Greater London · England
Remedial sealant & repairs in Clapham, Greater London
Remedial sealant for Clapham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Over-sealed joints coming away
- Gaps opening along the back of the worktop
- Beads that never stuck properly
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Remedial sealant in Clapham, done properly
Remedial work is what we do when sealant has failed or been done badly. Silicone laid over silicone, smears across tiles, the wrong product in a moving joint or mould trapped underneath all have to come out. We’re often asked to deal with sealant peeling off a dusty or damp surface and movement joints that have split or pulled away, across expansion joints, shrunken worktop sealant and botched or over-sealed joints.
Across London, a large share of homes are flats, conversions or mansion blocks, so a bathroom is often directly above a neighbour’s ceiling. In Clapham, that’s a good reason to put tired sealant and grout right early.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Clapham (SW4, SW8, SW9)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we are called out for in Clapham
Joint depth matters. Sealant packed too deep, or stuck to the back of the joint as well as the sides, cannot stretch, and tears at the first real movement. Backing sets the depth and stops that.
Any of these means the joints need attention:
- Sealant applied over old sealant that has lifted
- Beads that never stuck properly
- Black mould underneath the bead
- Floor or wall movement joints that have failed
For an older house near a landmark such as St Paul's Church, older homes can move a little, which is hard on rigid grout and tired sealant.
Questions to ask before booking
- Is VAT in the price?
- Whether the sealant suits the joint
- How long the guarantee is
- How much experience the applicator has
Nearby places to Clapham
Also in Clapham
Quotes for remedial sealant in Clapham
Every job gets its own quote. These are the things that affect it:
- Any mould that needs treating
- The old material and how stubborn it is
- Whether the work is at height
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, 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
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Any previous sealing or DIY work
- The rough size of the job
- Where the property is
- Any access issues, like height or stairs
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.
Remedial sealant around Clapham
London has hard water, so limescale builds up on sealant, grout and fittings. There are hotels and other places to stay in and around Clapham. Hotel bathrooms are part of our work as well as homes, and can be done room by room.
Rented homes near Clapham High Street station change hands often, and failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak. If you look after a building such as Clapham Manor Primary School, washroom and kitchen sealant there needs the same care as at home, and schools and businesses are part of our work as well as homes.
Clapham is about 3 miles north of Streatham, in Greater London. Homes, rented property, offices and hotels in Clapham can book us for remedial sealant. Every job comes with our one-year guarantee. Clapham is one of 764 places in Greater London where we work for remedial sealant.
Postcode districts we cover here for remedial sealant: SW4, SW8 and SW9. That includes homes and businesses on Grafton Square, Clapham High Street and Houghton Square. Clapham sits on or near the B224 and B303, so getting to you is simple. We also cover the places around Clapham: Stockwell (1 mile east), Little Portugal (1 mile north-east), Clapham Park (1 mile south), South Lambeth (1 mile north-east) and Brixton (1 mile south-east). We also work in nearby towns such as London (3 miles north-east), City of Westminster (3 miles north), Marylebone (4 miles north), Kensington (4 miles north-west), St Pancras (4 miles north) and Shoreditch (5 miles north-east).
Near you in Clapham
Typical jobs here are in homes near Lambeth Academy, Larkhall Park and Trinity Academy, among other places. Clapham has its own railway station: Clapham High Street station. Nearby you will also find Baynard's Castle (3.5 miles north-east) and Harrods (2.6 miles north-west). Open spaces near Clapham include Battersea Park Lake and Knight's Hill.
Different surfaces, different methods
Windows & doors
Wrong-coloured or messy mastic can be replaced for appearance too, matched to the frame colour.
Movement & expansion joints
A movement joint must be able to stretch. Failed sealant is cut out, backing rod or tape is fitted and the joint resealed.
What happens on the day
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a typical bath or shower, longer where several layers have been applied. For a job in Clapham, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First we work out whether the problem is the sealant, movement or a leak.
- Old beads and residue are removed down to clean surfaces.
- We treat any mould and dry the joint thoroughly.
- The right product goes in, with backing where the joint moves.
- We finish neatly and point out anything that needs another trade.
Preparing for the visit
- Let us know about parking restrictions
- Clear items away from the joints we’re working on
- Keep children and pets away from the work area
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work.
Advice
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Clapham, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
FAQs for Clapham
Do you take on hotel work around Clapham?
Yes. Hotel and guest-house work is part of what we do. Jobs can be programmed room by room, with out-of-hours working possible to arrange.
Can parking be tricky for a visit in Clapham?
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.
Can I choose the sealant colour?
We help you choose a colour that suits. The product needed can limit the range.
How long will it take to strip and reseal the joint?
Allow a few hours, depending on how many layers have to come out. We will give you a timescale when we quote.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Clapham.
When something else is needed
Before you book, it’s worth knowing the limits:
- Cracks in the fitting rather than the joint
- Sealant in an older building that needs testing for asbestos first
- Leaks from a shower valve, waste or pipework (a plumber’s job)
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Leaking tray & enclosure joints
- Expansion joints
- Failed movement joints
- Shrunken worktop sealant