Kent · England
External & façade joints in Farningham, Kent
External mastic in Farningham from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed sealant between panels on a façade
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
External mastic in Farningham, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have old sealant gone brittle and cracked and sealant pulling away from one side of the joint, we can put it right, on brickwork movement joints, concrete & block and joints between brick and frames alike.
In a village or hamlet like Farningham, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Farningham (DA4)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. Where a wall is exposed, as many are in small places like Farningham, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why Farningham clients choose us
- You choose the colour before work begins
- White, clear, grey or another colour, product permitting
- Over 20 years’ experience
- Fully insured
Read what affects the cost and our reviews.
Farningham questions
Can you do external mastic in Farningham?
Yes. We work across London and the South East, and Farningham is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Farningham?
Yes. Farningham is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Can you match the colour of my brickwork?
We aim for a joint that suits the wall rather than one that jumps out. We’ll talk through colour options before we start from the range available.
Can landlords and businesses book you?
Yes. We work for householders, landlords, letting agents, businesses and hotels across Kent.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
How long does external mastic take?
That depends on how much there is to do, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We’ll tell you when we quote.
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Whether the work is at height
- The number of rooms or windows
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
The cost depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Helping us quote
Photos help, but a description is a good start. Please mention:
- How we’d reach the joints
- Roughly how big the job is
- Any previous sealing or DIY work
- Where the job is, and your postcode
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building, including the tidy-up. In a small place like Farningham, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Mention any tricky access
- Tell us if parking is tricky
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Related advice
Common problems we fix in Farningham
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Most people get in touch after spotting something like this:
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
In the older streets around Church of Saint Peter and Saint Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- Which colour the sealant will be
- Whether they seal over old material or remove it
- What the cure time is
- Are they insured?
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Get split or bare joints resealed while the damage is small
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Different surfaces, different methods
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Towns and villages near Farningham
More services for Farningham
Outside joints around Farningham
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Lullingstone Castle (about 1.8 miles south-west) nearby, there’s older building stock in the area around Farningham 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.
Rented homes near Eynsford station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as The Anthony Roper Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Farningham is about 5 miles south of Dartford, in Kent. Jobs in Farningham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Kent coverage runs to 922 places, Farningham among them. You can also see our page for London, roughly 16 miles from Farningham.
Here we cover the DA4 postcode area for external mastic. Streets in the area include High Street, London Road and South Hall Close. We also cover the places around Farningham: Eynsford (1 mile south-west), Horton Kirby (1 mile north-east), Maplescombe (2 miles south-east), Speed Gate (2 miles east) and Fawkham Green (3 miles east). Within a short drive, we also cover Maidstone (15 miles south-east), Dartford (5 miles north), Sevenoaks (7 miles south), Gravesend (8 miles north-east), Tonbridge (13 miles south) and Northfleet (7 miles north-east).
Landmarks near Farningham
We work in homes and buildings around Pied Bull pub. Farningham’s nearest station is Eynsford station, roughly 1.4 miles south-west of the centre. Well-known places in the area include Eynsford Castle (0.7 miles south-west) and Darenth Park Hospital (4.2 miles north). Open spaces near Farningham include The Warren.