant
- Clear growth from the base of walls and joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation, and the area is left clean. In South Ealing, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Advice
What affects the cost of external mastic
Call for a quick quote. What matters most is:
- Whether the work is at height
- The type of sealant required
- How much there is to do
- How much old sealant there is and how hard it is to remove
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
To help us quote quickly, let us know:
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Any access issues, like height or stairs
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.