Kent · England
External Mastic in Greatness
External mastic for Greatness and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Moss and dirt in joints with no sealant left
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours for a handful of joints, longer for a whole elevation. Parking around Greatness is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Let us know about parking restrictions
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
Read more
About our external mastic in Greatness
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. We work on brickwork movement joints, concrete & block and copings & trims, and people most often call us about joints pointed up with cement by mistake and plants rooting in failed movement joints.
Outbuildings, garages and conservatories around homes in places like Greatness add more joints to look after. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
Big or small, it’s backed by our one-year guarantee in Greatness and across Kent.
- Where
- Greatness (TN13, TN14, TN15)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible in all weathers.
Greatness: your questions answered
Can you do external mastic in Greatness?
Yes, Greatness is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Bat & Ball station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Can you reach joints on upper floors?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
Can you do several jobs on one visit?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
What affects the quote in Greatness
We quote each job individually. This is what makes a difference:
- Which sealant suits the joint
- The number and length of the joints
- Whether there’s mould to deal with
- Access and height
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
What to tell us for a quote
When you contact us, it’s useful to know:
- What’s wrong with the joints now
- If someone has resealed it before
- Where the property is
- How we’d reach the joints
We quote each job on its own. Just ring 0345 464 0079 or send us an email with the details, and pictures are welcome.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Point out the joints to other trades
- Ask before painting over external sealant
- Wash walls gently around the sealant
- Have failed joints looked at early
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.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Why it’s worth doing now in Greatness
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Homes in smaller places like Greatness can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why book with us
- We leave the area clean and tidy
- A choice of colours where the product allows
- ARBOMaster approved applicator
- Over 20 years’ experience
Read what affects the cost and what customers say.
Honest limits
Before you book, it’s worth knowing the limits:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
- Walls that need new movement joints cut into them
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Surfaces we seal
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Concrete & block
- Copings & trims
Nearby places to Greatness
Also in Greatness
What external mastic looks like in Greatness
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. Historic houses like Knole House (about 1.7 miles south) are a reminder that the area around Greatness has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around St John the Baptist, older walls, gutters and the joints where extensions meet them need a flexible sealant. Schools such as St John's Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Bat & Ball station, split movement joints are easy to miss on a rental until damp shows inside.
Greatness is about 1 mile north-east of Sevenoaks, in Kent. We carry out external mastic for homes and businesses in Greatness and the surrounding area. Our Kent coverage runs to 922 places, Greatness among them. You can also see our page for London, roughly 19 miles from Greatness.
Work in TN13, TN14 and TN15 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Seal Road, Mill Lane and Sandy Lane or a nearby road, we can help. We also cover the places around Greatness: Seal (1 mile east), Godden Green (2 miles south-east), Styants Bottom (3 miles east), Bitchet Green (3 miles south-east) and Stone Street (3 miles south-east). Further out, we also cover Maidstone (14 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (12 miles north-east), Tonbridge (7 miles south-east) and Northfleet (12 miles north-east).
Local landmarks in Greatness
Typical jobs here are in homes near The Old Bat and Ball pub, Wildernesse School and Knole Academy, among other places. There’s a railway station in Greatness itself: Bat & Ball station. A little further out are Sevenoaks Museum (1.3 miles south) and Kemsing Castle Bank (1.7 miles north-east). The countryside around Greatness includes Dryhill Nature Reserve.
Landlords, agents and businesses in Greatness
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.