Greater London · England
Remedial sealant & repairs in Forest Hill, Greater London
Removing failed, mouldy or leaking sealant and putting it right for homeowners, landlords and businesses in Forest Hill. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Beads that never stuck properly
- Sealant applied over old sealant that has lifted
- Decorators’ caulk around a bath or shower
Remedial sealant in Forest Hill, done properly
Movement and expansion joints fail when the sealant can’t stretch. The old sealant comes out and backing goes in to control the depth, then a flexible sealant matched to the movement goes in. Typical jobs include repeat leaks from the same joint and beads that never stuck properly, on mouldy bath & shower sealant, leaking tray & enclosure joints and shrunken worktop sealant.
Hard London water leaves limescale on sealant, grout and taps alike. In Forest Hill, remedial sealant is as much about a room looking cared for as about keeping water out.
Whatever the size of the job, you get the same one-year guarantee in Forest Hill and across Greater London.
- Place
- Forest Hill (SE23, SE22, SE26)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Forest Hill
We don’t publish a price list, because no two jobs are the same. What we look at:
- Whether old sealant or filler has to be cut out
- The type of sealant required
- How easy the joints are to reach
- The size of the job
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- The rough size of the job
- Access, such as stairs, a lift or height
- A few pictures by email, if you can
- Where the property is
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear quote before any work starts.
The process
You do not need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes a few hours, depending on how many layers have to come out for a typical job. In a London area like Forest Hill, 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 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
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
- Tell us if parking is tricky
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or send us an email.
Advice
What happens if it’s left?
A joint that has failed twice will fail again unless the cause is dealt with. Taking time to find the cause, whether it’s movement, a leak or the wrong product, is what stops it happening again. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why book with us
- 20+ years of sealant experience
- Approved under the ARBOMaster scheme
- Domestic, commercial and hotel work
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide or our reviews.
Different surfaces, different methods
Windows & doors
Wrong-coloured or messy mastic can be replaced for appearance too, matched to the frame colour.
Mouldy bath & shower sealant
Mould that has grown into silicone doesn’t clean out for good. The sealant is cut out completely, the joint treated with a mould remover and dried before anti-fungal sanitary silicone goes in.
Common problems we fix in Forest Hill
Some joints fail because water is reaching them from behind. A leaking valve, a failed waste or cracked grout feeds water behind the bead, and the sealant lifts or goes mouldy from underneath.
The most common problems we see are:
- Worktop sealant that has shrunk and split
- Sealant peeling off a dusty or damp surface
- Smears and lumps from a botched reseal
- Floor or wall movement joints that have failed
If you let a flat or house near Honor Oak Park station, botched sealant from a previous quick fix is easier to strip out between tenants.
Before booking anyone
- What insurance they hold
- How the colour is chosen
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured for the work.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Forest Hill homes and their sealant
London has hard water, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in. London has a lot of flats and conversions, and a failed shower or bath seal in one can show up on the ceiling below, which is why it’s worth fixing early.
If you live in an older home near Honor Oak Christian Fellowship Centre, bathrooms in older houses have often been refitted more than once, with sealant laid over sealant. As a London address, Forest Hill can be tricky for parking: let us know about parking bays, permits or a driveway.
Forest Hill is about 2 miles south-east of East Dulwich, in Greater London. For remedial sealant in and around Forest Hill, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London. Our Greater London coverage runs to 764 places, Forest Hill among them.
We work across SE23, SE22 and SE26 for remedial sealant. That includes homes and businesses on Ewart Road, London Road and Rojack Road and the roads around them. Close by, we work in Honor Oak (1 mile north), Perry Vale (1 mile south-east), Brockley (1 mile north-east), Crofton Park (1 mile north-east) and Dulwich (1 mile west). Within a short drive, we also cover London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (6 miles north-west) and Shoreditch (6 miles north).
Around Forest Hill
Around Forest Hill, our work takes us to homes and buildings near Allenby Tutorial Trust, Capitol Cinema pub and Harris Girls' Academy East Dulwich, among other places. For rail, the closest station is Honor Oak Park station, roughly 0.5 miles north-east of the centre. Other landmarks nearby include Greenwich Castle (3.1 miles north-east) and Horniman Museum and Gardens (0.5 miles south-west). Not far away are One Tree Hill and Knight's Hill.
Looking after it afterwards
Aftercare is simple:
- Check trays and worktops don’t move
- Never fill a movement joint with mortar or grout
- Ask why a joint failed before redoing it
- Keep the room well ventilated
Clean gently: a mild cleaner and a soft cloth, with no blades or scourers.
Warning signs: sealant lifting at the ends, a second bead visible on top of the first, black mould under the silicone, or stains below a bathroom. Each one is worth getting looked at.
Nearby places to Forest Hill
What else we do in Forest Hill
FAQs for Forest Hill
I live in a flat in Forest Hill. Can a failed seal leak into the flat below?
Yes. In a flat, water from a failed bath or shower seal has only one way to go, and that is down. A proper reseal before the leak starts is the easy fix.
Can parking be tricky for a visit in Forest Hill?
Parking in Forest Hill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Someone sealed over the old bead. Can you fix it?
Yes. It’s slower than a standard reseal, because every layer has to come out cleanly, but it’s what makes the new bead last.
Can you strip sealant from an acrylic tray safely?
Yes, with care. We cut and lift the old sealant with tools suited to the surface, and the residue is cleaned away. Any existing damage is pointed out before any work starts.
How long will it take to strip and reseal the joint?
The number of joints and layers decides it. We will tell you before work begins.
Can you reseal a split movement joint?
Yes. Where mortar or filler has been used instead of sealant, it’s removed where it can be, and reseal with a flexible product.