Greater London · England
Underhill Bathroom Resealing
Problem with your baths, showers and worktops in Underhill? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Damp behind the bath or under the tray
- Sealant that has split, shrunk or peeled away
- Smears of silicone across the tiles
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Keep an eye on the corners, where splits start
- Squeegee the walls and tray after use
- Don’t let bottles sit on the bead
- Give the silicone its full cure time
Keep water off the new bead until it has cured, following the cure time we give you. Once it’s cured, wiping it down after use keeps it looking new.
Watch for the early signs: lifting ends, gaps, dark shadows under the bead or a stain downstairs. Any of these means the joint needs attention.
How we handle bathroom resealing in Underhill
Homes in Underhill have the same weak spots as anywhere else: bath edges, tray joints, basin backs and kitchen upstands. Every joint is cut out, cleaned and left dry before it’s resealed. We work on basins & vanity units, baths and wet rooms, and the jobs we see most are splits where the tray meets the wall and water escaping at the shower enclosure.
London’s water is hard, so limescale builds up along sealant lines, in grout and on fittings. For a bathroom or kitchen in Underhill, getting the joints right keeps water where it belongs and the room looking clean.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Underhill (EN5, N20)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Underhill questions
Can you help a landlord with a rental near New Barnet station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Is parking a problem for a job 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 come to Underhill?
Yes. We’re based in Crawley and work across South East England, London and Scotland.
Is white the only colour available?
There’s a choice: clear, white and colours chosen to suit the room. We can help you pick when we quote.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
When can I use the bath or shower again?
The surface skins over fairly quickly, but the bead needs longer to cure right through. Keep water off it for around 24 hours, or follow the cure time we give you.
Can mouldy silicone be sorted out?
Yes. Mould inside the bead rarely cleans out for good, so we cut it out, treat the joint and reseal with anti-fungal silicone.
Different surfaces, different methods
Shower trays & enclosures
A tray that rocks will split any sealant. Movement is checked before anything is resealed, and if the tray needs refixing, we’ll say so.
Sinks & splashbacks
Next to the sink, the sealant has to cope with constant water, including a food-safe sealant where that’s needed. The joint is laid neatly so it’s easy to wipe.
Why deal with it now?
Tired sealant isn’t a reason to replace a bath or shower. A new bead often brings the whole room back, as long as the fittings themselves are sound. If we find a deeper problem, you will hear it from us. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Underhill, the repair is bigger than the sealant job would have been.
Leaving a failed joint normally makes the job bigger, not smaller. If you are not sure whether it needs doing, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Underhill
- Fully insured
- Anti-fungal sanitary silicone in wet areas
- A 12-month guarantee on all work
- We leave the area clean and tidy
Read our cost guide or customer reviews.
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take half a day or less for one room, longer when the kitchen is included. In Underhill, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, each joint is checked for movement and signs of water.
- The old silicone is cut out completely, along with the film it leaves on the tiles.
- The joint is cleaned, degreased and treated for mould.
- With the joint dry, and any bath loaded with water, a single bead of anti-fungal silicone is applied.
- The bead is tooled smooth and you’re told the cure time, generally around 24 hours.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
Get a quote
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before we start.
Advice
Nearby places to Underhill
More services for Underhill
Bathrooms and kitchens in Underhill
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. London’s water is hard, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in.
If you look after a building such as St Catherine's RC School, we reseal washrooms and kitchens in schools and businesses as well as homes. Underhill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around St John the Baptist Church, walls and floors in older homes can move, and sealant and grout show it first.
Underhill is about 1 mile west of Barnet, in Greater London. Jobs in Underhill get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Underhill is one of 764 towns and villages in Greater London where we work. You can also see our page for London, roughly 11 miles from Underhill.
Postcode districts we cover here for bathroom resealing: EN5 and N20. We cover properties on Park Road, May's Lane and Manor Road and the roads around them. We also cover 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). Larger places within reach include 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).
What’s near Underhill
Locally, jobs take us to homes and businesses close to Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub, among other places. Underhill’s nearest station is New Barnet station, roughly 1 mile east of the centre. A little further out are Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). For a walk, there’s Greenhill Gardens and Darland's Lake.
Quotes for bathroom resealing in Underhill
There’s no set price list. The quote depends on:
- Any working-time requirements on site
- Whether there’s mould to deal with
- The old material and how stubborn it is
- Access and height
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
To make quoting easier, let us know:
- The problem you’ve noticed
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Landlords, agents and businesses in Underhill
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.