Greater London · England
West Dulwich Commercial Sealant
Commercial sealant across West Dulwich and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Whole floors of tired en suites
- Repeated reseals that don’t last
- Water marks on ceilings under bathrooms
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Commercial sealant in West Dulwich, done properly
We fit the work around your building. Rooms can be done one at a time, floor by floor or in batches, and early starts or out-of-hours working can be arranged. We’re often asked to deal with leaking joints in shower rooms and changing areas and silicone laid over old silicone by a previous contractor, on welfare facilities, retail & leisure sites and student & care accommodation.
In London’s blocks of flats, service risers and common parts have pipes and cables passing through walls and floors. In West Dulwich, building managers may need both fire-rated sealant around those openings and new sealant in shared washrooms.
Each job carries a 12-month guarantee, large or small.
- Where
- West Dulwich (SE21, SE27, SE19)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
West Dulwich questions
Do you work for hotels and guest houses in West Dulwich?
Yes, we work for hotels as well as homes and businesses. Rooms can be done a few at a time, so the building stays open.
Is parking an issue for commercial sealant in West Dulwich?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you send RAMS and insurance details for our site?
Tell us what your site asks contractors for. We’ll confirm what we can supply before work is booked.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
How long do rooms need to be out of use?
Usually after around 24 hours. We give a cure time for each area.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Do you guarantee your work?
Yes, always. Each job is guaranteed for twelve months.
How much does commercial sealant cost in West Dulwich?
Size, access and the old material all affect the cost. Call for a quick quote.
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How we quote for commercial sealant
The price is agreed before any work begins. It’s based on:
- How many areas need sealing
- The type of sealant required
- How much there is to do
- Mould in or behind the old joints
Instead of a standard rate, 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 we need to know
There’s no need for technical detail. Just tell us:
- Any previous sealing or DIY work
- The address or postcode of the job
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
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 take it from there.
When something else is needed
It helps to know what we can’t do:
- Fire risk assessments or certification
- Water coming from plumbing rather than sealant
- Failed tanking or loose tiles behind the sealant
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Where we work in West Dulwich
- Rental portfolios
- Office washrooms & kitchens
- Retail & leisure sites
- Hotel bathrooms
- Welfare facilities
- Student & care accommodation
The process
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes as long as the scope needs, from one welfare room to a full building from start to finish. In West Dulwich, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We walk the site with you and agree the rooms, the order and the hours.
- Room by room, we protect the area and remove all the old sealant.
- Joints are cleaned, treated for mould and dried.
- Anti-fungal sanitary silicone goes into wet areas, with suitable sealants elsewhere.
- Rooms are checked and returned with a cure time so staff know when to use them.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Read more
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Ask cleaners to go gently on the silicone
- Note the date each area was done
- Report broken fans quickly
- Pass on the cure time to whoever cleans the rooms
Strong chemicals and scourers wear silicone out faster. Ask cleaners to use mild products and soft cloths on the sealant.
Signs to look for: black spots in the silicone, corners lifting, staining on the ceiling below or a musty smell. Any of these means the joints need attention.
Why act early in West Dulwich
Sealant is easy to forget until an audit or inspection is due. Booking it in good time leaves room for the cure time before the visit. 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.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in West Dulwich
- We leave the area clean and tidy
- Sealant colour chosen to suit
- Anti-fungal sanitary silicone in wet areas
- Trusted Arbo and Everbuild sealants
Read what affects the cost and customer reviews.
For landlords and businesses
For anyone letting property in or around West Dulwich, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Commercial sealant in West Dulwich: local notes
London’s water is hard, which leaves limescale on sealant, grout and taps. Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange.
For site and facilities teams at buildings such as Dulwich Wood Primary School, washroom and kitchen sealant can be programmed around term times or opening hours. Rented homes near Sydenham Hill station change hands often, and sealant work can be quoted for a single flat or a whole portfolio. If you look after a church, hall or community building such as Church of St Stephen, halls and community kitchens see heavy use, and their sealant shows it.
West Dulwich is about 1 mile north-east of West Norwood, in Greater London. For commercial sealant in and around West Dulwich, please ring 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Greater London. West Dulwich is one of 764 towns and villages in Greater London where we work.
Every address in SE21, SE27 and SE19 is within our area for commercial sealant. You’ll find streets such as Berry Lane, Clive Road and Myton Road. You’ll find West Dulwich on the A2199, which makes it straightforward to reach. If you’re just outside West Dulwich, we cover Sydenham Hill (1 mile east), West Norwood (1 mile south-west), Gipsy Hill (1 mile south), Dulwich (1 mile north) and Upper Norwood (1 mile south). Further out, we also cover London (5 miles north), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (6 miles north).
Around West Dulwich
Around West Dulwich, our work takes us to homes and buildings near The Wood House, Dulwich Prep & Senior and Kingsdale Foundation School and the streets around them. West Dulwich has its own railway station: Sydenham Hill station. A little further out are British Vintage Wireless And Television Museum (within half a mile west) and St Christopher's Hospice (1.3 miles south-east). The countryside around West Dulwich includes Battersea Park Lake and Dulwich Upper Wood.