Greater London · England
Northumberland Park Remedial Sealant
Specialist remedial sealant for Northumberland Park: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Movement joints that have split or pulled away
- A shower that leaks however often it’s resealed
- Mould trapped under a layer of silicone
When something else is needed
It helps to know what we cannot do:
- A cracked shower tray or bath (that needs repair or replacing)
- Failed tanking or loose tiles behind the sealant
- Movement from fittings that are not supported
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Northumberland Park
- Shrunken worktop sealant
- Expansion joints
- Leaking tray & enclosure joints
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Failed movement joints
About our remedial sealant in Northumberland Park
Water on the floor does not always mean failed silicone. A cracked tray, a failed shower valve or a leaking waste can look just the same. When the fault is elsewhere, we say so instead of resealing for the sake of it. We work on expansion joints, shrunken worktop sealant and botched or over-sealed joints, and people most often call us about repeat leaks from the same joint 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.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Northumberland Park (N17, N18)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Northumberland Park
More services for Northumberland Park
How the visit works
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a typical bath or shower, longer where several layers have been applied for a typical job. In a London area like Northumberland Park, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First we find out how and where the joint has failed.
- Every layer of old sealant is cut and cleaned out.
- Next, any mould is treated and the joint dried.
- Moving joints get backing and a flexible sealant to suit.
- We tool the joint and tell you about anything else that needs attention.
How to prepare
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Move anything stored near the joints
Get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Related advice
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How the job changes by surface
Windows & doors
Frames resealed over the top end up with hard, layered mastic. All of it is cut out and the frame and wall cleaned before backing and resealing.
Over-sealed & botched joints
Every layer has to come out, and silicone residue is cleaned off the tiles too. Only a clean joint will take a new bead.
Your questions about remedial sealant in Northumberland Park
Do you work for landlords with property near Northumberland Park (London) station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can parking be tricky for a visit in Northumberland Park?
Parking in Northumberland Park, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
How long does remedial resealing take?
It takes a few hours for a typical bath or shower, longer where several layers have been applied. We’ll give you a timescale when we quote.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Why it’s worth doing now in Northumberland Park
Adding more sealant is the usual quick fix, and it rarely works. It can’t bond to what’s underneath, leaving the leak in place and one more layer to cut out later. In a flat in Northumberland Park, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why book with us
- Rated 4.9 stars on Google
- 20+ years of sealant experience
- We agree the colour with you first
- Anti-fungal sanitary silicone in wet areas
Do you need remedial sealant in Northumberland Park?
Joint depth matters. Sealant packed too deep, or stuck to the back of the joint as well as the sides, cannot stretch, so it tears when the joint moves. Backing rod or bond-breaker tape prevents it.
These are the problems we are asked about most:
- Gaps opening along the back of the worktop
- Torn expansion joints
- Caulk or the wrong sealant used in a wet area
- Beads that never stuck properly
In the older streets around St Paul's Church, timber floors under older bathrooms flex, so joints need a sealant that moves with them.
Questions to ask before you book
- What product goes in the joint
- Who does the work, and how experienced they are
- What the quote includes, VAT included or not
- What preparation is included
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Do not point over movement joints
- Find out why the sealant failed first
- Report a tray that rocks or a worktop that lifts
- Act on a lifting corner straight away
Clean gently: no scraping, scouring pads or harsh chemicals.
Mould trapped under over-sealed joints spreads unseen. By the time it shows through, the joint is well past saving.
Bathrooms and kitchens in Northumberland Park
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.
Rented homes near Northumberland Park (London) station change hands often, and a joint that keeps failing is best fixed properly while the property is empty. Northumberland Park is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Northumberland Park is about 1 mile north-east of Tottenham, in Greater London. If you need remedial sealant in Northumberland Park, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Northumberland Park included. Across Greater London, we cover 764 places, Northumberland Park among them. For nearby work, see our London page (7 miles or so).
Jobs for remedial sealant in N17 and N18 works the same way as everywhere else we cover. If you need remedial sealant at a property on Love Lane, Park Lane and York Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for remedial sealant include Upper Edmonton (1 mile north-west), Edmonton (1 mile north), South Chingford (1 mile east), Picketts Lock (2 miles north-east) and Highams Park (2 miles east). Within a short drive, we also cover London (7 miles south), City of Westminster (7 miles south-west), Marylebone (7 miles south-west), Kensington (10 miles south-west), St Pancras (6 miles south-west) and Shoreditch (6 miles south).
What’s near Northumberland Park
We work in homes and buildings around Duke's Aldridge, No.8 Tottenham pub and London Academy of Excellence Tottenham and the streets around them. There’s a railway station in Northumberland Park itself: Northumberland Park (London) station. Well-known places in the area include North Middlesex University Hospital (0.9 miles north-west) and Markfield Beam Engine and Museum (1.6 miles south). The countryside around Northumberland Park includes Pole Hill and Highams Park Lake.