West Sussex · England
External Mastic in Hunston
External mastic across Hunston and nearby, with old sealant always removed completely and a 12-month guarantee.
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Movement joints with cracked, split or missing sealant
How we handle external mastic in Hunston
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. If you are dealing with rigid filler in a joint that should flex and weathered mastic that no longer stretches, we can put it right, on render & cladding joints, concrete & block and façade panels alike.
In a village or hamlet like Hunston, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Hunston (PO20)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Walls and rooflines in Hunston
Hunston is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as North Mundham Primary School, larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Chichester station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Hunston is about 2 miles south of Chichester, in West Sussex. For external mastic in and around Hunston, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover West Sussex from our Crawley base, Hunston included. Hunston is one of 371 places in West Sussex where we work for external mastic. Portsmouth is on our list too, about 13 miles from Hunston.
Every address in PO20 is covered for external mastic, from the main roads to the quietest streets. Streets in the area include Heath Close, Westlands Road and St Leodegars Way. We also cover Donnington (1 mile west), North Mundham (1 mile east), Runcton (1 mile east), Portfield (2 miles north) and Chichester (2 miles north). Within a short drive, we also cover Bognor Regis (4 miles east), Selsey (5 miles south), Littlehampton (11 miles east), Emsworth (8 miles west), Rustington (12 miles east) and Angmering (13 miles east).
Local landmarks in Hunston
Locally, jobs take us to homes and businesses close to Chichester High School For Girls and The Spotted Cow Public House and the streets around them. The closest station to Hunston is Chichester station, about 1.5 miles north of the centre. Well-known places in the area include St Richard's Hospital (2.3 miles north) and Chichester Castle (2 miles north).
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
- Damp that isn’t coming from the joint
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Copings & trims
How the job changes by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Signs you need external mastic in Hunston
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
If you can see any of these, it’s time to have the joints looked at:
- Failed seals between different materials
- Weeds or debris growing in open joints
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
For an older house near a landmark such as St Leodegar's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- What the quote includes, VAT included or not
- What insurance they hold
Why it’s worth doing now in Hunston
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the problem grows beyond the joint itself. Where a wall is exposed, as many are in small places like Hunston, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why Hunston clients choose us
- Colour picked to suit the job
- We never seal over old sealant
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
Take a look at how sealant jobs are priced and customer reviews.
Your questions about external mastic in Hunston
Does the coastal weather in Hunston affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Will you come out to Hunston?
Yes, Hunston is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we’ll confirm the access.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we have agreed the job, you don’t need to watch us work.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
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The process
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In a small place like Hunston, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we’re working on
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Related advice
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether there’s mould to deal with
- The type of sealant required
- How many areas need sealing
- When we can work, for business premises
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and give you a clear quote before any work starts.
What to tell us for a quote
To make quoting easier, please include:
- Access, such as stairs, a lift or height
- The rough size of the job
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
We don’t publish a price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
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 doesn’t work out, we can still put it right.