Greater London · England
Underhill Remedial Sealant
Remedial sealant for Underhill, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Wide, uneven beads that look worse than the old ones
- Over-sealed joints coming away
- Worktop sealant that has shrunk and split
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Ask why a joint failed before redoing it
- Always have old sealant cut out, not covered
- Keep the room well ventilated
- Keep bleach and abrasives off the bead
Go easy on the new sealant: no scraping, scouring pads or harsh chemicals.
A split movement joint lets rain into walls and floors, and left long enough, the edges of the joint can crumble. Resealing while the edges are sound is simpler.
Remedial sealant in Underhill
Some sealant jobs aren’t a simple reseal, because someone has already had a go. Silicone laid over silicone, smears across tiles, the wrong product in a moving joint or mould trapped underneath all have to come out before the joint can be done properly. We work on shrunken worktop sealant, expansion joints and leaking tray & enclosure joints, and people most often call us about sealant applied over old sealant that has lifted and wide, uneven beads that look worse than the old ones.
Across London, a large share of homes are flats, conversions or mansion blocks, so a bathroom is often directly above a neighbour’s ceiling. That makes worn sealant and cracked grout in Underhill more than a cosmetic job.
Whatever the size of the job, it’s backed by our 12-month guarantee in Underhill and across Greater London.
- Location
- Underhill (EN5, N20)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Underhill
What else we do in Underhill
Why deal with it now?
Another bead over the top will not fix a failed joint. It can’t bond to what’s underneath, leaving the leak in place and one more layer to cut out later. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
Why book with us
- Old sealant always removed completely
- Experience in homes, commercial sites and hotels
- 12-month guarantee on every job
- 20+ years of sealant experience
See what affects the cost and customer reviews.
What remedial sealant looks like in Underhill
In a London flat, water from a failed bath or shower seal can reach the neighbours below, which is why it’s worth fixing early. London’s water is hard, so limescale builds up on sealant, grout and fittings.
Underhill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near St John the Baptist Church, bathrooms in older houses have often been refitted more than once, with sealant laid over sealant.
Underhill is about 1 mile west of Barnet, in Greater London. If you need remedial sealant in Underhill, please call 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base. We cover 764 towns and villages across Greater London, from the larger towns to small villages. We also work in London, around 11 miles away.
Work in EN5 and N20 is quoted and booked the same way as anywhere else. If you need remedial sealant at a property on Park Road, May's Lane and Manor Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for remedial sealant include Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). We also work in nearby towns such as London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
Near you in Underhill
We work in homes and buildings around Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub. For rail, the closest station is New Barnet station, roughly 1 mile east. Nearby you will also find Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). The countryside around Underhill includes Greenhill Gardens and Darland's Lake.
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a typical bath or shower, longer where several layers have been applied. In Underhill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- The failure is looked at first, so we know whether it’s sealant, movement or water from elsewhere.
- Each layer is cut out and the residue cleaned off.
- We treat any mould and dry the joint thoroughly.
- The right product goes in, with backing where the joint moves.
- The joint is tooled and you’re told about anything else we found.
Before we arrive
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
- Let us know about parking restrictions
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Read more
How we quote for remedial sealant
The price is agreed before any work begins. It’s based on:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- Access and height
- How much there is to do
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
Photos by email are helpful but not essential. Please mention:
- The type of property
- If someone has resealed it before
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Honest limits
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Water damage behind tiles that needs a tiler
- Cracks in the fitting rather than the joint
- 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 call 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Leaking tray & enclosure joints
- Botched or over-sealed joints
- Expansion joints
- Failed movement joints
- Shrunken worktop sealant
- Mouldy bath & shower sealant
Common questions in Underhill
Is parking an issue for remedial sealant in Underhill?
Parking in Underhill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for landlords with property near New Barnet station?
Yes. We work for letting agents and landlords as well as homeowners. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
What does remedial sealant cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Can old silicone be taken off without scratching the tiles?
Yes. Residue is removed with a product suited to the surface rather than scraped hard.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses.
Can you match the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Should I try it myself 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 matched to the joint and its conditions, then guaranteed for a year.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
When to call us in Underhill
Products get mixed up: caulk where it gets wet, rigid sealant where things move, or an acetoxy silicone on a surface it can mark. Each fails in its own way.
The problems people generally mention when they call include:
- Floor or wall movement joints that have failed
- Decorators’ caulk around a bath or shower
- Gaps opening along the back of the worktop
- Leaks that keep coming back after resealing
Schools such as St Catherine's RC School are buildings too, and its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- How much experience the applicator has
- What the quote includes, VAT included or not