West Sussex · England
External & façade joints in Southwick, West Sussex
External mastic across Southwick and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Joints pointed up with cement by mistake
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
About our external mastic in Southwick
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We strip the joint back and start again. If you have failed sealant between panels on a façade and weathered mastic that no longer stretches, we can help, whatever the surface.
Houses in smaller places like Southwick can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. That’s where gutter joints and wall joints tend to fail first.
Your job is guaranteed for a year, as with all our work.
- Location
- Southwick (BN42, BN41, BN43)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Southwick: your questions answered
Do you cover smaller places like Southwick?
Yes. Southwick is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Southwick station?
Yes. We work for landlords and letting agents as well as homeowners. You can call 0345 464 0079 or send us an email with the details for a clear quote.
How do you reach high-level joints?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Do you guarantee your work?
Yes, for a year. If there’s a problem with our work in that time, tell us and we’ll put it right.
Different surfaces, different methods
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Walls and rooflines in Southwick
Southwick is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Eastbrook Primary Academy? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around St Michael and All Angels Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Southwick station, outside joints that have cracked can let damp into a rental, so check them between lets.
Southwick is about 2 miles east of Shoreham-by-Sea, in West Sussex. Jobs in Southwick get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Southwick is one of 371 places in West Sussex we cover for external mastic.
Jobs for external mastic in BN42, BN41 and BN43 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Station Road, Roman Crescent and Southwick Street or anywhere close by, our applicators can take on the job. Being close to the A259 and A270, Southwick is simple for us to get to for external mastic. We also cover the places around Southwick: Kingston by Sea (1 mile north-west), Portslade (1 mile north-east), Shoreham-by-Sea (2 miles west), Hangleton (2 miles north-east) and Old Shoreham (2 miles west). Larger places within reach include Worthing (7 miles west), Haywards Heath (13 miles north-east), Burgess Hill (10 miles north-east), Littlehampton (13 miles west), Lancing (4 miles west) and Rustington (12 miles west).
Near you in Southwick
Typical jobs here are in homes near Shoreham Academy, Benfield Hill and The Ship Inn. There’s a railway station in Southwick itself: Southwick station. Well-known places in the area include Southlands Hospital (1 mile west) and Churchill Square (4 miles east). The countryside around Southwick includes Shoreham Beach and Thundersbarrow Hill.
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours to a few days, depending on the length of joint and the access. In a smaller place like Southwick, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Related advice
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Keep high-pressure jets off the joints
- Never let anyone fill a movement joint with mortar
- Clear growth from the base of walls and joints
- Check external joints each spring
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Towns and villages near Southwick
Also in Southwick
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Around Southwick, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- Rated 4.9 stars on Google
- Trusted Arbo and Everbuild sealants
- 12-month guarantee on every job
- Colour agreed with you before we start
See what affects the cost and customer reviews.
What affects the quote in Southwick
The quote reflects the job in front of us. We look at:
- The number and length of the joints
- The old material and how stubborn it is
- The number of rooms or windows
- The type of sealant required
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Helping us quote
There’s no need for technical detail. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
- Where the job is, and your postcode
For external mastic in Southwick, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.