West Sussex · England
Window & door mastic in Clapham, West Sussex
We cover Clapham for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Old mastic that has gone black or come away
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
Window mastic in Clapham, done properly
Around Clapham 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. If you are dealing with leaking joints at the ends of sills and rain getting in at the frame or under the sill, we can put it right, on uPVC windows, timber windows & doors and window sills alike.
Around Clapham, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Each job carries a 12-month guarantee, large or small.
- Where
- Clapham (BN13)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Around Clapham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why Clapham clients choose us
- Domestic, commercial and hotel work
- Fully insured
- ARBOMaster approved applicator
- Tidy, careful work
Take a look at our cost guide or our reviews.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
If you manage several properties in or around Clapham, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
Signs you need window mastic in Clapham
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
People generally contact us when they notice one of these:
- Cracked sealant at the sill ends
- Rain getting in at the frame or under the sill
- Cracked internal joints between frame and plaster
- A bead that does not match the frame
Letting a property close to Goring-By-Sea station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Before you book anyone
- What preparation is included
- How much experience the applicator has
- Are they insured?
- Which colour the sealant will be
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that’s what we find.
The process
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a morning for a couple of windows and a door, and we tell you how long to leave it before we go. Somewhere as small as Clapham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each frame is looked over and we agree which ones need resealing.
- 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.
Preparing for the visit
- Clear the area around the work
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Getting a quote is simple: tell us what needs doing and where. A few pictures by email make the job easier to understand, and we’ll take it from there.
Advice
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- A sash or casement that will not close properly
- Damp coming through the wall itself rather than the frame joint
- Soft or decayed wood in the frame
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
What we seal
- Window sills
- uPVC windows
- Composite doors
- Patio & French doors
- Aluminium frames
- Timber windows & doors
Frames and glazing around Clapham
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Ecclesden Manor (about 1.5 miles south-west) nearby, there’s older building stock in the area around Clapham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
In the older streets around The Parish Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Clapham and Patching CofE Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Clapham is about 3 miles north-west of Worthing, in West Sussex. If you need window mastic in Clapham, please call 0345 464 0079 or email us for a quick quote. We cover West Sussex from our Crawley base, Clapham included. Clapham is one of 371 towns and villages in West Sussex we cover. There’s also a page for Brighton, roughly 14 miles from Clapham.
Postcode districts we cover here for window mastic: BN13. Local streets include The Street, Long Furlong and Church Close, all of which we cover. With the A280 close by, Clapham is simple for us to get to for window mastic. Other places close to Clapham include Patching (1 mile north-west), Cote (1 mile east), Hammerpot (2 miles west), Durrington (2 miles south-east) and Hangleton (2 miles south). Within a short drive, we also cover Worthing (3 miles south-east), Bognor Regis (11 miles west), Chichester (14 miles west), Littlehampton (4 miles south-west), Shoreham-by-Sea (8 miles east) and Lancing (6 miles east).
Around Clapham
We work in homes and buildings around Clapham Wood, The Fox pub and Chatsmore Catholic High School, among other places. The nearest railway station is Goring-By-Sea station, roughly 2.1 miles south. Nearby you’ll also find Museum of Sussex Folklore (2.9 miles south-east) and Old Castle (2.9 miles south-east). Green spaces nearby include WWT Arundel and Highdown Hill.
Also in Clapham
FAQs for Clapham
Do you work for landlords with property near Goring-By-Sea station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Do you cover Clapham for window mastic?
Yes. We work across London and the South East, and Clapham is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Will new mastic stop draughts?
Often, yes. Air often gets in between the frame and the wall, and resealing inside and out closes it.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. You will know the timing when we quote.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Can you do the inside joint as well?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
Can I paint over the new sealant?
Not normally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Can you do upstairs windows?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Walk round the house once a year and look at the joints
- Avoid harsh chemicals near the mastic
- Make sure the drainage slots aren’t blocked
- Keep timber frames painted
Try not to touch the new joint while it cures, following the cure time we give you. Keep jet washers away from the frames.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.