Greater London · England
Kensington Remedial Sealant
Removing failed, mouldy or leaking sealant and putting it right for Kensington, backed by a 12-month guarantee. Ask us for a quote.
- Sealant peeling off a dusty or damp surface
- Wide, uneven beads that look worse than the old ones
- Over-sealed joints coming away
Different surfaces, different methods
Leaking trays & enclosures
Repeat shower leaks often come from a tray that flexes or an enclosure sealed in the wrong place. Both are checked before any new sealant goes on.
Movement & expansion joints
Movement joints in floors, walls and façades need a flexible sealant set to the right depth. We remove the failed sealant, fit backing and reseal with a low-modulus product.
Remedial sealant for homes and businesses in Kensington
Decorators’ caulk in a shower, bathroom silicone on a window, a rigid filler in a movement joint fails however neatly it’s applied. We take it out and use a sealant made for that joint. If you are dealing with sealant applied over old sealant that has lifted and repeat leaks from the same joint, we can put it right, whatever the surface.
London’s water is hard, so limescale builds up along sealant lines, in grout and on fittings. In Kensington, remedial sealant is as much about a room looking cared for as about keeping water out.
You get a one-year guarantee, the same in Kensington as everywhere else we work.
- Where
- Kensington (W11, W8, W14, SW7)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Repeat failures have a cause. Finding it, whether movement, water from elsewhere or an unsuitable product, ends the cycle. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Kensington, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Kensington
- Over 20 years’ experience
- Full insurance on every job
- A choice of colours where the product allows
- An ARBOMaster approved applicator
Take a look at what affects the cost or what customers say.
How the visit works
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for most joints, depending on how much old sealant has to come out. In Kensington, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First we work out whether the problem is the sealant, movement or a leak.
- Old beads and residue are removed down to clean surfaces.
- Mould is treated and the joint dried.
- The right product goes in, with backing where the joint moves.
- The joint is tooled and you are told about anything else we found.
Before we arrive
- Mention any tricky access
- Mention if the joints have been sealed before
- Clear the area around the work
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Advice
What affects the cost of remedial sealant
We do not publish a price list, because jobs vary so much. What we look at:
- Access and height
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- How many rooms, windows or areas are involved
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- A few pictures by email, if you can
- The rough size of the job
- How we’d reach the joints
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you’re ready, call 0345 464 0079 or drop us an email.
When to call us in Kensington
Using the wrong product is a common cause: acrylic caulk in a wet area, a general-purpose sealant on a moving joint, or an acetoxy silicone on natural stone or some metals. Each fails in its own way.
Signs it’s time to call us include:
- Sealant peeling off a dusty or damp surface
- Wide, uneven beads that look worse than the old ones
- Caulk or the wrong sealant used in a wet area
- A shower that leaks however often it’s resealed
Rented homes near Kensington Olympia station change hands often, and botched sealant from a previous quick fix is easier to strip out between tenants.
Questions to ask before booking
- How much experience the applicator has
- How long to leave it before use
- Are they insured?
- What the quote includes, VAT included or not
Kensington homes and their sealant
Kensington has hotels and guest accommodation nearby. As well as homes, we work in hotel bathrooms, where resealing and regrouting can be done room by room. In a London flat, water from a failed bath or shower seal can reach the neighbours below, so tired sealant is best dealt with early.
Homes close to Church of St Barnabas include some older properties, and bathrooms in older houses have often been refitted more than once, with sealant laid over sealant. As a London address, Kensington can be tricky for parking: let us know about parking bays, permits or a driveway.
Kensington is about 5 miles west of London, in Greater London. Whether you are in the middle of Kensington or further out, we cover remedial sealant for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Kensington is one of them.
Every address in W11, W8, W14 and SW7 is covered for remedial sealant. You’ll find streets such as Kensington High Street, Edwardes Square and Somerset Square, and we cover them all. With the A402 and B316 close by, Kensington is simple for us to get to for remedial sealant. Other places close to Kensington include Holland Park (1 mile north), Notting Hill (1 mile north), Shepherd's Bush (1 mile west), Notting Dale (1 mile north) and White City (1 mile north-west). Within a short drive, we also cover London (5 miles east), Marylebone (3 miles north-east), St Pancras (4 miles north-east), Shoreditch (6 miles east), Walthamstow (10 miles north-east) and Hoxton (6 miles north-east). As one of the bigger places in Greater London, Kensington has homes, rented property and businesses of every kind.
Local landmarks in Kensington
We work in homes and buildings around Holland Park, Scarsdale Tavern and Holland Park School and the streets around them. Nearby too are Kensington School (0.5 miles east) and Abdus Salam Library (1 mile east). There’s a railway station in Kensington itself: Kensington Olympia station. Well-known places in the area include Kensington Arcade (within half a mile east) and London Museum (0.7 miles north-east). Not far away are WWT London Wetland Centre and The Long Water.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
FAQs for Kensington
Do you work in hotels near Kensington?
Yes, we work for hotels as well as homes and businesses. A room-by-room programme keeps most rooms in use while the work goes on.
I let a flat near Kensington Olympia station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Do you offer different sealant colours?
In most cases you can choose. We’ll tell you which colours the right product comes in.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can old silicone be taken off without scratching the tiles?
Yes. The old bead is cut and lifted with tools that suit the surface, and the residue is cleaned away. We point out any damage that is already there.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
What if resealing won’t fix my leak?
That is why we look for the cause first. If the fault is elsewhere, you’ll know before any work is done.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.