Greater London · England
Glazing & conservatory sealant in West Dulwich, Greater London
Glazing silicone for conservatories, rooflights, glass panels and shower screens for householders, landlords and businesses in West Dulwich. Fully insured, ARBOMaster approved and guaranteed for a year.
- Glass-to-glass joints that have split
- Sealant that was laid over old silicone and failed
- Water escaping where a screen meets the wall
Glazing silicone in West Dulwich
Glazing silicone is a maintenance item. Sun, rain and movement wear it down and cracked joints let water in. Renewing it keeps glazing joints doing their job. Typical jobs include glazing silicone that has cracked or come away and shower screens leaking along the wall or tray, on glass-to-glass joints, glass-to-frame joints and rooflights.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in West Dulwich.
Whatever the size of the job, you get the same one-year guarantee in West Dulwich and across Greater London.
- Where
- West Dulwich (SE21, SE27, SE19)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in West Dulwich
Every job gets its own quote. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- The type of sealant required
- Any mould that needs treating
The cost depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The rough size of the job
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
Leave it or put it right?
Dealing with a leaking shower screen early protects the floor and ceiling. Water from a failed joint can soak into the floor before you notice. In a flat in West Dulwich, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in West Dulwich
- Arbo and Everbuild products
- White, clear, grey or coloured to suit, where the product allows
- We never seal over old sealant
- 4.9 on Google from 180+ five-star reviews
See how sealant jobs are priced and our reviews.
When to call us in West Dulwich
Glass and frames expand and contract with the temperature, and they don’t move by the same amount. In time, the sealant splits or pulls away.
Look out for any of the following:
- Water tracking down the inner face of the glass
- Failed sealant around rooflight glass
- Glazing silicone that has cracked or come away
- New silicone smeared over old sealant
If you live in an older home near Church of St Stephen, the joint between an old wall and a newer frame is generally the first place rain gets in.
What to look for in a quote
- Are they insured?
- Who turns up on the day
- What guarantee comes with the work
- What product goes in the joint
Windows and doors in West Dulwich
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Sydenham Hill station change hands often, and glazing joints are worth checking at the end of a tenancy, before a small leak grows. For site and facilities teams at buildings such as Dulwich Wood Primary School, the mastic around its windows and doors needs looking after like any other building’s.
West Dulwich is about 1 mile north-east of West Norwood, in Greater London. If you need glazing silicone in West Dulwich, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base. West Dulwich is one of 764 places in Greater London we cover.
Every address in SE21, SE27 and SE19 is covered for glazing silicone, from the main roads to the quietest streets. We cover properties on Berry Lane, Clive Road and Myton Road and the roads around them. West Dulwich sits on or near the A2199, so getting to you is simple. Other places close to West Dulwich include 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). We also work in nearby towns such as 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).
Local landmarks in West Dulwich
Locally, jobs take us to homes and businesses close to The Wood House, Dulwich Prep & Senior and Kingsdale Foundation School. There’s a railway station in West Dulwich itself: Sydenham Hill station. A little further out are British Vintage Wireless And Television Museum (less than half a mile west) and St Christopher's Hospice (1.3 miles south-east). Not far away are Battersea Park Lake and Dulwich Upper Wood.
How the visit works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours for most jobs, depending on how much there is to do. In West Dulwich, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We find where water is getting in and check whether it’s a sealant joint.
- The old sealant is removed from the glass and frame without scratching them.
- We clean the joint with a solvent that suits the glass and frame.
- New glazing silicone goes in and is tooled to a neat finish.
- We look over every joint and, where we can, test it with water.
Preparing for the visit
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we are working on
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
Different surfaces, different methods
Rooflights
We reseal the glazing joints on rooflights. Leaks from the roof itself need a roofer.
Shower screens
Silicone holds the water in on frameless screens. We reseal without scratching the glass.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
West Dulwich: your questions answered
Do you work for landlords with property near Sydenham Hill station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Is parking an issue for glazing silicone in West Dulwich?
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.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Do you fit new glass or sealed units?
Glass replacement is not our trade. We look after the sealant joints and can tell you if a unit seems to have gone.
Can you match the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.