West Sussex · England
Window Mastic in Horsted Keynes
Professional window mastic in and around Horsted Keynes, with old sealant always removed completely and a 12-month guarantee.
- Gaps where the sill meets the wall
- Gaps between the frame and the inside reveal
- A bead that doesn’t match the frame
What happens if it’s left?
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. In a small place like Horsted Keynes, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Leaving a failed joint usually makes the job bigger, not smaller. If you are unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Horsted Keynes
- Anti-fungal sanitary silicone in wet areas
- We are fully insured
- Approved under the ARBOMaster scheme
- We never seal over old sealant
Take a look at our cost guide or what customers say.
Window mastic for homes and businesses in Horsted Keynes
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. If you have gaps left after new windows were fitted and draughty joints inside around the window, we can put it right, whatever the surface.
Somewhere as small as Horsted Keynes, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Your job is guaranteed for a year, as with all our work.
- Place
- Horsted Keynes (RH17)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We will tell you if that’s what we find.
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A tidy bead in anthracite grey, black or a matching colour suits the frame.
What affects the quote in Horsted Keynes
We quote each job individually. This is what makes a difference:
- How many rooms, windows or areas are involved
- Access and height
- The size of the job
- Any working-time requirements on site
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Any previous sealing or DIY work
- Where the job is, and your postcode
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
For window mastic in Horsted Keynes, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Common problems we fix in Horsted Keynes
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant cannot stretch, it splits.
The most common problems we see are:
- Rain getting in at the frame or under the sill
- Black, perished sealant on frames
- Gaps between the frame and the inside reveal
- Cracked sealant at the sill ends
If you let a flat or house near Haywards Heath station, renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before you book
- What happens if they find a problem under the old sealant
- What the cure time is
- What product goes in the joint
- How much experience the applicator has
Common questions in Horsted Keynes
Is Horsted Keynes within the area you cover?
Yes, Horsted Keynes is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Haywards Heath station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Can you match the sealant to my frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Are you fully insured?
Yes. We are fully insured.
Towns and villages near Horsted Keynes
Other services in Horsted Keynes
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Horsted Keynes and across West Sussex. We can quote a run of properties together, and we’re fully insured for the work.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
Windows and doors in Horsted Keynes
Historic houses like Priest House (about 3 miles north-west) are a reminder that the area around Horsted Keynes has older buildings as well as new. In older buildings, 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as St Giles CofE Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near St Giles' Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Horsted Keynes is about 4 miles north-east of Haywards Heath, in West Sussex. If you need window mastic in Horsted Keynes, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover West Sussex. Across West Sussex, we cover 371 places, Horsted Keynes among them. We also work in Crawley, about 9 miles from Horsted Keynes.
Every address in RH17 is covered for window mastic, from the main roads to the quietest streets. We cover properties on Station Road, Rixons Orchard and Leighton Road and the roads around them. Close by, we work in Danehill (1 mile east), Birchgrove (2 miles north-east), Highbrook (2 miles north-west), Chelwood Common (2 miles east) and Furner's Green (2 miles south-east). Further out, we also cover Crawley (9 miles north-west), Horsham (13 miles west), Haywards Heath (4 miles south-west), Burgess Hill (7 miles south-west), East Grinstead (6 miles north) and Broadfield (9 miles north-west).
Near you in Horsted Keynes
Typical jobs here are in homes near The Green Man pub and the streets around them. The nearest railway station is Haywards Heath station, about 4 miles south-west. Nearby you’ll also find Waterbury Castle (less than half a mile north-west) and Princess Royal Hospital (4.1 miles south-west). For a walk, there’s Blunts Wood and Paiges Meadow.
How the visit works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from an hour or two to a full day, depending on how many frames there are. For a village or hamlet like Horsted Keynes, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
Getting a quote
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or email us and describe the job, and pictures are welcome.