East Sussex · England
Window Mastic in Crowborough
Window mastic for Crowborough, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking joints at the ends of sills
- White mastic on grey or black frames
- Mastic that has split away from the wall
Window mastic in Crowborough
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you have white mastic on grey or black frames and draughts coming in around windows and doors, we can help, whatever the surface.
Around Crowborough, many houses have gained conservatories, French doors or replacement windows over time. Every addition brings more joints, each wearing at its own pace. Leaks usually start at a sill, a frame head or a glazing joint.
Whatever the size of the job, it’s backed by our 12-month guarantee in Crowborough and across East Sussex.
- Place
- Crowborough (TN6)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need window mastic in Crowborough
Sills take more water than any other part of a window, 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.
Common reasons people contact us include:
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
- A bead that does not match the frame
- Cracked or shrunken mastic around the frame
In the older streets around The Parish Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before booking
- How long the guarantee is
- How the colour is chosen
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How we quote for window mastic
We don’t publish a price list, because jobs vary so much. The quote depends on:
- How much old sealant there is and how hard it is to remove
- The size of the job
- Which sealant suits the joint
- The number of rooms or windows
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- A few photos by email, if you can
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
For window mastic in Crowborough, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
What happens on the day
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes most of a day for a typical house, less for a few frames. In Crowborough, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
How to get a quote
For a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
Towns and villages near Crowborough
What else we do in Crowborough
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Wash the frames with mild soapy water
- Don’t use solvent cleaners on the joint
- Check the mastic once a year
- Do not paint over the silicone
Silicone cannot usually be painted, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.
Your questions about window mastic in Crowborough
What guarantee comes with window mastic in Crowborough?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Can you help a landlord with a rental near Crowborough station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We check where the draught is before work begins.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do you come to Crowborough?
Yes. We’re based in Crawley and work across South East England, London and Scotland.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
What does window mastic cost?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Frames and glazing around Crowborough
Historic houses like Groombridge Place (about 4.6 miles north) are a reminder that the area around Crowborough has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Rented homes near Crowborough station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as St Marys Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Crowborough is about 16 miles south of Sevenoaks, in East Sussex. We carry out window mastic for householders, landlords and businesses in Crowborough and the surrounding area, as part of our work across East Sussex. Across East Sussex, we cover 289 places, Crowborough among them. You can also see our page for Crawley, about 16 miles away.
Jobs for window mastic in TN6 is quoted and booked the same way as anywhere else. That includes homes and businesses on Church Road, High Street and London Road. Being close to the A26 and B2100, Crowborough is simple for us to get to for window mastic. Neighbouring places we cover for window mastic include Jarvis Brook (1 mile east), Steel Cross (1 mile north-east), Boarshead (2 miles north-east), Sweethaws (2 miles south-west) and Marden's Hill (2 miles north-west). We also work in nearby towns such as Lewes (14 miles south-west), Hailsham (14 miles south), Uckfield (6 miles south-west), South Malling (14 miles south-west), Heathfield (7 miles south-east) and Southover (14 miles south-west). As one of the bigger places in East Sussex, Crowborough has homes, rented property and businesses of every kind.
Near you in Crowborough
Around Crowborough, our work takes us to homes and buildings near Beacon Academy and The Crowborough Cross pub, among other places. The nearest railway station is Crowborough station, about 1 mile south-east of the centre. Well-known places in the area include Crowborough War Memorial Hospital (0.5 miles west). For a walk, there’s Crowborough Country Park.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.