Greater London · England
Remedial sealant & repairs in South Harrow, Greater London
Removing failed, mouldy or leaking sealant and putting it right for homeowners, landlords and businesses in South Harrow. Fully insured, ARBOMaster approved and guaranteed for a year.
- Kitchen joints letting water behind the worktop
- Floor or wall movement joints that have failed
- Products that weren’t meant for the joint
How it works
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes a few hours, depending on how many layers have to come out in most cases. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in South Harrow. A visitor permit or a nearby bay makes the visit run more smoothly.
- We protect the surfaces around the joint.
- The botched or failed sealant is cut away completely.
- We clean and degrease the joint and look for signs of movement or water.
- Once dry, a suitable sealant is applied and tooled.
- You get the cure time and our view on why the joint failed.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Get a quote
Want a quote for remedial sealant? Please phone 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
About our remedial sealant in South Harrow
If a joint has been resealed and is leaking again, it’s worth a proper look. Send pictures when you call 0345 464 0079 or drop us an email. We are often asked to deal with mould trapped under a layer of silicone and wide, uneven beads that look worse than the old ones, across leaking tray & enclosure joints, expansion joints and shrunken worktop sealant.
In much of London, period terraces have been converted into flats over the years, and bathrooms were often squeezed into small rooms. Small, steamy rooms are where mould gets into sealant and grout fastest.
Each job carries a 12-month guarantee.
- Where
- South Harrow (HA2, HA1, UB5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near South Harrow
Also in South Harrow
What we’re called out for in South Harrow
Movement tears sealant that is not designed for it. Flexing baths, rocking trays and building movement joints will split a rigid or thin bead.
The problems people usually mention when they call are:
- Mould trapped under a layer of silicone
- Sealant peeling off a dusty or damp surface
- Products that weren’t meant for the joint
- Wide, uneven beads that look worse than the old ones
For site and facilities teams at buildings such as The Welldon Park Academy, we reseal washrooms and kitchens in schools and businesses as well as homes.
What your quote should include
- Who does the work, and how experienced they are
- Whether you can choose the colour
- The length of the guarantee
- Whether the sealant suits the joint
What we cannot put right
In fairness, some problems need a different trade:
- 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
- Movement from fittings that aren’t supported
If in doubt, phone 0345 464 0079 or email us and we will say what we think before booking.
Surfaces we seal
- Mouldy bath & shower sealant
- Shrunken worktop sealant
- Expansion joints
- Leaking tray & enclosure joints
- Failed movement joints
- Botched or over-sealed joints
What affects the cost of remedial sealant
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- The old material and how stubborn it is
- How many areas need sealing
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Helping us quote
To make quoting easier, let us know:
- The type of property
- The address or postcode of the job
- How we’d reach the joints
- A few photos by email, if you can
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Run the fan after every shower
- Don’t add new sealant on top of old
- Have loose fittings fixed before resealing
- Clean sealant with mild products only
If we’ve found a cause, such as a loose tray or a leaking waste, get it fixed, or the new joint may fail again.
If a joint has failed more than once, stop resealing it. Get the cause found first, otherwise the next attempt will fail too.
Common questions in South Harrow
I live in a flat in South Harrow. 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.
Is parking a problem for a job in South Harrow?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do you work for letting agents?
Yes, we do. We work in homes, commercial premises and hotels.
Can you match the sealant colour?
We will suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
Can you do several jobs on one visit?
Yes. Just list everything you need and we will quote it together.
What happens if the problem is the tray or the plumbing?
We check for that before we reseal. If the fault is elsewhere, you will know before any work is done.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can tenants book the work?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
How the job changes by surface
Over-sealed & botched joints
Thick, smeared sealant looks messy and hides problems. Taking it back shows what’s underneath, then reseal neatly.
Worktops & kitchens
Old kitchen sealant pulls back from the wall over time. We strip it, degrease the joint and reseal.
South Harrow homes and their sealant
South Harrow has hotels and guest accommodation nearby. As well as homes, we work in hotel bathrooms, where resealing and regrouting can be done room by room. London has a lot of flats and conversions, and a failed shower or bath seal in one can show up on the ceiling below, so tired sealant is best dealt with early.
Rented homes near Northolt Park station change hands often, and failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak. In the older streets around Parish Church of St Paul, timber floors under older bathrooms flex, so joints need a sealant that moves with them.
South Harrow is about 1 mile south of Harrow, in Greater London. Our applicators cover remedial sealant for homes and businesses in South Harrow and nearby. We cover 764 towns and villages across Greater London, from the larger towns to small villages. For nearby work, see our London page, about 12 miles away.
All of HA2, HA1 and UB5 is within our area for remedial sealant. Local streets include Park Lane, Grange Road and Dudley Road. Nearby, we also carry out remedial sealant in Roxeth (1 mile north-east), Harrow (1 mile north), Harrow on the Hill (1 mile east), Rayners Lane (1 mile north-west) and Northolt (1 mile south-west). We also work in nearby towns such as London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (8 miles south-east), St Pancras (10 miles east) and Shoreditch (12 miles east).
Around South Harrow
Locally, jobs take us to homes and businesses close to Orley Farm School, Northwick Park and St Dominic's Sixth Form College. The nearest railway station is Northolt Park station, roughly 0.5 miles south-west of the centre. Other landmarks nearby include St. George's Shopping Centre (1.3 miles north-east) and Kodak Museum (2 miles north). Green spaces nearby include Middle Lake and Northala Fields.
Can I do it myself?
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 doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.