Greater London · England
External & façade joints in Bellingham, Greater London
Problem with your movement joints in Bellingham? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Failed seals between different materials
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
Honest limits
To be straight with you, some problems need a different trade:
- Cracks in the bricks or render themselves, away from the joints
- 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 phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Copings & trims
How we handle external mastic in Bellingham
Movement joints let brickwork, render and cladding expand and shrink without cracking. 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. If you are dealing with sealant that has lost its bond to the brick or render and rain getting behind render or cladding at a joint, we can help.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Bellingham, it’s worth checking who is responsible for the outside before booking.
Whatever the size of the job, you get the same 12-month guarantee in Bellingham and across Greater London.
- Location
- Bellingham (SE6, SE26, SE23)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Bellingham
We work for letting agents and landlords as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Walls and rooflines in Bellingham
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Bellingham can be tricky for parking: let us know about parking bays, permits or a driveway. If you look after a building such as Elfrida Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Bellingham is about 2 miles north of Beckenham, in Greater London. Whether you are in the middle of Bellingham or further out, external mastic is available for homes and businesses alike. Bellingham is one of 764 towns and villages in Greater London we cover. You can also see our page for London, about 6 miles away.
All of SE6, SE26 and SE23 is within our area for external mastic, from the main roads to the quietest streets. Local streets include Oslac Road, Orford Road and Aitken Road. Being close to the A2218, Bellingham is easy for our applicators to reach for external mastic. We also cover the places around Bellingham: Southend (1 mile north), Bell Green (1 mile west), Catford (1 mile north-east), Perry Vale (1 mile west) and Sydenham (1 mile west). Within a short drive, we also cover London (6 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (8 miles north-west) and Shoreditch (7 miles north).
Near you in Bellingham
Locally, jobs take us to homes and businesses close to Sedgehill School, Forster Memorial Park and Allenby Tutorial Trust. There’s a railway station in Bellingham itself: Bellingham station. Nearby you will also find Prefab Museum (1 mile east) and University Hospital Lewisham (1.6 miles north). For a walk, there’s Downham Woodland Walk and Knight's Hill.
Surface by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it so the sealant is not too deep.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Places near Bellingham
Also in Bellingham
The process
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. For a job in Bellingham, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
- Keep pets and children clear of the area while we work
How to get a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.
Advice
When to call us in Bellingham
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Most people get in touch when they notice something like this:
- Rain getting behind render or cladding at a joint
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
In the older streets around St Dunstan, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- How long to leave it before use
- Who does the work, and how experienced they are
- What product goes in the joint
- Whether VAT is included
Questions from Bellingham
Can you help a landlord with a rental near Bellingham station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Is parking an issue for external mastic in Bellingham?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint before we leave.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces, primed where needed.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In a flat in Bellingham, 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.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- Full insurance on every job
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- Tidy, careful work
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.