West Sussex · England
Window Mastic in Southwater
Window mastic across Southwater and nearby, with every bit of old sealant taken out first.
- Rushed sealant from a window installation
- Draughty joints inside around the window
- Leaking joints at the ends of sills
Window mastic for homes and businesses in Southwater
There are two joints on most windows. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. We work on window sills, uPVC windows and composite doors, and the jobs we see most are rushed sealant from a window installation and a bead that doesn’t match the frame.
Around Southwater, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Southwater (RH13)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
To keep the joints looking good and working properly:
- Do not use solvent cleaners on the joint
- Keep paint off silicone joints
- Don’t aim a pressure washer at the joints
- Walk round the house once a year and look at the joints
Most silicone sealants will not take paint, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Places near Southwater
Other services in Southwater
Quotes for window mastic in Southwater
For a quick quote, just ask. The main things that affect it are:
- Any working-time requirements on site
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Asking for a quote
When you contact us, these details help:
- The type of property
- The address or postcode of the job
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before any work starts.
When something else is needed
Sealant is not the answer to every problem, and we’ll tell you before we start. Sealant won’t put right:
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
- Faulty window hardware
If you’re not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- uPVC windows
- Patio & French doors
- Composite doors
- Aluminium frames
- Timber windows & doors
- Window sills
How it works
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a morning for a couple of windows and a door and we leave things clean and tidy. A visit to Southwater is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Related advice
Landlord and commercial work in Southwater
We work for landlords and letting agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
For anyone letting property in or around Southwater, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Questions from Southwater
Is Southwater in your area for window mastic?
Yes, Southwater is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Can you help a landlord with a rental near Christs Hospital station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
What do you need from me for a quote?
A short description and the location, with photos by email if possible. If we need more, we’ll ask.
Is the work guaranteed?
Yes. Our 12-month guarantee covers every job, inside or out.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What sealant do you use?
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.
What the job involves on each surface
Composite doors
An exposed front door gets wind-driven rain. Those corners get the most care.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Windows and doors in Southwater
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Christs Hospital station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Managing a site like Southwater Infant Academy? Then its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Holy Innocents Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Southwater is about 3 miles south of Horsham, in West Sussex. If you need window mastic in Southwater, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover West Sussex. We cover 371 towns and villages across West Sussex. Our Crawley page covers work nearby (9 miles or so).
We cover every part of the RH13 postcode area for window mastic and the streets around it. You will find streets such as Station Road, Walmer Close and Pevensey Road, and we cover them all. If you are just outside Southwater, we cover Tower Hill (2 miles north), Nuthurst (2 miles east), Brooks Green (2 miles west), Barns Green (2 miles west) and Maplehurst (2 miles south-east). Larger places within reach include Crawley (9 miles north-east), Horsham (3 miles north), Worthing (14 miles south), Haywards Heath (11 miles east), Burgess Hill (11 miles south-east) and Shoreham-by-Sea (13 miles south).
Landmarks near Southwater
We work in homes and buildings around The Lintot pub and The Doyle School of Design and Technology and the streets around them. The nearest railway station is Christs Hospital station, roughly 1.9 miles north-west. Well-known places in the area include Christs Hospital School Museum (1.5 miles north-west) and Horsham Hospital (3.2 miles north). For a walk, there’s Knepp Wildland.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.