Greater London · England
External & façade joints in Bromley, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Bromley. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
Should I try it myself first?
If you do try it yourself, take your time over the 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.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
How we handle external mastic in Bromley
On houses, flats and commercial buildings across Bromley, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. Typical jobs include leaking joints around cladding and façade panels and joints pointed up with cement by mistake, across copings & trims, façade panels and joints between brick and frames.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Bromley, tell us how high the joints are and how to reach the back of the building.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Bromley (BR2, BR1, BR6, BR5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Different surfaces, different methods
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Tell us what the building has when you get in touch.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Why act early in Bromley
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. In a flat in Bromley, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why Bromley customers choose us
- A sealant colour to suit the surroundings
- 12-month guarantee on every job
- Approved under the ARBOMaster scheme
- Tidy, careful work
Take a look at our cost guide or customer reviews.
What we do, step by step
The work is kept neat and contained to the area we are working on, so you can get on with your day. The job generally takes anything from a few hours to several days, depending on the building. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Getting a quote
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details and send pictures if you have them.
Read more
Your questions about external mastic in Bromley
Can you help a landlord with a rental near Bromley South station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Can parking be tricky for a visit in Bromley?
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.
What does external mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can I add another job to the visit?
Yes. Just list everything you need.
How long does external mastic last?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Walls and rooflines in Bromley
With historic houses such as Bromley Palace (about 0.3 miles east) nearby, there’s older building stock in the area around Bromley 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. 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.
Schools such as St Mark's Church of England Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Peter and St Paul include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Bromley is about 8 miles south-east of London, in Greater London. Whether you are in the middle of Bromley or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Bromley is one of them. You can also see our page for London, about 8 miles away.
Postcode districts we cover here for external mastic: BR2, BR1, BR6 and BR5. We cover properties on High Street, Church Road and St Paul's Square. Bromley sits on or near the A222 and A223, so getting to you is simple. Close by, we work in Sundridge (1 mile north-east), Plaistow (1 mile north), Bickley (1 mile east), Widmore (1 mile east) and Downham (2 miles north). Further out, we also cover London (8 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (12 miles north-west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Landmarks near Bromley
We work in homes and buildings around Bullers Wood School for Boys, The Richmal Crompton pub and Church House Gardens. Bromley has its own railway station: Bromley South station. Nearby you will also find The Mall (within half a mile east) and Bromley Hospital (within half a mile south-east). Not far away are Downham Woodland Walk and Summer Hill.
What else we do in Bromley
Common problems we fix in Bromley
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Common reasons people contact us are:
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
- Hard, crazed mastic that has stopped moving
- Moss and dirt in joints with no sealant left
Bromley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- Are they insured?
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- How hidden problems are handled
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
We also work for property managers and facilities teams in Bromley and across Greater London. We can quote a run of properties together, and we are fully insured for the work.
What affects the quote in Bromley
We do not publish a price list, because no two jobs are the same. What we look at:
- The size of the job
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Helping us quote
To help us quote quickly, let us know:
- Whether it has been sealed before
- Pictures of the joints, sent by email
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.