West Sussex · England
Window & door mastic in Monk's Gate, West Sussex
Window mastic for Monk's Gate, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps between the frame and the inside reveal
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
Monk's Gate questions
Can you do window mastic in Monk's Gate?
Yes, Monk's Gate is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Horsham station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is the work guaranteed?
Yes, for 12 months. A yearly look at the joints helps them last.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
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.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
What does window mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
Window mastic in Monk's Gate, done properly
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. We’re often asked to deal with rushed sealant from a window installation and mastic that has split away from the wall, on uPVC windows, composite doors and timber windows & doors.
Around Monk's Gate, 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.
Whatever the size of the job, it’s backed by our 12-month guarantee in Monk's Gate and across West Sussex.
- Location
- Monk's Gate (RH13)
- Wider area
- West Sussex
- Cover
- One year on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Monk's Gate and across West Sussex. We can quote a run of properties together, and we’re fully insured for the work.
If you manage several properties in or around Monk's Gate, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Leave it or put it right?
Failed mastic isn’t a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we’ll say so. Around Monk's Gate, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Why us?
- One-year guarantee on every job
- Homes, businesses and hotels
- Neat joints and a tidy finish
- White, clear, grey or coloured to suit, where the product allows
See our cost guide or what customers say.
When to call us in Monk's Gate
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 cannot flex. That is what backing rod is for.
The most common problems we see are:
- Leaking joints at the ends of sills
- Black, perished sealant on frames
- Rushed sealant from a window installation
- Mastic that has split away from the wall
In the older streets around Church of the Good Shepherd, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- Whether they seal over old material or remove it
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
- Which sealant they’ll use, and why
How to look after the new joints
A little care helps the new joints last. We recommend:
- Don’t paint over the silicone
- Don’t use solvent cleaners on the joint
- Walk round the house once a year and look at the joints
- Wipe condensation off the frames
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.
Towns and villages near Monk's Gate
Also in Monk's Gate
Monk's Gate homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as St Andrew's CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Horsham station, renewing tired window mastic between tenants heads off draught and damp complaints.
Monk's Gate is about 3 miles south-east of Horsham, in West Sussex. Whether you are in the middle of Monk's Gate or further out, we cover window mastic for every kind of property. Monk's Gate is one of 371 places in West Sussex where we work for window mastic. Crawley is on our list too, around 7 miles away.
Work in RH13 works the same way as everywhere else we cover. You will find streets such as Coolhurst Close, Nuthurst Road and Brighton Road, and we cover them all. Neighbouring places we cover for window mastic include Mannings Heath (1 mile north), Lower Beeding (1 mile east), Crabtree (2 miles south-east), Plummers Plain (2 miles east) and Roffey (3 miles north). We also work in nearby towns such as Crawley (7 miles north-east), Horsham (3 miles north-west), Worthing (15 miles south), Haywards Heath (9 miles east), Burgess Hill (9 miles south-east) and East Grinstead (14 miles north-east).
Landmarks near Monk's Gate
Around Monk's Gate, our work takes us to homes and buildings near The Dun Horse pub, Newells Preparatory School and The Forest School, among other places. The nearest railway station is Horsham station, about 2.6 miles north-west of the centre. A little further out are Christs Hospital School Museum (3.4 miles west) and Horsham Hospital (3 miles north-west). Open spaces near Monk's Gate include Warnham LNR.
When something else is needed
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- A failed sealed unit that has misted up
- Soft or decayed wood in the frame
- A sash or casement that won’t close properly
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Composite doors
How the visit works
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a handful of frames, longer for a whole house, depending on how much there is to do. Somewhere like Monk's Gate needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
Getting a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before we start.
Read more
How the job changes by surface
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.
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the sealant goes in between frame and wall and tooled smooth.