West Sussex · England
Sand Mastic in Shoreham-by-Sea
Sand mastic across Shoreham-by-Sea and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Open joints round the window box
- Weathered mastic on the most exposed windows
Sand mastic for homes and businesses in Shoreham-by-Sea
Sand mastic does not last for ever, leaving gaps round the window. We rake it out and renew it so the surround looks right again. If you have failed mastic on an exposed elevation and draughty sash windows at the surround, we can help.
In a town like Shoreham-by-Sea, older houses sit alongside newer estates, with windows of every age. In every case, the joint between frame and wall is what keeps water out.
Big or small, it’s backed by our one-year guarantee.
- Location
- Shoreham-by-Sea (BN43, BN15, BN42)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Shoreham-by-Sea homes and the weather
Shoreham-by-Sea 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 the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Buckingham Park Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to St Mary de Haura Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Shoreham-By-Sea station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Shoreham-by-Sea is about 4 miles west of Brighton and Hove, in West Sussex. Whether you are in the middle of Shoreham-by-Sea or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Shoreham-by-Sea is one of 371 places in West Sussex where we work. You can also see our page for Brighton, roughly 6 miles from Shoreham-by-Sea.
We work across BN43, BN15 and BN42 for sand mastic. If you need sand mastic at a property on Adelaide Square, High Street and Rainbow Square or anywhere close by, our applicators can take on the job. Being close to the A27 and A259, Shoreham-by-Sea is easy for our applicators to reach. Other places close to Shoreham-by-Sea include Old Shoreham (1 mile west), Kingston by Sea (1 mile east), Adur (1 mile north-west), Southwick (2 miles east) and Portslade (2 miles east). Larger places within reach include Worthing (6 miles west), Haywards Heath (14 miles north-east), Burgess Hill (10 miles north-east), Littlehampton (12 miles west), Rustington (11 miles west) and Storrington (10 miles north-west).
What’s near Shoreham-by-Sea
Locally, jobs take us to homes and businesses close to Shoreham College, The Crabtree pub and Shoreham Academy, among other places. There’s a railway station in Shoreham-by-Sea itself: Shoreham-By-Sea station. Well-known places in the area include Southlands Hospital (0.6 miles north-east). Not far away are Thundersbarrow Hill and Shoreham Beach.
Why it’s worth doing now in Shoreham-by-Sea
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. In a family home in Shoreham-by-Sea, a failed seal around a bath or a frame lets water into places you cannot see, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why us?
- Full insurance on every job
- One-year guarantee on every job
- We never seal over old sealant
- Anti-fungal sanitary silicone in wet areas
See what affects the cost and our reviews.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.
How the visit works
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours per window, depending on the condition of the joints. Parking in a town like Shoreham-by-Sea is normally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Clear the area around the work
- Tell us about any water getting in
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or email us.
Advice
Honest limits
It helps to know what we cannot do:
- Crumbling stone or brickwork round the window
- Whether work needs listed building consent
- Cracked or broken glass
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Brick reveals
- Tenement windows
- Period & listed homes
- Timber door frames
- Sash and case windows
- Stone surrounds
Aftercare tips
A little care helps the new joints last. We recommend:
- Make sure water runs off the sill
- Look over the window mastic once a year
- Take care around the mastic when scraping paint
- Plan mastic work ahead of painting
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
FAQs for Shoreham-by-Sea
Does the coastal weather in Shoreham-by-Sea 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.
Do you cover Shoreham-by-Sea for sand mastic?
Yes, Shoreham-by-Sea is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
What guarantee comes with the work?
Every job comes with our 12-month guarantee.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or drop us an email.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Are you fully insured?
Yes. Mr Mastic is fully insured.
Is consent needed for window work on a listed home?
Check with your local planning authority. They’ll tell you if consent is needed.
Towns and villages near Shoreham-by-Sea
Other services in Shoreham-by-Sea
How we quote for sand mastic
For a quick quote, just ask. What matters most is:
- The amount of work
- The old material and how stubborn it is
- The type of sealant required
- Any mould that needs treating
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and give you a clear quote before any work starts.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or send us an email.