West Sussex · England
External & façade joints in Sidlesham, West Sussex
External mastic in Sidlesham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
- Plants rooting in failed movement joints
How we handle external mastic in Sidlesham
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, and when it fails, the wall takes the strain and water finds a way in. If you have rain getting behind render or cladding at a joint and rigid filler in a joint that should flex, we can help, on façade panels, copings & trims and joints between brick and frames alike.
Around Sidlesham, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Sidlesham (PO20)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Sidlesham
We quote each job individually. This is what makes a difference:
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- How many areas need sealing
- Which sealant suits the joint
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Helping us quote
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- The type of property
- Pictures of the joints, sent by email
Want a quote for external mastic? Please call 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear price before work begins.
What the job involves on each surface
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap and keep the sealant to the right depth.
Places near Sidlesham
Other services in Sidlesham
How to look after the new joints
After the cure time, these simple habits help:
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
- Keep high-pressure jets off the joints
Do not paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.
Sidlesham buildings and the weather
Sidlesham is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around St Mary Our Lady Sidlesham, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For landlords with property near Chichester station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Sidlesham Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Sidlesham is about 3 miles north of Selsey, in West Sussex. Wherever you are in the PO20 postcode area, we cover external mastic for homes and businesses. 371 places in West Sussex are on our list, from the larger towns to small villages. We also work in Portsmouth, about 13 miles from Sidlesham.
All of PO20 is covered for external mastic, from the main roads to the quietest streets. You’ll find streets such as Rookery Lane, Selsey Road and Manhood Lane, all of which we cover. Sidlesham is on the B2145, which makes it straightforward to reach. We also cover the places around Sidlesham: Keynor Estate (1 mile south-west), Street End (1 mile north), Sidlesham Common (1 mile north), Fisher (2 miles north-east) and Church Norton (2 miles south). We also work in nearby towns such as Bognor Regis (4 miles east), Chichester (4 miles north), Selsey (3 miles south), Littlehampton (11 miles east), Emsworth (8 miles north-west) and Rustington (12 miles east).
What’s near Sidlesham
Sidlesham’s nearest station is Chichester station, about 3.9 miles north of the centre. Nearby you’ll also find St Richard's Hospital (4.7 miles north) and Chichester Castle (4.4 miles north).
Sidlesham: your questions answered
Does living near the coast affect external mastic in Sidlesham?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you work for landlords with property near Chichester station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Can you quote for more than one area?
Yes, we can. More than one area can be quoted together.
Do you work at height?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can I do it myself?
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.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Are you fully insured?
Yes. Full insurance covers our work.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Why act early in Sidlesham
Sealing over the top of old mastic doesn’t hold for long. The new layer cannot bond properly to old, weathered material, so the old joint is cut out fully first. Older cottages and farmhouses around Sidlesham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
Why us?
- White, clear, grey or another colour, product permitting
- One-year guarantee on every job
- Full insurance on every job
- Colour agreed with you before we start
Read our cost guide and what customers say.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Landlords and agents in Sidlesham can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
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 anything from a few hours to several days, depending on the building. Somewhere like Sidlesham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- Move anything stored near the joints
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and send you a clear quote.