Greater London · England
External & façade joints in Lessness Heath, Greater London
Our applicators work in Lessness Heath on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Clear growth from the base of walls and joints
- Keep water from gutters off the wall
- Make sure movement joints are not pointed over
- Point out the joints to other trades
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
External mastic in Lessness Heath, done properly
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it. We work on façade panels, joints between brick and frames and copings & trims, and the jobs we see most are movement joints filled with mortar instead of sealant and joints with sealant missing in places.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. In a converted house in Lessness Heath, it’s worth checking who is responsible for the outside before booking.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Location
- Lessness Heath (DA17, DA8, DA7)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
The work is kept neat and contained to the joints we’re treating. The job generally takes anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. In Lessness Heath, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Let us know about parking restrictions
- Clear the area around the work
- Keep pets and children clear of the area while we work
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or email us.
Related advice
Questions from Lessness Heath
Can parking be tricky for a visit in Lessness Heath?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you work for landlords with property near Belvedere station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Do you come to Lessness Heath?
Yes, we do. Lessness Heath is part of the area we cover.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
Is the work guaranteed?
Yes: twelve months. If anything is not right with the work within the year, let us know and we’ll sort it.
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly where it can be done safely.
Why it’s worth doing now in Lessness Heath
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last, so it pays to do it properly once. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Lessness Heath, the repair is bigger than a sealant job.
What you pay reflects the work, not guesswork. That is why we ask a few questions first.
What you get with us
- Trusted Arbo and Everbuild sealants
- You choose the colour before work begins
- More than 20 years in sealant work
- White, clear, grey or another colour, product permitting
When something else is needed
We will not take on work that will not last, so these are the limits:
- Render that’s blown, hollow or coming away
- Structural movement, which needs a surveyor or engineer
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
Quotes for external mastic in Lessness Heath
We quote each job individually. These are the things that affect it:
- Working hours on commercial sites
- The old material and how stubborn it is
- The product the joint needs
- The number and length of the joints
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Roughly how big the job is
- A few photos by email, if you can
- If someone has resealed it before
- Where the property is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Towns and villages near Lessness Heath
Other services in Lessness Heath
What external mastic looks like in Lessness Heath
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
If you live in an older home near Parish Church of All Saints, older walls, gutters and the joints where extensions meet them need a flexible sealant. If you look after a building such as Lessness Heath Primary School, its movement joints, gutters and trims need looking after like any other building’s. Lessness Heath is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Lessness Heath is about 3 miles east of Plumstead, in Greater London. For external mastic in and around Lessness Heath, please ring 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Greater London. Lessness Heath is one of 764 towns and villages in Greater London where we work. For nearby work, see our London page, about 11 miles away.
We cover every part of the DA17, DA8 and DA7 postcode area for external mastic and the streets around it. That includes homes and businesses on Cray Road, Clive Road and Erith Road. If you’re just outside Lessness Heath, we cover Belvedere (1 mile east), Erith (1 mile south-east), Northumberland Heath (1 mile south-east), West Heath (1 mile south-west) and Bexley Riverside (1 mile south-east). Larger places within reach include London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles west), Kensington (15 miles west), St Pancras (12 miles west) and Shoreditch (10 miles west).
What’s near Lessness Heath
In Lessness Heath, that means homes and buildings near Priory Club pub, Trinity Church of England School and Trinity School, among other places. The closest station to Lessness Heath is Belvedere station, about 0.5 miles north. Other landmarks nearby include Broadway Shopping Centre (2.1 miles south) and Erith and District Hospital (0.9 miles south-east). For a walk, there’s Crossness Nature Reserve.
Can I do it myself?
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.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.