West Sussex · England
Window Mastic in Heyshott
Window mastic across Heyshott and nearby, with old sealant always removed completely.
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
- Old mastic that has gone black or come away
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Use gentle cleaners on frames and sealant
- Don’t use solvent cleaners on the joint
- Keep paint off silicone joints
- Avoid blasting the frames with a pressure washer
Try not to touch the new joint while it cures, following the cure time we give you. Keep jet washers away from the frames.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
Window mastic for homes and businesses in Heyshott
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. The sealant then grips the two sides it should. We work on patio & French doors, uPVC windows and composite doors, and the jobs we see most are mastic that’s falling out in pieces and cracked internal joints between frame and plaster.
Mastic can only go onto a dry, clean joint, so window work in Heyshott is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a 12-month guarantee.
- Place
- Heyshott (GU29)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Heyshott homes and the weather
With historic houses such as Cowdray House (about 2.5 miles north) nearby, there’s older building stock in the area around Heyshott 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. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Heyshott, as everywhere, window mastic is only as good as the preparation behind it.
Heyshott is about 8 miles north of Chichester, in West Sussex. For window mastic in and around Heyshott, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover West Sussex, Heyshott included. Our area takes in 371 places across West Sussex, from the larger towns to small villages. We also work in Portsmouth, about 19 miles from Heyshott.
We work across the GU29 postcode area for window mastic. We also cover the places around Heyshott: Hoyle (1 mile north-east), Heyshott Green (1 mile north-west), Cocking (1 mile west), Cocking Causeway (2 miles north-west) and West Lavington (2 miles north). Within a short drive, we also cover Bognor Regis (11 miles south), Chichester (8 miles south), Selsey (15 miles south), Littlehampton (13 miles south-east), Emsworth (12 miles south-west) and Rustington (13 miles south-east).
Local landmarks in Heyshott
Locally, jobs take us to homes and businesses close to Unicorn Inn and the streets around them. Other landmarks nearby include Lodsworth Castle (2.8 miles north-east) and Midhurst Community Hospital (2.9 miles north). Not far away are Graffham Common and Levin Down.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Nearby places to Heyshott
Also in Heyshott
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take most of a day for a typical house, less for a few frames. Somewhere as small as Heyshott, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- 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.
How to prepare
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details, and photos are welcome.
Read more
When something else is needed
A few problems are outside what sealant work can do:
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
- Soft or decayed wood in the frame
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Heyshott
- Patio & French doors
- Composite doors
- uPVC windows
- Aluminium frames
- Window sills
- Timber windows & doors
Leave it or put it right?
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. Where a wall is exposed, as many are in small places like Heyshott, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
Why us?
- Approved under the ARBOMaster scheme
- You choose the colour before work begins
- 20+ years of sealant experience
- 4.9 on Google from 180+ five-star reviews
Take a look at our cost guide and what customers say.
Your questions about window mastic in Heyshott
Is Heyshott within the area you cover?
Yes, Heyshott is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you cover Heyshott for window mastic?
Yes. We work across London and the South East, and Heyshott is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Does the work come with a guarantee?
Yes. Every job comes with our one-year guarantee, and we are ARBOMaster approved applicators.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We check where the draught is before we start.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few pictures.
How long will my window job take?
The work takes a few hours for a handful of frames, longer for a whole house. Access and how stubborn the old mastic is affect the time most.
Common problems we fix in Heyshott
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Keep an eye out for these signs:
- Water coming in at the bottom corners of a door
- Rushed sealant from a window installation
- Whistling draughts around closed windows
- Mastic that’s falling out in pieces
For an older house near a landmark such as The Parish Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- How long the guarantee is
- Whether the sealant suits the joint
- Who turns up on the day
- Is VAT in the price?
Surface by surface
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.