West Sussex · England
Window & door mastic in Jacob's Post, West Sussex
We cover Jacob's Post for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Cracked or shrunken mastic around the frame
- Leaking joints at the ends of sills
- White mastic on grey or black frames
About our window mastic in Jacob's Post
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that can’t move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have whistling draughts around closed windows and mastic that’s falling out in pieces, we can put it right, whatever the surface.
In a village or hamlet like Jacob's Post, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Your job is guaranteed for a year, as with all our work.
- Where
- Jacob's Post (RH15)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need window mastic in Jacob's Post
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant cannot stretch, it splits.
Look out for these signs:
- Draughty joints inside around the window
- Leaking joints at the ends of sills
- Water coming in at the bottom corners of a door
- Black, perished sealant on frames
If you look after a building such as The Gattons Infant School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- When the joint can take water or movement
- What product goes in the joint
Leave it or put it right?
Resealing frames is a short job: it takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. In a small place like Jacob's Post, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What you get with us
- Tidy, careful work
- More than 20 years in sealant work
- White, clear, grey or another colour, product permitting
- Old sealant always removed completely
Take a look at our cost guide or what customers say.
How it works
At the end, we look at the finished work together. The work normally takes a few hours for a few frames, or a day or more for a whole house, depending on the amount of work. For a village or hamlet like Jacob's Post, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we’re working on
How to get a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Advice
What sealant work cannot fix
It helps to know what we cannot do:
- Penetrating damp from a failed cavity tray or render
- Soft or decayed wood in the frame
- Faulty window hardware
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before you book.
Where we work in Jacob's Post
- Timber windows & doors
- Composite doors
- Patio & French doors
- Window sills
- Aluminium frames
- uPVC windows
Places near Jacob's Post
Other services in Jacob's Post
Common questions in Jacob's Post
Can you help a landlord with a rental near Burgess Hill station?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Jacob's Post?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you guarantee window mastic?
Yes. Every job comes with our one-year guarantee, and we’re ARBOMaster approved applicators.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
How long does it take to reseal the windows on a house?
Allow a few hours for a few frames, or a day or more for a whole house. Access and the amount of old mastic make the biggest difference.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
Aftercare tips
After the cure time, these simple habits help:
- Avoid harsh chemicals near the mastic
- Make sure the drainage slots aren’t blocked
- Check the mastic once a year
- Avoid blasting the frames with a pressure washer
Silicone can’t normally be painted, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
Landlords, agents and businesses in Jacob's Post
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
What window mastic looks like in Jacob's Post
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Ockenden Manor (about 3.2 miles north) nearby, there’s older building stock in the area around Jacob's Post as well as newer homes. 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.
If you live in an older home near Providence Strict Baptist Chapel, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Burgess Hill station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Jacob's Post is about 1 mile west of Burgess Hill, in West Sussex. Every kind of property in Jacob's Post can book us for window mastic. The work is guaranteed for a year. 371 places in West Sussex are on our list, from the larger towns to small villages. You can also see our page for Brighton, about 9 miles away.
We work across the RH15 postcode area for window mastic and the streets around it. Whether your property is on Downs Road, London Road and Western Road or anywhere close by, we can help. We also cover the places around Jacob's Post: Burgess Hill (1 mile east), Abbotsford (1 mile north), World's End (1 mile east), Goddards Green (1 mile west) and Hurst Wickham (2 miles south-west). We also work in nearby towns such as Crawley (11 miles north), Horsham (11 miles north-west), Worthing (15 miles south-west), Haywards Heath (3 miles north-east), East Grinstead (13 miles north-east) and Shoreham-by-Sea (10 miles south-west).
Local landmarks in Jacob's Post
Typical jobs here are in homes near The Cricketers pub, St Paul's Catholic College and Oakmeeds Community College, among other places. For rail, the closest station is Burgess Hill station, about 0.7 miles south-east. A little further out are Burgess Hill Museum (0.5 miles south-east) and The Dene Hospital (1.2 miles west). For a walk, there’s Bedelands Farm Nature Reserve and Wolstonbury Hill.
How the job changes by surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we’ll tell you before going ahead, as a joiner will need to deal with it.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain can’t run into the wall.