Greater London · England
Hounslow West External Mastic
External mastic in Hounslow West from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. 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 Hounslow West, the repair is bigger than the sealant job would have been.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Hounslow West
- We are fully insured
- Homes, businesses and hotels
- An ARBOMaster approved applicator
- Sealant colour chosen to suit
Read our cost guide or customer reviews.
About our external mastic in Hounslow West
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. We work on copings & trims, façade panels and concrete & block, and the jobs we see most are old sealant gone brittle and cracked and rigid filler in a joint that should flex.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Hounslow West, 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 isn’t right with it, ring 0345 464 0079 or email us.
- Location
- Hounslow West (TW4, TW3, TW5)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Other services in Hounslow West
When something else is needed
In fairness, some problems need a different trade:
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Façade panels
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
How the job changes by surface
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible year round.
How the visit works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on the building. In Hounslow West, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we’ll take it from there.
Advice
Do you need external mastic in Hounslow West?
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
It’s worth asking for a quote if you see:
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
For landlords with property near Hounslow station, outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- Whether you can choose the colour
- What product goes in the joint
- Is the old sealant removed completely?
- What insurance they hold
Questions from Hounslow West
Is parking an issue for external mastic in Hounslow West?
Parking in Hounslow West, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for landlords with property near Hounslow station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Do you work in Hounslow West?
Yes. We’re based in Crawley and work across South East England, London and Scotland.
How long does external mastic last?
There’s no fixed answer: 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.
How long does external mastic take?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we will say how long yours will take.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
External mastic in Hounslow West: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
For site and facilities teams at buildings such as Hounslow Heath Infant and Nursery School, its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Church of St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Hounslow West is about 2 miles west of Hounslow, in Greater London. Homes, rented property, offices and hotels in Hounslow West is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 764 places across Greater London, large and small. You can also see our page for London, roughly 13 miles from Hounslow West.
We work across TW4, TW3 and TW5 for external mastic and the streets around it. That includes homes and businesses on Ivy Lane, Toad Lane and Bath Road. You’ll find Hounslow West on the A3006 and A3063, which makes it straightforward to reach with everything needed for external mastic. Neighbouring places we cover for external mastic include Heston (1 mile north), Lampton (1 mile east), North Hyde (2 miles north), Hounslow (2 miles east) and Woodlands (2 miles east). Further out, we also cover London (13 miles east), City of Westminster (11 miles east), Marylebone (11 miles east), Kensington (8 miles east), St Pancras (12 miles east) and Shoreditch (14 miles east).
Local landmarks in Hounslow West
Around Hounslow West, our work takes us to homes and buildings near Hounslow Heath, The Heathland School and Gunnersbury Catholic School, among other places. The nearest railway station is Hounslow station, roughly 1.2 miles east of the centre. Well-known places in the area include Museum of Army Music (1.9 miles south-east) and Hounslow Hospital (0.7 miles east). For a walk, there’s Richmond Hill and Garden Lake.
Looking after it afterwards
To keep the joints looking good and working properly:
- Walk round the building once a year and look at the joints
- Wash walls gently around the sealant
- Ask before painting over external sealant
- Have failed joints looked at early
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.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.