West Sussex · England
Window & door mastic in High Cross, West Sussex
Mastic around window and door frames, sills and patio doors in High Cross, with a 12-month guarantee on every job. Call for a quick quote.
- Gaps between the frame and the inside reveal
- Rushed sealant from a window installation
- Mastic that is falling out in pieces
Landlord and commercial work in High Cross
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
If you manage several properties in or around High Cross, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Window mastic in High Cross, done properly
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. If you’re dealing with whistling draughts around closed windows and leaking joints at the ends of sills, we can put it right.
Mastic can only go onto a dry, clean joint, so window work in High Cross is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All our work is covered by our one-year guarantee.
- Where
- High Cross (BN6)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
So the new joints stay in good condition:
- Clean frames with a soft cloth and soapy water
- Paint up to the joint, not over it
- Clear any debris from frame drain holes
- Avoid harsh chemicals near the mastic
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Questions from High Cross
Do you cover High Cross for window mastic?
Yes. Our work covers London and the South East, and High Cross is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to High Cross?
Yes. High Cross is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long before the joint can be used?
Cure times vary by product. We tell you how long to leave it before we go.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access.
Can tenants book the work?
We are happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
What does window mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
What affects the quote in High Cross
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- The size of the job
- How easy the joints are to reach
- The product the joint needs
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
What we need to know
Photos help, but a description is a good start. Please mention:
- If someone has resealed it before
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- How many joints, rooms or windows are involved
Getting a quote is simple: tell us what needs doing and where. A few photos by email make the job easier to understand.
Leave it or put it right?
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a small place like High Cross, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and give you a clear price before work begins.
What you get with us
- Old sealant always removed completely
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
- Every job guaranteed for a year
Read what affects the cost and customer reviews.
Frames and glazing around High Cross
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.
For site and facilities teams at buildings such as Albourne CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near The Parish Church of St Bartholomew, the joint between an old wall and a newer frame is usually the first place rain gets in. Letting a property close to Hassocks station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
High Cross is about 4 miles west of Burgess Hill, in West Sussex. Our applicators cover window mastic for homes and businesses in High Cross and nearby, as part of our work across West Sussex. High Cross is one of 371 towns and villages in West Sussex where we work. You can also see our page for Brighton, roughly 9 miles from High Cross.
Every address in BN6 is within our area for window mastic. Other places close to High Cross include Albourne (1 mile south-east), Albourne Green (1 mile south-east), Albourne Street (1 mile south-east), Blackstone (1 mile south-west) and Twineham (2 miles north). Further out, we also cover Crawley (12 miles north), Horsham (10 miles north-west), Worthing (11 miles south-west), Haywards Heath (7 miles north-east), Burgess Hill (4 miles east) and Shoreham-by-Sea (8 miles south).
Landmarks near High Cross
High Cross’s nearest station is Hassocks station, roughly 3.4 miles east of the centre. A little further out are The Dene Hospital (2.9 miles north-east) and Clayton Castle (3.9 miles south-east). Not far away are Wolstonbury Hill and Woods Mill.
What happens on the day
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. It normally takes most of a day for a typical house, less for a few frames. For a village or hamlet like High Cross, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Clear the area around the work
- Tell us about any water getting in
- Let us know about parking restrictions
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and send you a clear quote.
Related advice
Surface 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.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so they get particular care.
When something else is needed
In fairness, some problems need a different trade:
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Timber windows & doors
- Aluminium frames
- Composite doors
- Patio & French doors
- Window sills
- uPVC windows