East Sussex · England
South Heighton Window Mastic
Window mastic across South Heighton and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Mastic that has split away from the wall
- Cracked internal joints between frame and plaster
- Sealant in the wrong colour for the frame
Window mastic in South Heighton, done properly
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on aluminium frames, uPVC windows and composite doors, and the jobs we see most are gaps between the frame and the inside reveal and hard, cracked sealant around windows.
Mastic can only go onto a dry, clean joint, so window work in South Heighton is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- South Heighton (BN9)
- Wider area
- East Sussex
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What the job involves on each surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. We prepare and reseal every joint, backing the deep ones.
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Broken hinges, locks or handles
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A door that needs adjusting, rehanging or new seals
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Patio & French doors
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- uPVC windows
More services for South Heighton
Windows and doors in South Heighton
South Heighton is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. Historic houses like Monk's House (about 2.9 miles north-west) are a reminder that the area around South Heighton has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near Church of St Leonard, the joint between an old wall and a newer frame is normally the first place rain gets in. For site and facilities teams at buildings such as Denton Community Primary School and Nursery, its window and door frames need their mastic kept sound, just like a home’s.
South Heighton is about 1 mile north of Newhaven, in East Sussex. Jobs in South Heighton get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 289 places in East Sussex are on our list, large and small. We also work in Brighton, about 8 miles from South Heighton.
We work across the BN9 postcode area for window mastic. Neighbouring places we cover for window mastic include Denton (1 mile south), Piddinghoe (1 mile west), Rodmell (3 miles north-west), Telscombe (3 miles west) and Firle (3 miles north). We also work in nearby towns such as Eastbourne (10 miles east), Seaford (3 miles south-east), Lewes (5 miles north-west), Hailsham (10 miles north-east), Uckfield (11 miles north) and Polegate (8 miles east).
Near you in South Heighton
Typical jobs here are in homes near Castle Hill, Hampden Arms and UTC@Harbourside and the streets around them. The nearest railway station is Newhaven Town station, about 0.8 miles south of the centre. Other landmarks nearby include Planet Earth Museum (under half a mile south-west) and Arlington Castle (4.8 miles east). Open spaces near South Heighton include Itford Hill and Southerham Farm.
Common problems we fix in South Heighton
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, while a joint packed solid cannot stretch. That’s what backing rod is for.
Signs it’s time to call us include:
- Cold air getting in at the frame edge
- White mastic on grey or black frames
- Damp patches on the reveal after heavy rain
- Old mastic that has gone black or come away
For landlords with property near Newhaven Town station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What your quote should include
- Whether they seal over old material or remove it
- The length of the guarantee
- Who turns up on the day
- What the cure time is
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
For anyone letting property in or around South Heighton, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Paint up to the joint, not over it
- Do not use solvent cleaners on the joint
- Check the mastic once a year
- Use gentle cleaners on frames and sealant
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
South Heighton: your questions answered
Does living near the coast affect window mastic in South Heighton?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Can you help a landlord with a rental near Newhaven Town station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch and we will plan for it.
What does window mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
How the visit works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a morning for a couple of windows and a door, depending on how much there is to do. In a small place like South Heighton, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
How to prepare
- Tell us if parking is tricky
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
Getting a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.