West Sussex · England
Window & door mastic in Southwick, West Sussex
Professional window mastic in and around Southwick, with old sealant always removed completely and a one-year guarantee.
- Sealant in the wrong colour for the frame
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
FAQs for Southwick
Does the coastal weather in Southwick affect outside sealant?
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.
Can you help a landlord with a rental near Southwick station?
Yes. We work for landlords and letting agents as well as homeowners. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is the work guaranteed?
Yes. Our 12-month guarantee covers every job.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Window mastic in Southwick
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on aluminium frames, timber windows & doors and uPVC windows, and people most often call us about sealant in the wrong colour for the frame and mastic that’s falling out in pieces.
In a smaller place like Southwick, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
Each job carries a 12-month guarantee, large or small.
- Where
- Southwick (BN42, BN41, BN43)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the job takes a morning for a couple of windows and a door for a typical job. In a smaller place like Southwick, 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, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we are working on
- Let us know about earlier repairs to the joints
How to get a quote
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or send us an email and describe the job and send photos if you have them.
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What window mastic looks like in Southwick
Southwick 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 window and door frames, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts 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 Michael and All Angels Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Southwick station, renewing tired window mastic between tenants heads off draught and damp complaints.
Southwick is about 2 miles east of Shoreham-by-Sea, in West Sussex. If you need window mastic in Southwick, please ring 0345 464 0079 or email us for a quick quote. We cover West Sussex from our Crawley base. Southwick is one of 371 places in West Sussex we cover for window mastic.
Our applicators cover all of BN42, BN41 and BN43 for window mastic and the streets around it. Whether your property is on Station Road, Roman Crescent and Southwick Street or a nearby road, we can help. Main roads around Southwick include the A259 and A270, so getting to you is simple. We also cover the places around Southwick: Kingston by Sea (1 mile north-west), Portslade (1 mile north-east), Shoreham-by-Sea (2 miles west), Hangleton (2 miles north-east) and Old Shoreham (2 miles west). Larger places within reach include Worthing (7 miles west), Haywards Heath (13 miles north-east), Burgess Hill (10 miles north-east), Littlehampton (13 miles west), Lancing (4 miles west) and Rustington (12 miles west).
Landmarks near Southwick
We work in homes and buildings around Shoreham Academy, Benfield Hill and The Ship Inn, among other places. There’s a railway station in Southwick itself: Southwick station. Other landmarks nearby include Southlands Hospital (1 mile west) and Churchill Square (4 miles east). Open spaces near Southwick include Shoreham Beach and Thundersbarrow Hill.
What happens if it’s left?
Resealing frames is a short job: the visit takes a few hours for a handful of frames, longer for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. In an older home around Southwick, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Southwick
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work
- An ARBOMaster approved applicator
Take a look at how sealant jobs are priced and customer reviews.
Quotes for window mastic in Southwick
Call for a quick quote. The main things that affect it are:
- The type of sealant required
- How many areas need sealing
- Mould in or behind the old joints
- How much there is to do
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Helping us quote
To make quoting easier, let us know:
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- Where the property is
- Pictures of the joints, sent by email
Want a quote for window mastic? Please phone 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before we start.
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Condensation trapped between the panes
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Window sills
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Composite doors
- Aluminium frames
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
If you manage several properties in or around Southwick, several properties can be quoted together. Send us the addresses and the work at each.
When to call us in Southwick
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Signs it’s time to call us include:
- Hard, cracked sealant around windows
- White mastic on grey or black frames
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
Schools such as Eastbrook Primary Academy are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- How the surfaces are prepared before sealing
- Whether all the old sealant comes out first
- What happens if the job turns out different
- Whether the sealant suits the joint
Places near Southwick
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Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you are 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.