West Sussex · England
Window & door mastic in Felbridge, West Sussex
Window mastic for Felbridge, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Old mastic that has gone black or come away
- Whistling draughts around closed windows
- Gaps where the sill meets the wall
How we handle window mastic in Felbridge
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that cannot move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have old mastic that has gone black or come away and cracked sealant at the sill ends, we can put it right.
Around Felbridge, 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 one-year guarantee in Felbridge and across West Sussex.
- Place
- Felbridge (RH19)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
Common problems we fix in Felbridge
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
If you can see any of these, it’s time to have the joints looked at:
- Draughts coming in around windows and doors
- Mastic that is falling out in pieces
- Rain getting in at the frame or under the sill
- Cracked sealant at the sill ends
If you let a flat or house near East Grinstead station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- Are they insured?
- How much experience the applicator has
- Which colour the sealant will be
- What happens if the job turns out different
Why act early in Felbridge
Running fresh sealant over the old joint is tempting, but new sealant cannot bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. In a small place like Felbridge, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- Experience in homes, commercial sites and hotels
- Sealant colour chosen to suit
- We leave the area clean and tidy
- You choose the colour before work begins
Read our cost guide or what customers say.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Clean frames with a soft cloth and soapy water
- Avoid harsh chemicals near the mastic
- Keep paint and stain on wooden frames in good order
- Keep drainage slots and sill grooves clear
Silicone cannot generally be painted, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
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.
What window mastic looks like in Felbridge
Historic houses like Saint Hill Manor (about 2.5 miles south-east) are a reminder that the area around Felbridge 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’s traditional sand mastic. 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.
For an older house near a landmark such as St John's Felbridge, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Felbridge Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Felbridge is about 2 miles north-west of East Grinstead, in West Sussex. Anywhere in RH19, we cover window mastic for homes and businesses. Felbridge is one of 371 towns and villages in West Sussex we cover for window mastic. Crawley is on our list too, about 6 miles from Felbridge.
Postcode districts we cover here for window mastic: RH19. Streets in the area include London Road, Mciver Close and Cherry Way, and we cover them all. Nearby, we also carry out window mastic in Furnace Wood (1 mile west), Domewood (1 mile west), Snow Hill (2 miles west), Newchapel (2 miles north) and Crawley Down (2 miles south-west). Further out, we also cover Crawley (6 miles west), Horsham (13 miles south-west), Haywards Heath (10 miles south), Burgess Hill (13 miles south), Broadfield (7 miles south-west) and Bewbush (8 miles west).
Landmarks near Felbridge
We work in homes and buildings around Bush Davies School of Theatre Arts and Imberhorne School, among other places. Felbridge’s nearest station is East Grinstead station, roughly 1.6 miles south-east of the centre. Other landmarks nearby include Effingham Park Motor Museum (1.8 miles west) and Queen Victoria Hospital (2.2 miles east). Not far away are Hedgecourt Lake.
Towns and villages near Felbridge
Also in Felbridge
Quotes for window mastic in Felbridge
The price is agreed before any work begins. It takes into account:
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- Whether the work is at height
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any previous sealing or DIY work
- A few pictures by email, if you can
- The type of property
- What’s wrong with the joints now
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or send us an email and describe the job, and photos are welcome.
What happens on the day
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours for a few frames, or a day or more for a whole house, and we explain the cure time before we leave. For a village or hamlet like Felbridge, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We clear up and check every joint is fully closed.
Before we arrive
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
- Tell us about any water getting in
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.
Advice
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Your questions about window mastic in Felbridge
Do you work for landlords with property near East Grinstead station?
Yes. We work for landlords and letting agents as well as householders. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Is Felbridge within the area you cover?
Yes. Felbridge is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can I paint over the new sealant?
Not usually, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Where is Mr Mastic based?
We work from Crawley. We cover Felbridge and the rest of West Sussex.
Will there be a smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.