West Sussex · England
External & façade joints in Whitehall, West Sussex
Specialist external mastic for Whitehall: careful preparation, the right product and tidy work. Call for a quick quote.
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
External mastic for homes and businesses in Whitehall
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. If you have cracked joints where brick meets render or frames and sealant pulling away from one side of the joint, we can help, whatever the surface.
External sealant needs dry, clean surfaces, so work around Whitehall is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Place
- Whitehall (RH13)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
Aftercare is simple:
- Ask before painting over external sealant
- Deal with leaking gutters that soak the joints below
- Keep soil, plants and ivy away from the joints
- Act on the first splits you see
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Whitehall buildings and the weather
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near The Church of St Mary the Virgin, the joints between older walls, newer extensions and the roofline need a sealant that can move. For site and facilities teams at buildings such as Shipley CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Whitehall is about 6 miles south-west of Horsham, in West Sussex. For external mastic in and around Whitehall, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We are based in Crawley and cover West Sussex. Across West Sussex, we cover 371 places, and Whitehall is one of them. Crawley is on our list too, about 12 miles from Whitehall.
Jobs for external mastic in RH13 works the same way as everywhere else we cover. Neighbouring places we cover for external mastic include Shipley (1 mile north-east), Broomer's Corner (1 mile west), Dragons Green (1 mile north), Dial Post (2 miles south-east) and West Grinstead (2 miles east). Within a short drive, we also cover Crawley (12 miles north-east), Horsham (6 miles north-east), Worthing (11 miles south), Haywards Heath (12 miles east), Burgess Hill (11 miles east) and Littlehampton (13 miles south-west).
What’s near Whitehall
Whitehall’s nearest station is Billingshurst station, about 3.8 miles north-west. For a walk, there’s Knepp Wildland.
What we’re called out for in Whitehall
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The problems people normally mention when they call include:
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
- Joints with sealant missing in places
Rented homes near Billingshurst station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Before booking anyone
- What happens if the job turns out different
- Is the old sealant removed completely?
- Who turns up on the day
- Whether you can choose the colour
Whitehall questions
Do you work for landlords with property near Billingshurst station?
Yes. We work for landlords and letting agents as well as householders. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Whitehall?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours to a few days, depending on the length of joint and the access. We’ll give you a better idea when we quote.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
What the job involves on each surface
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Landlord and commercial work in Whitehall
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Why deal with it now?
Resealing a run of joints in one go is normally better than patching one at a time. Joints of the same age tend to fail together. Older cottages and farmhouses around Whitehall can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, 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.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- ARBOMaster approved applicator
- Colour agreed with you before any work starts
- Fully insured
Read what affects the cost or what customers say.
What we do, step by step
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. For a village or hamlet like Whitehall, 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.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
- Tell us about any previous sealing or DIY attempts
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Advice
What affects the cost of external mastic
There’s no set price list, because no two jobs are the same. What we look at:
- How many rooms, windows or areas are involved
- Whether the work is at height
- The size of the job
- Mould in or behind the old joints
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will explain what it covers.
Helping us quote
Before you ask for a quote, have a think about:
- The type of property
- Photos by email, if that’s easy
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details, and photos are welcome.