Greater London · England
Window Mastic in Isle of Dogs
We cover Isle of Dogs for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Rushed sealant from a window installation
- Draughty joints inside around the window
- Damp patches on the reveal after heavy rain
What affects the quote in Isle of Dogs
Your quote is based on your job. We take into account:
- Mould in or behind the old joints
- The product the joint needs
- Whether old sealant or filler has to be cut out
- The amount of work
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The address or postcode of the job
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
If you are in Isle of Dogs and need window mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Window mastic for homes and businesses in Isle of Dogs
Around Isle of Dogs we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on composite doors, uPVC windows and aluminium frames, and the jobs we see most are mastic that’s falling out in pieces and cold air getting in at the frame edge.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
You’re covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or drop us an email.
- Location
- Isle of Dogs (E14, SE8, SE10)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
A careful DIYer can reseal a simple joint, 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.
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Do not aim a pressure washer at the joints
- Keep paint off silicone joints
- Keep solvents and bleach off the sealant
- Wash the frames with mild soapy water
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
When to call us in Isle of Dogs
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
Most people get in touch when they notice one of these:
- Old mastic that has gone black or come away
- Rushed sealant from a window installation
- White mastic on grey or black frames
- Draughty joints inside around the window
For site and facilities teams at buildings such as Harbinger Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Before booking anyone
- Whether all the old sealant comes out first
- The length of the guarantee
- What product goes in the joint
- How the joint is cleaned and prepared
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Isle of Dogs, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- A choice of colours where the product allows
- Neat joints and a tidy finish
- Quality sealants from Arbo and Everbuild
- One-year guarantee on every job
See our cost guide or our reviews.
Questions from Isle of Dogs
Can you help a landlord with a rental near Greenwich station?
Yes. We work for letting agents and landlords as well as homeowners. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can parking be tricky for a visit in Isle of Dogs?
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.
How many windows can you do in a day?
A handful of frames is a short visit. We confirm the timing with your quote.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will tell you what we’re using.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Do you guarantee window mastic?
Yes. Every job comes with our 12-month guarantee, and we’re ARBOMaster approved applicators.
Places near Isle of Dogs
Other services in Isle of Dogs
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Draughts through the window seals rather than the frame
- Rotten timber, which needs a joiner first
- Damp problems in the wall away from the window
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Aluminium frames
- Composite doors
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Window sills
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. For a job in Isle of Dogs, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or send us an email.
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Windows and doors in Isle of Dogs
Historic houses like Queen's House (about 0.8 miles south-east) are a reminder that the area around Isle of Dogs has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Nicholas, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Isle of Dogs can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Isle of Dogs is about 1 mile north-west of Greenwich, in Greater London. Whether you’re in the middle of Isle of Dogs or further out, we cover window mastic for every kind of property. Isle of Dogs is one of 764 towns and villages in Greater London we cover.
Work in E14, SE8 and SE10 is quoted and booked the same way as anywhere else. Local streets include Creek Road, Wynan Road and Undine Road. Close by, we work in North Greenwich (1 mile north-west), Millwall (1 mile west), Cubitt Town (1 mile north-east), Deptford (1 mile south-west) and Greenwich (1 mile south-east). Larger places within reach include London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
Around Isle of Dogs
Around Isle of Dogs, our work takes us to homes and buildings near The Ferry House Public House, Laban Centre and St. Paul's. You’ll also find Mudchute Park and Farm (less than half a mile north-east) and Canary Wharf College 3 (within half a mile north). The closest station to Isle of Dogs is Greenwich station, about 0.7 miles south. Well-known places in the area include Greenwich Castle (1 mile south-east) and Surrey Quays Shopping Centre (1.3 miles west). Green spaces nearby include Tower Hill and Sue Godfrey Nature Park.