West Sussex · England
Window & door mastic in Hassocks, West Sussex
Mastic around window and door frames, sills and patio doors for Hassocks, backed by a one-year guarantee. Call for a quick quote.
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
- Cracked internal joints between frame and plaster
How we handle window mastic in Hassocks
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. We work on timber windows & doors, composite doors and patio & French doors, and people most often call us about whistling draughts around closed windows and untidy mastic left by window fitters.
In smaller places like Hassocks, 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.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Hassocks (BN6)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in Hassocks
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. Backing rod sets the right depth.
Keep an eye out for these signs:
- Gaps left after new windows were fitted
- Mastic that’s falling out in pieces
- White mastic on grey or black frames
- Cracked internal joints between frame and plaster
Letting a property close to Hassocks station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Before you book anyone
- How the colour is chosen
- Whether VAT is included
- Who turns up on the day
- Whether they’re fully insured
Window mastic in Hassocks: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Hassocks Infant School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near St Francis of Assisi, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Hassocks is about 2 miles south of Burgess Hill, in West Sussex. Homes, rented property, offices and hotels in Hassocks can book us for window mastic, old or new, large or small. The work is guaranteed for a year. 371 places in West Sussex are on our list, large and small. We also work in Brighton, around 7 miles away.
Every address in BN6 is covered for window mastic. Window mastic is available to properties on London Road, Semley Road and Farm Close and the roads around them. If you are just outside Hassocks, we cover Keymer (1 mile east), Hurst Wickham (1 mile north-west), Clayton (1 mile south), Hurstpierpoint (1 mile north-west) and Ditchling (1 mile east). We also work in nearby towns such as Crawley (13 miles north), Horsham (12 miles north-west), Worthing (13 miles south-west), Haywards Heath (5 miles north-east), East Grinstead (15 miles north-east) and Shoreham-by-Sea (8 miles south-west).
Near you in Hassocks
Typical jobs here are in homes near Downlands Community School and The Hassocks pub. Hassocks has its own railway station: Hassocks station. Well-known places in the area include The Budding Foundation Museum of Gardening (under half a mile south-west) and Clayton Castle (1.2 miles south). The countryside around Hassocks includes Bedelands Farm Nature Reserve and Wolstonbury Hill.
Can I do it myself?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Surface by surface
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Wash the frames with mild soapy water
- Walk round the house once a year and look at the joints
- Paint up to the joint, not over it
- Don’t use solvent cleaners on the joint
Keep the new mastic undisturbed while it cures, for as long as we advise. Do not point a pressure washer at the joints.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Also near Hassocks
Also in Hassocks
How it works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes most of a day for a typical house, less for a few frames, depending on the amount of work. A visit to Hassocks is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- 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.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Related advice
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In an older home around Hassocks, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
Why us?
- Tidy, careful work
- More than 20 years in sealant work
- An ARBOMaster approved applicator
- 180+ five-star Google reviews
See what affects the cost and customer reviews.
Hassocks questions
Can you help a landlord with a rental near Hassocks station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover smaller places like Hassocks?
Yes, Hassocks is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch and we’ll plan for it.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. We’ll tell you how long your job needs when we quote.
Are you fully insured?
Yes. Full insurance covers our work.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What does window mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before any work starts.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Landlord and commercial work in Hassocks
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.