West Sussex · England
Heyshott Green Window Mastic
We cover Heyshott Green for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Hard, cracked sealant around windows
- Rushed sealant from a window installation
- A bead that does not match the frame
Window mastic in Heyshott Green
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. Common call-outs are for cracked or shrunken mastic around the frame and untidy mastic left by window fitters, across timber windows & doors, patio & French doors and window sills.
Homes in small places like Heyshott Green often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, it’s backed by our 12-month guarantee in Heyshott Green and across West Sussex.
- Where
- Heyshott Green (GU29)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
For anyone letting property in or around Heyshott Green, several properties can go on one quote. Just tell us the addresses and what each one needs.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from an hour or two to a full day, depending on how many frames there are and we leave things clean and tidy. Somewhere like Heyshott Green needs a little journey planning: 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.
- 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.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
- Mention any tricky access
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
Aftercare tips
A little care helps the new joints last. Our advice:
- Use gentle cleaners on frames and sealant
- Check the mastic once a year
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
Most silicone sealants will not take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Nearby places to Heyshott Green
What else we do in Heyshott Green
Honest limits
New sealant cannot fix everything, and we’d rather say so up front. Sealant won’t put right:
- A sash or casement that will not close properly
- Soft or decayed wood in the frame
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Patio & French doors
- Window sills
- Timber windows & doors
- Composite doors
- Aluminium frames
- uPVC windows
Frames and glazing around Heyshott Green
With historic houses such as Cowdray House (about 1.9 miles north) nearby, there’s older building stock in the area around Heyshott Green as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as The Parish Church of St James, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Midhurst Rother College, the mastic around its windows and doors needs looking after like any other building’s.
Heyshott Green is about 9 miles north of Chichester, in West Sussex. If you need window mastic in Heyshott Green, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover West Sussex, Heyshott Green included. Heyshott Green is one of 371 places in West Sussex we cover. Our Portsmouth page covers work nearby.
We cover every part of the GU29 postcode area for window mastic. Close by, we work in Heyshott (1 mile south-east), Hoyle (1 mile east), Cocking Causeway (1 mile north-west), Cocking (1 mile south-west) and West Lavington (1 mile north). Larger places within reach include Bognor Regis (12 miles south), Chichester (9 miles south), Littlehampton (13 miles south-east), Emsworth (12 miles south-west), Rustington (14 miles south-east) and Storrington (12 miles east).
What’s near Heyshott Green
We work in homes and buildings around Unicorn Inn, among other places. A little further out are Midhurst Community Hospital (2.3 miles north) and Midhurst Museum (1.9 miles north). Green spaces nearby include Graffham Common and Levin Down.
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
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.
What the job involves on each surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We’ll tell you which suits your home.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Heyshott Green questions
Is window mastic in Heyshott Green guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Is Heyshott Green within the area you cover?
Yes, Heyshott Green is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
How many windows can you do in a day?
The work takes most of a day for a typical house, less for a few frames. Access and how stubborn the old mastic is affect the time most.
How much does window mastic cost in Heyshott Green?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or drop us an email and let us know what needs doing and where.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints.
Are you insured?
Yes. We’re fully insured.
Can new window sealant be painted?
Not generally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
What happens if it’s left?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Older cottages and farmhouses around Heyshott Green can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or email us and we will give you an honest view and a quote.
Why choose Mr Mastic in Heyshott Green
- A choice of colours where the product allows
- Fully insured
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
Take a look at how sealant jobs are priced and our reviews.