Greater London · England
External & façade joints in Hounslow, Greater London
External mastic for Hounslow, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
What the job involves on each surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
External mastic for homes and businesses in Hounslow
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. If you have gaps where render, brick and frames meet and weeds or debris growing in open joints, we can put it right.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Hounslow, check the lease for who looks after the outside.
Every job comes with our 12-month guarantee, wherever you are in Greater London.
- Where
- Hounslow (TW3, TW7, TW2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Hounslow: your questions answered
I let a flat near Hounslow station. Can you help?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Is parking an issue for external mastic in Hounslow?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Also near Hounslow
Other services in Hounslow
What external mastic looks like in Hounslow
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Chatsworth Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Mary the Virgin include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Hounslow is about 9 miles west of City of Westminster, in Greater London. We provide external mastic to householders, landlords and businesses in Hounslow and the surrounding area. Hounslow is one of 764 places in Greater London where we work. There’s also a page for London, roughly 11 miles from Hounslow.
Our applicators cover all of TW3, TW7 and TW2 for external mastic and the streets around it. We cover properties on New Road, Ivy Road and Bell Road and the roads around them. We also cover Woodlands (1 mile north-east), Ivybridge (1 mile south-east), Lampton (1 mile north-west), Isleworth (1 mile east) and Spring Grove (1 mile north). Larger places within reach include London (11 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (7 miles east), St Pancras (11 miles east) and Shoreditch (12 miles east).
Around Hounslow
Typical jobs here are in homes near Moon Under Water pub, Kingsley Academy and Inwood Park, among other places. The nearest railway station is Hounslow station, roughly 0.6 miles south-west. Well-known places in the area include Museum of Army Music (0.8 miles south) and South Middlesex Hospital (0.9 miles south-east). For a walk, there’s Garden Lake and Richmond Hill.
The process
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- 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.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
How to get a quote
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Read more
For landlords and businesses
For anyone letting property in or around Hounslow, several properties can go on one quote. Send us the addresses and the work at each.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Honest limits
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Loose or hollow render, which needs re-rendering
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that is more than a sealant joint can take
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Surfaces we seal
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
When to call us in Hounslow
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Keep an eye out for these signs:
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
For landlords with property near Hounslow station, split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
- Is the old sealant removed completely?
- What the quote includes, VAT included or not
Quotes for external mastic in Hounslow
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Access and height
- Any mould that needs treating
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
To help us quote quickly, please include:
- Where the property is
- How we’d reach the joints
- Any previous sealing or DIY work
- The type of property
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.