Greater London · England
Remedial Sealant in Upper Holloway
Remedial sealant for Upper Holloway and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Beads that never stuck properly
- Mould trapped under a layer of silicone
- Sealant applied over old sealant that has lifted
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
About our remedial sealant in Upper Holloway
Movement and expansion joints fail when the sealant cannot stretch. The old sealant comes out and backing goes in to control the depth, then a flexible sealant matched to the movement goes in. If you are dealing with a second bead peeling off the first and torn expansion joints, we can put it right.
London homes include a lot of flats, conversions and mansion blocks, so a bathroom is often directly above a neighbour’s ceiling. In Upper Holloway, that’s a good reason to put tired sealant and grout right early.
All of our work is guaranteed for twelve months.
- Where
- Upper Holloway (N19, N7, N6)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Upper Holloway
Stripping out botched sealant adds time to a reseal, but rarely a lot: it takes a few hours, depending on how many layers have to come out. Compared with chasing the same leak every few months, it’s time well spent. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Upper Holloway, the repair is bigger than a sealant job.
Instead of a standard rate, 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.
Why us?
- Sealant colour chosen to suit
- White, clear, grey or another colour, product permitting
- Experience in homes, commercial sites and hotels
- Any old sealant cut out fully, not covered over
Take a look at our cost guide or customer reviews.
Upper Holloway: your questions answered
Can parking be tricky for a visit in Upper Holloway?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can worn sealant in a flat in Upper Holloway 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. Replacing the sealant and grout before that happens is much less trouble than repairing a neighbour’s ceiling.
Where is Mr Mastic based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
My shower still leaks after a reseal. Can you sort it?
Yes. There’s normally a reason: sealant over sealant, movement or another leak, so we find that first.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
Remedial sealant around Upper Holloway
London’s water is hard, which leaves limescale on sealant, grout and taps, 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.
As a London address, Upper Holloway can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you look after a building such as St John's Upper Holloway CofE Primary School, its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. We provide remedial sealant to householders, landlords and businesses in Upper Holloway and nearby, as part of our work across Greater London. Across Greater London, we cover 764 places, and Upper Holloway is one of them.
Here we cover the N19, N7 and N6 postcode area for remedial sealant. We cover properties on Ward Road, Kiver Road and Foxham Road. Being close to the A103, Upper Holloway is easy for our applicators to reach for remedial sealant. Close by, we work in Tufnell Park (1 mile south), Dartmouth Park (1 mile south-west), Highgate (1 mile north-west), Nag's Head (1 mile south-east) and Holloway (1 mile south-east). Further out, we also cover London (5 miles south), City of Westminster (4 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Near you in Upper Holloway
Locally, jobs take us to homes and businesses close to City of London Academy, Whittington Park and The Mother Red Cap pub. Nearby too are Asanté Academy of Chinese Medicine (1.2 miles north-west) and Vaughan Williams Memorial Library (2 miles south). There’s a railway station in Upper Holloway itself: Upper Holloway station. Nearby you’ll also find The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). Not far away are Dartmouth Park Hill and Parkland Walk.
Aftercare tips
A little care helps the new joints last. We recommend:
- Always have old sealant cut out, not covered
- Check ceilings under showers for marks
- Run the fan after every shower
- Use a soft cloth, not a scourer, on silicone
If the joint ever needs renewing, have it cut out, not sealed over. New silicone doesn’t bond to old, so the old bead should always come out first.
Movement joints that have split let water into the structure, and the longer it’s left, the more the joint edges break down. Resealing while the edges are sound is simpler.
Landlords, agents and businesses in Upper Holloway
We also work for property managers and facilities teams. Several sites can go on one quote, and we’re fully insured for the work.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
When it is not the sealant
In fairness, some problems need a different trade:
- Failed tanking or loose tiles behind the sealant
- Movement from fittings that are not supported
- Plumbing leaks behind walls or under trays
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before booking.
Where we work in Upper Holloway
- Failed movement joints
- Shrunken worktop sealant
- Expansion joints
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Leaking tray & enclosure joints
Signs you need remedial sealant in Upper Holloway
Even good sealant ages. Over the years it shrinks, hardens and gets colonised by mould. At that point it has to come out.
People normally contact us after spotting something like this:
- Beads that never stuck properly
- Over-sealed joints coming away
- Floor or wall movement joints that have failed
- Repeat leaks from the same joint
Letting a property close to Upper Holloway station? Then botched sealant from a previous quick fix is easier to strip out between tenants.
Comparing quotes
- Whether VAT is included
- Whether they’re fully insured
- How hidden problems are handled
- Who does the work, and how experienced they are
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for most joints, depending on how much old sealant has to come out. For a job in Upper Holloway, 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.
- We start by checking the joint for movement, leaks and the reason it failed.
- All the old sealant comes out, including any layers underneath.
- The joint is cleaned, treated for mould and left to dry.
- Where the joint moves, backing and a flexible sealant suited to the movement go in.
- Finally we finish the joint and talk you through what we found.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
Ask for a quote
For remedial sealant in Upper Holloway, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.