Kent · England
External Mastic in Seabrook
Professional external mastic in and around Seabrook, with every bit of old sealant taken out first and a 12-month guarantee.
- Failed sealant between panels on a façade
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
External mastic for homes and businesses in Seabrook
Low-level joints can generally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We work on joints between brick and frames, copings & trims and render & cladding joints, and people most often call us about hard, crazed mastic that has stopped moving and rigid filler in a joint that should flex.
Outside joints can only be sealed when they’re dry, so work in Seabrook is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Big or small, you get the same 12-month guarantee in Seabrook and across Kent.
- Place
- Seabrook (CT21, CT20)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
There’s no set price list, because jobs vary so much. What we look at:
- The number of rooms or windows
- How easy the joints are to reach
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
What we need to know
There’s no need for technical detail. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- A few pictures by email, if you can
- Roughly how big the job is
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Walls and rooflines in Seabrook
Seabrook is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Westenhanger Castle (about 4 miles west) are a reminder that the area around Seabrook has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as Seabrook Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Managing a site like Seabrook Church of England Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Seabrook is about 2 miles east of Hythe, in Kent. Across the CT21 area, we cover external mastic for homes and businesses. Seabrook is one of 922 towns and villages in Kent where we work. Our Chelmsford page covers work nearby, about 53 miles away.
Every address in CT21 and CT20 is within our area for external mastic. That includes homes and businesses on Sandy Lane, Spring Lane and Naildown Road. We also cover Sandgate (1 mile east), Newington (1 mile north), Cheriton (1 mile north-east), Hythe (2 miles west) and Peene (2 miles north). Within a short drive, we also cover Ashford (12 miles north-west), Canterbury (14 miles north), Dover (9 miles north-east), Deal (15 miles north-east), Tower Hamlets (9 miles north-east) and Walmer (15 miles north-east).
Landmarks near Seabrook
Locally, jobs take us to homes and businesses close to Oaklands Park, The Folkestone School for Girls and The Fountain pub, among other places. The closest station to Seabrook is Folkestone West station, about 1.7 miles north-east. Other landmarks nearby include Royal Victoria Hospital (2.5 miles east) and Hythe Museum (1.6 miles west). The countryside around Seabrook includes Tolsford Hill.
How it works
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. For a village or hamlet like Seabrook, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- 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.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
Getting a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job and send photos if you have them.
Read more
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 doesn’t work out, we can still put it right.
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. Everything old must be removed first.
Other services in Seabrook
What we cannot put right
A few problems are outside what sealant work can do:
- Cracked brickwork or render that needs a builder or plasterer
- Failed render or damaged cladding panels
- Movement that is more than a sealant joint can take
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Brickwork movement joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
Why act early in Seabrook
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. Around Seabrook, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Why Seabrook clients choose us
- Approved under the ARBOMaster scheme
- Anti-fungal silicone where joints get wet
- Domestic, commercial and hotel work
- Over 20 years’ experience
Different surfaces, different methods
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
Seabrook questions
Is Seabrook within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is external mastic in a coastal place like Seabrook any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you work at height?
That depends on the building and the joints. Where joints can be reached safely, we’ll do them. Tell us about the building and we’ll confirm what access is needed.
I rent my home. Can I book you?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces, primed where needed.
How long before the joint can be used?
Cure times vary by product and the conditions. We tell you how long to leave it before we go.
Signs you need external mastic in Seabrook
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Leaking joints around cladding and façade panels
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
Letting a property close to Folkestone West station? Then split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- Whether the sealant suits the joint
- How long to leave it before use
- Whether you can choose the colour
- Are they insured?