West Sussex · England
Castle Town Window Mastic
Problem with your window and door frames in Castle Town? We cut out the old, prepare the joints and apply the right sealant.
- Damp patches on the reveal after heavy rain
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
Different surfaces, different methods
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it 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 seal the frame and let you know about anything else.
Window mastic for homes and businesses in Castle Town
Most frames have an outside joint and an inside one. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. Common call-outs are for draughts coming in around windows and doors and white mastic on grey or black frames, on uPVC windows, composite doors and window sills.
Around Castle Town, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or email us.
- Place
- Castle Town (BN44)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take most of a day for a typical house, less for a few frames. In a small place like Castle Town, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
Get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or email us.
Read more
Why it’s worth doing now in Castle Town
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. Where a wall is exposed, as many are in small places like Castle Town, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why choose Mr Mastic in Castle Town
- White, clear, grey or coloured to suit, where the product allows
- Experience in homes, commercial sites and hotels
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
See our cost guide or our reviews.
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Access and height
- When we can work, for business premises
- Whether there’s mould to deal with
- How much there is to do
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
What we need to know
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- If someone has resealed it before
- Photos by email, if that’s easy
- What’s wrong with the joints now
If you’re in Castle Town and need window mastic, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
What we cannot put right
We will always be straight with you, so here’s what new sealant won’t do:
- Draughts through the window seals rather than the frame
- Broken hinges, locks or handles
- Misting between the panes of a double-glazed unit (that needs a new unit)
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- uPVC windows
- Timber windows & doors
Also near Castle Town
Other services in Castle Town
Your questions about window mastic in Castle Town
Do you cover Castle Town for window mastic?
Yes, Castle Town is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
I let a flat near Shoreham-By-Sea station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
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.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you do upstairs windows?
Yes, where it’s safe. For high or awkward windows, we’ll tell you what access is needed.
Can new window sealant be painted?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Frames and glazing around Castle Town
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Portslade Manor (about 4.2 miles south-east) nearby, there’s older building stock in the area around Castle Town 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.
If you look after a building such as Upper Beeding Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Shoreham-By-Sea station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Castle Town is about 3 miles north of Shoreham-by-Sea, in West Sussex. Wherever you are in the BN44 postcode area, our applicators can take on window mastic. Across West Sussex, we cover 371 places, Castle Town among them. There’s also a page for Brighton, about 8 miles away.
Here we cover the BN44 postcode area for window mastic. Streets in the area include Henfield Road, The Bostal and Shoreham Road. If you’re just outside Castle Town, we cover Adur (2 miles south), Old Shoreham (3 miles south), Shoreham-by-Sea (3 miles south), Fulking (3 miles east) and Kingston by Sea (4 miles south-east). Within a short drive, we also cover Horsham (13 miles north), Worthing (6 miles south-west), Haywards Heath (12 miles north-east), Burgess Hill (9 miles north-east), Littlehampton (11 miles south-west) and Lancing (4 miles south).
Landmarks near Castle Town
In Castle Town, that means homes and buildings near Steyning Grammar School and Hillside Park (parke sa Hiniusang Gingharian) and the streets around them. Castle Town’s nearest station is Shoreham-By-Sea station, roughly 3.2 miles south. Other landmarks nearby include Southlands Hospital (3.1 miles south-east) and Steyning Museum (1.5 miles north-west). For a walk, there’s Mill Hill and Truleigh Hill.
Do you need window mastic in Castle Town?
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
Any of these means the joints need attention:
- Draughty joints inside around the window
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
Homes close to St Botolph's Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- What happens if the job turns out different
- How the colour is chosen
- How the surfaces are prepared before sealing
- Is VAT in the price?
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Do not use solvent cleaners on the joint
- Clean frames with a soft cloth and soapy water
- Keep jet washers away from the mastic
- Walk round the house once a year and look at the joints
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.