Kent · England
External Mastic in Eynsford
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Eynsford and across Kent. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Panel joints letting water in
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
About our external mastic in Eynsford
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We’re often asked to deal with joints where the bead has come unstuck and water getting into walls through failed joints, on façade panels, brickwork movement joints and render & cladding joints.
Somewhere as small as Eynsford, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. 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 in Eynsford and across Kent.
- Location
- Eynsford (DA4)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need external mastic in Eynsford
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
The problems people normally mention when they call are:
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
If you let a flat or house near Eynsford station, split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- What the cure time is
- Is the old sealant removed completely?
- Who turns up on the day
- How the surfaces are prepared before sealing
What we cannot put right
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
- Movement that’s 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
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Façade panels
Other services in Eynsford
Walls and rooflines in Eynsford
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Lullingstone Castle (about 1 mile south-west) nearby, there’s older building stock in the area around Eynsford as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around Church of Saint Martin, an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like The Anthony Roper Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Eynsford is about 5 miles east of Orpington, in Kent. Jobs in Eynsford get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Kent, we cover 922 places, and Eynsford is one of them. For nearby work, see our London page, about 16 miles away.
Postcode districts we cover here for external mastic: DA4. If you need external mastic at a property on Station Road, High Street and Edwards Court or a nearby road, our applicators can take on the job. If you are just outside Eynsford, we cover Farningham (1 mile north-east), Maplescombe (1 mile south-east), Horton Kirby (2 miles north-east), East Hill (2 miles south-east) and Speed Gate (2 miles east). Within a short drive, we also cover Maidstone (15 miles south-east), Dartford (5 miles north), Sevenoaks (6 miles south), Gravesend (8 miles north-east), Tonbridge (12 miles south) and Northfleet (7 miles north-east).
Landmarks near Eynsford
Typical jobs here are in homes near The Malt Shovel pub, among other places. Eynsford’s nearest station is Eynsford station, roughly 0.5 miles south-west. Nearby you will also find Eynsford Castle (less than half a mile north) and Darenth Park Hospital (5.1 miles north-east). Green spaces nearby include The Warren.
What we do, step by step
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. It generally takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Eynsford, 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.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Move anything stored near the joints
Get a quote
If you are in Eynsford and need external mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Related advice
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the cost of external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- Any working-time requirements on site
- Mould in or behind the old joints
- How easy the joints are to reach
- The old material and how stubborn it is
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
When you call or email, these details help:
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- Where the property is
- How we’d reach the joints
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.
FAQs for Eynsford
Is Eynsford in your area for external mastic?
Yes. We work across London and the South East, and Eynsford is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Do you work for landlords with property near Eynsford station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or drop us an email.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
How do I get a quote for external mastic in Eynsford?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
Why it’s worth doing now in Eynsford
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Around Eynsford, 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’re unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Fully insured
- Homes, businesses and hotels
- Rated 4.9 stars on Google
- Over 20 years’ experience
Read our cost guide or customer reviews.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Point out the joints to other trades
- Make sure movement joints aren’t pointed over
- Get split or bare joints resealed while the damage is small
- Wash walls gently around the sealant
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.