West Sussex · England
Window & door mastic in Highleigh, West Sussex
Mastic around window and door frames, sills and patio doors in Highleigh, with a one-year guarantee on every job. Ask us for a quote.
- Untidy mastic left by window fitters
- Cracked or shrunken mastic around the frame
- Leaking joints at the ends of sills
Highleigh homes and the weather
Highleigh 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. 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.
For an older house near a landmark such as St Mary Our Lady Sidlesham, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Chichester station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Highleigh is about 3 miles north of Selsey, in West Sussex. Whether you are in the middle of Highleigh or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 371 places across West Sussex, from the larger towns to small villages. You can also see our page for Portsmouth, roughly 12 miles from Highleigh.
We cover every part of the PO20 postcode area for window mastic and the streets around it. We cover properties on Critchel's Lane, Highleigh Road and Green Lane and the roads around them. Neighbouring places we cover for window mastic include Almodington (1 mile west), Birdham (2 miles north-west), Somerley (2 miles west), Earnley (2 miles west) and Shipton Green (3 miles north-west). Within a short drive, we also cover Bognor Regis (5 miles east), Chichester (4 miles north), Selsey (3 miles south), Littlehampton (12 miles east), Emsworth (8 miles north-west) and Rustington (13 miles east).
Around Highleigh
For rail, the closest station is Chichester station, about 3.9 miles north of the centre. Nearby you will also find Chichester Castle (4.5 miles north) and Selsey Lifeboat Museum (3.5 miles south). Not far away are Pilsey Island.
Window mastic in Highleigh, done properly
There are two joints on most windows. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. If you have water coming in at the bottom corners of a door and rushed sealant from a window installation, we can put it right, on window sills, patio & French doors and aluminium frames alike.
Homes in small places like Highleigh often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Highleigh (PO20)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we are called out for in Highleigh
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar never bonded as it should, and it lets go sooner than it should.
Keep an eye out for any of the following:
- Water coming in at the bottom corners of a door
- Cracked sealant at the sill ends
- A bead that does not match the frame
- Cracked internal joints between frame and plaster
Managing a site like Sidlesham Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- When the joint can take water or movement
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- Whether you can choose the colour
Different surfaces, different methods
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
What we do, step by step
You do not need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a few frames, or a day or more for a whole house in most cases. Somewhere as small as Highleigh, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- 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
- Mention if the joints have been sealed before
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
Get a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Related advice
Quotes for window mastic in Highleigh
Every job gets its own quote. These are the things that affect it:
- Which sealant suits the joint
- Whether the work is at height
- The amount of work
- Any mould that needs treating
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before we start.
What we need to know
To make quoting easier, please include:
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- Where the property is
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.
Why deal with it now?
Choosing the product is half the job. Interior caulk and bathroom silicone are not made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Where a wall is exposed, as many are in small places like Highleigh, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Highleigh
- You choose the colour before work begins
- Rated 4.9 stars on Google
- Tidy, careful work
- A sealant colour to suit the surroundings
Read what affects the cost or customer reviews.
Towns and villages near Highleigh
More services for Highleigh
Common questions in Highleigh
Is Highleigh within the area you cover?
Yes, Highleigh is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Chichester station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
Can I add another job to the visit?
Yes. Just list everything you need and you will get one quote.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or send us an email.
How long before the joint can be used?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Avoid harsh chemicals near the mastic
- Keep drainage slots and sill grooves clear
- Do not aim a pressure washer at the joints
- Use gentle cleaners on frames and sealant
Most silicone sealants won’t take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.