Greater London · England
Nunhead Remedial Sealant
Our applicators work in Nunhead on removing failed, mouldy or leaking sealant and putting it right. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Sealant that came away because the surface wasn’t prepared
- Thick, messy sealant smeared over tiles
- Gaps opening along the back of the worktop
Remedial sealant for homes and businesses in Nunhead
If a joint fails again and again, something is causing it. Movement, the wrong product or a leak from somewhere else will beat any new bead. Finding that cause comes before any new sealant. We work on expansion joints, mouldy bath & shower sealant and shrunken worktop sealant, and people most often call us about smears and lumps from a botched reseal and decorators’ caulk around a bath or shower.
Much of London’s older housing is Victorian and Edwardian terraces, many of them now split into flats, and bathrooms were often squeezed into small rooms. Small, steamy rooms are where mould gets into sealant and grout fastest.
Each job carries a 12-month guarantee, large or small.
- Where
- Nunhead (SE15, SE4, SE14)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When it is not the sealant
Sealant isn’t the answer to every problem, and we will tell you before we start. Sealant will not put right:
- A bath, tray or worktop that moves until it’s properly fixed
- A leaking trap, valve or supply pipe
- Old mastic in a building from before 2000 that should be checked for asbestos before it’s disturbed
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Nunhead
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Expansion joints
- Shrunken worktop sealant
- Failed movement joints
- Leaking tray & enclosure joints
Signs you need remedial sealant in Nunhead
Silicone only bonds to surfaces that are clean and dry. Soap film, dust, damp or old residue stop it gripping, and the joint starts to come away early.
These are the problems we’re asked about most:
- Worktop sealant that has shrunk and split
- Decorators’ caulk around a bath or shower
- Black mould underneath the bead
- Wide, uneven beads that look worse than the old ones
Homes close to Saint Antony with Saint Silas include some older properties, and older homes can move a little, which is hard on rigid grout and tired sealant.
What to look for in a quote
- The length of the guarantee
- Whether all the old sealant comes out first
- How hidden problems are handled
- Which colour the sealant will be
Your questions about remedial sealant in Nunhead
Can worn sealant in a flat in Nunhead cause a leak downstairs?
Yes, it can. Water that gets past failed sealant or cracked grout can run under the bath or tray and show up on the ceiling below. It’s far simpler to replace tired sealant early than to deal with a neighbour’s ceiling.
I let a flat near Nunhead station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
What does remedial sealant cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Bathrooms and kitchens in Nunhead
London has hard water, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in. 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.
Nunhead is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For landlords with property near Nunhead station, failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak.
Nunhead is about 1 mile south-west of New Cross, in Greater London. Homes, rented property, offices and hotels in Nunhead can book us for remedial sealant. The work is guaranteed for a year. 764 places in Greater London are on our list, from the larger towns to small villages.
Work in SE15, SE4 and SE14 is quoted and booked the same way as anywhere else. Remedial sealant is available to properties on Rye Road, Nash Road and Kitto Road. If you are just outside Nunhead, we cover Telegraph Hill (1 mile north-east), Honor Oak (1 mile south), Peckham (1 mile north-west), New Cross (1 mile north-east) and Brockley (1 mile south-east). Within a short drive, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles west), St Pancras (5 miles north-west) and Shoreditch (5 miles north).
Around Nunhead
In Nunhead, that means homes and buildings near The Ivy House, Peckham Rye and Allenby Tutorial Trust. Nunhead has its own railway station: Nunhead station. Other landmarks nearby include Greenwich Castle (2.4 miles north-east) and Lewisham Shopping Centre (1.7 miles east). Green spaces nearby include Knight's Hill and One Tree Hill.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Leave it or put it right?
It’s easy to scratch acrylic, enamel or an uPVC frame cutting out old sealant, and the residue left behind stops the next bead bonding. Careful removal is most of a remedial job. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Fully insured
- Sealant colour chosen to suit
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced and customer reviews.
Places near Nunhead
Other services in Nunhead
How the visit works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. It usually takes a few hours for a typical bath or shower, longer where several layers have been applied. In a London area like Nunhead, the main things to plan are parking and access: 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.
- Mould is treated and the joint dried.
- We reseal with a product suited to the joint, backed where needed.
- We finish neatly and point out anything that needs another trade.
Before we arrive
- Mention any tricky access
- Clear the area around the work
- Try not to wet indoor joints just before the visit
Getting a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Advice
How the job changes by surface
Worktops & kitchens
If a worktop moves when you lean on it, the sealant will keep splitting. It needs fixing down first, which we will point out.
Mouldy bath & shower sealant
Mould often spreads under the bead as well as through it. Once it’s all removed, the joint is treated so the new sealant starts clean.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we are fully insured for the work.