Greater London · England
External Mastic in South Kensington
Sealing brickwork movement joints, render, cladding and façade joints for South Kensington, backed by a 12-month guarantee. Call for a quick quote.
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
External mastic for homes and businesses in South Kensington
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it. If you are dealing with old sealant gone brittle and cracked and cracked joints where brick meets render or frames, we can help.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
Your job is guaranteed for a year, as with all our work.
- Location
- South Kensington (SW3, SW7, SW10)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Check the sealant is paintable before painting near it
- Check external joints each spring
- Keep movement joints as flexible joints, not mortar
- Have failed joints looked at early
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
How the visit works
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. Most jobs take anything from a few hours to several days, depending on the building. For a job in South Kensington, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
Getting a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
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What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
Do you need external mastic in South Kensington?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Keep an eye out for these signs:
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
If you look after a building such as Our Lady of Victories RC Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- What the cure time is
- How the joint is cleaned and prepared
- Is VAT in the price?
- Whether all the old sealant comes out first
What external mastic looks like in South Kensington
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. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
If you live in an older home near Chapel of St Luke, the joints between older walls, newer extensions and the roofline need a sealant that can move. South Kensington is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
South Kensington is about 1 mile south-east of Kensington, in Greater London. Every kind of property in South Kensington is covered for external mastic. The work is guaranteed for a year. 764 places in Greater London are on our list, from the larger towns to small villages.
Our applicators cover all of SW3, SW7 and SW10 for external mastic. Whether your property is on King's Road, Fulham Road and Museum Lane or a nearby road, our applicators can take on the job. Main roads around South Kensington include the A3217, so getting to you is simple. Close by, we work in Little Chelsea (1 mile south), Chelsea (1 mile east), Brompton (1 mile north-east), World's End (1 mile south) and Earl's Court (1 mile west). Further out, we also cover London (4 miles east), St Pancras (4 miles north-east), Shoreditch (5 miles north-east), Walthamstow (9 miles north-east), Hoxton (5 miles north-east) and Whitechapel (5 miles east).
Near you in South Kensington
Locally, jobs take us to homes and businesses close to London School of Dramatic Art, Burton’s Court and Anglesea Arms. Other local landmarks include Natural History Museum Library and Archives (within half a mile north) and Collingham College (0.5 miles west). The nearest railway station is West Brompton station, about 0.8 miles west of the centre. Nearby you will also find Victoria and Albert Museum Spiral (within half a mile north) and Baynard's Castle (3.6 miles north-east). For a walk, there’s Serpentine and Campden Hill.
What affects the cost of external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- Whether old sealant or filler has to be cut out
- The size of the job
- When we can work, for business premises
- How easy the joints are to reach
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Asking for a quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- If someone has resealed it before
- Photos by email, if that’s easy
- Roughly how big the job is
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
For landlords and businesses
We also work for property managers and facilities teams in South Kensington and across Greater London. Several sites can be quoted together, and we’re fully insured for the work.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Towns and villages near South Kensington
Other services in South Kensington
Your questions about external mastic in South Kensington
Do you work for landlords with property near West Brompton station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Can parking be tricky for a visit in South Kensington?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you when we finish.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
How do I get a quote for external mastic in South Kensington?
Size, access and the old material all affect the cost. Ask us for a quote.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we’ll sort it.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
How the job changes by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.