Greater London · England
External & façade joints in Farthing Street, Greater London
Problem with your movement joints in Farthing Street? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Panel joints letting water in
- Damp patches traced to an open external joint
- Movement joints filled with mortar instead of sealant
External mastic for homes and businesses in Farthing Street
For buildings in Farthing Street, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on concrete & block, joints between brick and frames and render & cladding joints, and people most often call us about moss and dirt in joints with no sealant left and old sealant gone brittle and cracked.
Outside work in London starts with access: side passages, upper floors and where to park. In Farthing Street, joints up high may need ladders or other access, which is worth talking through when you book.
Big or small, it’s backed by our one-year guarantee in Farthing Street and across Greater London.
- Where
- Farthing Street (BR6)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Places near Farthing Street
More services for Farthing Street
Farthing Street questions
I let a flat near Orpington station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Is parking a problem for a job in Farthing Street?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
How do you reach high-level joints?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
What is a movement joint?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
How much does external mastic cost in Farthing Street?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Surface by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- The product the joint needs
- The number and length of the joints
- How many areas need sealing
- Access and height
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
When you call or email, these details help:
- Whether it’s a home or a business
- Where the property is
- The rough size of the job
- Photos by email, if that’s easy
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
How it works
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the building. For a job in Farthing Street, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- 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.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
Get a quote
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Related advice
What we are called out for in Farthing Street
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Signs it’s time to call us include:
- Leaking joints around cladding and façade panels
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Joints where the bead has come unstuck
For site and facilities teams at buildings such as Downe Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- When the joint can take water or movement
- How the surfaces are prepared before sealing
- Whether VAT is included
- Who does the work, and how experienced they are
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Why us?
- Rated 4.9 stars on Google
- An ARBOMaster approved applicator
- We never seal over old sealant
- We leave the area clean and tidy
Read what affects the cost or customer reviews.
What sealant work can’t fix
We won’t take on work that will not last, so these are the limits:
- 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
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
Farthing Street buildings and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Down House (about 1 mile south) nearby, there’s older building stock in the area around Farthing Street as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Farthing Street is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near St Mary's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Farthing Street is about 4 miles south-west of Orpington, in Greater London. We carry out external mastic for homes and businesses in Farthing Street, as part of our work across Greater London. Our Greater London coverage runs to 764 places, Farthing Street among them. For nearby work, see our London page.
We cover every part of BR6 for external mastic and the streets around it. If you need external mastic at a property on Farthing Street, New Road Hill and Orange Court Lane or anywhere close by, our applicators can take on the job. Nearby, we also carry out external mastic in Downe (1 mile south-east), Leaves Green (1 mile south-west), Hazelwood (1 mile south-east), Keston (1 mile north-west) and Farnborough (1 mile north-east). Further out, we also cover London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (14 miles north-west).
Near you in Farthing Street
Around Farthing Street, our work takes us to homes and buildings near Darrick Wood School, South Park and The Queens Head pub, among other places. For rail, the closest station is Orpington station, about 2.6 miles north-east of the centre. Other landmarks nearby include Princess Royal University Hospital (1.4 miles north) and Crofton Roman Villa (2.5 miles north-east). The countryside around Farthing Street includes Betsom's Hill and West Kent Golf Course nature reserve.