West Sussex · England
External & façade joints in Donnington, West Sussex
External mastic across Donnington and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Rigid filler in a joint that should flex
External mastic in Donnington, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We work on façade panels, concrete & block and copings & trims, and people most often call us about joints pointed up with cement by mistake and moss and dirt in joints with no sealant left.
Somewhere as small as Donnington, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
Big or small, you get the same 12-month guarantee.
- Where
- Donnington (PO20)
- Wider area
- West Sussex
- Cover
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When it isn’t the sealant
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Damp that is not coming from the joint
- Subsidence or other structural problems
- Loose or hollow render, which needs re-rendering
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Concrete & block
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Wash walls gently around the sealant
- Act on the first splits you see
- Keep water from gutters off the wall
- Point out the joints to other trades
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Also near Donnington
Other services in Donnington
External mastic in Donnington: local notes
Donnington is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. 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 landlords with property near Chichester station, split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near The Parish Church of St George, an extension built onto an older house moves differently, and the joint between them takes the strain.
Donnington is about 2 miles south of Chichester, in West Sussex. Our applicators cover external mastic for homeowners, landlords and businesses in Donnington, as part of our work across West Sussex. Our area takes in 371 places across West Sussex, large and small. We also work in Portsmouth, around 13 miles away.
Jobs for external mastic in PO20 works the same way as everywhere else we cover. Donnington sits on or near the B2201. Neighbouring places we cover for external mastic include Hunston (1 mile east), North Mundham (1 mile east), Runcton (2 miles east), Chichester (2 miles north) and Portfield (2 miles north-east). We also work in nearby towns such as Bognor Regis (5 miles east), Selsey (5 miles south), Littlehampton (11 miles east), Emsworth (7 miles north-west), Rustington (12 miles east) and Angmering (14 miles east).
What’s near Donnington
Locally, jobs take us to homes and businesses close to The Blacksmith's Arms Public House and the streets around them. The closest station to Donnington is Chichester station, roughly 1.6 miles north of the centre. Other landmarks nearby include Chichester Cathedral Treasury (1.8 miles north) and St Richard's Hospital (2.5 miles north). Not far away are Nutborne Marshes.
The process
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a small place like Donnington, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before work begins.
Related advice
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- Any mould that needs treating
- Working hours on commercial sites
- The old material and how stubborn it is
- The number and length of the joints
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or email us and we’ll talk you through it.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If someone has resealed it before
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Roughly how big the job is
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
What happens if it’s left?
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 problem grows beyond the joint itself. Around Donnington, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Donnington customers choose us
- We never seal over old sealant
- 180+ five-star Google reviews
- Experience in homes, commercial sites and hotels
- An ARBOMaster approved applicator
Take a look at what affects the cost or what customers say.
What we’re called out for in Donnington
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Signs it’s time to call us include:
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
For site and facilities teams at buildings such as Chichester High School For Girls, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- How the surfaces are prepared before sealing
- How much experience the applicator has
- Which colour the sealant will be
- How long to leave it before use
Surface by surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one before sealing.
Questions from Donnington
Will you come out to Donnington?
Yes. Donnington is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is external mastic in a coastal place like Donnington any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can landlords and businesses book you?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across West Sussex.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Can a movement joint be filled with mortar?
No. Rigid materials cannot move with the wall and the joint fails. If it has already been filled, we can generally cut it out and reseal it.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.