West Sussex · England
Window Mastic in Langley Green
Window mastic for Langley Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rain getting in at the frame or under the sill
- Draughts coming in around windows and doors
- Leaking joints at the ends of sills
How it works
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take most of a day for a typical house, less for a few frames. In a smaller place like Langley Green, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
How to prepare
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
- Mention any parking rules near the property
Ask for a quote
If you’re in Langley Green and need window mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
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How we handle window mastic in Langley Green
Frames and walls don’t move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. We are often asked to deal with cracked internal joints between frame and plaster and hard, cracked sealant around windows, across timber windows & doors, composite doors and aluminium frames.
Many houses in smaller places like Langley Green have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
Each job carries a 12-month guarantee, large or small.
- Place
- Langley Green (RH11, RH10)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Resealing frames is a short job: the visit takes a few hours for a handful of frames, longer for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Around Langley Green, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why Langley Green customers choose us
- Tidy, careful work
- Trusted Arbo and Everbuild sealants
- Anti-fungal silicone where joints get wet
- 180+ five-star Google reviews
What affects the cost of window mastic
We quote each job individually. These are the things that affect it:
- The type of sealant required
- Any mould that needs treating
- How easy the joints are to reach
- When we can work, for business premises
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and give you a clear price before work begins.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- How we’d reach the joints
- Whether it’s a home or a business
- Roughly how big the job is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Towns and villages near Langley Green
More services for Langley Green
Looking after it afterwards
To keep the joints looking good and working properly:
- Look round the frames every year or so
- Keep timber frames painted
- Clear any debris from frame drain holes
- Don’t use solvent cleaners on the joint
Most silicone sealants will not take paint, so if you’re planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Different surfaces, different methods
Composite doors
A composite door usually sits in a plastic outer frame, and the joint around it is sealed like a window. We match the colour to the frame.
Aluminium frames
Coated aluminium needs a compatible sealant. Neutral-cure sealant is the safe choice.
Window mastic in Langley Green: local notes
Langley Green is part of Crawley, one of the post-war new towns. Many homes date from the post-war decades, and many will have had their original windows replaced. That mastic ages as well, and sills and frame heads are where leaks start. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Langley Green Primary, larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Crawley station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Langley Green is about 1 mile north of Crawley, in West Sussex. Homes, rented property, offices and hotels in Langley Green is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Langley Green is one of 371 towns and villages in West Sussex we cover.
Our applicators cover all of the RH11 and RH10 postcode area for window mastic. You’ll find streets such as London Road, Cherry Lane and Dobson Road, and we cover them all. We also cover the places around Langley Green: West Green (1 mile south), Crawley (1 mile south), Three Bridges (2 miles south-east), Southgate (2 miles south) and Forge Wood (2 miles east). Within a short drive, we also cover Horsham (7 miles south-west), Haywards Heath (10 miles south-east), Burgess Hill (12 miles south), East Grinstead (8 miles east), Broadfield (3 miles south) and Billingshurst (14 miles south-west).
Near you in Langley Green
We work in homes and buildings around Dr Samuel Johnson pub, Central Sussex College and Hazelwick School and the streets around them. The nearest railway station is Crawley station, roughly 1.4 miles south. Nearby you will also find Crawley Museum (1 mile south) and Langley Green Hospital (within half a mile south). Green spaces nearby include Tilgate Lake.
Langley Green questions
Do you cover smaller places like Langley Green?
Yes, Langley Green is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Should the sealant in an older Langley Green home be renewed?
In most cases, yes, if it hasn’t been done for a while. Sealant does not last for ever, and its life depends on use, cleaning and weather, and many homes in Langley Green may already be on their second or third set.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Do you do commercial work?
Yes. We can plan bigger jobs in stages.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Signs you need window mastic in Langley Green
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
Keep an eye out for these signs:
- Mastic that is falling out in pieces
- Sealant in the wrong colour for the frame
- Cracked or shrunken mastic around the frame
- Draughty joints inside around the window
If you live in an older home near Voice of Deliverance Full Gospel Church of God, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- What product goes in the joint
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first