West Sussex · England
External Mastic in Arundel
Sealing brickwork movement joints, render, cladding and façade joints in Arundel, with a 12-month guarantee on every job. Ask us for a quote.
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Water getting into walls through failed joints
How we handle external mastic in Arundel
Low-level joints can normally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. We work on render & cladding joints, façade panels and copings & trims, and the jobs we see most are sealant that has lost its bond to the brick or render and joints with sealant missing in places.
Homes around Arundel range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Arundel (BN18)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
The process
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take anything from a few hours to several days, depending on the building. For a job in Arundel, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
Read more
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Common problems we fix in Arundel
A lot of failed joints come down to preparation: 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 when they notice something like this:
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
Homes close to Trinity Congregational Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- Whether they’re fully insured
- What the cure time is
- How much experience the applicator has
- What product goes in the joint
Arundel buildings and the weather
Historic houses like Ecclesden Manor (about 4.3 miles south-east) are a reminder that the area around Arundel has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
If you let a flat or house near Arundel station, outside joints that have cracked can let damp into a rental, so check them between lets. Managing a site like St Philip's Catholic Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Arundel is about 3 miles north-west of Littlehampton, in West Sussex. Across the BN18 area, we cover external mastic for homes and businesses. Across West Sussex, we cover 371 places, and Arundel is one of them. Our Brighton page covers work nearby (19 miles or so).
Every address in BN18 is within our area for external mastic. Whether your property is on London Road, High Street and Arundel Relief Road or anywhere close by, our applicators can take on the job. Main roads around Arundel include the A27 and A284, which makes travel easy. Neighbouring places we cover for external mastic include Crossbush (1 mile south-east), Tortington (1 mile south-west), Warningcamp (2 miles east), Lyminster (2 miles south) and Ford (2 miles south-west). Within a short drive, we also cover Worthing (7 miles east), Bognor Regis (7 miles south-west), Chichester (10 miles west), Selsey (13 miles south-west), Littlehampton (3 miles south-east) and Shoreham-by-Sea (13 miles east).
What’s near Arundel
Locally, jobs take us to homes and businesses close to Arundel Park and The Newburgh Arms. The nearest railway station is Arundel station, roughly 0.7 miles south-east. A little further out are Arundel Castle (under half a mile north-east) and Arundel and District Hospital (less than half a mile north-west). For a walk, there’s Bignor Hill and WWT Arundel.
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Homes in smaller places like Arundel can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and give you a clear price before any work starts.
Why Arundel customers choose us
- ARBOMaster approved applicator
- Colour agreed with you before any work starts
- Fully insured
- Anti-fungal silicone where joints get wet
See what affects the cost and our reviews.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Don’t let climbing plants root in the sealant
- Deal with leaking gutters that soak the joints below
- Keep movement joints as flexible joints, not mortar
- Wash walls gently around the sealant
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
Questions from Arundel
Can you help a landlord with a rental near Arundel station?
Yes. We work for landlords and letting agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is Arundel within the area you cover?
Yes, Arundel is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Can you do several jobs on one visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
How much does external mastic cost in Arundel?
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. We agree the price before any work begins.
Are you fully insured?
Yes. We’re fully insured.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.
Places near Arundel
What else we do in Arundel
What sealant work can’t fix
It helps to know what we can’t do too:
- Structural movement, which needs a surveyor or engineer
- Render that’s blown, hollow or coming away
- Damp that is not coming from the joint
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Render & cladding joints
- Joints between brick and frames