West Sussex · England
Window Mastic in Crabtree
Specialist window mastic for Crabtree: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Mastic that’s falling out in pieces
- Draughts coming in around windows and doors
- Cracked internal joints between frame and plaster
Why it’s worth doing now in Crabtree
The work is quick compared with the damage it prevents: the visit takes most of a day for a typical house, less for a few frames. Wait for damp to appear and there may be plaster and decorating to sort out too. Older cottages and farmhouses around Crabtree can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why Crabtree clients choose us
- 180+ five-star Google reviews
- We agree the colour with you first
- Full insurance on every job
- A choice of colours where the product allows
See how sealant jobs are priced and our reviews.
Window mastic in Crabtree, done properly
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on window sills, composite doors and uPVC windows, and common reasons people get in touch are cold air getting in at the frame edge and rain getting in at the frame or under the sill.
Around Crabtree, 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.
You get a 12-month guarantee, the same in Crabtree as everywhere else we work.
- Location
- Crabtree (RH13)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Window mastic in Crabtree: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Tyes Place (about 4.3 miles north-east) nearby, there’s older building stock in the area around Crabtree as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Newells Preparatory School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Old Church House the Glebe, the joint between an old wall and a newer frame is generally the first place rain gets in. Rented homes near Horsham station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Crabtree is about 5 miles south-east of Horsham, in West Sussex. Homes, rented property, offices and hotels in Crabtree can book us for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 371 towns and villages across West Sussex, large and small. Crawley is on our list too, about 7 miles from Crabtree.
Here we cover the RH13 postcode area for window mastic. Window mastic is available to properties on Mill Lane, Peppersgate and Long Hill. Close by, we work in Lower Beeding (1 mile north), Colwood (1 mile south-east), Monk's Gate (2 miles north-west), Plummers Plain (2 miles north-east) and Mannings Heath (2 miles north-west). Larger places within reach include Crawley (7 miles north-east), Horsham (5 miles north-west), Worthing (14 miles south-west), Haywards Heath (7 miles east), Burgess Hill (7 miles south-east) and East Grinstead (13 miles north-east).
Around Crabtree
We work in homes and buildings around Leonardslee. For rail, the closest station is Horsham station, roughly 4.6 miles north-west. Other landmarks nearby include Horsham Hospital (4.9 miles north-west). Green spaces nearby include Knepp Wildland.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Towns and villages near Crabtree
What else we do in Crabtree
How to look after the new joints
A little care helps the new joints last. Our advice:
- Don’t use solvent cleaners on the joint
- Clean frames with a soft cloth and soapy water
- Make sure the drainage slots aren’t blocked
- Keep timber frames painted
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just call 0345 464 0079 or email us.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere as small as Crabtree, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- 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
- On commercial sites, let us know about site rules
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details.
Related advice
When something else is needed
In fairness, some problems need a different trade:
- Soft or decayed wood in the frame
- Condensation trapped between the panes
- A sash or casement that won’t close properly
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before booking.
What we seal
- Aluminium frames
- uPVC windows
- Window sills
- Timber windows & doors
- Composite doors
- Patio & French doors
Landlords, agents and businesses in Crabtree
Letting agents often deal with us directly. Tell us the address, the job and how access works.
If you manage several properties in or around Crabtree, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
FAQs for Crabtree
Do you cover smaller places like Crabtree?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Horsham 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’ll give you a clear price.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Is the new sealant paintable?
Most silicone can’t be painted. Let us know beforehand, and we will use a paintable product where it suits.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or email us.
Do you guarantee window mastic?
Yes. Each job is covered for 12 months.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
What affects the cost of window mastic
There’s no set price list, because jobs vary so much. What we look at:
- Working hours on commercial sites
- The size of the job
- How easy the joints are to reach
- The number of rooms or windows
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- The rough size of the job
- If someone has resealed it before
- A few pictures by email, if you can
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.