West Sussex · England
Window & door mastic in Middleton-on-Sea, West Sussex
Window mastic for Middleton-on-Sea, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic that’s falling out in pieces
- Damp patches on the reveal after heavy rain
- Gaps left after new windows were fitted
What the job involves on each surface
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so they get particular care.
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
How we handle window mastic in Middleton-on-Sea
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We are often asked to deal with gaps between the frame and the inside reveal and rain getting in at the frame or under the sill, on patio & French doors, window sills and uPVC windows.
In smaller places like Middleton-on-Sea, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
All of our work is guaranteed for twelve months.
- Location
- Middleton-on-Sea (PO22, BN18)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Keep paint off silicone joints
- Don’t use solvent cleaners on the joint
- Look round the frames every year or so
- Clear any debris from frame drain holes
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
How it works
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes anything from an hour or two to a full day, depending on how many frames there are. Parking around Middleton-on-Sea is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Clear items away from the joints we are working on
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Advice
Do you need window mastic in Middleton-on-Sea?
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, and a gap filled solid can’t flex. That is what backing rod is for.
These are the problems we are asked about most:
- Cracked sealant at the sill ends
- White mastic on grey or black frames
- Black, perished sealant on frames
- Mastic that has split away from the wall
Homes close to St Nicholas Church include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
What your quote should include
- Whether they’re fully insured
- Which sealant they’ll use, and why
- What preparation is included
- Who does the work, and how experienced they are
What happens if it’s left?
Not every sealant suits a window. Decorators’ caulk and bathroom silicone are not designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In an older home around Middleton-on-Sea, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- Approved under the ARBOMaster scheme
- Colour picked to suit the job
- White, clear, grey or coloured to suit, where the product allows
- You choose the colour before work begins
Take a look at what affects the cost and what customers say.
Nearby places to Middleton-on-Sea
Other services in Middleton-on-Sea
Your questions about window mastic in Middleton-on-Sea
Does the coastal weather in Middleton-on-Sea affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are usually the first to need attention.
I let a flat near Bognor Regis station. Can you help?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Can you seal the gap between the frame and the plaster indoors?
Yes. Indoors, we seal between the frame and the plaster or reveal.
Do you come to Middleton-on-Sea?
Yes. We cover Middleton-on-Sea. To book, call 0345 464 0079 or send us an email.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
How many windows can you do in a day?
The work takes anything from an hour or two to a full day, depending on how many frames there are. Access and the amount of old mastic make the biggest difference.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us and tell us what needs doing and where.
What affects the quote in Middleton-on-Sea
You will get a clear quote before any work starts. It takes into account:
- How easy the joints are to reach
- Mould in or behind the old joints
- When we can work, for business premises
- The type of sealant required
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- Pictures of the joints, sent by email
- The problem you’ve noticed
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Middleton-on-Sea homes and the weather
Middleton-on-Sea is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. 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.
Managing a site like Bishop Tufnell CofE Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Bognor Regis station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Middleton-on-Sea is about 3 miles east of Bognor Regis, in West Sussex. Every kind of property in Middleton-on-Sea is covered for window mastic. Every job comes with our 12-month guarantee. Across West Sussex, we cover 371 places, Middleton-on-Sea among them. There’s also a page for Portsmouth, roughly 20 miles from Middleton-on-Sea.
Here we cover the PO22 and BN18 postcode area for window mastic. Window mastic is available to properties on Sea Lane, Elmer Road and Yapton Road and the roads around them. If you’re just outside Middleton-on-Sea, we cover Elmer (1 mile east), Bilsham (1 mile north), Flansham (1 mile north-west), Felpham (2 miles west) and Yapton (2 miles north). Within a short drive, we also cover Worthing (10 miles east), Bognor Regis (3 miles west), Chichester (8 miles north-west), Selsey (8 miles south-west), Littlehampton (4 miles east) and Lancing (13 miles east).
What’s near Middleton-on-Sea
Typical jobs here are in homes near Felpham Community College. The closest station to Middleton-on-Sea is Bognor Regis station, about 2.5 miles west. Nearby you’ll also find Bognor Regis Museum (2.7 miles west) and Tote Copse Castle (4.2 miles north-west).