Greater London · England
Remedial sealant & repairs in Mill Hill, Greater London
Removing failed, mouldy or leaking sealant and putting it right for homes and businesses in Mill Hill and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Products that weren’t meant for the joint
- Floor or wall movement joints that have failed
- Thick, messy sealant smeared over tiles
Aftercare tips
So the new joints stay in good condition:
- Keep movement joints clear of mortar and paint
- Check ceilings under showers for marks
- Ask why a joint failed before redoing it
- Clean sealant with mild products only
Do not let anyone seal over it later. New silicone doesn’t bond to old, so the old bead should always come out first.
Leaks through failed sealant grow over time. Each use pushes more water behind the bead, into floors, walls or ceilings. Early action keeps it to a sealant job.
How we handle remedial sealant in Mill Hill
Decorators’ caulk in a shower, bathroom silicone on a window, a rigid filler in a movement joint won’t last, however tidy it looks. We take it out and use a sealant made for that joint. If you have beads that never stuck properly and floor or wall movement joints that have failed, we can help, whatever the surface.
Hard London water leaves limescale on sealant, grout and taps alike. In Mill Hill, remedial sealant is as much about a room looking cared for as about keeping water out.
The work is covered for a year after we finish. If anything is not right with it, phone 0345 464 0079 or drop us an email.
- Location
- Mill Hill (NW7, N20)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Mill Hill
Joint depth matters. A bead bonded on three sides, or laid too thick, cannot flex, and tears at the first real movement. Backing sets the depth and stops that.
These are the problems we are asked about most:
- A second bead peeling off the first
- Sealant that came away because the surface wasn’t prepared
- Caulk or the wrong sealant used in a wet area
- Movement joints that have split or pulled away
For site and facilities teams at buildings such as St Paul's CofE Primary School NW7, we reseal washrooms and kitchens in schools and businesses as well as homes.
Before booking anyone
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
- How the colour is chosen
- Is VAT in the price?
What happens on the day
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. The work usually takes a few hours for a typical bath or shower, longer where several layers have been applied. For a job in Mill Hill, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We protect the surfaces around the joint.
- Every layer of failed sealant is stripped out.
- The joint is degreased and checked for movement and leaks.
- New sealant goes in once the joint is dry, and is tooled smooth.
- You get the cure time and our view on why the joint failed.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Get a quote
Want a quote for remedial sealant? Please phone 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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Different surfaces, different methods
Worktops & kitchens
Kitchen joints hold grease and residue, so we spend extra time cleaning before resealing.
Leaking trays & enclosures
A shower that leaks after resealing often has a tray that moves or an enclosure sealed on the wrong side. Both are checked before we reseal.
Quotes for remedial sealant in Mill Hill
Every job gets its own quote. These are the things that affect it:
- When we can work, for business premises
- The amount of work
- How many rooms, windows or areas are involved
- Access and height
Rather than a set price list, 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.
What to tell us for a quote
To help us quote quickly, let us know:
- If someone has resealed it before
- Where the job is, and your postcode
- The rough size of the job
- How we’d reach the joints
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Your questions about remedial sealant in Mill Hill
Do you work for landlords with property near Mill Hill Broadway station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
I live in a flat in Mill Hill. Can a failed seal leak into the flat below?
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. It’s far simpler to replace tired sealant early than to deal with a neighbour’s ceiling.
Do you work in Mill Hill?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Mill Hill included.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we’ll tell you the cure time.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. We’ll ask anything else we need to know.
Can I choose the sealant colour?
In most cases you can choose. We’ll explain which colours are available.
What remedial sealant looks like in Mill Hill
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, which leaves limescale on sealant, grout and taps, and it has to be cleaned off before new sealant goes in.
For landlords with property near Mill Hill Broadway station, failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak. If you live in an older home near St Paul's Church, walls and floors in older homes can move, and sealant and grout show it first.
Mill Hill is about 1 mile north-east of Burnt Oak, in Greater London. Anywhere in NW7, we cover remedial sealant for homes and businesses. We cover 764 towns and villages across Greater London. You can also see our page for London, about 10 miles away.
Our applicators cover all of NW7 and N20 for remedial sealant. Whether your property is on Daws Lane, Byron Road and High Street or a nearby road, our applicators can take on the job. We also cover the places around Mill Hill: The Hale (1 mile west), Burnt Oak (1 mile south-west), Grahame Park (1 mile south), Totteridge (2 miles north-east) and Edgware (2 miles west). We also work in nearby towns such as London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (8 miles south), St Pancras (8 miles south-east) and Shoreditch (9 miles south-east).
Around Mill Hill
We work in homes and buildings around Mill Hill School, Copthall School and Bittacy Hill Park. Nearby too are Francis Skaryna Belarusian Library and Museum (2 miles east) and Rising Sun pub (0.7 miles north-west). Mill Hill’s nearest station is Mill Hill Broadway station, roughly 1 mile south-west. A little further out are Broadwalk Centre (2 miles west) and Francis Skaryna Belarusian Library and Museum (2 miles east). Not far away are The Mill Field and Darland's Lake.
Landlords, agents and businesses in Mill Hill
If you manage several properties in or around Mill Hill, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
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.