Greater London · England
Window & door mastic in Clapton, Greater London
Window mastic across Clapton and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
- Water coming in at the bottom corners of a door
The process
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before work begins. The work usually takes anything from an hour or two to a full day, depending on how many frames there are. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Clapton. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
Get a quote
Every job is quoted individually. Simply call 0345 464 0079 or email us and describe the job.
Related advice
Window mastic in Clapton, done properly
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you are dealing with a bead that doesn’t match the frame and black, perished sealant on frames, we can help, on patio & French doors, timber windows & doors and uPVC windows alike.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
Whatever the size of the job, you get the same one-year guarantee in Clapton and across Greater London.
- Location
- Clapton (E5, N16, E8)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so they get particular care.
Should I try it myself first?
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.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Window mastic in Clapton: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St James the Great, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. As a London address, Clapton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Schools such as BSix Sixth Form College are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Clapton is about 2 miles east of Highbury, in Greater London. Every kind of property in Clapton is covered for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, and Clapton is one of them.
All of E5, N16 and E8 is within our area for window mastic. Whether your property is on Muir Road, Downs Road and Tilia Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for window mastic include Lea Bridge (1 mile north-east), West Hackney (1 mile west), Homerton (1 mile south-east), Lower Clapton (1 mile south-east) and Shacklewell (1 mile south-west). We also work in nearby towns such as London (4 miles south), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles south-west) and Whitechapel (3 miles south).
Near you in Clapton
In Clapton, that means homes and buildings near The Amhurst Arms Public House, Baden-Powell School and Millfields Park, among other places. Clapton has its own railway station: Clapton station. Well-known places in the area include Clowns Gallery-Museum (1.2 miles south-west) and Tower of London (3.6 miles south). For a walk, there’s Dartmouth Park Hill and Hollow Pond.
What we cannot put right
We’d rather tell you now than do work that won’t last, so these are the limits:
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
- Condensation trapped between the panes
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Where we work in Clapton
- Patio & French doors
- Window sills
- Composite doors
- Aluminium frames
- uPVC windows
- Timber windows & doors
Leave it or put it right?
Failed mastic is not a reason to replace sound windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Clapton, the repair is bigger than a sealant job.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- A choice of colours where the product allows
- 180+ five-star Google reviews
- More than 20 years in sealant work
Read what affects the cost or our reviews.
Other services in Clapton
Landlord and commercial work in Clapton
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
If you manage several properties in or around Clapton, several properties can be quoted together. Just tell us the addresses and what each one needs.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Walk round the house once a year and look at the joints
- Do not paint over the silicone
- Wipe condensation off the frames
- Keep solvents and bleach off the sealant
Silicone cannot usually be painted, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
Common questions in Clapton
Can parking be tricky for a visit in Clapton?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is Clapton in your area for window mastic?
Yes, Clapton is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Can landlords and businesses book you?
Yes. We work for householders, landlords, letting agents, businesses and hotels.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Will new mastic stop draughts?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Where do you work from?
Mr Mastic is based in Crawley. We cover Clapton and the rest of Greater London, along with the rest of our area.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you when we finish.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.