West Sussex · England
Window & door mastic in Southbourne, West Sussex
Window mastic in Southbourne from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- Draughty joints inside around the window
The process
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the work takes anything from an hour or two to a full day, depending on how many frames there are for a typical job. In a smaller place like Southbourne, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
How to prepare
- Mention if the joints have been sealed before
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or email us and describe the job and send pictures if you have them.
Related advice
About our window mastic in Southbourne
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on patio & French doors, window sills and timber windows & doors, and the jobs we see most are cold air getting in at the frame edge and damp patches on the reveal after heavy rain.
Many houses in smaller places like Southbourne have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Southbourne (PO10)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Southbourne
Your quote is based on your job. We look at:
- Any working-time requirements on site
- The number and length of the joints
- Which sealant suits the joint
- How many rooms, windows or areas are involved
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- How we’d reach the joints
- The problem you’ve noticed
- If someone has resealed it before
- Roughly how big the job is
Want a quote for window mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Towns and villages near Southbourne
Also in Southbourne
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
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. Everything old must be removed first.
When to call us in Southbourne
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. Backing rod sets the right depth.
Any of these means the joints need attention:
- Draughty joints inside around the window
- Mastic that’s falling out in pieces
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
If you let a flat or house near Southbourne station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- What preparation is included
- Who turns up on the day
- The length of the guarantee
- What the cure time is
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Make sure the drainage slots aren’t blocked
- Don’t use solvent cleaners on the joint
- Clean frames with a soft cloth and soapy water
- Don’t aim a pressure washer at the joints
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just ring 0345 464 0079 or send us an email.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Questions from Southbourne
Do you cover smaller places like Southbourne?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Does living near the coast affect window mastic in Southbourne?
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.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Can I paint over the new sealant?
Silicone generally will not take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we’re using and why.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can resealing stop a draught around my window?
In many cases. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
Leave it or put it right?
If you’re painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. In an older home around Southbourne, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why Southbourne customers choose us
- Anti-fungal sanitary silicone in wet areas
- Colour agreed with you before we start
- We’re fully insured
- Quality sealants from Arbo and Everbuild
Take a look at what affects the cost or our reviews.
For landlords and businesses
Letting agents and landlords in Southbourne can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
We also work for property managers and facilities teams. Several sites can be quoted together.
Windows and doors in Southbourne
Southbourne is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to St. John's include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. Managing a site like Southbourne Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Southbourne is about 4 miles east of Havant, in West Sussex. Whether you’re in the middle of Southbourne or further out, we cover window mastic for every kind of property. Southbourne is one of 371 places in West Sussex we cover for window mastic. For nearby work, see our Portsmouth page (8 miles or so).
Work in PO10 is quoted and booked the same way as anywhere else. If you need window mastic at a property on Lodgebury Close, Manor Road and Northcote Gardens or a nearby road, our applicators can take on the job. Neighbouring places we cover for window mastic include Woodmancote (1 mile north), Lumley (1 mile west), Westbourne (1 mile north-west), Emsworth (1 mile west) and Thorney Island (2 miles south-west). Within a short drive, we also cover Bognor Regis (11 miles south-east), Chichester (6 miles east), Selsey (10 miles south-east), Portfield (6 miles east), Yapton (13 miles east) and East Wittering (6 miles south).
What’s near Southbourne
In Southbourne, that means homes and buildings near The Traveller's Joy Public House, Eames Farm and Bourne Community College. There’s a railway station in Southbourne itself: Southbourne station. A little further out are Warblington Castle (2.5 miles west) and Emsworth Museum (1.3 miles west). For a walk, there’s Stoke Down and Brook Meadow (Emsworth).