Greater London · England
Remedial sealant & repairs in Harrow, Greater London
Specialist remedial sealant for Harrow: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Wide, uneven beads that look worse than the old ones
- Beads that never stuck properly
- Black mould underneath the bead
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Always have old sealant cut out, not covered
- Ask why a joint failed before redoing it
- Keep the room well ventilated
- Check trays and worktops don’t move
Go easy on the new sealant: no scraping, scouring pads or harsh chemicals.
Movement joints that have split let water into the structure, and left long enough, the edges of the joint can crumble. A joint with sound edges is far easier to reseal.
Remedial sealant in Harrow
A movement joint stops working when its sealant splits or sets hard. The old sealant comes out and backing goes in to control the depth, then a flexible sealant matched to the movement goes in. If you are dealing with wide, uneven beads that look worse than the old ones and products that weren’t meant for the joint, we can put it right, whatever the surface.
In much of London, period terraces have been converted into flats over the years, and bathrooms were often squeezed into small rooms. A compact bathroom that steams up every day is hard on silicone and grout.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Location
- Harrow (HA2, HA1, UB5, HA3)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Windows & doors
A frame that keeps leaking may not be the mastic. We check the joint and tell you if it looks to be something else.
Over-sealed & botched joints
Previous removal attempts can leave scratches or gouges. We work carefully to avoid adding to it, and point out any existing damage.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
What happens if it’s left?
Ripping out a bathroom isn’t normally needed. When the fittings are sound, stripping and resealing the joints is often enough. If they’re not, we will tell you. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- Full insurance on every job
- Old sealant always removed completely
- 180+ five-star Google reviews
- Sealant colour chosen to suit
What we are called out for in Harrow
Water from somewhere else can ruin a good seal. A slow leak behind the tiles soaks the joint from the back, and the sealant lifts or goes mouldy from underneath.
Common reasons people contact us include:
- Wide, uneven beads that look worse than the old ones
- Worktop sealant that has shrunk and split
- Movement joints that have split or pulled away
- Sealant that came away because the surface wasn’t prepared
Managing a site like Whitmore High School? Then washroom and kitchen sealant there needs the same care as at home, and schools and businesses are part of our work as well as homes.
What your quote should include
- What happens if they find a problem under the old sealant
- Is VAT in the price?
- Are they insured?
- Whether you can choose the colour
Towns and villages near Harrow
Other services in Harrow
Bathrooms and kitchens in Harrow
London has hard water, which leaves limescale on sealant, grout and taps. 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.
If you live in an older home near Church of St Peter, older homes can move a little, which is hard on rigid grout and tired sealant. Letting a property close to Harrow-on-the-Hill station? Then botched sealant from a previous quick fix is easier to strip out between tenants.
Harrow is about 7 miles south of Watford, in Greater London. Jobs in Harrow get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 764 places in Greater London are on our list. We also work in London, around 12 miles away.
We cover every part of HA2, HA1, UB5 and HA3 for remedial sealant. Remedial sealant is available to properties on High Street, London Road and Perceval Square. Harrow is on the B457 and B458, which makes it straightforward to reach. If you’re just outside Harrow, we cover Roxeth (1 mile south), South Harrow (1 mile south), North Harrow (1 mile north-west), Harrow on the Hill (1 mile south-east) and Rayners Lane (1 mile west). Within a short drive, we also cover London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (10 miles south-east), Kensington (8 miles south-east), St Pancras (11 miles east) and Shoreditch (12 miles east).
Around Harrow
Around Harrow, our work takes us to homes and buildings near Kingsfield Arms, Grange Primary School and Northwick Park and the streets around them. The nearest railway station is Harrow-on-the-Hill station, about 0.7 miles north-east of the centre. Nearby you’ll also find St. George's Shopping Centre (0.7 miles north-east) and Clementine Churchill Hospital (1 mile south-east). Green spaces nearby include Islip Manor Meadows and Northala Fields.
Honest limits
In fairness, there are a few things sealant will not fix:
- Sealant in an older building that needs testing for asbestos first
- A tray or worktop that needs refixing first
- A leaking trap, valve or supply pipe
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Failed movement joints
- Botched or over-sealed joints
- Expansion joints
- Mouldy bath & shower sealant
- Leaking tray & enclosure joints
- Shrunken worktop sealant
The process
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes a few hours for most joints, depending on how much old sealant has to come out for a typical job. In a London area like Harrow, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We start by checking the joint for movement, leaks and the reason it failed.
- All the old sealant comes out, including any layers underneath.
- We clean the joint, treat any mould and let it dry.
- Where the joint moves, backing and a flexible sealant suited to the movement go in.
- Finally we finish the joint and talk you through what we found.
Before we arrive
- Mention any tricky access
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Advice
Questions from Harrow
Could a tired shower seal in my Harrow flat affect the neighbours below?
Yes. In a flat, water from a failed bath or shower seal has only one way to go, and that’s down. A proper reseal before the leak starts is the easy fix.
Is parking an issue for remedial sealant in Harrow?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Someone resealed my shower and it’s leaking again. Can you help?
Yes. There’s normally a reason: sealant over sealant, movement or another leak, and we deal with the cause first.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Does remedial work come with a guarantee?
Yes. Remedial work carries the same 12-month guarantee as all our work.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How do I get a quote for remedial sealant in Harrow?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or email us and tell us what needs doing and where.
Where are you based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.