West Sussex · England
Window & door mastic in Merston, West Sussex
Window mastic for Merston and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
- White mastic on grey or black frames
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- A sash or casement that will not close properly
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A frame that has rotted at the joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Timber windows & doors
- Composite doors
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
About our window mastic in Merston
Homes in Merston have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We’re often asked to deal with rushed sealant from a window installation and gaps where the sill meets the wall, across composite doors, aluminium frames and timber windows & doors.
Around Merston, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Merston (PO20)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about window mastic in Merston
Is Merston within the area you cover?
Yes, Merston is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you do window mastic in Merston?
Yes. We work across London and the South East, and Merston is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Will the old sealant be removed?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of frames, longer for a whole house, and we explain the cure time before we leave. Somewhere like Merston needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
How to get a quote
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 give you a clear quote before we start.
Advice
What affects the quote in Merston
The price is agreed before any work begins. It’s based on:
- How many areas need sealing
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Helping us quote
Before you ask for a quote, have a think about:
- Where the job is, and your postcode
- If someone has resealed it before
- Photos by email, if that’s easy
- Any access issues, like height or stairs
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or send us an email with the details, and pictures are welcome.
Keeping the joints in good condition
So the new joints stay in good condition:
- Repaint timber before it’s bare
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
- Clean frames with a soft cloth and soapy water
Try not to touch the new joint while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Places near Merston
What else we do in Merston
Why it’s worth doing now in Merston
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. In a small place like Merston, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Merston
- Colour agreed with you before any work starts
- Domestic, commercial and hotel work
- White, clear, grey or coloured to suit, where the product allows
- Approved under the ARBOMaster scheme
Windows and doors in Merston
With historic houses such as Goodwood House (about 3.5 miles north) nearby, there’s older building stock in the area around Merston as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Giles include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as North Mundham Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Chichester station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Merston is about 3 miles south-east of Chichester, in West Sussex. Whether you are in the middle of Merston or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our West Sussex coverage runs to 371 places, Merston among them. You can also see our page for Portsmouth, about 15 miles away.
We cover every part of the PO20 postcode area for window mastic and the streets around it. If you’re just outside Merston, we cover Runcton (1 mile south-west), Colworth (1 mile east), Oving (1 mile north), North Mundham (1 mile west) and Lagness (1 mile south). We also work in nearby towns such as Worthing (15 miles east), Bognor Regis (3 miles south-east), Chichester (3 miles north-west), Selsey (6 miles south), Littlehampton (9 miles east) and Emsworth (9 miles west).
Landmarks near Merston
Locally, jobs take us to homes and businesses close to Chichester High School For Girls and the streets around them. The closest station to Merston is Chichester station, about 2.3 miles west of the centre. A little further out are The Chichester City Museum (2.3 miles north-west) and St Richard's Hospital (2.3 miles north-west).
Can I do it myself?
A careful DIYer can reseal a simple joint, 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.
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.
Surface by surface
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. We cut it out, back any deep gaps and reseal properly.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.