East Sussex · England
External & façade joints in Newhaven, East Sussex
Problem with your movement joints in Newhaven? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Failed seals between different materials
Landlord and commercial work in Newhaven
For anyone letting property in or around Newhaven, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
External mastic in Newhaven
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have old sealant gone brittle and cracked and weeds or debris growing in open joints, we can help, on joints between brick and frames, brickwork movement joints and façade panels alike.
Extensions are a common sight on houses around Newhaven, and the line where an extension meets the original house is a common leak point. Getting the joint depth right matters as much as the sealant itself.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Newhaven (BN9)
- Wider area
- East Sussex
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Do you need external mastic in Newhaven?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
People normally contact us after spotting something like this:
- Joints pointed up with cement by mistake
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
If you live in an older home near Church of St Michael and All Angels, an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- What happens if they find a problem under the old sealant
- What guarantee comes with the work
- Whether you can choose the colour
- Is VAT in the price?
Different surfaces, different methods
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
Also near Newhaven
Other services in Newhaven
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access for a typical job. A visit in Newhaven needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
Getting a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
Read more
Leave it or put it right?
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Newhaven they spread with every shower and every downpour. Now is the easy time to put it right.
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What you get with us
- You choose the colour before work begins
- Every job guaranteed for a year
- Arbo and Everbuild products
- We are fully insured
See what affects the cost and customer reviews.
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What affects the cost of external mastic
We don’t publish a price list. What we look at:
- The product the joint needs
- Whether there’s mould to deal with
- The number and length of the joints
- Whether the work is at height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- The type of property
- How we’d reach the joints
- What’s wrong with the joints now
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or send us an email and describe the job and send photos if you have them.
Common questions in Newhaven
Do you work for landlords with property near Newhaven Town station?
Yes. We work for landlords and agents as well as homeowners. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Does the coastal weather in Newhaven affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Do you have insurance?
Yes. We’re fully insured.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
What does external mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
Outside joints around Newhaven
Newhaven is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
If you look after a building such as UTC@Harbourside, its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Newhaven Town station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Newhaven is about 8 miles east of Brighton, in East Sussex. We provide external mastic to homeowners, landlords and businesses in Newhaven and the surrounding area, as part of our work across East Sussex. Newhaven is one of 289 places in East Sussex where we work. We also work in Brighton, around 8 miles away.
All of BN9 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include High Street, Station Road and Dacre Road. With the A26 and A259 close by, Newhaven is simple for us to get to. Other places close to Newhaven include Denton (1 mile north-east), South Heighton (1 mile north), Piddinghoe (1 mile north-west), Tide Mills (1 mile south-east) and Norton (2 miles east). Within a short drive, we also cover Eastbourne (10 miles east), Seaford (3 miles south-east), Lewes (6 miles north), Hailsham (10 miles north-east), Uckfield (12 miles north) and Telscombe (3 miles west). As one of the bigger places in East Sussex, Newhaven has homes, rented property and businesses of every kind.
Landmarks near Newhaven
Typical jobs here are in homes near Harbour Primary and Nursery School, The Ship Hotel and Castle Hill and the streets around them. There’s a railway station in Newhaven itself: Newhaven Town station. Well-known places in the area include Chailey Heritage Marine Hospital (1.2 miles south-east) and Newhaven Museum (0.5 miles north-east). For a walk, there’s Itford Hill.