Greater London · England
External Mastic in Bromley Common
Our applicators work in Bromley Common on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
About our external mastic in Bromley Common
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on façade panels, joints between brick and frames and brickwork movement joints, and common reasons people get in touch are rain getting behind render or cladding at a joint and plants rooting in failed movement joints.
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 Bromley Common, it’s worth checking who is responsible for the outside before booking.
Every job comes with a 12-month guarantee.
- Place
- Bromley Common (BR2, BR1)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Bromley Common
Can you do external mastic in Bromley Common?
Yes, Bromley Common is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
Can parking be tricky for a visit in Bromley Common?
Parking in Bromley Common, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
How long before the joint can be used?
Cure times vary by product and the temperature. Before we leave, we will tell you the cure time.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Also near Bromley Common
More services for Bromley Common
How the visit works
There’s no need to move everything out, just the space around the work. Everything nearby is protected, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical job. In Bromley Common, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
How to get a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Advice
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 fails, we can still redo it.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Quotes for external mastic in Bromley Common
For a quick quote, just ask. The main things that affect it are:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- How easy the joints are to reach
- The size of the job
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or email us and we will give you an honest view and a quote.
What we need to know
To help us quote quickly, please include:
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- A few pictures by email, if you can
- Whether it has been sealed before
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Have failed joints looked at early
- Fix overflowing gutters above sealed joints
- Never let anyone fill a movement joint with mortar
- Clear growth from the base of walls and joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
External mastic in Bromley Common: local notes
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Holy Trinity Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. As a London address, Bromley Common can be tricky for parking: let us know about parking bays, permits or a driveway. If you let a flat or house near Bickley station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Bromley Common is about 2 miles south-east of Bromley, in Greater London. Whether you are in the middle of Bromley Common or further out, external mastic is available for homes and businesses alike. Bromley Common is one of 764 places in Greater London we cover for external mastic. We also work in London, around 10 miles away.
Our applicators cover all of the BR2 and BR1 postcode area for external mastic and the streets around it. You will find streets such as Pope Road, Crown Lane and Church Lane. Close by, we work in Southborough (1 mile north-east), Hayes (1 mile south-west), Locksbottom (1 mile south-east), Shortlands (2 miles north-west) and Keston (2 miles south). Further out, we also cover London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Around Bromley Common
Typical jobs here are in homes near Norman Park, The Chequers Public House and Bishop Justus CofE School, among other places. The nearest railway station is Bickley station, about 1.2 miles north of the centre. Well-known places in the area include Bridgeways Day Hospital (within half a mile east) and Bethlem Museum of the Mind (less than half a mile south-west). Not far away are Summer Hill and Downham Woodland Walk.
What we can’t put right
We will always be straight with you, so here’s what sealant can’t fix:
- Subsidence or other structural problems
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
Surfaces we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Concrete & block
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Bromley Common, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why us?
- We agree the colour with you first
- ARBOMaster approved applicator
- A sealant colour to suit the surroundings
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide and our reviews.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Bromley Common and across Greater London. Several sites can be quoted together.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.