Greater London · England
Window & door mastic in Clapham Junction, Greater London
Window and door frames in Clapham Junction need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Water coming in at the bottom corners of a door
- Draughty joints inside around the window
- Untidy mastic left by window fitters
About our window mastic in Clapham Junction
Around Clapham Junction we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on patio & French doors, window sills and uPVC windows, and people most often call us about mastic that’s falling out in pieces and gaps left after new windows were fitted.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Clapham Junction.
We stand behind the work with a 12-month guarantee, so you are covered after we’ve gone.
- Where
- Clapham Junction (SW11, SW18, SW4)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Clapham Junction
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant cannot stretch, it splits.
Common reasons people contact us are:
- Cracked or shrunken mastic around the frame
- Draughty joints inside around the window
- A bead that does not match the frame
- Mastic that is falling out in pieces
Managing a site like Christ Church CofE Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- Whether you can choose the colour
- Is VAT in the price?
- The length of the guarantee
- How hidden problems are handled
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- A sash or casement that will not close properly
- Damp problems in the wall away from the window
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or email us and we will say what we think.
What we seal
- Aluminium frames
- uPVC windows
- Patio & French doors
- Composite doors
- Window sills
- Timber windows & doors
Towns and villages near Clapham Junction
More services for Clapham Junction
Work for landlords, hotels and businesses
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.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Common questions in Clapham Junction
Do you work for landlords with property near Clapham Junction station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can parking be tricky for a visit in Clapham Junction?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Is the work guaranteed?
Yes. Every job comes with our 12-month guarantee, and we are fully insured.
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.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Frames and glazing around Clapham Junction
Historic houses like Carlyle's House (about 1.4 miles north) are a reminder that the area around Clapham Junction 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’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Clapham Welsh Presbyterian Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Clapham Junction station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Clapham Junction is about 3 miles south-east of Kensington, in Greater London. For window mastic in and around Clapham Junction, please phone 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base. Clapham Junction is one of 764 towns and villages in Greater London we cover for window mastic.
Work in SW11, SW18 and SW4 works the same way as everywhere else we cover. Whether your property is on York Road, Este Road and Home Road or anywhere close by, we can help. Main roads around Clapham Junction include the A3207. Neighbouring places we cover for window mastic include Battersea (1 mile south-east), Sands End (1 mile north-west), Chelsea Harbour (1 mile north-west), Wandsworth (1 mile south-west) and Clapham (1 mile east). Larger places within reach include London (4 miles north-east), City of Westminster (4 miles north), Marylebone (4 miles north), Kensington (3 miles north-west), St Pancras (5 miles north-east) and Shoreditch (6 miles north-east).
Local landmarks in Clapham Junction
We work in homes and buildings around Imperial Park, The Falcon pub and Thames Christian College, among other places. Clapham Junction has its own railway station: Clapham Junction station. A little further out are Baynard's Castle (4.4 miles north-east) and Battersea General Hospital (0.8 miles north). The countryside around Clapham Junction includes Battersea Park Lake and Wandle Meadow Nature Park.
Why it’s worth doing now in Clapham Junction
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Clapham Junction, the repair is bigger than a sealant job.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
What you get with us
- More than 20 years in sealant work
- Quality sealants from Arbo and Everbuild
- ARBOMaster approved applicator
- Colour picked to suit the job
See our cost guide or what customers say.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes most of a day for a typical house, less for a few frames from start to finish. In a London area like Clapham Junction, 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 start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
How to prepare
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before work begins.
Advice
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Looking after it afterwards
To keep the joints looking good and working properly:
- Check the mastic once a year
- Use gentle cleaners on frames and sealant
- Clear any debris from frame drain holes
- Keep timber frames painted
A yearly look round the frames is enough. Small splits are simple to catch before they leak.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.