Greater London · England
Remedial sealant & repairs in Friern Barnet, Greater London
Removing failed, mouldy or leaking sealant and putting it right for homes and businesses in Friern Barnet and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Dark patches showing through the sealant
- Decorators’ caulk around a bath or shower
- Kitchen joints letting water behind the worktop
Quotes for remedial sealant in Friern Barnet
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- How much there is to do
- How easy the joints are to reach
- Whether there’s mould to deal with
- The product the joint needs
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Asking for a quote
When you contact us, these details help:
- Roughly how big the job is
- The address or postcode of the job
- Photos by email, if that is easy
- Any access issues, like height or stairs
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or send us an email.
Remedial sealant for homes and businesses in Friern Barnet
Movement and expansion joints fail when the sealant can’t stretch. We cut out the failed sealant and set the depth with backing, then a flexible sealant matched to the movement goes in. We’re often asked to deal with floor or wall movement joints that have failed and gaps opening along the back of the worktop, across shrunken worktop sealant, botched or over-sealed joints and mouldy bath & shower sealant.
London’s water is hard, so limescale builds up along sealant lines, in grout and on fittings. In Friern Barnet, remedial sealant is as much about a room looking cared for as about keeping water out.
All of our work is guaranteed for twelve months.
- Where
- Friern Barnet (N11, N12, N10, N20)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Friern Barnet homes and their sealant
London’s water is hard, which leaves limescale on sealant, grout and taps. 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.
In the older streets around St John's Church, older homes can move a little, which is hard on rigid grout and tired sealant. Friern Barnet is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Friern Barnet is about 2 miles north-east of Finchley, in Greater London. Every kind of property in Friern Barnet is covered for remedial sealant, old or new, large or small. The work is guaranteed for a year. Friern Barnet is one of 764 towns and villages in Greater London where we work. Our London page covers work nearby.
Postcode districts we cover here for remedial sealant: N11, N12, N10 and N20. You will find streets such as Martock Gardens, Shapwick Close and Radstock Close, all of which we cover. Friern Barnet is on the A406 and B550, so it’s easy for us to get to with everything needed for remedial sealant. Neighbouring places we cover for remedial sealant include New Southgate (1 mile east), Brunswick Park (1 mile north), North Finchley (1 mile west), Arnos Grove (1 mile east) and Whetstone (1 mile north-west). Within a short drive, we also cover London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south-east).
Local landmarks in Friern Barnet
Locally, jobs take us to homes and businesses close to Francis Skaryna Belarusian Library and Museum, Friary Park and Friern Barnet School and the streets around them. Friern Barnet has its own railway station: New Southgate station. Nearby you’ll also find Francis Skaryna Belarusian Library and Museum (1.4 miles west) and Grand Arcade (1 mile west). Open spaces near Friern Barnet include Highgate Hill and Darland's Lake.
FAQs for Friern Barnet
I live in a flat in Friern Barnet. Can a failed seal leak into the flat below?
Yes. In a flat, water from a failed bath or shower seal has only one way to go, and that is down. Cutting out the old sealant and laying a new bead early stops it getting that far.
I let a flat near New Southgate station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
How long should I leave it?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Can failed expansion joints be resealed?
Yes. Failed movement joints are cut out and resealed with backing and a flexible sealant suited to the movement.
Can I choose the sealant colour?
In most cases you can choose. We will explain which colours are available.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
What if the leak is not the sealant?
You’ll hear it from us. If it’s a cracked tray, a failed valve or a leaking waste, resealing will not fix it, so we won’t pretend it will.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Why act early in Friern Barnet
Ripping out a bathroom is not generally needed. If the bath, tray and tiles are sound, remedial resealing usually puts it right. If they’re not, we’ll tell you. 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. Putting it right early is much less trouble.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Why us?
- Colour agreed with you before we start
- We never seal over old sealant
- Rated 4.9 stars on Google
- Anti-fungal silicone where joints get wet
Read our cost guide or what customers say.
What sealant work cannot fix
New sealant can’t fix everything, and we will tell you before we start. It will not solve:
- Failed tanking or loose tiles behind the sealant
- Older mastics that may need an asbestos check before removal
- A tray or worktop that needs refixing first
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before you book.
What we seal
- Expansion joints
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Failed movement joints
- Shrunken worktop sealant
- Leaking tray & enclosure joints
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
The process
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for most joints, depending on how much old sealant has to come out. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Friern Barnet. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- We finish neatly and point out anything that needs another trade.
How to prepare
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
Advice
When to call us in Friern Barnet
Some joints fail because water is reaching them from behind. A leaking valve, a failed waste or cracked grout feeds water behind the bead, and the sealant lifts or goes mouldy from underneath.
Signs it’s time to call us include:
- Gaps opening along the back of the worktop
- Floor or wall movement joints that have failed
- Over-sealed joints coming away
- Caulk or the wrong sealant used in a wet area
If you let a flat or house near New Southgate station, botched sealant from a previous quick fix is easier to strip out between tenants.
Comparing quotes
- Whether you can choose the colour
- How long to leave it before use
- Whether all the old sealant comes out first
- How much experience the applicator has
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Do not point over movement joints
- Do not add new sealant on top of old
- Check trays and worktops don’t move
- Get the cause of a repeat leak found before resealing
Keep the room ventilated: run the fan during and after showers, or open a window.
Leaks through failed sealant grow over time. Each use pushes more water behind the bead, into whatever is behind or below. Early action keeps it to a sealant job.