West Sussex · England
Marehill Window Mastic
Window mastic for Marehill, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Whistling draughts around closed windows
- Untidy mastic left by window fitters
- Mastic that’s falling out in pieces
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
About our window mastic in Marehill
The new joint doesn’t have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. If you have water coming in at the bottom corners of a door and cracked sealant at the sill ends, we can help, whatever the surface.
Homes in small places like Marehill often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or drop us an email.
- Where
- Marehill (RH20)
- Wider area
- West Sussex
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Look round the frames every year or so
- Keep jet washers away from the mastic
- Do not use solvent cleaners on the joint
- Wipe condensation off the frames
Keep the new mastic undisturbed 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. If you notice one, it’s time to get the joint looked at.
Quotes for window mastic in Marehill
Some jobs are bigger than they look, and some smaller. The main factors:
- The number of rooms or windows
- Any working-time requirements on site
- How easy the joints are to reach
- The type of sealant required
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
To help us quote quickly, let us know:
- If someone has resealed it before
- The problem you’ve noticed
- The rough size of the job
- A few pictures by email, if you can
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before we start.
Common questions in Marehill
Do you cover Marehill for window mastic?
Yes. We work across London and the South East, and Marehill is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Marehill?
Yes, Marehill is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Does the work come with a guarantee?
Yes. Each job is covered for 12 months, inside or out.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Are you fully insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you seal the gap between the frame and the plaster indoors?
Yes. Inside, the joint between frame and plaster is sealed neatly, using a paintable sealant if you want to decorate.
When to call us in Marehill
Sun, frost and rain wear sealant out. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Signs it’s time to call us include:
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
If you let a flat or house near Pulborough station, renewing tired window mastic between tenants heads off draught and damp complaints.
What to look for in a quote
- How much experience the applicator has
- Whether they’re fully insured
- When the joint can take water or movement
- How long the guarantee is
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Also near Marehill
Other services in Marehill
Window mastic in Marehill: local notes
Historic houses like Old Place Manor (about 1.4 miles west) are a reminder that the area around Marehill has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Wiggonholt Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as St Mary's Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Marehill is about 10 miles north of Worthing, in West Sussex. If you need window mastic in Marehill, please phone 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover West Sussex. Our West Sussex coverage runs to 371 places, and Marehill is one of them. You can also see our page for Crawley, roughly 17 miles from Marehill.
Here we cover the RH20 postcode area for window mastic. Window mastic is available to properties on West Chiltington Road, Tudor Close and Kings Lane and the roads around them. Other places close to Marehill include Nutbourne (1 mile north-east), Broomershill (1 mile north-west), Wiggonholt (1 mile south), West Chiltington Common (1 mile south-east) and West Chiltington (1 mile east). Further out, we also cover Horsham (10 miles north-east), Worthing (10 miles south), Bognor Regis (14 miles south-west), Chichester (15 miles south-west), Burgess Hill (15 miles east) and Littlehampton (10 miles south).
Near you in Marehill
In Marehill, that means homes and buildings near The Rising Sun Inn, among other places. The nearest railway station is Pulborough station, roughly 1.6 miles west. Other landmarks nearby include Amberley Castle (4 miles south-west) and The Storrington And District Museum (2.9 miles south-east). Open spaces near Marehill include Amberley Wildbrooks RSPB Reserve.
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
- Faulty window hardware
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Timber windows & doors
- Composite doors
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
What happens on the day
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from an hour or two to a full day, depending on how many frames there are. Somewhere as small as Marehill, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Mention if the joints have been sealed before
- Clear the area around the work
- Let us know about stairs, lifts or work at height
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or drop us an email.