Brighton and Hove · England
External & façade joints in Withdean, Brighton and Hove
Sealing brickwork movement joints, render, cladding and façade joints in Withdean, with a 12-month guarantee on every job. Ask us for a quote.
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
Why act early in Withdean
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last so it’s worth doing right. Around Withdean, 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.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why choose Mr Mastic in Withdean
- White, clear, grey or another colour, product permitting
- We leave the area clean and tidy
- 20+ years of sealant experience
- ARBOMaster approved applicator
Take a look at our cost guide or our reviews.
About our external mastic in Withdean
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. We are often asked to deal with old sealant gone brittle and cracked and cracked joints where brick meets render or frames, on render & cladding joints, brickwork movement joints and concrete & block.
In and around Withdean, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
There’s a 12-month guarantee on every job.
- Where
- Withdean (BN1, BN3)
- Region
- Brighton and Hove
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. In a smaller place like Withdean, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will take it from there.
Read more
Your questions about external mastic in Withdean
Is external mastic in a coastal place like Withdean any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Do you work for landlords with property near Preston Park station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we’re fully insured.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Where do you work from?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Towns and villages near Withdean
Other services in Withdean
Should I try it myself first?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Quotes for external mastic in Withdean
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- How easy the joints are to reach
- Mould in or behind the old joints
- When we can work, for business premises
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.
What we need to know
Photos by email are helpful but not essential. Please mention:
- The problem you’ve noticed
- Any access issues, like height or stairs
- Photos by email, if that is easy
- Any previous sealing or DIY work
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Structural movement, which needs a surveyor or engineer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Façade panels
What we are called out for in Withdean
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.
These are the problems we’re asked about most:
- Leaking joints around cladding and façade panels
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
If you look after a building such as St Bernadette's Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- How hidden problems are handled
- How much experience the applicator has
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
What external mastic looks like in Withdean
Withdean 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. With historic houses such as Preston Manor & Gardens (about 0.6 miles south) nearby, there’s older building stock in the area around Withdean as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you live in an older home near St John the Evangelist's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Preston Park station, outside joints that have cracked can let damp into a rental, so check them between lets.
Withdean is about 2 miles north-west of Brighton, in Brighton and Hove. Withdean gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Withdean is one of 30 places in Brighton and Hove we cover for external mastic.
Here we cover the BN1 and BN3 postcode area for external mastic. Whether your property is on Home Road, Croft Road and Bates Road or a nearby road, we can help. Withdean is on the A23, which makes it straightforward to reach. Other places close to Withdean include Preston (1 mile south), Westdene (1 mile north-west), Prestonville (1 mile south), Patcham (1 mile north) and Hollingdean (1 mile south-east). Within a short drive, we also cover Kemptown (3 miles south-east), Whitehawk (3 miles south-east), Saltdean (6 miles south-east), East Saltdean (6 miles south-east), Roedean (3 miles south-east) and Rottingdean (5 miles south-east).
Near you in Withdean
Around Withdean, our work takes us to homes and buildings near Dorothy Stringer High School, Varndean College and Withdean Park, among other places. There’s a railway station in Withdean itself: Preston Park station. A little further out are Churchill Square (1.9 miles south) and Brighton Transport Museum (0.8 miles south). Not far away are Newmarket Hill and Ladies Mile.