West Sussex · England
External & façade joints in Washington, West Sussex
Sealing brickwork movement joints, render, cladding and façade joints in Washington, with a 12-month guarantee on every job. Ask us for a quote.
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether the work is at height
- The old material and how stubborn it is
- The size of the job
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we’ll go through it with you.
Asking for a quote
When you contact us, it’s useful to know:
- The type of property
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
About our external mastic in Washington
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. If you have joints where the bead has come unstuck and failed sealant between panels on a façade, we can help.
Outside joints can only be sealed when they’re dry, so work in Washington is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Washington (RH20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work can’t fix
Before booking, it’s worth knowing the limits too:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
Work for landlords, hotels and businesses
If you manage several properties in or around Washington, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
Why it’s worth doing now in Washington
Resealing a run of joints in one go is usually better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. Older cottages and farmhouses around Washington can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why Washington customers choose us
- One-year guarantee on every job
- 20+ years of sealant experience
- A choice of colours where the product allows
- An ARBOMaster approved applicator
Take a look at how sealant jobs are priced and what customers say.
Outside joints around Washington
With historic houses such as Parham House (about 3.9 miles west) nearby, there’s older building stock in the area around Washington as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like St Mary's CofE Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. In the older streets around The Parish Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain.
Washington is about 6 miles north of Worthing, in West Sussex. Anywhere in RH20, we can carry out external mastic at your property. Across West Sussex, we cover 371 places, and Washington is one of them. You can also see our page for Brighton, roughly 13 miles from Washington.
Every address in RH20 is within our area for external mastic, from the main roads to the quietest streets. We cover properties on London Road, The Street and Chanctonbury Close. We also cover the places around Washington: Rock (1 mile north), Sullington (1 mile west), Heath Common (2 miles north-west), Storrington (2 miles north-west) and Warminghurst (2 miles north). Larger places within reach include Horsham (12 miles north), Worthing (6 miles south), Bognor Regis (15 miles south-west), Haywards Heath (15 miles north-east), Burgess Hill (13 miles east) and Littlehampton (8 miles south-west).
Local landmarks in Washington
Around Washington, our work takes us to homes and buildings near Rydon Community College, Windlesham House School and The Frankland Arms Public House. A little further out are The Storrington And District Museum (2 miles north-west). For a walk, there’s Chanctonbury Hill.
What happens on the day
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In a small place like Washington, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- 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
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Different surfaces, different methods
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible year round.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Places near Washington
What else we do in Washington
Your questions about external mastic in Washington
Do you cover smaller places like Washington?
Yes, Washington is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is there a guarantee on external mastic in Washington?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
What do you need from me for a quote?
Let us know what needs doing and where, with pictures by email if possible. If we need more, we will ask.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
What does external mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we will confirm what’s needed.