West Sussex · England
Handcross External Mastic
External mastic for Handcross and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
External mastic in Handcross, done properly
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. If you have panel joints letting water in and joints pointed up with cement by mistake, we can help, on joints between brick and frames, façade panels and copings & trims alike.
Outside joints can only be sealed when they’re dry, so work in Handcross is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a 12-month guarantee.
- Where
- Handcross (RH17)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
The process
At the end, we look at the finished work together. The visit itself normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Handcross, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Getting a quote
Want a quote for external mastic? Please call 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before any work starts.
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Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. In a small place like Handcross, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Handcross
- Sealant colour chosen to suit
- 4.9 on Google from 180+ five-star reviews
- Arbo and Everbuild products
- Homes, businesses and hotels
Take a look at what affects the cost or customer reviews.
Your questions about external mastic in Handcross
Do you cover Handcross for external mastic?
Yes, Handcross is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Do you cover smaller places like Handcross?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Do you guarantee your work?
Yes. Every job comes with a 12-month guarantee.
How long will you be here?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including the preparation. Your quote will say how long we expect yours to take.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away.
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Structural movement, which needs a surveyor or engineer
- Walls that need new movement joints cut into them
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Handcross
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- How much there is to do
- Working hours on commercial sites
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.
Helping us quote
To make quoting easier, please include:
- The address or postcode of the job
- If someone has resealed it before
- Photos by email, if that is easy
- Any access issues, like height or stairs
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
How to look after the new joints
So the new joints stay in good condition:
- Show decorators and builders where the movement joints are
- Keep movement joints as flexible joints, not mortar
- Keep water from gutters off the wall
- Get split or bare joints resealed while the damage is small
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Nearby places to Handcross
What else we do in Handcross
Handcross buildings and the weather
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. Historic houses like Tyes Place (about 1.9 miles south-east) are a reminder that the area around Handcross has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around All Saints, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Handcross Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you let a flat or house near Balcombe station, split movement joints are easy to miss on a rental until damp shows inside.
Handcross is about 4 miles south of Crawley, in West Sussex. Anywhere in RH17, we can carry out external mastic at your property. Our West Sussex coverage runs to 371 places, Handcross among them.
All of RH17 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on High Street, London Road and Windmill Platt or anywhere close by, we can help. Other places close to Handcross include Slaugham (1 mile south), Plummers Plain (2 miles south-west), Colgate (3 miles north-west), Broadfield (3 miles north) and Lower Beeding (3 miles south-west). We also work in nearby towns such as Crawley (4 miles north), Horsham (5 miles west), Haywards Heath (6 miles south-east), Burgess Hill (7 miles south-east), East Grinstead (10 miles north-east) and Shoreham-by-Sea (15 miles south).
Landmarks near Handcross
Typical jobs here are in homes near The Royal Oak Public House and Handcross Park School. For rail, the closest station is Balcombe station, about 2.8 miles east of the centre. Nearby you will also find Crawley Hospital (4.3 miles north). The countryside around Handcross includes Tilgate Lake and Blunts Wood and Paiges Meadow.